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397 lines
14 KiB
397 lines
14 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* access guest memory |
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* |
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* Copyright IBM Corp. 2008, 2014 |
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* |
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* Author(s): Carsten Otte <[email protected]> |
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*/ |
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#ifndef __KVM_S390_GACCESS_H |
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#define __KVM_S390_GACCESS_H |
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#include <linux/compiler.h> |
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#include <linux/kvm_host.h> |
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#include <linux/uaccess.h> |
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#include <linux/ptrace.h> |
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#include "kvm-s390.h" |
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/** |
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* kvm_s390_real_to_abs - convert guest real address to guest absolute address |
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* @prefix - guest prefix |
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* @gra - guest real address |
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* |
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* Returns the guest absolute address that corresponds to the passed guest real |
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* address @gra of by applying the given prefix. |
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*/ |
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static inline unsigned long _kvm_s390_real_to_abs(u32 prefix, unsigned long gra) |
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{ |
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if (gra < 2 * PAGE_SIZE) |
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gra += prefix; |
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else if (gra >= prefix && gra < prefix + 2 * PAGE_SIZE) |
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gra -= prefix; |
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return gra; |
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} |
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/** |
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* kvm_s390_real_to_abs - convert guest real address to guest absolute address |
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* @vcpu - guest virtual cpu |
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* @gra - guest real address |
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* |
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* Returns the guest absolute address that corresponds to the passed guest real |
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* address @gra of a virtual guest cpu by applying its prefix. |
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*/ |
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static inline unsigned long kvm_s390_real_to_abs(struct kvm_vcpu *vcpu, |
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unsigned long gra) |
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{ |
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return _kvm_s390_real_to_abs(kvm_s390_get_prefix(vcpu), gra); |
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} |
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/** |
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* _kvm_s390_logical_to_effective - convert guest logical to effective address |
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* @psw: psw of the guest |
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* @ga: guest logical address |
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* |
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* Convert a guest logical address to an effective address by applying the |
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* rules of the addressing mode defined by bits 31 and 32 of the given PSW |
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* (extendended/basic addressing mode). |
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* |
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* Depending on the addressing mode, the upper 40 bits (24 bit addressing |
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* mode), 33 bits (31 bit addressing mode) or no bits (64 bit addressing |
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* mode) of @ga will be zeroed and the remaining bits will be returned. |
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*/ |
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static inline unsigned long _kvm_s390_logical_to_effective(psw_t *psw, |
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unsigned long ga) |
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{ |
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if (psw_bits(*psw).eaba == PSW_BITS_AMODE_64BIT) |
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return ga; |
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if (psw_bits(*psw).eaba == PSW_BITS_AMODE_31BIT) |
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return ga & ((1UL << 31) - 1); |
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return ga & ((1UL << 24) - 1); |
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} |
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/** |
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* kvm_s390_logical_to_effective - convert guest logical to effective address |
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* @vcpu: guest virtual cpu |
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* @ga: guest logical address |
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* |
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* Convert a guest vcpu logical address to a guest vcpu effective address by |
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* applying the rules of the vcpu's addressing mode defined by PSW bits 31 |
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* and 32 (extendended/basic addressing mode). |
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* |
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* Depending on the vcpu's addressing mode the upper 40 bits (24 bit addressing |
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* mode), 33 bits (31 bit addressing mode) or no bits (64 bit addressing mode) |
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* of @ga will be zeroed and the remaining bits will be returned. |
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*/ |
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static inline unsigned long kvm_s390_logical_to_effective(struct kvm_vcpu *vcpu, |
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unsigned long ga) |
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{ |
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return _kvm_s390_logical_to_effective(&vcpu->arch.sie_block->gpsw, ga); |
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} |
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/* |
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* put_guest_lc, read_guest_lc and write_guest_lc are guest access functions |
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* which shall only be used to access the lowcore of a vcpu. |
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* These functions should be used for e.g. interrupt handlers where no |
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* guest memory access protection facilities, like key or low address |
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* protection, are applicable. |
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* At a later point guest vcpu lowcore access should happen via pinned |
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* prefix pages, so that these pages can be accessed directly via the |
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* kernel mapping. All of these *_lc functions can be removed then. |
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*/ |
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/** |
