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722 lines
19 KiB
722 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright © 2019 Oracle and/or its affiliates. All rights reserved. |
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* Copyright © 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved. |
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* |
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* KVM Xen emulation |
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*/ |
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|
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#include "x86.h" |
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#include "xen.h" |
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#include "hyperv.h" |
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#include <linux/kvm_host.h> |
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#include <linux/sched/stat.h> |
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#include <trace/events/kvm.h> |
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#include <xen/interface/xen.h> |
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#include <xen/interface/vcpu.h> |
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#include "trace.h" |
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DEFINE_STATIC_KEY_DEFERRED_FALSE(kvm_xen_enabled, HZ); |
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static int kvm_xen_shared_info_init(struct kvm *kvm, gfn_t gfn) |
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{ |
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gpa_t gpa = gfn_to_gpa(gfn); |
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int wc_ofs, sec_hi_ofs; |
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int ret = 0; |
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int idx = srcu_read_lock(&kvm->srcu); |
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if (kvm_is_error_hva(gfn_to_hva(kvm, gfn))) { |
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ret = -EFAULT; |
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goto out; |
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} |
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kvm->arch.xen.shinfo_gfn = gfn; |
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/* Paranoia checks on the 32-bit struct layout */ |
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BUILD_BUG_ON(offsetof(struct compat_shared_info, wc) != 0x900); |
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BUILD_BUG_ON(offsetof(struct compat_shared_info, arch.wc_sec_hi) != 0x924); |
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BUILD_BUG_ON(offsetof(struct pvclock_vcpu_time_info, version) != 0); |
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/* 32-bit location by default */ |
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wc_ofs = offsetof(struct compat_shared_info, wc); |
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sec_hi_ofs = offsetof(struct compat_shared_info, arch.wc_sec_hi); |
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#ifdef CONFIG_X86_64 |
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/* Paranoia checks on the 64-bit struct layout */ |
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BUILD_BUG_ON(offsetof(struct shared_info, wc) != 0xc00); |
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BUILD_BUG_ON(offsetof(struct shared_info, wc_sec_hi) != 0xc0c); |
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if (kvm->arch.xen.long_mode) { |
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wc_ofs = offsetof(struct shared_info, wc); |
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sec_hi_ofs = offsetof(struct shared_info, wc_sec_hi); |
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} |
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#endif |
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kvm_write_wall_clock(kvm, gpa + wc_ofs, sec_hi_ofs - wc_ofs); |
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kvm_make_all_cpus_request(kvm, KVM_REQ_MASTERCLOCK_UPDATE); |
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out: |
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srcu_read_unlock(&kvm->srcu, idx); |
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return ret; |
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} |
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static void kvm_xen_update_runstate(struct kvm_vcpu *v, int state) |
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{ |
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struct kvm_vcpu_xen *vx = &v->arch.xen; |
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u64 now = get_kvmclock_ns(v->kvm); |
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u64 delta_ns = now - vx->runstate_entry_time; |
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u64 run_delay = current->sched_info.run_delay; |
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if (unlikely(!vx->runstate_entry_time)) |
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vx->current_runstate = RUNSTATE_offline; |
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/* |
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* Time waiting for the scheduler isn't "stolen" if the |
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* vCPU wasn't running anyway. |
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*/ |
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if (vx->current_runstate == RUNSTATE_running) { |
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u64 steal_ns = run_delay - vx->last_steal; |
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delta_ns -= steal_ns; |
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vx->runstate_times[RUNSTATE_runnable] += steal_ns; |
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} |
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vx->last_steal = run_delay; |
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vx->runstate_times[vx->current_runstate] += delta_ns; |
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vx->current_runstate = state; |
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vx->runstate_entry_time = now; |
