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1654 lines
43 KiB
1654 lines
43 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright IBM Corporation, 2018 |
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* Authors Suraj Jitindar Singh <[email protected]> |
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* Paul Mackerras <[email protected]> |
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* |
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* Description: KVM functions specific to running nested KVM-HV guests |
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* on Book3S processors (specifically POWER9 and later). |
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*/ |
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|
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#include <linux/kernel.h> |
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#include <linux/kvm_host.h> |
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#include <linux/llist.h> |
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#include <linux/pgtable.h> |
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|
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#include <asm/kvm_ppc.h> |
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#include <asm/kvm_book3s.h> |
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#include <asm/mmu.h> |
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#include <asm/pgalloc.h> |
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#include <asm/pte-walk.h> |
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#include <asm/reg.h> |
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#include <asm/plpar_wrappers.h> |
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|
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static struct patb_entry *pseries_partition_tb; |
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|
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static void kvmhv_update_ptbl_cache(struct kvm_nested_guest *gp); |
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static void kvmhv_free_memslot_nest_rmap(struct kvm_memory_slot *free); |
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|
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void kvmhv_save_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr) |
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{ |
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struct kvmppc_vcore *vc = vcpu->arch.vcore; |
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|
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hr->pcr = vc->pcr | PCR_MASK; |
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hr->dpdes = vc->dpdes; |
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hr->hfscr = vcpu->arch.hfscr; |
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hr->tb_offset = vc->tb_offset; |
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hr->dawr0 = vcpu->arch.dawr0; |
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hr->dawrx0 = vcpu->arch.dawrx0; |
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hr->ciabr = vcpu->arch.ciabr; |
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hr->purr = vcpu->arch.purr; |
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hr->spurr = vcpu->arch.spurr; |
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hr->ic = vcpu->arch.ic; |
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hr->vtb = vc->vtb; |
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hr->srr0 = vcpu->arch.shregs.srr0; |
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hr->srr1 = vcpu->arch.shregs.srr1; |
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hr->sprg[0] = vcpu->arch.shregs.sprg0; |
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hr->sprg[1] = vcpu->arch.shregs.sprg1; |
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hr->sprg[2] = vcpu->arch.shregs.sprg2; |
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hr->sprg[3] = vcpu->arch.shregs.sprg3; |
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hr->pidr = vcpu->arch.pid; |
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hr->cfar = vcpu->arch.cfar; |
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hr->ppr = vcpu->arch.ppr; |
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hr->dawr1 = vcpu->arch.dawr1; |
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hr->dawrx1 = vcpu->arch.dawrx1; |
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} |
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|
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/* Use noinline_for_stack due to https://bugs.llvm.org/show_bug.cgi?id=49610 */ |
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static noinline_for_stack void byteswap_pt_regs(struct pt_regs *regs) |
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{ |
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unsigned long *addr = (unsigned long *) regs; |
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|
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for (; addr < ((unsigned long *) (regs + 1)); addr++) |
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*addr = swab64(*addr); |
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} |
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|
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static void byteswap_hv_regs(struct hv_guest_state *hr) |
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{ |
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hr->version = swab64(hr->version); |
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hr->lpid = swab32(hr->lpid); |
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hr->vcpu_token = swab32(hr->vcpu_token); |
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hr->lpcr = swab64(hr->lpcr); |
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hr->pcr = swab64(hr->pcr) | PCR_MASK; |
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hr->amor = swab64(hr->amor); |
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hr->dpdes = swab64(hr->dpdes); |
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hr->hfscr = swab64(hr->hfscr); |
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hr->tb_offset = swab64(hr->tb_offset); |
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hr->dawr0 = swab64(hr->dawr0); |
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hr->dawrx0 = swab64(hr->dawrx0); |
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hr->ciabr = swab64(hr->ciabr); |
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hr->hdec_expiry = swab64(hr->hdec_expiry); |
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hr->purr = swab64(hr->purr); |
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hr->spurr = swab64(hr->spurr); |
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hr->ic = swab64(hr->ic); |
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hr->vtb = swab64(hr->vtb); |
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hr->hdar = swab64(hr->hdar); |
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hr->hdsisr = swab64(hr->hdsisr); |
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hr->heir = swab64(hr->heir); |
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hr->asdr = swab64(hr->asdr); |
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hr->srr0 = swab64(hr->srr0); |
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hr->srr1 = swab64(hr->srr1); |
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hr->sprg[0] = swab64(hr->sprg[0]); |
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hr->sprg[1] = swab64(hr->sprg[1]); |
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hr->sprg[2] = swab64(hr->sprg[2]); |
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hr->sprg[3] = swab64(hr->sprg[3]); |
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hr->pidr = swab64(hr->pidr); |
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hr->cfar = swab64(hr->cfar); |
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hr->ppr = swab64(hr->ppr); |
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hr->dawr1 = swab64(hr->dawr1); |
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hr->dawrx1 = swab64(hr->dawrx1); |
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} |
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static void save_hv_return_state(struct kvm_vcpu *vcpu, int trap, |
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struct hv_guest_state *hr) |
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{ |
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struct kvmppc_vcore *vc = vcpu->arch.vcore; |
