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Diffstat (limited to 'arch/x86/kvm/msrs.h')
| -rw-r--r-- | arch/x86/kvm/msrs.h | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/arch/x86/kvm/msrs.h b/arch/x86/kvm/msrs.h new file mode 100644 index 000000000..7cc182a15 --- /dev/null +++ b/arch/x86/kvm/msrs.h @@ -0,0 +1,155 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef ARCH_X86_KVM_MSRS_H +#define ARCH_X86_KVM_MSRS_H + +#include <linux/kvm_host.h> +#include <linux/user-return-notifier.h> + +#include "cpuid.h" +#include "regs.h" + +extern bool report_ignored_msrs; +extern bool ignore_msrs; + +extern u32 __read_mostly kvm_nr_uret_msrs; + +static inline void kvm_pr_unimpl_wrmsr(struct kvm_vcpu *vcpu, u32 msr, u64 data) +{ + if (report_ignored_msrs) + vcpu_unimpl(vcpu, "Unhandled WRMSR(0x%x) = 0x%llx\n", msr, data); +} + +static inline void kvm_pr_unimpl_rdmsr(struct kvm_vcpu *vcpu, u32 msr) +{ + if (report_ignored_msrs) + vcpu_unimpl(vcpu, "Unhandled RDMSR(0x%x)\n", msr); +} + +/* + * The first...last VMX feature MSRs that are emulated by KVM. This may or may + * not cover all known VMX MSRs, as KVM doesn't emulate an MSR until there's an + * associated feature that KVM supports for nested virtualization. + */ +#define KVM_FIRST_EMULATED_VMX_MSR MSR_IA32_VMX_BASIC +#define KVM_LAST_EMULATED_VMX_MSR MSR_IA32_VMX_VMFUNC + +/* + * KVM's internal, non-ABI indices for synthetic MSRs. The values themselves + * are arbitrary and have no meaning, the only requirement is that they don't + * conflict with "real" MSRs that KVM supports. Use values at the upper end + * of KVM's reserved paravirtual MSR range to minimize churn, i.e. these values + * will be usable until KVM exhausts its supply of paravirtual MSR indices. + */ +#define MSR_KVM_INTERNAL_GUEST_SSP 0x4b564dff + +#define MSR_IA32_CR_PAT_DEFAULT \ + PAT_VALUE(WB, WT, UC_MINUS, UC, WB, WT, UC_MINUS, UC) + +void kvm_init_msr_lists(void); +int kvm_get_msr_index_list(struct kvm_msr_list __user *user_msr_list); +int kvm_get_feature_msr_index_list(struct kvm_msr_list __user *user_msr_list); +int kvm_get_feature_msrs(struct kvm_msrs __user *user_msrs); + +int kvm_get_msrs(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs); +int kvm_set_msrs(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs); + +int kvm_get_set_one_reg(struct kvm_vcpu *vcpu, unsigned int ioctl, + void __user *argp); +int kvm_get_reg_list(struct kvm_vcpu *vcpu, + struct kvm_reg_list __user *user_list); + +bool kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer); +int kvm_emulate_msr_read(struct kvm_vcpu *vcpu, u32 index, u64 *data); +int kvm_emulate_msr_write(struct kvm_vcpu *vcpu, u32 index, u64 data); +int __kvm_emulate_msr_read(struct kvm_vcpu *vcpu, u32 index, u64 *data); +int __kvm_emulate_msr_write(struct kvm_vcpu *vcpu, u32 index, u64 data); +int kvm_msr_read(struct kvm_vcpu *vcpu, u32 index, u64 *data); +int kvm_msr_write(struct kvm_vcpu *vcpu, u32 index, u64 data); +int kvm_emulate_rdmsr(struct kvm_vcpu *vcpu); +int kvm_emulate_rdmsr_imm(struct kvm_vcpu *vcpu, u32 msr, int reg); +int kvm_emulate_wrmsr(struct kvm_vcpu *vcpu); +int kvm_emulate_wrmsr_imm(struct kvm_vcpu *vcpu, u32 msr, int reg); + +fastpath_t handle_fastpath_wrmsr(struct kvm_vcpu *vcpu); +fastpath_t handle_fastpath_wrmsr_imm(struct kvm_vcpu *vcpu, u32 msr, int reg); + +int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr); +int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr); + +int kvm_add_user_return_msr(u32 msr); +int kvm_find_user_return_msr(u32 msr); +int kvm_set_user_return_msr(unsigned index, u64 val, u64 mask); +u64 kvm_get_user_return_msr(unsigned int slot); + +static inline bool kvm_is_supported_user_return_msr(u32 msr) +{ + return kvm_find_user_return_msr(msr) >= 0; +} + +void kvm_user_return_msr_cpu_online(void); +void drop_user_return_notifiers(void); +void kvm_destroy_user_return_msrs(void); + +int kvm_emulator_get_msr_with_filter(struct kvm_vcpu *vcpu, u32 msr_index, + u64 *pdata); +int kvm_emulator_set_msr_with_filter(struct kvm_vcpu *vcpu, u32 msr_index, + u64 data); +int kvm_emulator_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata); + +bool kvm_msr_allowed(struct kvm_vcpu *vcpu, u32 index, u32 type); + +enum kvm_msr_access { + MSR_TYPE_R = BIT(0), + MSR_TYPE_W = BIT(1), + MSR_TYPE_RW = MSR_TYPE_R | MSR_TYPE_W, +}; + +/* + * Internal error codes that are used to indicate that MSR emulation encountered + * an error that should result in #GP in the guest, unless userspace handles it. + * Note, '1', '0', and negative numbers are off limits, as they are used by KVM + * as part of KVM's lightly documented internal KVM_RUN return codes. + * + * UNSUPPORTED - The MSR isn't supported, either because it is completely + * unknown to KVM, or because the MSR should not exist according + * to the vCPU model. + * + * FILTERED - Access to the MSR is denied by a userspace MSR filter. + */ +#define KVM_MSR_RET_UNSUPPORTED 2 +#define KVM_MSR_RET_FILTERED 3 + +int kvm_vm_ioctl_set_msr_filter(struct kvm *kvm, struct kvm_msr_filter *filter); +void kvm_free_msr_filter(struct kvm_x86_msr_filter *msr_filter); + +int kvm_mtrr_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data); +int kvm_mtrr_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata); + +u64 kvm_get_arch_capabilities(void); +int kvm_spec_ctrl_test_value(u64 value); + +#define CET_US_RESERVED_BITS GENMASK(9, 6) +#define CET_US_SHSTK_MASK_BITS GENMASK(1, 0) +#define CET_US_IBT_MASK_BITS (GENMASK_ULL(5, 2) | GENMASK_ULL(63, 10)) +#define CET_US_LEGACY_BITMAP_BASE(data) ((data) >> 12) + +static inline bool kvm_is_valid_u_s_cet(struct kvm_vcpu *vcpu, u64 data) +{ + if (data & CET_US_RESERVED_BITS) + return false; + if (!guest_cpu_cap_has(vcpu, X86_FEATURE_SHSTK) && + (data & CET_US_SHSTK_MASK_BITS)) + return false; + if (!guest_cpu_cap_has(vcpu, X86_FEATURE_IBT) && + (data & CET_US_IBT_MASK_BITS)) + return false; + if (!IS_ALIGNED(CET_US_LEGACY_BITMAP_BASE(data), 4)) + return false; + /* IBT can be suppressed iff the TRACKER isn't WAIT_ENDBR. */ + if ((data & CET_SUPPRESS) && (data & CET_WAIT_ENDBR)) + return false; + + return true; +} + +#endif |