diff options
| author | Paul Durrant <pdurrant@amazon.com> | 2023-01-06 10:35:59 +0000 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2023-01-24 10:05:19 -0800 |
| commit | 48639df8a9e3a1dfcb5880f77556681bd1e53657 (patch) | |
| tree | b38c535649f8f871949b02c897b8e291f938c350 /arch/x86/kvm/cpuid.c | |
| parent | ee661d8ea94e11b3452cd27c301241f2cfa95fca (diff) | |
KVM: x86/cpuid: generalize kvm_update_kvm_cpuid_base() and also capture limit
A subsequent patch will need to acquire the CPUID leaf range for emulated
Xen so explicitly pass the signature of the hypervisor we're interested in
to the new function. Also introduce a new kvm_hypervisor_cpuid structure
so we can neatly store both the base and limit leaf indices.
Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Link: https://lore.kernel.org/r/20230106103600.528-2-pdurrant@amazon.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm/cpuid.c')
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 24 |
1 files changed, 13 insertions, 11 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index d37cdab18715..c5c6eefd15c2 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -181,15 +181,15 @@ static int kvm_cpuid_check_equal(struct kvm_vcpu *vcpu, struct kvm_cpuid_entry2 return 0; } -static void kvm_update_kvm_cpuid_base(struct kvm_vcpu *vcpu) +static struct kvm_hypervisor_cpuid kvm_get_hypervisor_cpuid(struct kvm_vcpu *vcpu, + const char *sig) { - u32 function; + struct kvm_hypervisor_cpuid cpuid = {}; struct kvm_cpuid_entry2 *entry; + u32 base; - vcpu->arch.kvm_cpuid_base = 0; - - for_each_possible_hypervisor_cpuid_base(function) { - entry = kvm_find_cpuid_entry(vcpu, function); + for_each_possible_hypervisor_cpuid_base(base) { + entry = kvm_find_cpuid_entry(vcpu, base); if (entry) { u32 signature[3]; @@ -198,19 +198,21 @@ static void kvm_update_kvm_cpuid_base(struct kvm_vcpu *vcpu) signature[1] = entry->ecx; signature[2] = entry->edx; - BUILD_BUG_ON(sizeof(signature) > sizeof(KVM_SIGNATURE)); - if (!memcmp(signature, KVM_SIGNATURE, sizeof(signature))) { - vcpu->arch.kvm_cpuid_base = function; + if (!memcmp(signature, sig, sizeof(signature))) { + cpuid.base = base; + cpuid.limit = entry->eax; break; } } } + + return cpuid; } static struct kvm_cpuid_entry2 *__kvm_find_kvm_cpuid_features(struct kvm_vcpu *vcpu, struct kvm_cpuid_entry2 *entries, int nent) { - u32 base = vcpu->arch.kvm_cpuid_base; + u32 base = vcpu->arch.kvm_cpuid.base; if (!base) return NULL; @@ -440,7 +442,7 @@ static int kvm_set_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid_entry2 *e2, vcpu->arch.cpuid_entries = e2; vcpu->arch.cpuid_nent = nent; - kvm_update_kvm_cpuid_base(vcpu); + vcpu->arch.kvm_cpuid = kvm_get_hypervisor_cpuid(vcpu, KVM_SIGNATURE); kvm_vcpu_after_set_cpuid(vcpu); return 0; |