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} |
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void kvm_xen_update_runstate_guest(struct kvm_vcpu *v, int state) |
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{ |
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struct kvm_vcpu_xen *vx = &v->arch.xen; |
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uint64_t state_entry_time; |
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unsigned int offset; |
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kvm_xen_update_runstate(v, state); |
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if (!vx->runstate_set) |
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return; |
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BUILD_BUG_ON(sizeof(struct compat_vcpu_runstate_info) != 0x2c); |
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offset = offsetof(struct compat_vcpu_runstate_info, state_entry_time); |
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#ifdef CONFIG_X86_64 |
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/* |
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* The only difference is alignment of uint64_t in 32-bit. |
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* So the first field 'state' is accessed directly using |
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* offsetof() (where its offset happens to be zero), while the |
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* remaining fields which are all uint64_t, start at 'offset' |
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* which we tweak here by adding 4. |
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*/ |
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BUILD_BUG_ON(offsetof(struct vcpu_runstate_info, state_entry_time) != |
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offsetof(struct compat_vcpu_runstate_info, state_entry_time) + 4); |
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BUILD_BUG_ON(offsetof(struct vcpu_runstate_info, time) != |
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offsetof(struct compat_vcpu_runstate_info, time) + 4); |
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if (v->kvm->arch.xen.long_mode) |
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offset = offsetof(struct vcpu_runstate_info, state_entry_time); |
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#endif |
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/* |
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* First write the updated state_entry_time at the appropriate |
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* location determined by 'offset'. |
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*/ |
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state_entry_time = vx->runstate_entry_time; |
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state_entry_time |= XEN_RUNSTATE_UPDATE; |
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BUILD_BUG_ON(sizeof(((struct vcpu_runstate_info *)0)->state_entry_time) != |
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sizeof(state_entry_time)); |
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BUILD_BUG_ON(sizeof(((struct compat_vcpu_runstate_info *)0)->state_entry_time) != |
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sizeof(state_entry_time)); |
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if (kvm_write_guest_offset_cached(v->kvm, &v->arch.xen.runstate_cache, |
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&state_entry_time, offset, |
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sizeof(state_entry_time))) |
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return; |
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smp_wmb(); |
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/* |
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* Next, write the new runstate. This is in the *same* place |
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* for 32-bit and 64-bit guests, asserted here for paranoia. |
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*/ |
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BUILD_BUG_ON(offsetof(struct vcpu_runstate_info, state) != |
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offsetof(struct compat_vcpu_runstate_info, state)); |
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BUILD_BUG_ON(sizeof(((struct vcpu_runstate_info *)0)->state) != |
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sizeof(vx->current_runstate)); |
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BUILD_BUG_ON(sizeof(((struct compat_vcpu_runstate_info *)0)->state) != |
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sizeof(vx->current_runstate)); |
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if (kvm_write_guest_offset_cached(v->kvm, &v->arch.xen.runstate_cache, |
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&vx->current_runstate, |
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offsetof(struct vcpu_runstate_info, state), |
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sizeof(vx->current_runstate))) |
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return; |
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/* |
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* Write the actual runstate times immediately after the |
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* runstate_entry_time. |
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*/ |
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BUILD_BUG_ON(offsetof(struct vcpu_runstate_info, state_entry_time) != |
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offsetof(struct vcpu_runstate_info, time) - sizeof(u64)); |
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BUILD_BUG_ON(offsetof(struct compat_vcpu_runstate_info, state_entry_time) != |
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offsetof(struct compat_vcpu_runstate_info, time) - sizeof(u64)); |
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BUILD_BUG_ON(sizeof(((struct vcpu_runstate_info *)0)->time) != |
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sizeof(((struct compat_vcpu_runstate_info *)0)->time)); |