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|
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hr->dpdes = vc->dpdes; |
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hr->hfscr = vcpu->arch.hfscr; |
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hr->purr = vcpu->arch.purr; |
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hr->spurr = vcpu->arch.spurr; |
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hr->ic = vcpu->arch.ic; |
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hr->vtb = vc->vtb; |
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hr->srr0 = vcpu->arch.shregs.srr0; |
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hr->srr1 = vcpu->arch.shregs.srr1; |
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hr->sprg[0] = vcpu->arch.shregs.sprg0; |
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hr->sprg[1] = vcpu->arch.shregs.sprg1; |
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hr->sprg[2] = vcpu->arch.shregs.sprg2; |
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hr->sprg[3] = vcpu->arch.shregs.sprg3; |
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hr->pidr = vcpu->arch.pid; |
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hr->cfar = vcpu->arch.cfar; |
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hr->ppr = vcpu->arch.ppr; |
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switch (trap) { |
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case BOOK3S_INTERRUPT_H_DATA_STORAGE: |
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hr->hdar = vcpu->arch.fault_dar; |
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hr->hdsisr = vcpu->arch.fault_dsisr; |
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hr->asdr = vcpu->arch.fault_gpa; |
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break; |
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case BOOK3S_INTERRUPT_H_INST_STORAGE: |
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hr->asdr = vcpu->arch.fault_gpa; |
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break; |
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case BOOK3S_INTERRUPT_H_EMUL_ASSIST: |
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hr->heir = vcpu->arch.emul_inst; |
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break; |
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} |
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} |
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/* |
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* This can result in some L0 HV register state being leaked to an L1 |
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* hypervisor when the hv_guest_state is copied back to the guest after |
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* being modified here. |
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* |
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* There is no known problem with such a leak, and in many cases these |
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* register settings could be derived by the guest by observing behaviour |
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* and timing, interrupts, etc., but it is an issue to consider. |
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*/ |
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static void sanitise_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr) |
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{ |
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struct kvmppc_vcore *vc = vcpu->arch.vcore; |
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u64 mask; |
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|
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/* |
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* Don't let L1 change LPCR bits for the L2 except these: |
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*/ |
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mask = LPCR_DPFD | LPCR_ILE | LPCR_TC | LPCR_AIL | LPCR_LD | |
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LPCR_LPES | LPCR_MER; |
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|
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/* |
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* Additional filtering is required depending on hardware |
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* and configuration. |
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*/ |
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hr->lpcr = kvmppc_filter_lpcr_hv(vcpu->kvm, |
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(vc->lpcr & ~mask) | (hr->lpcr & mask)); |
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|
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/* |
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* Don't let L1 enable features for L2 which we've disabled for L1, |
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* but preserve the interrupt cause field. |
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*/ |
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hr->hfscr &= (HFSCR_INTR_CAUSE | vcpu->arch.hfscr); |
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|
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/* Don't let data address watchpoint match in hypervisor state */ |
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hr->dawrx0 &= ~DAWRX_HYP; |
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hr->dawrx1 &= ~DAWRX_HYP; |
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/* Don't let completed instruction address breakpt match in HV state */ |
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if ((hr->ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER) |
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hr->ciabr &= ~CIABR_PRIV; |
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} |
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static void restore_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr) |
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{ |
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struct kvmppc_vcore *vc = vcpu->arch.vcore; |
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vc->pcr = hr->pcr | PCR_MASK; |
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vc->dpdes = hr->dpdes; |
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vcpu->arch.hfscr = hr->hfscr; |
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vcpu->arch.dawr0 = hr->dawr0; |
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vcpu->arch.dawrx0 = hr->dawrx0; |
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vcpu->arch.ciabr = hr->ciabr; |
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vcpu->arch.purr = hr->purr; |
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vcpu->arch.spurr = hr->spurr; |
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vcpu->arch.ic = hr->ic; |
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vc->vtb = hr->vtb; |
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vcpu->arch.shregs.srr0 = hr->srr0; |
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vcpu->arch.shregs.srr1 = hr->srr1; |
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vcpu->arch.shregs.sprg0 = hr->sprg[0]; |
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vcpu->arch.shregs.sprg1 = hr->sprg[1]; |
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vcpu->arch.shregs.sprg2 = hr->sprg[2]; |
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vcpu->arch.shregs.sprg3 = hr->sprg[3]; |
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vcpu->arch.pid = hr->pidr; |
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vcpu->arch.cfar = hr->cfar; |
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vcpu->arch.ppr = hr->ppr; |
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vcpu->arch.dawr1 = hr->dawr1; |
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vcpu->arch.dawrx1 = hr->dawrx1; |
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} |
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void kvmhv_restore_hv_return_state(struct kvm_vcpu *vcpu, |
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struct hv_guest_state *hr) |
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{ |
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struct kvmppc_vcore *vc = vcpu->arch.vcore; |
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vc->dpdes = hr->dpdes; |
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vcpu->arch.hfscr = hr->hfscr; |
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vcpu->arch.purr = hr->purr; |
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vcpu->arch.spurr = hr->spurr; |
