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