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8f2a27752e
Switch all queries (except XSAVES) of guest features from guest CPUID to guest capabilities, i.e. replace all calls to guest_cpuid_has() with calls to guest_cpu_cap_has(). Keep guest_cpuid_has() around for XSAVES, but subsume its helper guest_cpuid_get_register() and add a compile-time assertion to prevent using guest_cpuid_has() for any other feature. Add yet another comment for XSAVE to explain why KVM is allowed to query its raw guest CPUID. Opportunistically drop the unused guest_cpuid_clear(), as there should be no circumstance in which KVM needs to _clear_ a guest CPUID feature now that everything is tracked via cpu_caps. E.g. KVM may need to _change_ a feature to emulate dynamic CPUID flags, but KVM should never need to clear a feature in guest CPUID to prevent it from being used by the guest. Delete the last remnants of the governed features framework, as the lone holdout was vmx_adjust_secondary_exec_control()'s divergent behavior for governed vs. ungoverned features. Note, replacing guest_cpuid_has() checks with guest_cpu_cap_has() when computing reserved CR4 bits is a nop when viewed as a whole, as KVM's capabilities are already incorporated into the calculation, i.e. if a feature is present in guest CPUID but unsupported by KVM, its CR4 bit was already being marked as reserved, checking guest_cpu_cap_has() simply double-stamps that it's a reserved bit. Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com> Link: https://lore.kernel.org/r/20241128013424.4096668-51-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __KVM_X86_VMX_HYPERV_H
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#define __KVM_X86_VMX_HYPERV_H
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#include <linux/kvm_host.h>
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#include "vmcs12.h"
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#include "vmx.h"
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#define EVMPTR_INVALID (-1ULL)
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#define EVMPTR_MAP_PENDING (-2ULL)
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enum nested_evmptrld_status {
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EVMPTRLD_DISABLED,
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EVMPTRLD_SUCCEEDED,
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EVMPTRLD_VMFAIL,
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EVMPTRLD_ERROR,
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};
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#ifdef CONFIG_KVM_HYPERV
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static inline bool evmptr_is_valid(u64 evmptr)
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{
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return evmptr != EVMPTR_INVALID && evmptr != EVMPTR_MAP_PENDING;
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}
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static inline bool nested_vmx_is_evmptr12_valid(struct vcpu_vmx *vmx)
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{
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return evmptr_is_valid(vmx->nested.hv_evmcs_vmptr);
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}
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static inline bool evmptr_is_set(u64 evmptr)
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{
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return evmptr != EVMPTR_INVALID;
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}
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static inline bool nested_vmx_is_evmptr12_set(struct vcpu_vmx *vmx)
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{
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return evmptr_is_set(vmx->nested.hv_evmcs_vmptr);
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}
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static inline struct hv_enlightened_vmcs *nested_vmx_evmcs(struct vcpu_vmx *vmx)
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{
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return vmx->nested.hv_evmcs;
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}
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static inline bool guest_cpu_cap_has_evmcs(struct kvm_vcpu *vcpu)
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{
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/*
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* eVMCS is exposed to the guest if Hyper-V is enabled in CPUID and
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* eVMCS has been explicitly enabled by userspace.
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*/
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return vcpu->arch.hyperv_enabled &&
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to_vmx(vcpu)->nested.enlightened_vmcs_enabled;
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}
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u64 nested_get_evmptr(struct kvm_vcpu *vcpu);
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uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu);
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int nested_enable_evmcs(struct kvm_vcpu *vcpu,
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uint16_t *vmcs_version);
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void nested_evmcs_filter_control_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
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int nested_evmcs_check_controls(struct vmcs12 *vmcs12);
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bool nested_evmcs_l2_tlb_flush_enabled(struct kvm_vcpu *vcpu);
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void vmx_hv_inject_synthetic_vmexit_post_tlb_flush(struct kvm_vcpu *vcpu);
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#else
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static inline bool evmptr_is_valid(u64 evmptr)
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{
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return false;
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}
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static inline bool nested_vmx_is_evmptr12_valid(struct vcpu_vmx *vmx)
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{
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return false;
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}
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static inline bool evmptr_is_set(u64 evmptr)
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{
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return false;
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}
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static inline bool nested_vmx_is_evmptr12_set(struct vcpu_vmx *vmx)
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{
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return false;
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}
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static inline struct hv_enlightened_vmcs *nested_vmx_evmcs(struct vcpu_vmx *vmx)
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{
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return NULL;
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}
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#endif
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#endif /* __KVM_X86_VMX_HYPERV_H */
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