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vcpu->arch.ic = hr->ic; |
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vc->vtb = hr->vtb; |
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vcpu->arch.fault_dar = hr->hdar; |
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vcpu->arch.fault_dsisr = hr->hdsisr; |
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vcpu->arch.fault_gpa = hr->asdr; |
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vcpu->arch.emul_inst = hr->heir; |
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vcpu->arch.shregs.srr0 = hr->srr0; |
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vcpu->arch.shregs.srr1 = hr->srr1; |
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vcpu->arch.shregs.sprg0 = hr->sprg[0]; |
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vcpu->arch.shregs.sprg1 = hr->sprg[1]; |
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vcpu->arch.shregs.sprg2 = hr->sprg[2]; |
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vcpu->arch.shregs.sprg3 = hr->sprg[3]; |
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vcpu->arch.pid = hr->pidr; |
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vcpu->arch.cfar = hr->cfar; |
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vcpu->arch.ppr = hr->ppr; |
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} |
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static void kvmhv_nested_mmio_needed(struct kvm_vcpu *vcpu, u64 regs_ptr) |
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{ |
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/* No need to reflect the page fault to L1, we've handled it */ |
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vcpu->arch.trap = 0; |
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/* |
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* Since the L2 gprs have already been written back into L1 memory when |
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* we complete the mmio, store the L1 memory location of the L2 gpr |
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* being loaded into by the mmio so that the loaded value can be |
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* written there in kvmppc_complete_mmio_load() |
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*/ |
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if (((vcpu->arch.io_gpr & KVM_MMIO_REG_EXT_MASK) == KVM_MMIO_REG_GPR) |
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&& (vcpu->mmio_is_write == 0)) { |
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vcpu->arch.nested_io_gpr = (gpa_t) regs_ptr + |
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offsetof(struct pt_regs, |
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gpr[vcpu->arch.io_gpr]); |
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vcpu->arch.io_gpr = KVM_MMIO_REG_NESTED_GPR; |
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} |
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} |
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static int kvmhv_read_guest_state_and_regs(struct kvm_vcpu *vcpu, |
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struct hv_guest_state *l2_hv, |
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struct pt_regs *l2_regs, |
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u64 hv_ptr, u64 regs_ptr) |
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{ |
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int size; |
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if (kvm_vcpu_read_guest(vcpu, hv_ptr, &l2_hv->version, |
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sizeof(l2_hv->version))) |
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return -1; |
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if (kvmppc_need_byteswap(vcpu)) |
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l2_hv->version = swab64(l2_hv->version); |
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size = hv_guest_state_size(l2_hv->version); |
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if (size < 0) |
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return -1; |
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return kvm_vcpu_read_guest(vcpu, hv_ptr, l2_hv, size) || |
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kvm_vcpu_read_guest(vcpu, regs_ptr, l2_regs, |
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sizeof(struct pt_regs)); |
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} |
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static int kvmhv_write_guest_state_and_regs(struct kvm_vcpu *vcpu, |
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struct hv_guest_state *l2_hv, |
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struct pt_regs *l2_regs, |
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u64 hv_ptr, u64 regs_ptr) |
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{ |
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int size; |
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size = hv_guest_state_size(l2_hv->version); |
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if (size < 0) |
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return -1; |
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return kvm_vcpu_write_guest(vcpu, hv_ptr, l2_hv, size) || |
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kvm_vcpu_write_guest(vcpu, regs_ptr, l2_regs, |
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sizeof(struct pt_regs)); |
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} |
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long kvmhv_enter_nested_guest(struct kvm_vcpu *vcpu) |
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{ |
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long int err, r; |
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struct kvm_nested_guest *l2; |
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struct pt_regs l2_regs, saved_l1_regs; |
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struct hv_guest_state l2_hv = {0}, saved_l1_hv; |
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struct kvmppc_vcore *vc = vcpu->arch.vcore; |
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u64 hv_ptr, regs_ptr; |
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u64 hdec_exp; |
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s64 delta_purr, delta_spurr, delta_ic, delta_vtb; |
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if (vcpu->kvm->arch.l1_ptcr == 0) |
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return H_NOT_AVAILABLE; |
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/* copy parameters in */ |
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hv_ptr = kvmppc_get_gpr(vcpu, 4); |
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regs_ptr = kvmppc_get_gpr(vcpu, 5); |
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vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); |
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err = kvmhv_read_guest_state_and_regs(vcpu, &l2_hv, &l2_regs, |
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hv_ptr, regs_ptr); |
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srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); |
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if (err) |
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return H_PARAMETER; |
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if (kvmppc_need_byteswap(vcpu)) |
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byteswap_hv_regs(&l2_hv); |
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if (l2_hv.version > HV_GUEST_STATE_VERSION) |
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return H_P2; |
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if (kvmppc_need_byteswap(vcpu)) |
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byteswap_pt_regs(&l2_regs); |
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if (l2_hv.vcpu_token >= NR_CPUS) |
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return H_PARAMETER; |
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/* translate lpid */ |
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l2 = kvmhv_get_nested(vcpu->kvm, l2_hv.lpid, true); |
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if (!l2) |
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return H_PARAMETER; |
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if (!l2->l1_gr_to_hr) { |
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mutex_lock(&l2->tlb_lock); |
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kvmhv_update_ptbl_cache(l2); |