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BUILD_BUG_ON(sizeof(((struct vcpu_runstate_info *)0)->time) != |
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sizeof(vx->runstate_times)); |
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if (kvm_write_guest_offset_cached(v->kvm, &v->arch.xen.runstate_cache, |
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&vx->runstate_times[0], |
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offset + sizeof(u64), |
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sizeof(vx->runstate_times))) |
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return; |
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smp_wmb(); |
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/* |
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* Finally, clear the XEN_RUNSTATE_UPDATE bit in the guest's |
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* runstate_entry_time field. |
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*/ |
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state_entry_time &= ~XEN_RUNSTATE_UPDATE; |
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if (kvm_write_guest_offset_cached(v->kvm, &v->arch.xen.runstate_cache, |
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&state_entry_time, offset, |
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sizeof(state_entry_time))) |
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return; |
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} |
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int __kvm_xen_has_interrupt(struct kvm_vcpu *v) |
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{ |
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u8 rc = 0; |
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/* |
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* If the global upcall vector (HVMIRQ_callback_vector) is set and |
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* the vCPU's evtchn_upcall_pending flag is set, the IRQ is pending. |
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*/ |
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struct gfn_to_hva_cache *ghc = &v->arch.xen.vcpu_info_cache; |
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struct kvm_memslots *slots = kvm_memslots(v->kvm); |
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unsigned int offset = offsetof(struct vcpu_info, evtchn_upcall_pending); |
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/* No need for compat handling here */ |
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BUILD_BUG_ON(offsetof(struct vcpu_info, evtchn_upcall_pending) != |
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offsetof(struct compat_vcpu_info, evtchn_upcall_pending)); |
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BUILD_BUG_ON(sizeof(rc) != |
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sizeof(((struct vcpu_info *)0)->evtchn_upcall_pending)); |
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BUILD_BUG_ON(sizeof(rc) != |
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sizeof(((struct compat_vcpu_info *)0)->evtchn_upcall_pending)); |
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/* |
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* For efficiency, this mirrors the checks for using the valid |
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* cache in kvm_read_guest_offset_cached(), but just uses |
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* __get_user() instead. And falls back to the slow path. |
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*/ |
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if (likely(slots->generation == ghc->generation && |
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!kvm_is_error_hva(ghc->hva) && ghc->memslot)) { |
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/* Fast path */ |
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__get_user(rc, (u8 __user *)ghc->hva + offset); |
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} else { |
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/* Slow path */ |
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kvm_read_guest_offset_cached(v->kvm, ghc, &rc, offset, |
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sizeof(rc)); |
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} |
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return rc; |
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} |
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int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data) |
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{ |
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int r = -ENOENT; |
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mutex_lock(&kvm->lock); |
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switch (data->type) { |
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case KVM_XEN_ATTR_TYPE_LONG_MODE: |
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if (!IS_ENABLED(CONFIG_64BIT) && data->u.long_mode) { |
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r = -EINVAL; |
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} else { |
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kvm->arch.xen.long_mode = !!data->u.long_mode; |
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r = 0; |
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} |
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break; |
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case KVM_XEN_ATTR_TYPE_SHARED_INFO: |
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if (data->u.shared_info.gfn == GPA_INVALID) { |
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kvm->arch.xen.shinfo_gfn = GPA_INVALID; |
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r = 0; |
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break; |
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} |
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r = kvm_xen_shared_info_init(kvm, data->u.shared_info.gfn); |
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break; |
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case KVM_XEN_ATTR_TYPE_UPCALL_VECTOR: |