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* put_guest_lc - write a simple variable to a guest vcpu's lowcore |
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* @vcpu: virtual cpu |
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* @x: value to copy to guest |
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* @gra: vcpu's destination guest real address |
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* |
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* Copies a simple value from kernel space to a guest vcpu's lowcore. |
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* The size of the variable may be 1, 2, 4 or 8 bytes. The destination |
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* must be located in the vcpu's lowcore. Otherwise the result is undefined. |
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* |
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* Returns zero on success or -EFAULT on error. |
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* |
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* Note: an error indicates that either the kernel is out of memory or |
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* the guest memory mapping is broken. In any case the best solution |
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* would be to terminate the guest. |
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* It is wrong to inject a guest exception. |
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*/ |
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#define put_guest_lc(vcpu, x, gra) \ |
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({ \ |
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struct kvm_vcpu *__vcpu = (vcpu); \ |
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__typeof__(*(gra)) __x = (x); \ |
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unsigned long __gpa; \ |
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\ |
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__gpa = (unsigned long)(gra); \ |
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__gpa += kvm_s390_get_prefix(__vcpu); \ |
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kvm_write_guest(__vcpu->kvm, __gpa, &__x, sizeof(__x)); \ |
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}) |
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/** |
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* write_guest_lc - copy data from kernel space to guest vcpu's lowcore |
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* @vcpu: virtual cpu |
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* @gra: vcpu's source guest real address |
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* @data: source address in kernel space |
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* @len: number of bytes to copy |
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* |
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* Copy data from kernel space to guest vcpu's lowcore. The entire range must |
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* be located within the vcpu's lowcore, otherwise the result is undefined. |
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* |
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* Returns zero on success or -EFAULT on error. |
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* |
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* Note: an error indicates that either the kernel is out of memory or |
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* the guest memory mapping is broken. In any case the best solution |
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* would be to terminate the guest. |
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* It is wrong to inject a guest exception. |
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*/ |
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static inline __must_check |
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int write_guest_lc(struct kvm_vcpu *vcpu, unsigned long gra, void *data, |
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unsigned long len) |
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{ |
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unsigned long gpa = gra + kvm_s390_get_prefix(vcpu); |
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return kvm_write_guest(vcpu->kvm, gpa, data, len); |
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} |
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/** |
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* read_guest_lc - copy data from guest vcpu's lowcore to kernel space |
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* @vcpu: virtual cpu |
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* @gra: vcpu's source guest real address |
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* @data: destination address in kernel space |
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* @len: number of bytes to copy |
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* |
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* Copy data from guest vcpu's lowcore to kernel space. The entire range must |
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* be located within the vcpu's lowcore, otherwise the result is undefined. |
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* |
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* Returns zero on success or -EFAULT on error. |
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* |
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* Note: an error indicates that either the kernel is out of memory or |
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* the guest memory mapping is broken. In any case the best solution |
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* would be to terminate the guest. |
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* It is wrong to inject a guest exception. |
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*/ |
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static inline __must_check |
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int read_guest_lc(struct kvm_vcpu *vcpu, unsigned long gra, void *data, |
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unsigned long len) |
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{ |
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unsigned long gpa = gra + kvm_s390_get_prefix(vcpu); |
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return kvm_read_guest(vcpu->kvm, gpa, data, len); |
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} |
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enum gacc_mode { |
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GACC_FETCH, |
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GACC_STORE, |
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GACC_IFETCH, |
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}; |
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int guest_translate_address(struct kvm_vcpu *vcpu, unsigned long gva, |
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u8 ar, unsigned long *gpa, enum gacc_mode mode); |
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int check_gva_range(struct kvm_vcpu *vcpu, unsigned long gva, u8 ar, |
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unsigned long length, enum gacc_mode mode); |
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int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, void *data, |
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unsigned long len, enum gacc_mode mode); |
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int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra, |
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void *data, unsigned long len, enum gacc_mode mode); |
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/** |
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* write_guest - copy data from kernel space to guest space |
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* @vcpu: virtual cpu |
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* @ga: guest address |
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* @ar: access register |
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* @data: source address in kernel space |