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mutex_unlock(&l2->tlb_lock); |
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} |
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/* save l1 values of things */ |
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vcpu->arch.regs.msr = vcpu->arch.shregs.msr; |
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saved_l1_regs = vcpu->arch.regs; |
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kvmhv_save_hv_regs(vcpu, &saved_l1_hv); |
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|
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/* convert TB values/offsets to host (L0) values */ |
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hdec_exp = l2_hv.hdec_expiry - vc->tb_offset; |
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vc->tb_offset += l2_hv.tb_offset; |
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|
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/* set L1 state to L2 state */ |
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vcpu->arch.nested = l2; |
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vcpu->arch.nested_vcpu_id = l2_hv.vcpu_token; |
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vcpu->arch.regs = l2_regs; |
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/* Guest must always run with ME enabled, HV disabled. */ |
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vcpu->arch.shregs.msr = (vcpu->arch.regs.msr | MSR_ME) & ~MSR_HV; |
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sanitise_hv_regs(vcpu, &l2_hv); |
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restore_hv_regs(vcpu, &l2_hv); |
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vcpu->arch.ret = RESUME_GUEST; |
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vcpu->arch.trap = 0; |
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do { |
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if (mftb() >= hdec_exp) { |
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vcpu->arch.trap = BOOK3S_INTERRUPT_HV_DECREMENTER; |
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r = RESUME_HOST; |
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break; |
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} |
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r = kvmhv_run_single_vcpu(vcpu, hdec_exp, l2_hv.lpcr); |
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} while (is_kvmppc_resume_guest(r)); |
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|
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/* save L2 state for return */ |
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l2_regs = vcpu->arch.regs; |
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l2_regs.msr = vcpu->arch.shregs.msr; |
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delta_purr = vcpu->arch.purr - l2_hv.purr; |
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delta_spurr = vcpu->arch.spurr - l2_hv.spurr; |
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delta_ic = vcpu->arch.ic - l2_hv.ic; |
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delta_vtb = vc->vtb - l2_hv.vtb; |
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save_hv_return_state(vcpu, vcpu->arch.trap, &l2_hv); |
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|
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/* restore L1 state */ |
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vcpu->arch.nested = NULL; |
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vcpu->arch.regs = saved_l1_regs; |
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vcpu->arch.shregs.msr = saved_l1_regs.msr & ~MSR_TS_MASK; |
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/* set L1 MSR TS field according to L2 transaction state */ |
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if (l2_regs.msr & MSR_TS_MASK) |
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vcpu->arch.shregs.msr |= MSR_TS_S; |
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vc->tb_offset = saved_l1_hv.tb_offset; |
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restore_hv_regs(vcpu, &saved_l1_hv); |
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vcpu->arch.purr += delta_purr; |
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vcpu->arch.spurr += delta_spurr; |
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vcpu->arch.ic += delta_ic; |
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vc->vtb += delta_vtb; |
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|
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kvmhv_put_nested(l2); |
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|
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/* copy l2_hv_state and regs back to guest */ |
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if (kvmppc_need_byteswap(vcpu)) { |
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byteswap_hv_regs(&l2_hv); |
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byteswap_pt_regs(&l2_regs); |
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} |
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vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); |
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err = kvmhv_write_guest_state_and_regs(vcpu, &l2_hv, &l2_regs, |
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hv_ptr, regs_ptr); |
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srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); |
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if (err) |
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return H_AUTHORITY; |
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|
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if (r == -EINTR) |
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return H_INTERRUPT; |
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|
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if (vcpu->mmio_needed) { |
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kvmhv_nested_mmio_needed(vcpu, regs_ptr); |
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return H_TOO_HARD; |
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} |
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|
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return vcpu->arch.trap; |
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} |
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|
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long kvmhv_nested_init(void) |
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{ |
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long int ptb_order; |
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unsigned long ptcr; |
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long rc; |
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|
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if (!kvmhv_on_pseries()) |
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return 0; |
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if (!radix_enabled()) |
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return -ENODEV; |
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|
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/* find log base 2 of KVMPPC_NR_LPIDS, rounding up */ |
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ptb_order = __ilog2(KVMPPC_NR_LPIDS - 1) + 1; |
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if (ptb_order < 8) |
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ptb_order = 8; |
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pseries_partition_tb = kmalloc(sizeof(struct patb_entry) << ptb_order, |
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GFP_KERNEL); |
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if (!pseries_partition_tb) { |
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pr_err("kvm-hv: failed to allocated nested partition table\n"); |
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return -ENOMEM; |
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} |
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|
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ptcr = __pa(pseries_partition_tb) | (ptb_order - 8); |
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rc = plpar_hcall_norets(H_SET_PARTITION_TABLE, ptcr); |
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if (rc != H_SUCCESS) { |
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pr_err("kvm-hv: Parent hypervisor does not support nesting (rc=%ld)\n", |
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rc); |
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kfree(pseries_partition_tb); |