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if (data->u.vector && data->u.vector < 0x10) |
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r = -EINVAL; |
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else { |
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kvm->arch.xen.upcall_vector = data->u.vector; |
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r = 0; |
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} |
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break; |
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default: |
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break; |
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} |
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mutex_unlock(&kvm->lock); |
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return r; |
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} |
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int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data) |
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{ |
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int r = -ENOENT; |
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mutex_lock(&kvm->lock); |
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switch (data->type) { |
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case KVM_XEN_ATTR_TYPE_LONG_MODE: |
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data->u.long_mode = kvm->arch.xen.long_mode; |
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r = 0; |
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break; |
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case KVM_XEN_ATTR_TYPE_SHARED_INFO: |
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data->u.shared_info.gfn = gpa_to_gfn(kvm->arch.xen.shinfo_gfn); |
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r = 0; |
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break; |
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case KVM_XEN_ATTR_TYPE_UPCALL_VECTOR: |
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data->u.vector = kvm->arch.xen.upcall_vector; |
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r = 0; |
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break; |
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default: |
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break; |
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} |
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mutex_unlock(&kvm->lock); |
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return r; |
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} |
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int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data) |
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{ |
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int idx, r = -ENOENT; |
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mutex_lock(&vcpu->kvm->lock); |
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idx = srcu_read_lock(&vcpu->kvm->srcu); |
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switch (data->type) { |
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case KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO: |
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/* No compat necessary here. */ |
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BUILD_BUG_ON(sizeof(struct vcpu_info) != |
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sizeof(struct compat_vcpu_info)); |
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BUILD_BUG_ON(offsetof(struct vcpu_info, time) != |
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offsetof(struct compat_vcpu_info, time)); |
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if (data->u.gpa == GPA_INVALID) { |
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vcpu->arch.xen.vcpu_info_set = false; |
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r = 0; |
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break; |
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} |
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r = kvm_gfn_to_hva_cache_init(vcpu->kvm, |
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&vcpu->arch.xen.vcpu_info_cache, |
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data->u.gpa, |
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sizeof(struct vcpu_info)); |
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if (!r) { |
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vcpu->arch.xen.vcpu_info_set = true; |
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kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); |
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} |
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break; |
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case KVM_XEN_VCPU_ATTR_TYPE_VCPU_TIME_INFO: |
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if (data->u.gpa == GPA_INVALID) { |
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vcpu->arch.xen.vcpu_time_info_set = false; |
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r = 0; |
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break; |
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} |
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r = kvm_gfn_to_hva_cache_init(vcpu->kvm, |
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&vcpu->arch.xen.vcpu_time_info_cache, |
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data->u.gpa, |
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sizeof(struct pvclock_vcpu_time_info)); |
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if (!r) { |
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vcpu->arch.xen.vcpu_time_info_set = true; |
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kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); |
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} |
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break; |
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case KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADDR: |
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if (!sched_info_on()) { |
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r = -EOPNOTSUPP; |