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* @len: number of bytes to copy |
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* |
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* Copy @len bytes from @data (kernel space) to @ga (guest address). |
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* In order to copy data to guest space the PSW of the vcpu is inspected: |
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* If DAT is off data will be copied to guest real or absolute memory. |
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* If DAT is on data will be copied to the address space as specified by |
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* the address space bits of the PSW: |
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* Primary, secondary, home space or access register mode. |
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* The addressing mode of the PSW is also inspected, so that address wrap |
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* around is taken into account for 24-, 31- and 64-bit addressing mode, |
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* if the to be copied data crosses page boundaries in guest address space. |
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* In addition also low address and DAT protection are inspected before |
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* copying any data (key protection is currently not implemented). |
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* |
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* This function modifies the 'struct kvm_s390_pgm_info pgm' member of @vcpu. |
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* In case of an access exception (e.g. protection exception) pgm will contain |
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* all data necessary so that a subsequent call to 'kvm_s390_inject_prog_vcpu()' |
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* will inject a correct exception into the guest. |
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* If no access exception happened, the contents of pgm are undefined when |
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* this function returns. |
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* |
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* Returns: - zero on success |
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* - a negative value if e.g. the guest mapping is broken or in |
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* case of out-of-memory. In this case the contents of pgm are |
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* undefined. Also parts of @data may have been copied to guest |
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* space. |
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* - a positive value if an access exception happened. In this case |
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* the returned value is the program interruption code and the |
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* contents of pgm may be used to inject an exception into the |
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* guest. No data has been copied to guest space. |
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* |
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* Note: in case an access exception is recognized no data has been copied to |
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* guest space (this is also true, if the to be copied data would cross |
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* one or more page boundaries in guest space). |
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* Therefore this function may be used for nullifying and suppressing |
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* instruction emulation. |
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* It may also be used for terminating instructions, if it is undefined |
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* if data has been changed in guest space in case of an exception. |
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*/ |
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static inline __must_check |
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int write_guest(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, void *data, |
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unsigned long len) |
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{ |
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return access_guest(vcpu, ga, ar, data, len, GACC_STORE); |
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} |
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/** |
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* read_guest - copy data from guest space to kernel space |
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* @vcpu: virtual cpu |
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* @ga: guest address |
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* @ar: access register |
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* @data: destination address in kernel space |
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* @len: number of bytes to copy |
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* |
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* Copy @len bytes from @ga (guest address) to @data (kernel space). |
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* |
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* The behaviour of read_guest is identical to write_guest, except that |
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* data will be copied from guest space to kernel space. |
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*/ |
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static inline __must_check |
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int read_guest(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, void *data, |
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unsigned long len) |
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{ |
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return access_guest(vcpu, ga, ar, data, len, GACC_FETCH); |
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} |
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/** |
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* read_guest_instr - copy instruction data from guest space to kernel space |
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* @vcpu: virtual cpu |
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* @ga: guest address |
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* @data: destination address in kernel space |
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* @len: number of bytes to copy |
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* |
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* Copy @len bytes from the given address (guest space) to @data (kernel |
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* space). |
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* |
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* The behaviour of read_guest_instr is identical to read_guest, except that |
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* instruction data will be read from primary space when in home-space or |
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* address-space mode. |
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*/ |
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static inline __must_check |
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int read_guest_instr(struct kvm_vcpu *vcpu, unsigned long ga, void *data, |
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unsigned long len) |
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{ |
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return access_guest(vcpu, ga, 0, data, len, GACC_IFETCH); |
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} |
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/** |
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* write_guest_abs - copy data from kernel space to guest space absolute |
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* @vcpu: virtual cpu |
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* @gpa: guest physical (absolute) address |