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pseries_partition_tb = NULL; |
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return -ENODEV; |
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} |
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|
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return 0; |
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} |
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|
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void kvmhv_nested_exit(void) |
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{ |
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/* |
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* N.B. the kvmhv_on_pseries() test is there because it enables |
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* the compiler to remove the call to plpar_hcall_norets() |
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* when CONFIG_PPC_PSERIES=n. |
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*/ |
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if (kvmhv_on_pseries() && pseries_partition_tb) { |
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plpar_hcall_norets(H_SET_PARTITION_TABLE, 0); |
|
kfree(pseries_partition_tb); |
|
pseries_partition_tb = NULL; |
|
} |
|
} |
|
|
|
static void kvmhv_flush_lpid(unsigned int lpid) |
|
{ |
|
long rc; |
|
|
|
if (!kvmhv_on_pseries()) { |
|
radix__flush_all_lpid(lpid); |
|
return; |
|
} |
|
|
|
if (!firmware_has_feature(FW_FEATURE_RPT_INVALIDATE)) |
|
rc = plpar_hcall_norets(H_TLB_INVALIDATE, H_TLBIE_P1_ENC(2, 0, 1), |
|
lpid, TLBIEL_INVAL_SET_LPID); |
|
else |
|
rc = pseries_rpt_invalidate(lpid, H_RPTI_TARGET_CMMU, |
|
H_RPTI_TYPE_NESTED | |
|
H_RPTI_TYPE_TLB | H_RPTI_TYPE_PWC | |
|
H_RPTI_TYPE_PAT, |
|
H_RPTI_PAGE_ALL, 0, -1UL); |
|
if (rc) |
|
pr_err("KVM: TLB LPID invalidation hcall failed, rc=%ld\n", rc); |
|
} |
|
|
|
void kvmhv_set_ptbl_entry(unsigned int lpid, u64 dw0, u64 dw1) |
|
{ |
|
if (!kvmhv_on_pseries()) { |
|
mmu_partition_table_set_entry(lpid, dw0, dw1, true); |
|
return; |
|
} |
|
|
|
pseries_partition_tb[lpid].patb0 = cpu_to_be64(dw0); |
|
pseries_partition_tb[lpid].patb1 = cpu_to_be64(dw1); |
|
/* L0 will do the necessary barriers */ |
|
kvmhv_flush_lpid(lpid); |
|
} |
|
|
|
static void kvmhv_set_nested_ptbl(struct kvm_nested_guest *gp) |
|
{ |
|
unsigned long dw0; |
|
|
|
dw0 = PATB_HR | radix__get_tree_size() | |
|
__pa(gp->shadow_pgtable) | RADIX_PGD_INDEX_SIZE; |
|
kvmhv_set_ptbl_entry(gp->shadow_lpid, dw0, gp->process_table); |
|
} |
|
|
|
void kvmhv_vm_nested_init(struct kvm *kvm) |
|
{ |
|
kvm->arch.max_nested_lpid = -1; |
|
} |
|
|
|
/* |
|
* Handle the H_SET_PARTITION_TABLE hcall. |
|
* r4 = guest real address of partition table + log_2(size) - 12 |
|
* (formatted as for the PTCR). |
|
*/ |
|
long kvmhv_set_partition_table(struct kvm_vcpu *vcpu) |
|
{ |
|
struct kvm *kvm = vcpu->kvm; |
|
unsigned long ptcr = kvmppc_get_gpr(vcpu, 4); |
|
int srcu_idx; |
|
long ret = H_SUCCESS; |
|
|
|
srcu_idx = srcu_read_lock(&kvm->srcu); |
|
/* |
|
* Limit the partition table to 4096 entries (because that's what |
|
* hardware supports), and check the base address. |
|
*/ |
|
if ((ptcr & PRTS_MASK) > 12 - 8 || |
|
!kvm_is_visible_gfn(vcpu->kvm, (ptcr & PRTB_MASK) >> PAGE_SHIFT)) |
|
ret = H_PARAMETER; |
|
srcu_read_unlock(&kvm->srcu, srcu_idx); |
|
if (ret == H_SUCCESS) |
|
kvm->arch.l1_ptcr = ptcr; |
|
return ret; |
|
} |
|
|
|
/* |
|
* Handle the H_COPY_TOFROM_GUEST hcall. |
|
* r4 = L1 lpid of nested guest |
|
* r5 = pid |
|
* r6 = eaddr to access |
|
* r7 = to buffer (L1 gpa) |
|
* r8 = from buffer (L1 gpa) |
|
* r9 = n bytes to copy |
|
*/ |
|
long kvmhv_copy_tofrom_guest_nested(struct kvm_vcpu *vcpu) |
|
{ |
|
struct kvm_nested_guest *gp; |
|
int l1_lpid = kvmppc_get_gpr(vcpu, 4); |
|
int pid = kvmppc_get_gpr(vcpu, 5); |
|
gva_t eaddr = kvmppc_get_gpr(vcpu, 6); |
|
gpa_t gp_to = (gpa_t) kvmppc_get_gpr(vcpu, 7); |
|
gpa_t gp_from = (gpa_t) kvmppc_get_gpr(vcpu, 8); |
|
void *buf; |
|
unsigned long n = kvmppc_get_gpr(vcpu, 9); |
|
bool is_load = !!gp_to; |
|
long rc; |
|
|
|
if (gp_to && gp_from) /* One must be NULL to determine the direction */ |
|
return H_PARAMETER; |
|
|
|
if (eaddr & (0xFFFUL << 52)) |
|
return H_PARAMETER; |
|
|
|
buf = kzalloc(n, GFP_KERNEL); |
|
if (!buf) |
|
return H_NO_MEM; |
|
|
|
gp = kvmhv_get_nested(vcpu->kvm, l1_lpid, false); |
|
if (!gp) { |
|
rc = H_PARAMETER; |
|
goto out_free; |
|
} |
|
|
|
mutex_lock(&gp->tlb_lock); |
|
|
|
if (is_load) { |
|
/* Load from the nested guest into our buffer */ |
|
rc = __kvmhv_copy_tofrom_guest_radix(gp->shadow_lpid, pid, |
|
eaddr, buf, NULL, n); |
|
if (rc) |
|
goto not_found; |
|
|
|
/* Write what was loaded into our buffer back to the L1 guest */ |
|
vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); |
|
rc = kvm_vcpu_write_guest(vcpu, gp_to, buf, n); |
|
srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); |
|
if (rc) |
|
goto not_found; |
|
} else { |
|
/* Load the data to be stored from the L1 guest into our buf */ |
|
vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); |
|
rc = kvm_vcpu_read_guest(vcpu, gp_from, buf, n); |
|
srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); |
|
if (rc) |
|
goto not_found; |
|
|
|
/* Store from our buffer into the nested guest */ |
|
rc = __kvmhv_copy_tofrom_guest_radix(gp->shadow_lpid, pid, |
|
eaddr, NULL, buf, n); |
|
if (rc) |
|
goto not_found; |
|
} |
|
|
|
out_unlock: |
|
mutex_unlock(&gp->tlb_lock); |
|
kvmhv_put_nested(gp); |
|
out_free: |
|
kfree(buf); |
|
return rc; |
|
not_found: |
|
rc = H_NOT_FOUND; |
|
goto out_unlock; |
|
} |
|
|
|
/* |
|
* Reload the partition table entry for a guest. |
|
* Caller must hold gp->tlb_lock. |
|
*/ |
|
static void kvmhv_update_ptbl_cache(struct kvm_nested_guest *gp) |
|
{ |
|
int ret; |
|
struct patb_entry ptbl_entry; |
|
unsigned long ptbl_addr; |
|
struct kvm *kvm = gp->l1_host; |
|
|
|
ret = -EFAULT; |
|
ptbl_addr = (kvm->arch.l1_ptcr & PRTB_MASK) + (gp->l1_lpid << 4); |
|
if (gp->l1_lpid < (1ul << ((kvm->arch.l1_ptcr & PRTS_MASK) + 8))) { |
|
int srcu_idx = srcu_read_lock(&kvm->srcu); |
|
ret = kvm_read_guest(kvm, ptbl_addr, |
|
&ptbl_entry, sizeof(ptbl_entry)); |
|
srcu_read_unlock(&kvm->srcu, srcu_idx); |
|
} |
|
if (ret) { |
|
gp->l1_gr_to_hr = 0; |
|
gp->process_table = 0; |
|
} else { |
|
gp->l1_gr_to_hr = be64_to_cpu(ptbl_entry.patb0); |
|
gp->process_table = be64_to_cpu(ptbl_entry.patb1); |
|
} |
|
kvmhv_set_nested_ptbl(gp); |
|
} |
|
|
|
static struct kvm_nested_guest *kvmhv_alloc_nested(struct kvm *kvm, unsigned int lpid) |
|
{ |
|
struct kvm_nested_guest *gp; |
|
long shadow_lpid; |
|
|
|
gp = kzalloc(sizeof(*gp), GFP_KERNEL); |
|
if (!gp) |
|
return NULL; |
|
gp->l1_host = kvm; |
|
gp->l1_lpid = lpid; |
|
mutex_init(&gp->tlb_lock); |
|
gp->shadow_pgtable = pgd_alloc(kvm->mm); |
|
if (!gp->shadow_pgtable) |
|
goto out_free; |
|
shadow_lpid = kvmppc_alloc_lpid(); |
|
if (shadow_lpid < 0) |
|
goto out_free2; |
|
gp->shadow_lpid = shadow_lpid; |
|
gp->radix = 1; |
|
|
|
memset(gp->prev_cpu, -1, sizeof(gp->prev_cpu)); |
|
|
|
return gp; |
|
|
|
out_free2: |
|
pgd_free(kvm->mm, gp->shadow_pgtable); |
|
out_free: |
|
kfree(gp); |
|
return NULL; |
|
} |
|
|
|
/* |
|
* Free up any resources allocated for a nested guest. |
|
*/ |
|
static void kvmhv_release_nested(struct kvm_nested_guest *gp) |
|
{ |
|
struct kvm *kvm = gp->l1_host; |
|
|
|
if (gp->shadow_pgtable) { |
|
/* |
|
* No vcpu is using this struct and no call to |
|
* kvmhv_get_nested can find this struct, |
|
* so we don't need to hold kvm->mmu_lock. |
|
*/ |
|
kvmppc_free_pgtable_radix(kvm, gp->shadow_pgtable, |
|
gp->shadow_lpid); |
|
pgd_free(kvm->mm, gp->shadow_pgtable); |
|
} |
|
kvmhv_set_ptbl_entry(gp->shadow_lpid, 0, 0); |
|
kvmppc_free_lpid(gp->shadow_lpid); |
|
kfree(gp); |
|
} |
|
|
|
static void kvmhv_remove_nested(struct kvm_nested_guest *gp) |
|
{ |
|
struct kvm *kvm = gp->l1_host; |
|
int lpid = gp->l1_lpid; |
|
long ref; |
|
|
|
spin_lock(&kvm->mmu_lock); |
|
if (gp == kvm->arch.nested_guests[lpid]) { |
|
kvm->arch.nested_guests[lpid] = NULL; |
|
if (lpid == kvm->arch.max_nested_lpid) { |
|
while (--lpid >= 0 && !kvm->arch.nested_guests[lpid]) |
|
; |
|
kvm->arch.max_nested_lpid = lpid; |
|
} |
|
--gp->refcnt; |
|
} |
|
ref = gp->refcnt; |
|
spin_unlock(&kvm->mmu_lock); |
|
if (ref == 0) |
|
kvmhv_release_nested(gp); |
|
} |
|
|
|
/* |
|
* Free up all nested resources allocated for this guest. |
|
* This is called with no vcpus of the guest running, when |
|
* switching the guest to HPT mode or when destroying the |
|
* guest. |
|
*/ |
|
void kvmhv_release_all_nested(struct kvm *kvm) |
|
{ |
|
int i; |
|
struct kvm_nested_guest *gp; |
|
struct kvm_nested_guest *freelist = NULL; |