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break; |
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} |
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if (data->u.gpa == GPA_INVALID) { |
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vcpu->arch.xen.runstate_set = false; |
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r = 0; |
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break; |
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} |
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r = kvm_gfn_to_hva_cache_init(vcpu->kvm, |
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&vcpu->arch.xen.runstate_cache, |
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data->u.gpa, |
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sizeof(struct vcpu_runstate_info)); |
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if (!r) { |
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vcpu->arch.xen.runstate_set = true; |
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} |
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break; |
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case KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_CURRENT: |
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if (!sched_info_on()) { |
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r = -EOPNOTSUPP; |
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break; |
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} |
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if (data->u.runstate.state > RUNSTATE_offline) { |
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r = -EINVAL; |
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break; |
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} |
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kvm_xen_update_runstate(vcpu, data->u.runstate.state); |
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r = 0; |
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break; |
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case KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_DATA: |
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if (!sched_info_on()) { |
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r = -EOPNOTSUPP; |
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break; |
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} |
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if (data->u.runstate.state > RUNSTATE_offline) { |
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r = -EINVAL; |
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break; |
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} |
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if (data->u.runstate.state_entry_time != |
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(data->u.runstate.time_running + |
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data->u.runstate.time_runnable + |
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data->u.runstate.time_blocked + |
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data->u.runstate.time_offline)) { |
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r = -EINVAL; |
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break; |
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} |
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if (get_kvmclock_ns(vcpu->kvm) < |
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data->u.runstate.state_entry_time) { |
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r = -EINVAL; |
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break; |
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} |
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vcpu->arch.xen.current_runstate = data->u.runstate.state; |
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vcpu->arch.xen.runstate_entry_time = |
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data->u.runstate.state_entry_time; |
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vcpu->arch.xen.runstate_times[RUNSTATE_running] = |
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data->u.runstate.time_running; |
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vcpu->arch.xen.runstate_times[RUNSTATE_runnable] = |
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data->u.runstate.time_runnable; |
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vcpu->arch.xen.runstate_times[RUNSTATE_blocked] = |
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data->u.runstate.time_blocked; |
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vcpu->arch.xen.runstate_times[RUNSTATE_offline] = |
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data->u.runstate.time_offline; |
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vcpu->arch.xen.last_steal = current->sched_info.run_delay; |
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r = 0; |
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break; |
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|
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case KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST: |
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if (!sched_info_on()) { |
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r = -EOPNOTSUPP; |
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break; |
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} |
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if (data->u.runstate.state > RUNSTATE_offline && |
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data->u.runstate.state != (u64)-1) { |
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r = -EINVAL; |
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break; |
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} |
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/* The adjustment must add up */ |
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if (data->u.runstate.state_entry_time != |
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(data->u.runstate.time_running + |
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data->u.runstate.time_runnable + |
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data->u.runstate.time_blocked + |