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* @data: source address in kernel space |
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* @len: number of bytes to copy |
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* |
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* Copy @len bytes from @data (kernel space) to @gpa (guest absolute address). |
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* It is up to the caller to ensure that the entire guest memory range is |
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* valid memory before calling this function. |
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* Guest low address and key protection are not checked. |
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* |
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* Returns zero on success or -EFAULT on error. |
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* |
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* If an error occurs data may have been copied partially to guest memory. |
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*/ |
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static inline __must_check |
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int write_guest_abs(struct kvm_vcpu *vcpu, unsigned long gpa, void *data, |
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unsigned long len) |
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{ |
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return kvm_write_guest(vcpu->kvm, gpa, data, len); |
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} |
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/** |
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* read_guest_abs - copy data from guest space absolute to kernel space |
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* @vcpu: virtual cpu |
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* @gpa: guest physical (absolute) address |
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* @data: destination address in kernel space |
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* @len: number of bytes to copy |
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* |
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* Copy @len bytes from @gpa (guest absolute address) to @data (kernel space). |
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* It is up to the caller to ensure that the entire guest memory range is |
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* valid memory before calling this function. |
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* Guest key protection is not checked. |
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* |
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* Returns zero on success or -EFAULT on error. |
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* |
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* If an error occurs data may have been copied partially to kernel space. |
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*/ |
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static inline __must_check |
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int read_guest_abs(struct kvm_vcpu *vcpu, unsigned long gpa, void *data, |
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unsigned long len) |
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{ |
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return kvm_read_guest(vcpu->kvm, gpa, data, len); |
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} |
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/** |
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* write_guest_real - copy data from kernel space to guest space real |
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* @vcpu: virtual cpu |
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* @gra: guest real address |
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* @data: source address in kernel space |
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* @len: number of bytes to copy |
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* |
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* Copy @len bytes from @data (kernel space) to @gra (guest real address). |
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* It is up to the caller to ensure that the entire guest memory range is |
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* valid memory before calling this function. |
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* Guest low address and key protection are not checked. |
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* |
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* Returns zero on success or -EFAULT on error. |
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* |
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* If an error occurs data may have been copied partially to guest memory. |
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*/ |
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static inline __must_check |
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int write_guest_real(struct kvm_vcpu *vcpu, unsigned long gra, void *data, |
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unsigned long len) |
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{ |
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return access_guest_real(vcpu, gra, data, len, 1); |
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} |
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/** |
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* read_guest_real - copy data from guest space real to kernel space |
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* @vcpu: virtual cpu |
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* @gra: guest real address |
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* @data: destination address in kernel space |
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* @len: number of bytes to copy |
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* |
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* Copy @len bytes from @gra (guest real address) to @data (kernel space). |
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* It is up to the caller to ensure that the entire guest memory range is |
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* valid memory before calling this function. |
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* Guest key protection is not checked. |
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* |
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* Returns zero on success or -EFAULT on error. |
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* |
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* If an error occurs data may have been copied partially to kernel space. |
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*/ |
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static inline __must_check |
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int read_guest_real(struct kvm_vcpu *vcpu, unsigned long gra, void *data, |
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unsigned long len) |
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{ |
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return access_guest_real(vcpu, gra, data, len, 0); |
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} |
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void ipte_lock(struct kvm_vcpu *vcpu); |
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void ipte_unlock(struct kvm_vcpu *vcpu); |
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int ipte_lock_held(struct kvm_vcpu *vcpu); |
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int kvm_s390_check_low_addr_prot_real(struct kvm_vcpu *vcpu, unsigned long gra); |
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/* MVPG PEI indication bits */ |
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#define PEI_DAT_PROT 2 |
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#define PEI_NOT_PTE 4 |
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int kvm_s390_shadow_fault(struct kvm_vcpu *vcpu, struct gmap *shadow, |
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unsigned long saddr, unsigned long *datptr); |
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#endif /* __KVM_S390_GACCESS_H */
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