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KVM: x86: Add supported_vm_types to kvm_caps

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This simplifies the implementation of KVM_CHECK_EXTENSION(KVM_CAP_VM_TYPES),
and also allows the vendor module to specify which VM types are supported.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20240404121327.3107131-9-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2024-04-04 08:13:18 -04:00
parent 517987e3fb
commit 2a955c4db1
2 changed files with 8 additions and 6 deletions
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12
arch/x86/kvm/x86.c
View file

@ -94,6 +94,7 @@
struct kvm_caps kvm_caps __read_mostly = {
.supported_mce_cap = MCG_CTL_P | MCG_SER_P,
.supported_vm_types = BIT(KVM_X86_DEFAULT_VM),
};
EXPORT_SYMBOL_GPL(kvm_caps);
@ -4629,9 +4630,7 @@ static int kvm_ioctl_get_supported_hv_cpuid(struct kvm_vcpu *vcpu,
static bool kvm_is_vm_type_supported(unsigned long type)
{
return type == KVM_X86_DEFAULT_VM ||
(type == KVM_X86_SW_PROTECTED_VM &&
IS_ENABLED(CONFIG_KVM_SW_PROTECTED_VM) && tdp_mmu_enabled);
return type < 32 && (kvm_caps.supported_vm_types & BIT(type));
}
int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
@ -4832,9 +4831,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
r = kvm_caps.has_notify_vmexit;
break;
case KVM_CAP_VM_TYPES:
r = BIT(KVM_X86_DEFAULT_VM);
if (kvm_is_vm_type_supported(KVM_X86_SW_PROTECTED_VM))
r |= BIT(KVM_X86_SW_PROTECTED_VM);
r = kvm_caps.supported_vm_types;
break;
default:
break;
@ -9824,6 +9821,9 @@ int kvm_x86_vendor_init(struct kvm_x86_init_ops *ops)
kvm_register_perf_callbacks(ops->handle_intel_pt_intr);
if (IS_ENABLED(CONFIG_KVM_SW_PROTECTED_VM) && tdp_mmu_enabled)
kvm_caps.supported_vm_types |= BIT(KVM_X86_SW_PROTECTED_VM);
if (!kvm_cpu_cap_has(X86_FEATURE_XSAVES))
kvm_caps.supported_xss = 0;

2
arch/x86/kvm/x86.h
View file

@ -24,6 +24,8 @@ struct kvm_caps {
bool has_bus_lock_exit;
/* notify VM exit supported? */
bool has_notify_vmexit;
/* bit mask of VM types */
u32 supported_vm_types;
u64 supported_mce_cap;
u64 supported_xcr0;