|
struct kvm_memory_slot *memslot; |
|
int srcu_idx; |
|
|
|
spin_lock(&kvm->mmu_lock); |
|
for (i = 0; i <= kvm->arch.max_nested_lpid; i++) { |
|
gp = kvm->arch.nested_guests[i]; |
|
if (!gp) |
|
continue; |
|
kvm->arch.nested_guests[i] = NULL; |
|
if (--gp->refcnt == 0) { |
|
gp->next = freelist; |
|
freelist = gp; |
|
} |
|
} |
|
kvm->arch.max_nested_lpid = -1; |
|
spin_unlock(&kvm->mmu_lock); |
|
while ((gp = freelist) != NULL) { |
|
freelist = gp->next; |
|
kvmhv_release_nested(gp); |
|
} |
|
|
|
srcu_idx = srcu_read_lock(&kvm->srcu); |
|
kvm_for_each_memslot(memslot, kvm_memslots(kvm)) |
|
kvmhv_free_memslot_nest_rmap(memslot); |
|
srcu_read_unlock(&kvm->srcu, srcu_idx); |
|
} |
|
|
|
/* caller must hold gp->tlb_lock */ |
|
static void kvmhv_flush_nested(struct kvm_nested_guest *gp) |
|
{ |
|
struct kvm *kvm = gp->l1_host; |
|
|
|
spin_lock(&kvm->mmu_lock); |
|
kvmppc_free_pgtable_radix(kvm, gp->shadow_pgtable, gp->shadow_lpid); |
|
spin_unlock(&kvm->mmu_lock); |
|
kvmhv_flush_lpid(gp->shadow_lpid); |
|
kvmhv_update_ptbl_cache(gp); |
|
if (gp->l1_gr_to_hr == 0) |
|
kvmhv_remove_nested(gp); |
|
} |
|
|
|
struct kvm_nested_guest *kvmhv_get_nested(struct kvm *kvm, int l1_lpid, |
|
bool create) |
|
{ |
|
struct kvm_nested_guest *gp, *newgp; |
|
|
|
if (l1_lpid >= KVM_MAX_NESTED_GUESTS || |
|
l1_lpid >= (1ul << ((kvm->arch.l1_ptcr & PRTS_MASK) + 12 - 4))) |
|
return NULL; |
|
|
|
spin_lock(&kvm->mmu_lock); |
|
gp = kvm->arch.nested_guests[l1_lpid]; |
|
if (gp) |
|
++gp->refcnt; |
|
spin_unlock(&kvm->mmu_lock); |
|
|
|
if (gp || !create) |
|
return gp; |
|
|
|
newgp = kvmhv_alloc_nested(kvm, l1_lpid); |
|
if (!newgp) |
|
return NULL; |
|
spin_lock(&kvm->mmu_lock); |
|
if (kvm->arch.nested_guests[l1_lpid]) { |
|
/* someone else beat us to it */ |
|
gp = kvm->arch.nested_guests[l1_lpid]; |
|
} else { |
|
kvm->arch.nested_guests[l1_lpid] = newgp; |
|
++newgp->refcnt; |
|
gp = newgp; |
|
newgp = NULL; |
|
if (l1_lpid > kvm->arch.max_nested_lpid) |
|
kvm->arch.max_nested_lpid = l1_lpid; |
|
} |
|
++gp->refcnt; |
|
spin_unlock(&kvm->mmu_lock); |
|
|
|
if (newgp) |
|
kvmhv_release_nested(newgp); |
|
|
|
return gp; |
|
} |
|
|
|
void kvmhv_put_nested(struct kvm_nested_guest *gp) |
|
{ |
|
struct kvm *kvm = gp->l1_host; |
|
long ref; |
|
|
|
spin_lock(&kvm->mmu_lock); |
|
ref = --gp->refcnt; |
|
spin_unlock(&kvm->mmu_lock); |
|
if (ref == 0) |
|
kvmhv_release_nested(gp); |
|
} |
|
|
|
static struct kvm_nested_guest *kvmhv_find_nested(struct kvm *kvm, int lpid) |
|
{ |
|
if (lpid > kvm->arch.max_nested_lpid) |
|
return NULL; |
|
return kvm->arch.nested_guests[lpid]; |
|
} |
|
|
|
pte_t *find_kvm_nested_guest_pte(struct kvm *kvm, unsigned long lpid, |
|
unsigned long ea, unsigned *hshift) |
|
{ |
|
struct kvm_nested_guest *gp; |
|
pte_t *pte; |
|
|
|
gp = kvmhv_find_nested(kvm, lpid); |
|
if (!gp) |
|
return NULL; |
|
|
|
VM_WARN(!spin_is_locked(&kvm->mmu_lock), |
|
"%s called with kvm mmu_lock not held \n", __func__); |
|
pte = __find_linux_pte(gp->shadow_pgtable, ea, NULL, hshift); |
|
|
|
return pte; |
|
} |
|
|
|
static inline bool kvmhv_n_rmap_is_equal(u64 rmap_1, u64 rmap_2) |
|
{ |
|
return !((rmap_1 ^ rmap_2) & (RMAP_NESTED_LPID_MASK | |
|
RMAP_NESTED_GPA_MASK)); |
|
} |
|
|
|
void kvmhv_insert_nest_rmap(struct kvm *kvm, unsigned long *rmapp, |
|
struct rmap_nested **n_rmap) |
|
{ |
|
struct llist_node *entry = ((struct llist_head *) rmapp)->first; |
|
struct rmap_nested *cursor; |
|
u64 rmap, new_rmap = (*n_rmap)->rmap; |
|
|
|
/* Are there any existing entries? */ |
|
if (!(*rmapp)) { |
|
/* No -> use the rmap as a single entry */ |
|
*rmapp = new_rmap | RMAP_NESTED_IS_SINGLE_ENTRY; |
|
return; |
|
} |
|
|
|
/* Do any entries match what we're trying to insert? */ |
|
for_each_nest_rmap_safe(cursor, entry, &rmap) { |
|
if (kvmhv_n_rmap_is_equal(rmap, new_rmap)) |
|
return; |
|
} |
|
|
|
/* Do we need to create a list or just add the new entry? */ |
|
rmap = *rmapp; |
|
if (rmap & RMAP_NESTED_IS_SINGLE_ENTRY) /* Not previously a list */ |
|
*rmapp = 0UL; |
|
llist_add(&((*n_rmap)->list), (struct llist_head *) rmapp); |
|
if (rmap & RMAP_NESTED_IS_SINGLE_ENTRY) /* Not previously a list */ |
|
(*n_rmap)->list.next = (struct llist_node *) rmap; |
|
|
|
/* Set NULL so not freed by caller */ |
|
*n_rmap = NULL; |
|
} |
|
|
|
static void kvmhv_update_nest_rmap_rc(struct kvm *kvm, u64 n_rmap, |
|
unsigned long clr, unsigned long set, |
|
unsigned long hpa, unsigned long mask) |
|
{ |
|
unsigned long gpa; |
|
unsigned int shift, lpid; |
|
pte_t *ptep; |
|
|
|
gpa = n_rmap & RMAP_NESTED_GPA_MASK; |
|
lpid = (n_rmap & RMAP_NESTED_LPID_MASK) >> RMAP_NESTED_LPID_SHIFT; |
|
|
|
/* Find the pte */ |
|
ptep = find_kvm_nested_guest_pte(kvm, lpid, gpa, &shift); |
|
/* |
|
* If the pte is present and the pfn is still the same, update the pte. |
|
* If the pfn has changed then this is a stale rmap entry, the nested |
|
* gpa actually points somewhere else now, and there is nothing to do. |
|
* XXX A future optimisation would be to remove the rmap entry here. |
|
*/ |
|
if (ptep && pte_present(*ptep) && ((pte_val(*ptep) & mask) == hpa)) { |
|
__radix_pte_update(ptep, clr, set); |
|
kvmppc_radix_tlbie_page(kvm, gpa, shift, lpid); |
|
} |
|
} |
|
|
|
/* |
|
* For a given list of rmap entries, update the rc bits in all ptes in shadow |
|
* page tables for nested guests which are referenced by the rmap list. |
|
*/ |
|
void kvmhv_update_nest_rmap_rc_list(struct kvm *kvm, unsigned long *rmapp, |
|
unsigned long clr, unsigned long set, |
|
unsigned long hpa, unsigned long nbytes) |
|
{ |
|
struct llist_node *entry = ((struct llist_head *) rmapp)->first; |
|
struct rmap_nested *cursor; |
|
unsigned long rmap, mask; |
|
|
|
if ((clr | set) & ~(_PAGE_DIRTY | _PAGE_ACCESSED)) |
|
return; |
|
|
|
mask = PTE_RPN_MASK & ~(nbytes - 1); |
|
hpa &= mask; |
|
|
|
for_each_nest_rmap_safe(cursor, entry, &rmap) |
|
kvmhv_update_nest_rmap_rc(kvm, rmap, clr, set, hpa, mask); |
|
} |
|
|
|
static void kvmhv_remove_nest_rmap(struct kvm *kvm, u64 n_rmap, |
|
unsigned long hpa, unsigned long mask) |
|
{ |
|
struct kvm_nested_guest *gp; |
|
unsigned long gpa; |
|
unsigned int shift, lpid; |
|
pte_t *ptep; |
|
|
|
gpa = n_rmap & RMAP_NESTED_GPA_MASK; |
|
lpid = (n_rmap & RMAP_NESTED_LPID_MASK) >> RMAP_NESTED_LPID_SHIFT; |
|
gp = kvmhv_find_nested(kvm, lpid); |
|
if (!gp) |
|
return; |
|
|
|
/* Find and invalidate the pte */ |
|
ptep = find_kvm_nested_guest_pte(kvm, lpid, gpa, &shift); |
|
/* Don't spuriously invalidate ptes if the pfn has changed */ |
|
if (ptep && pte_present(*ptep) && ((pte_val(*ptep) & mask) == hpa)) |
|
kvmppc_unmap_pte(kvm, ptep, gpa, shift, NULL, gp->shadow_lpid); |
|
} |
|
|
|
static void kvmhv_remove_nest_rmap_list(struct kvm *kvm, unsigned long *rmapp, |
|
unsigned long hpa, unsigned long mask) |
|
{ |
|
struct llist_node *entry = llist_del_all((struct llist_head *) rmapp); |
|
struct rmap_nested *cursor; |
|
unsigned long rmap; |
|
|
|
for_each_nest_rmap_safe(cursor, entry, &rmap) { |
|
kvmhv_remove_nest_rmap(kvm, rmap, hpa, mask); |
|
kfree(cursor); |
|
} |
|
} |
|
|
|
/* called with kvm->mmu_lock held */ |
|
void kvmhv_remove_nest_rmap_range(struct kvm *kvm, |
|
const struct kvm_memory_slot *memslot, |
|
unsigned long gpa, unsigned long hpa, |
|
unsigned long nbytes) |
|
{ |
|
unsigned long gfn, end_gfn; |
|
unsigned long addr_mask; |
|
|
|
if (!memslot) |
|
return; |
|
gfn = (gpa >> PAGE_SHIFT) - memslot->base_gfn; |
|
end_gfn = gfn + (nbytes >> PAGE_SHIFT); |
|
|
|
addr_mask = PTE_RPN_MASK & ~(nbytes - 1); |
|
hpa &= addr_mask; |
|
|
|
for (; gfn < end_gfn; gfn++) { |
|
unsigned long *rmap = &memslot->arch.rmap[gfn]; |
|
kvmhv_remove_nest_rmap_list(kvm, rmap, hpa, addr_mask); |
|
} |
|
} |
|
|
|
static void kvmhv_free_memslot_nest_rmap(struct kvm_memory_slot *free) |
|
{ |
|
unsigned long page; |
|
|
|
for (page = 0; page < free->npages; page++) { |
|
unsigned long rmap, *rmapp = &free->arch.rmap[page]; |
|
struct rmap_nested *cursor; |
|
struct llist_node *entry; |
|
|
|
entry = llist_del_all((struct llist_head *) rmapp); |
|
for_each_nest_rmap_safe(cursor, entry, &rmap) |
|
kfree(cursor); |
|
} |
|
} |
|
|
|
static bool kvmhv_invalidate_shadow_pte(struct kvm_vcpu *vcpu, |
|
struct kvm_nested_guest *gp, |
|
long gpa, int *shift_ret) |
|
{ |
|
struct kvm *kvm = vcpu->kvm; |
|
bool ret = false; |
|
pte_t *ptep; |
|
int shift; |
|
|
|
spin_lock(&kvm->mmu_lock); |
|
ptep = find_kvm_nested_guest_pte(kvm, gp->l1_lpid, gpa, &shift); |
|
if (!shift) |
|
shift = PAGE_SHIFT; |
|
if (ptep && pte_present(*ptep)) { |
|
kvmppc_unmap_pte(kvm, ptep, gpa, shift, NULL, gp->shadow_lpid); |
|
ret = true; |
|
} |
|
spin_unlock(&kvm->mmu_lock); |
|
|
|
if (shift_ret) |
|
*shift_ret = shift; |
|