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data->u.runstate.time_offline)) { |
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r = -EINVAL; |
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break; |
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} |
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|
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if (get_kvmclock_ns(vcpu->kvm) < |
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(vcpu->arch.xen.runstate_entry_time + |
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data->u.runstate.state_entry_time)) { |
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r = -EINVAL; |
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break; |
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} |
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vcpu->arch.xen.runstate_entry_time += |
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data->u.runstate.state_entry_time; |
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vcpu->arch.xen.runstate_times[RUNSTATE_running] += |
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data->u.runstate.time_running; |
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vcpu->arch.xen.runstate_times[RUNSTATE_runnable] += |
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data->u.runstate.time_runnable; |
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vcpu->arch.xen.runstate_times[RUNSTATE_blocked] += |
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data->u.runstate.time_blocked; |
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vcpu->arch.xen.runstate_times[RUNSTATE_offline] += |
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data->u.runstate.time_offline; |
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|
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if (data->u.runstate.state <= RUNSTATE_offline) |
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kvm_xen_update_runstate(vcpu, data->u.runstate.state); |
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r = 0; |
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break; |
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|
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default: |
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break; |
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} |
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srcu_read_unlock(&vcpu->kvm->srcu, idx); |
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mutex_unlock(&vcpu->kvm->lock); |
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return r; |
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} |
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|
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int kvm_xen_vcpu_get_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data) |
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{ |
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int r = -ENOENT; |
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mutex_lock(&vcpu->kvm->lock); |
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switch (data->type) { |
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case KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO: |
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if (vcpu->arch.xen.vcpu_info_set) |
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data->u.gpa = vcpu->arch.xen.vcpu_info_cache.gpa; |
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else |
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data->u.gpa = GPA_INVALID; |
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r = 0; |
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break; |
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case KVM_XEN_VCPU_ATTR_TYPE_VCPU_TIME_INFO: |
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if (vcpu->arch.xen.vcpu_time_info_set) |
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data->u.gpa = vcpu->arch.xen.vcpu_time_info_cache.gpa; |
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else |
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data->u.gpa = GPA_INVALID; |
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r = 0; |
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break; |
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|
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case KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADDR: |
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if (!sched_info_on()) { |
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r = -EOPNOTSUPP; |
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break; |
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} |
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if (vcpu->arch.xen.runstate_set) { |
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data->u.gpa = vcpu->arch.xen.runstate_cache.gpa; |
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r = 0; |
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} |
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break; |
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|
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case KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_CURRENT: |
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if (!sched_info_on()) { |
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r = -EOPNOTSUPP; |
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break; |
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} |
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data->u.runstate.state = vcpu->arch.xen.current_runstate; |
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r = 0; |
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break; |
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|
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case KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_DATA: |
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if (!sched_info_on()) { |
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r = -EOPNOTSUPP; |
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break; |
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} |