return ret; |
|
} |
|
|
|
static inline int get_ric(unsigned int instr) |
|
{ |
|
return (instr >> 18) & 0x3; |
|
} |
|
|
|
static inline int get_prs(unsigned int instr) |
|
{ |
|
return (instr >> 17) & 0x1; |
|
} |
|
|
|
static inline int get_r(unsigned int instr) |
|
{ |
|
return (instr >> 16) & 0x1; |
|
} |
|
|
|
static inline int get_lpid(unsigned long r_val) |
|
{ |
|
return r_val & 0xffffffff; |
|
} |
|
|
|
static inline int get_is(unsigned long r_val) |
|
{ |
|
return (r_val >> 10) & 0x3; |
|
} |
|
|
|
static inline int get_ap(unsigned long r_val) |
|
{ |
|
return (r_val >> 5) & 0x7; |
|
} |
|
|
|
static inline long get_epn(unsigned long r_val) |
|
{ |
|
return r_val >> 12; |
|
} |
|
|
|
static int kvmhv_emulate_tlbie_tlb_addr(struct kvm_vcpu *vcpu, int lpid, |
|
int ap, long epn) |
|
{ |
|
struct kvm *kvm = vcpu->kvm; |
|
struct kvm_nested_guest *gp; |
|
long npages; |
|
int shift, shadow_shift; |
|
unsigned long addr; |
|
|
|
shift = ap_to_shift(ap); |
|
addr = epn << 12; |
|
if (shift < 0) |
|
/* Invalid ap encoding */ |
|
return -EINVAL; |
|
|
|
addr &= ~((1UL << shift) - 1); |
|
npages = 1UL << (shift - PAGE_SHIFT); |
|
|
|
gp = kvmhv_get_nested(kvm, lpid, false); |
|
if (!gp) /* No such guest -> nothing to do */ |
|
return 0; |
|
mutex_lock(&gp->tlb_lock); |
|
|
|
/* There may be more than one host page backing this single guest pte */ |
|
do { |
|
kvmhv_invalidate_shadow_pte(vcpu, gp, addr, &shadow_shift); |
|
|
|
npages -= 1UL << (shadow_shift - PAGE_SHIFT); |
|
addr += 1UL << shadow_shift; |
|
} while (npages > 0); |
|
|
|
mutex_unlock(&gp->tlb_lock); |
|
kvmhv_put_nested(gp); |
|
return 0; |
|
} |
|
|
|
static void kvmhv_emulate_tlbie_lpid(struct kvm_vcpu *vcpu, |
|
struct kvm_nested_guest *gp, int ric) |
|
{ |
|
struct kvm *kvm = vcpu->kvm; |
|
|
|
mutex_lock(&gp->tlb_lock); |
|
switch (ric) { |
|
case 0: |
|
/* Invalidate TLB */ |
|
spin_lock(&kvm->mmu_lock); |
|
kvmppc_free_pgtable_radix(kvm, gp->shadow_pgtable, |
|
gp->shadow_lpid); |
|
kvmhv_flush_lpid(gp->shadow_lpid); |
|
spin_unlock(&kvm->mmu_lock); |
|
break; |
|
case 1: |
|
/* |
|
* Invalidate PWC |
|
* We don't cache this -> nothing to do |
|
*/ |
|
break; |
|
case 2: |
|
/* Invalidate TLB, PWC and caching of partition table entries */ |
|
kvmhv_flush_nested(gp); |
|
break; |
|
default: |
|
break; |
|
} |
|
mutex_unlock(&gp->tlb_lock); |
|
} |
|
|
|
static void kvmhv_emulate_tlbie_all_lpid(struct kvm_vcpu *vcpu, int ric) |
|
{ |
|
struct kvm *kvm = vcpu->kvm; |
|
struct kvm_nested_guest *gp; |
|
int i; |
|
|
|
spin_lock(&kvm->mmu_lock); |
|
for (i = 0; i <= kvm->arch.max_nested_lpid; i++) { |
|
gp = kvm->arch.nested_guests[i]; |
|
if (gp) { |
|
spin_unlock(&kvm->mmu_lock); |
|
kvmhv_emulate_tlbie_lpid(vcpu, gp, ric); |
|
spin_lock(&kvm->mmu_lock); |
|
} |
|
} |
|
spin_unlock(&kvm->mmu_lock); |
|
} |
|
|
|
static int kvmhv_emulate_priv_tlbie(struct kvm_vcpu *vcpu, unsigned int instr, |
|
unsigned long rsval, unsigned long rbval) |
|
{ |
|
struct kvm *kvm = vcpu->kvm; |
|
struct kvm_nested_guest *gp; |
|
int r, ric, prs, is, ap; |
|
int lpid; |
|
long epn; |
|
int ret = 0; |
|
|
|
ric = get_ric(instr); |
|
prs = get_prs(instr); |
|
r = get_r(instr); |
|
lpid = get_lpid(rsval); |
|
is = get_is(rbval); |
|
|
|
/* |
|
* These cases are invalid and are not handled: |
|
* r != 1 -> Only radix supported |
|
* prs == 1 -> Not HV privileged |
|
* ric == 3 -> No cluster bombs for radix |
|
* is == 1 -> Partition scoped translations not associated with pid |
|
* (!is) && (ric == 1 || ric == 2) -> Not supported by ISA |
|
*/ |
|
if ((!r) || (prs) || (ric == 3) || (is == 1) || |
|
((!is) && (ric == 1 || ric == 2))) |
|
return -EINVAL; |
|
|
|
switch (is) { |
|
case 0: |
|
/* |
|
* We know ric == 0 |
|
* Invalidate TLB for a given target address |
|
*/ |
|
epn = get_epn(rbval); |
|
ap = get_ap(rbval); |
|
ret = kvmhv_emulate_tlbie_tlb_addr(vcpu, lpid, ap, epn); |
|
break; |
|
case 2: |
|
/* Invalidate matching LPID */ |
|
gp = kvmhv_get_nested(kvm, lpid, false); |
|
if (gp) { |
|
kvmhv_emulate_tlbie_lpid(vcpu, gp, ric); |
|
kvmhv_put_nested(gp); |
|
} |
|
break; |
|
case 3: |
|
/* Invalidate ALL LPIDs */ |
|
kvmhv_emulate_tlbie_all_lpid(vcpu, ric); |
|
break; |
|
default: |
|
ret = -EINVAL; |
|
break; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* This handles the H_TLB_INVALIDATE hcall. |
|
* Parameters are (r4) tlbie instruction code, (r5) rS contents, |
|
* (r6) rB contents. |
|
*/ |
|
long kvmhv_do_nested_tlbie(struct kvm_vcpu *vcpu) |
|
{ |
|
int ret; |
|
|
|
ret = kvmhv_emulate_priv_tlbie(vcpu, kvmppc_get_gpr(vcpu, 4), |
|
kvmppc_get_gpr(vcpu, 5), kvmppc_get_gpr(vcpu, 6)); |
|
if (ret) |
|
return H_PARAMETER; |
|
return H_SUCCESS; |
|
} |
|
|
|
static long do_tlb_invalidate_nested_all(struct kvm_vcpu *vcpu, |
|
unsigned long lpid, unsigned long ric) |
|
{ |
|
struct kvm *kvm = vcpu->kvm; |
|
struct kvm_nested_guest *gp; |
|
|
|
gp = kvmhv_get_nested(kvm, lpid, false); |
|
if (gp) { |
|
kvmhv_emulate_tlbie_lpid(vcpu, gp, ric); |
|
kvmhv_put_nested(gp); |
|
} |
|
return H_SUCCESS; |
|
} |
|
|
|
/* |
|
* Number of pages above which we invalidate the entire LPID rather than |
|
* flush individual pages. |
|
*/ |
|
static unsigned long tlb_range_flush_page_ceiling __read_mostly = 33; |
|
|
|
static long do_tlb_invalidate_nested_tlb(struct kvm_vcpu *vcpu, |
|
unsigned long lpid, |
|
unsigned long pg_sizes, |
|
unsigned long start, |
|
unsigned long end) |
|
{ |
|
int ret = H_P4; |
|
unsigned long addr, nr_pages; |
|
struct mmu_psize_def *def; |
|
unsigned long psize, ap, page_size; |
|
bool flush_lpid; |
|
|
|
for (psize = 0; psize < MMU_PAGE_COUNT; psize++) { |
|
def = &mmu_psize_defs[psize]; |
|
if (!(pg_sizes & def->h_rpt_pgsize)) |
|
continue; |
|
|
|
nr_pages = (end - start) >> def->shift; |
|
flush_lpid = nr_pages > tlb_range_flush_page_ceiling; |
|
if (flush_lpid) |
|
return do_tlb_invalidate_nested_all(vcpu, lpid, |
|
RIC_FLUSH_TLB); |
|
addr = start; |
|
ap = mmu_get_ap(psize); |
|
page_size = 1UL << def->shift; |
|
do { |
|
ret = kvmhv_emulate_tlbie_tlb_addr(vcpu, lpid, ap, |
|
get_epn(addr)); |
|
if (ret) |
|
return H_P4; |
|
addr += page_size; |
|
} while (addr < end); |
|
} |
|
return ret; |
|
} |
|
|
|
/* |
|
* Performs partition-scoped invalidations for nested guests |
|
* as part of H_RPT_INVALIDATE hcall. |
|
*/ |
|
long do_h_rpt_invalidate_pat(struct kvm_vcpu *vcpu, unsigned long lpid, |
|
unsigned long type, unsigned long pg_sizes, |
|
unsigned long start, unsigned long end) |
|
{ |
|
/* |
|
* If L2 lpid isn't valid, we need to return H_PARAMETER. |
|
* |
|
* However, nested KVM issues a L2 lpid flush call when creating |
|
* partition table entries for L2. This happens even before the |
|
* corresponding shadow lpid is created in HV which happens in |
|
* H_ENTER_NESTED call. Since we can't differentiate this case from |
|
* the invalid case, we ignore such flush requests and return success. |
|
*/ |
|
if (!kvmhv_find_nested(vcpu->kvm, lpid)) |
|
return H_SUCCESS; |
|
|
|
/* |
|
* A flush all request can be handled by a full lpid flush only. |
|
*/ |
|
if ((type & H_RPTI_TYPE_NESTED_ALL) == H_RPTI_TYPE_NESTED_ALL) |
|
return do_tlb_invalidate_nested_all(vcpu, lpid, RIC_FLUSH_ALL); |
|
|
|
/* |
|
* We don't need to handle a PWC flush like process table here, |
|
* because intermediate partition scoped table in nested guest doesn't |
|
* really have PWC. Only level we have PWC is in L0 and for nested |
|
* invalidate at L0 we always do kvm_flush_lpid() which does |
|
* radix__flush_all_lpid(). For range invalidate at any level, we |
|
* are not removing the higher level page tables and hence there is |
|
* no PWC invalidate needed. |
|
* |
|
* if (type & H_RPTI_TYPE_PWC) { |
|
* ret = do_tlb_invalidate_nested_all(vcpu, lpid, RIC_FLUSH_PWC); |
|
* if (ret) |
|
* return H_P4; |
|
* } |
|
*/ |
|
|
|
if (start == 0 && end == -1) |
|
return do_tlb_invalidate_nested_all(vcpu, lpid, RIC_FLUSH_TLB); |
|
|
|
if (type & H_RPTI_TYPE_TLB) |
|
return do_tlb_invalidate_nested_tlb(vcpu, lpid, pg_sizes, |
|
start, end); |
|
return H_SUCCESS; |
|
} |
|
|
|
/* Used to convert a nested guest real address to a L1 guest real address */ |
|
static int kvmhv_translate_addr_nested(struct kvm_vcpu *vcpu, |
|
struct kvm_nested_guest *gp, |
|
unsigned long n_gpa, unsigned long dsisr, |
|
struct kvmppc_pte *gpte_p) |
|
{ |
|
u64 fault_addr, flags = dsisr & DSISR_ISSTORE; |
|
int ret; |
|
|
|
ret = kvmppc_mmu_walk_radix_tree(vcpu, n_gpa, gpte_p, gp->l1_gr_to_hr, |
|
&fault_addr); |
|
|
|
if (ret) { |
|
/* We didn't find a pte */ |
|
if (ret == -EINVAL) { |
|
/* Unsupported mmu config */ |
|
flags |= DSISR_UNSUPP_MMU; |
|
} else if (ret == -ENOENT) { |
|
/* No translation found */ |
|
flags |= DSISR_NOHPTE; |