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data->u.runstate.state = vcpu->arch.xen.current_runstate; |
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data->u.runstate.state_entry_time = |
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vcpu->arch.xen.runstate_entry_time; |
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data->u.runstate.time_running = |
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vcpu->arch.xen.runstate_times[RUNSTATE_running]; |
|
data->u.runstate.time_runnable = |
|
vcpu->arch.xen.runstate_times[RUNSTATE_runnable]; |
|
data->u.runstate.time_blocked = |
|
vcpu->arch.xen.runstate_times[RUNSTATE_blocked]; |
|
data->u.runstate.time_offline = |
|
vcpu->arch.xen.runstate_times[RUNSTATE_offline]; |
|
r = 0; |
|
break; |
|
|
|
case KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST: |
|
r = -EINVAL; |
|
break; |
|
|
|
default: |
|
break; |
|
} |
|
|
|
mutex_unlock(&vcpu->kvm->lock); |
|
return r; |
|
} |
|
|
|
int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data) |
|
{ |
|
struct kvm *kvm = vcpu->kvm; |
|
u32 page_num = data & ~PAGE_MASK; |
|
u64 page_addr = data & PAGE_MASK; |
|
bool lm = is_long_mode(vcpu); |
|
|
|
/* Latch long_mode for shared_info pages etc. */ |
|
vcpu->kvm->arch.xen.long_mode = lm; |
|
|
|
/* |
|
* If Xen hypercall intercept is enabled, fill the hypercall |
|
* page with VMCALL/VMMCALL instructions since that's what |
|
* we catch. Else the VMM has provided the hypercall pages |
|
* with instructions of its own choosing, so use those. |
|
*/ |
|
if (kvm_xen_hypercall_enabled(kvm)) { |
|
u8 instructions[32]; |
|
int i; |
|
|
|
if (page_num) |
|
return 1; |
|
|
|
/* mov imm32, %eax */ |
|
instructions[0] = 0xb8; |
|
|
|
/* vmcall / vmmcall */ |
|
kvm_x86_ops.patch_hypercall(vcpu, instructions + 5); |
|
|
|
/* ret */ |
|
instructions[8] = 0xc3; |
|
|
|
/* int3 to pad */ |
|
memset(instructions + 9, 0xcc, sizeof(instructions) - 9); |
|
|
|
for (i = 0; i < PAGE_SIZE / sizeof(instructions); i++) { |
|
*(u32 *)&instructions[1] = i; |
|
if (kvm_vcpu_write_guest(vcpu, |
|
page_addr + (i * sizeof(instructions)), |
|
instructions, sizeof(instructions))) |
|
return 1; |
|
} |
|
} else { |
|
/* |
|
* Note, truncation is a non-issue as 'lm' is guaranteed to be |
|
* false for a 32-bit kernel, i.e. when hva_t is only 4 bytes. |
|
*/ |
|
hva_t blob_addr = lm ? kvm->arch.xen_hvm_config.blob_addr_64 |
|
: kvm->arch.xen_hvm_config.blob_addr_32; |
|
u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64 |
|
: kvm->arch.xen_hvm_config.blob_size_32; |
|
u8 *page; |
|
|
|
if (page_num >= blob_size) |
|
return 1; |
|
|
|
blob_addr += page_num * PAGE_SIZE; |
|
|
|
page = memdup_user((u8 __user *)blob_addr, PAGE_SIZE); |
|
if (IS_ERR(page)) |
|
return PTR_ERR(page); |
|
|
|
if (kvm_vcpu_write_guest(vcpu, page_addr, page, PAGE_SIZE)) { |
|
kfree(page); |
|
return 1; |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
int kvm_xen_hvm_config(struct kvm *kvm, struct kvm_xen_hvm_config *xhc) |
|
{ |
|
if (xhc->flags & ~KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL) |
|
return -EINVAL; |
|
|
|
/* |
|
* With hypercall interception the kernel generates its own |
|
* hypercall page so it must not be provided. |
|
*/ |
|
if ((xhc->flags & KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL) && |
|
(xhc->blob_addr_32 || xhc->blob_addr_64 || |
|
xhc->blob_size_32 || xhc->blob_size_64)) |
|
return -EINVAL; |
|
|
|
mutex_lock(&kvm->lock); |
|
|
|
if (xhc->msr && !kvm->arch.xen_hvm_config.msr) |
|
static_branch_inc(&kvm_xen_enabled.key); |
|
else if (!xhc->msr && kvm->arch.xen_hvm_config.msr) |
|
static_branch_slow_dec_deferred(&kvm_xen_enabled); |
|
|
|
memcpy(&kvm->arch.xen_hvm_config, xhc, sizeof(*xhc)); |
|
|
|
mutex_unlock(&kvm->lock); |
|
return 0; |
|
} |
|
|
|
void kvm_xen_init_vm(struct kvm *kvm) |
|
{ |
|
kvm->arch.xen.shinfo_gfn = GPA_INVALID; |
|
} |
|
|
|
void kvm_xen_destroy_vm(struct kvm *kvm) |
|
{ |
|
if (kvm->arch.xen_hvm_config.msr) |
|
static_branch_slow_dec_deferred(&kvm_xen_enabled); |
|
} |
|
|
|
static int kvm_xen_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result) |
|
{ |
|
kvm_rax_write(vcpu, result); |
|
return kvm_skip_emulated_instruction(vcpu); |
|
} |
|
|
|
static int kvm_xen_hypercall_complete_userspace(struct kvm_vcpu *vcpu) |
|
{ |
|
struct kvm_run *run = vcpu->run; |
|
|
|
if (unlikely(!kvm_is_linear_rip(vcpu, vcpu->arch.xen.hypercall_rip))) |
|
return 1; |
|
|
|
return kvm_xen_hypercall_set_result(vcpu, run->xen.u.hcall.result); |
|
} |
|
|
|
int kvm_xen_hypercall(struct kvm_vcpu *vcpu) |
|
{ |
|
bool longmode; |
|
u64 input, params[6]; |
|
|
|
input = (u64)kvm_register_read(vcpu, VCPU_REGS_RAX); |
|
|
|
/* Hyper-V hypercalls get bit 31 set in EAX */ |
|
if ((input & 0x80000000) && |
|
kvm_hv_hypercall_enabled(vcpu)) |
|
return kvm_hv_hypercall(vcpu); |
|
|
|
longmode = is_64_bit_mode(vcpu); |
|
if (!longmode) { |
|
params[0] = (u32)kvm_rbx_read(vcpu); |
|
params[1] = (u32)kvm_rcx_read(vcpu); |
|
params[2] = (u32)kvm_rdx_read(vcpu); |
|
params[3] = (u32)kvm_rsi_read(vcpu); |
|
params[4] = (u32)kvm_rdi_read(vcpu); |
|
params[5] = (u32)kvm_rbp_read(vcpu); |
|
} |
|
#ifdef CONFIG_X86_64 |
|
else { |
|
params[0] = (u64)kvm_rdi_read(vcpu); |
|
params[1] = (u64)kvm_rsi_read(vcpu); |
|
params[2] = (u64)kvm_rdx_read(vcpu); |
|
params[3] = (u64)kvm_r10_read(vcpu); |
|
params[4] = (u64)kvm_r8_read(vcpu); |
|
params[5] = (u64)kvm_r9_read(vcpu); |
|
} |
|
#endif |
|
trace_kvm_xen_hypercall(input, params[0], params[1], params[2], |
|
params[3], params[4], params[5]); |
|
|
|
vcpu->run->exit_reason = KVM_EXIT_XEN; |
|
vcpu->run->xen.type = KVM_EXIT_XEN_HCALL; |
|
vcpu->run->xen.u.hcall.longmode = longmode; |
|
vcpu->run->xen.u.hcall.cpl = kvm_x86_ops.get_cpl(vcpu); |
|
vcpu->run->xen.u.hcall.input = input; |
|
vcpu->run->xen.u.hcall.params[0] = params[0]; |
|
vcpu->run->xen.u.hcall.params[1] = params[1]; |
|
vcpu->run->xen.u.hcall.params[2] = params[2]; |
|
vcpu->run->xen.u.hcall.params[3] = params[3]; |
|
vcpu->run->xen.u.hcall.params[4] = params[4]; |
|
vcpu->run->xen.u.hcall.params[5] = params[5]; |
|
vcpu->arch.xen.hypercall_rip = kvm_get_linear_rip(vcpu); |
|
vcpu->arch.complete_userspace_io = |
|
kvm_xen_hypercall_complete_userspace; |
|
|
|
return 0; |
|
}
|
|
|