|
} else if (ret == -EFAULT) { |
|
/* Couldn't access L1 real address */ |
|
flags |= DSISR_PRTABLE_FAULT; |
|
vcpu->arch.fault_gpa = fault_addr; |
|
} else { |
|
/* Unknown error */ |
|
return ret; |
|
} |
|
goto forward_to_l1; |
|
} else { |
|
/* We found a pte -> check permissions */ |
|
if (dsisr & DSISR_ISSTORE) { |
|
/* Can we write? */ |
|
if (!gpte_p->may_write) { |
|
flags |= DSISR_PROTFAULT; |
|
goto forward_to_l1; |
|
} |
|
} else if (vcpu->arch.trap == BOOK3S_INTERRUPT_H_INST_STORAGE) { |
|
/* Can we execute? */ |
|
if (!gpte_p->may_execute) { |
|
flags |= SRR1_ISI_N_G_OR_CIP; |
|
goto forward_to_l1; |
|
} |
|
} else { |
|
/* Can we read? */ |
|
if (!gpte_p->may_read && !gpte_p->may_write) { |
|
flags |= DSISR_PROTFAULT; |
|
goto forward_to_l1; |
|
} |
|
} |
|
} |
|
|
|
return 0; |
|
|
|
forward_to_l1: |
|
vcpu->arch.fault_dsisr = flags; |
|
if (vcpu->arch.trap == BOOK3S_INTERRUPT_H_INST_STORAGE) { |
|
vcpu->arch.shregs.msr &= SRR1_MSR_BITS; |
|
vcpu->arch.shregs.msr |= flags; |
|
} |
|
return RESUME_HOST; |
|
} |
|
|
|
static long kvmhv_handle_nested_set_rc(struct kvm_vcpu *vcpu, |
|
struct kvm_nested_guest *gp, |
|
unsigned long n_gpa, |
|
struct kvmppc_pte gpte, |
|
unsigned long dsisr) |
|
{ |
|
struct kvm *kvm = vcpu->kvm; |
|
bool writing = !!(dsisr & DSISR_ISSTORE); |
|
u64 pgflags; |
|
long ret; |
|
|
|
/* Are the rc bits set in the L1 partition scoped pte? */ |
|
pgflags = _PAGE_ACCESSED; |
|
if (writing) |
|
pgflags |= _PAGE_DIRTY; |
|
if (pgflags & ~gpte.rc) |
|
return RESUME_HOST; |
|
|
|
spin_lock(&kvm->mmu_lock); |
|
/* Set the rc bit in the pte of our (L0) pgtable for the L1 guest */ |
|
ret = kvmppc_hv_handle_set_rc(kvm, false, writing, |
|
gpte.raddr, kvm->arch.lpid); |
|
if (!ret) { |
|
ret = -EINVAL; |
|
goto out_unlock; |
|
} |
|
|
|
/* Set the rc bit in the pte of the shadow_pgtable for the nest guest */ |
|
ret = kvmppc_hv_handle_set_rc(kvm, true, writing, |
|
n_gpa, gp->l1_lpid); |
|
if (!ret) |
|
ret = -EINVAL; |
|
else |
|
ret = 0; |
|
|
|
out_unlock: |
|
spin_unlock(&kvm->mmu_lock); |
|
return ret; |
|
} |
|
|
|
static inline int kvmppc_radix_level_to_shift(int level) |
|
{ |
|
switch (level) { |
|
case 2: |
|
return PUD_SHIFT; |
|
case 1: |
|
return PMD_SHIFT; |
|
default: |
|
return PAGE_SHIFT; |
|
} |
|
} |
|
|
|
static inline int kvmppc_radix_shift_to_level(int shift) |
|
{ |
|
if (shift == PUD_SHIFT) |
|
return 2; |
|
if (shift == PMD_SHIFT) |
|
return 1; |
|
if (shift == PAGE_SHIFT) |
|
return 0; |
|
WARN_ON_ONCE(1); |
|
return 0; |
|
} |
|
|
|
/* called with gp->tlb_lock held */ |
|
static long int __kvmhv_nested_page_fault(struct kvm_vcpu *vcpu, |
|
struct kvm_nested_guest *gp) |
|
{ |
|
struct kvm *kvm = vcpu->kvm; |
|
struct kvm_memory_slot *memslot; |
|
struct rmap_nested *n_rmap; |
|
struct kvmppc_pte gpte; |
|
pte_t pte, *pte_p; |
|
unsigned long mmu_seq; |
|
unsigned long dsisr = vcpu->arch.fault_dsisr; |
|
unsigned long ea = vcpu->arch.fault_dar; |
|
unsigned long *rmapp; |
|
unsigned long n_gpa, gpa, gfn, perm = 0UL; |
|
unsigned int shift, l1_shift, level; |
|
bool writing = !!(dsisr & DSISR_ISSTORE); |
|
bool kvm_ro = false; |
|
long int ret; |
|
|
|
if (!gp->l1_gr_to_hr) { |
|
kvmhv_update_ptbl_cache(gp); |
|
if (!gp->l1_gr_to_hr) |
|
return RESUME_HOST; |
|
} |
|
|
|
/* Convert the nested guest real address into a L1 guest real address */ |
|
|
|
n_gpa = vcpu->arch.fault_gpa & ~0xF000000000000FFFULL; |
|
if (!(dsisr & DSISR_PRTABLE_FAULT)) |
|
n_gpa |= ea & 0xFFF; |
|
ret = kvmhv_translate_addr_nested(vcpu, gp, n_gpa, dsisr, &gpte); |
|
|
|
/* |
|
* If the hardware found a translation but we don't now have a usable |
|
* translation in the l1 partition-scoped tree, remove the shadow pte |
|
* and let the guest retry. |
|
*/ |
|
if (ret == RESUME_HOST && |
|
(dsisr & (DSISR_PROTFAULT | DSISR_BADACCESS | DSISR_NOEXEC_OR_G | |
|
DSISR_BAD_COPYPASTE))) |
|
goto inval; |
|
if (ret) |
|
return ret; |
|
|
|
/* Failed to set the reference/change bits */ |
|
if (dsisr & DSISR_SET_RC) { |
|
ret = kvmhv_handle_nested_set_rc(vcpu, gp, n_gpa, gpte, dsisr); |
|
if (ret == RESUME_HOST) |
|
return ret; |
|
if (ret) |
|
goto inval; |
|
dsisr &= ~DSISR_SET_RC; |
|
if (!(dsisr & (DSISR_BAD_FAULT_64S | DSISR_NOHPTE | |
|
DSISR_PROTFAULT))) |
|
return RESUME_GUEST; |
|
} |
|
|
|
/* |
|
* We took an HISI or HDSI while we were running a nested guest which |
|
* means we have no partition scoped translation for that. This means |
|
* we need to insert a pte for the mapping into our shadow_pgtable. |
|
*/ |
|
|
|
l1_shift = gpte.page_shift; |
|
if (l1_shift < PAGE_SHIFT) { |
|
/* We don't support l1 using a page size smaller than our own */ |
|
pr_err("KVM: L1 guest page shift (%d) less than our own (%d)\n", |
|
l1_shift, PAGE_SHIFT); |
|
return -EINVAL; |
|
} |
|
gpa = gpte.raddr; |
|
gfn = gpa >> PAGE_SHIFT; |
|
|
|
/* 1. Get the corresponding host memslot */ |
|
|
|
memslot = gfn_to_memslot(kvm, gfn); |
|
if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) { |
|
if (dsisr & (DSISR_PRTABLE_FAULT | DSISR_BADACCESS)) { |
|
/* unusual error -> reflect to the guest as a DSI */ |
|
kvmppc_core_queue_data_storage(vcpu, ea, dsisr); |
|
return RESUME_GUEST; |
|
} |
|
|
|
/* passthrough of emulated MMIO case */ |
|
return kvmppc_hv_emulate_mmio(vcpu, gpa, ea, writing); |
|
} |
|
if (memslot->flags & KVM_MEM_READONLY) { |
|
if (writing) { |
|
/* Give the guest a DSI */ |
|
kvmppc_core_queue_data_storage(vcpu, ea, |
|
DSISR_ISSTORE | DSISR_PROTFAULT); |
|
return RESUME_GUEST; |
|
} |
|
kvm_ro = true; |
|
} |
|
|
|
/* 2. Find the host pte for this L1 guest real address */ |
|
|
|
/* Used to check for invalidations in progress */ |
|
mmu_seq = kvm->mmu_notifier_seq; |
|
smp_rmb(); |
|
|
|
/* See if can find translation in our partition scoped tables for L1 */ |
|
pte = __pte(0); |
|
spin_lock(&kvm->mmu_lock); |
|
pte_p = find_kvm_secondary_pte(kvm, gpa, &shift); |
|
if (!shift) |
|
shift = PAGE_SHIFT; |
|
if (pte_p) |
|
pte = *pte_p; |
|
spin_unlock(&kvm->mmu_lock); |
|
|
|
if (!pte_present(pte) || (writing && !(pte_val(pte) & _PAGE_WRITE))) { |
|
/* No suitable pte found -> try to insert a mapping */ |
|
ret = kvmppc_book3s_instantiate_page(vcpu, gpa, memslot, |
|
writing, kvm_ro, &pte, &level); |
|
if (ret == -EAGAIN) |
|
return RESUME_GUEST; |
|
else if (ret) |
|
return ret; |
|
shift = kvmppc_radix_level_to_shift(level); |
|
} |
|
/* Align gfn to the start of the page */ |
|
gfn = (gpa & ~((1UL << shift) - 1)) >> PAGE_SHIFT; |
|
|
|
/* 3. Compute the pte we need to insert for nest_gpa -> host r_addr */ |
|
|
|
/* The permissions is the combination of the host and l1 guest ptes */ |
|
perm |= gpte.may_read ? 0UL : _PAGE_READ; |
|
perm |= gpte.may_write ? 0UL : _PAGE_WRITE; |
|
perm |= gpte.may_execute ? 0UL : _PAGE_EXEC; |
|
/* Only set accessed/dirty (rc) bits if set in host and l1 guest ptes */ |
|
perm |= (gpte.rc & _PAGE_ACCESSED) ? 0UL : _PAGE_ACCESSED; |
|
perm |= ((gpte.rc & _PAGE_DIRTY) && writing) ? 0UL : _PAGE_DIRTY; |
|
pte = __pte(pte_val(pte) & ~perm); |
|
|
|
/* What size pte can we insert? */ |
|
if (shift > l1_shift) { |
|
u64 mask; |
|
unsigned int actual_shift = PAGE_SHIFT; |
|
if (PMD_SHIFT < l1_shift) |
|
actual_shift = PMD_SHIFT; |
|
mask = (1UL << shift) - (1UL << actual_shift); |
|
pte = __pte(pte_val(pte) | (gpa & mask)); |
|
shift = actual_shift; |
|
} |
|
level = kvmppc_radix_shift_to_level(shift); |
|
n_gpa &= ~((1UL << shift) - 1); |
|
|
|
/* 4. Insert the pte into our shadow_pgtable */ |
|
|
|
n_rmap = kzalloc(sizeof(*n_rmap), GFP_KERNEL); |
|
if (!n_rmap) |
|
return RESUME_GUEST; /* Let the guest try again */ |
|
n_rmap->rmap = (n_gpa & RMAP_NESTED_GPA_MASK) | |
|
(((unsigned long) gp->l1_lpid) << RMAP_NESTED_LPID_SHIFT); |
|
rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn]; |
|
ret = kvmppc_create_pte(kvm, gp->shadow_pgtable, pte, n_gpa, level, |
|
mmu_seq, gp->shadow_lpid, rmapp, &n_rmap); |
|
kfree(n_rmap); |
|
if (ret == -EAGAIN) |
|
ret = RESUME_GUEST; /* Let the guest try again */ |
|
|
|
return ret; |
|
|
|
inval: |
|
kvmhv_invalidate_shadow_pte(vcpu, gp, n_gpa, NULL); |
|
return RESUME_GUEST; |
|
} |
|
|
|
long int kvmhv_nested_page_fault(struct kvm_vcpu *vcpu) |
|
{ |
|
struct kvm_nested_guest *gp = vcpu->arch.nested; |
|
long int ret; |
|
|
|
mutex_lock(&gp->tlb_lock); |
|
ret = __kvmhv_nested_page_fault(vcpu, gp); |
|
mutex_unlock(&gp->tlb_lock); |
|
return ret; |
|
} |
|
|
|
int kvmhv_nested_next_lpid(struct kvm *kvm, int lpid) |
|
{ |
|
int ret = -1; |
|
|
|
spin_lock(&kvm->mmu_lock); |
|
while (++lpid <= kvm->arch.max_nested_lpid) { |
|
if (kvm->arch.nested_guests[lpid]) { |
|
ret = lpid; |
|
break; |
|
} |
|
} |
|
spin_unlock(&kvm->mmu_lock); |
|
return ret; |
|
}
|
|
|