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x86/kvm/hyper-v: Introduce nested_get_evmcs_version() helper

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The upcoming KVM_GET_SUPPORTED_HV_CPUID ioctl will need to return
Enlightened VMCS version in HYPERV_CPUID_NESTED_FEATURES.EAX when
it was enabled.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2018-12-10 18:21:55 +01:00 committed by Paolo Bonzini
parent 220d6586ec
commit e2e871ab2f
5 changed files with 26 additions and 7 deletions
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1
arch/x86/include/asm/kvm_host.h
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@ -1186,6 +1186,7 @@ struct kvm_x86_ops {
int (*nested_enable_evmcs)(struct kvm_vcpu *vcpu,
uint16_t *vmcs_version);
uint16_t (*nested_get_evmcs_version)(struct kvm_vcpu *vcpu);
};
struct kvm_arch_async_pf {

7
arch/x86/kvm/svm.c
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@ -7047,6 +7047,12 @@ static int svm_unregister_enc_region(struct kvm *kvm,
return ret;
}
static uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu)
{
/* Not supported */
return 0;
}
static int nested_enable_evmcs(struct kvm_vcpu *vcpu,
uint16_t *vmcs_version)
{
@ -7185,6 +7191,7 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.mem_enc_unreg_region = svm_unregister_enc_region,
.nested_enable_evmcs = nested_enable_evmcs,
.nested_get_evmcs_version = nested_get_evmcs_version,
};
static int __init svm_init(void)

23
arch/x86/kvm/vmx/evmcs.c
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@ -313,19 +313,28 @@ void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf)
}
#endif
uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
/*
* vmcs_version represents the range of supported Enlightened VMCS
* versions: lower 8 bits is the minimal version, higher 8 bits is the
* maximum supported version. KVM supports versions from 1 to
* KVM_EVMCS_VERSION.
*/
if (vmx->nested.enlightened_vmcs_enabled)
return (KVM_EVMCS_VERSION << 8) | 1;
return 0;
}
int nested_enable_evmcs(struct kvm_vcpu *vcpu,
uint16_t *vmcs_version)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
/*
* vmcs_version represents the range of supported Enlightened VMCS
* versions: lower 8 bits is the minimal version, higher 8 bits is the
* maximum supported version. KVM supports versions from 1 to
* KVM_EVMCS_VERSION.
*/
if (vmcs_version)
*vmcs_version = (KVM_EVMCS_VERSION << 8) | 1;
*vmcs_version = nested_get_evmcs_version(vcpu);
/* We don't support disabling the feature for simplicity. */
if (vmx->nested.enlightened_vmcs_enabled)

1
arch/x86/kvm/vmx/evmcs.h
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@ -195,6 +195,7 @@ static inline void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf) {}
static inline void evmcs_touch_msr_bitmap(void) {}
#endif /* IS_ENABLED(CONFIG_HYPERV) */
uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu);
int nested_enable_evmcs(struct kvm_vcpu *vcpu,
uint16_t *vmcs_version);

1
arch/x86/kvm/vmx/nested.c
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@ -5669,6 +5669,7 @@ __init int nested_vmx_hardware_setup(int (*exit_handlers[])(struct kvm_vcpu *))
kvm_x86_ops->set_nested_state = vmx_set_nested_state;
kvm_x86_ops->get_vmcs12_pages = nested_get_vmcs12_pages,
kvm_x86_ops->nested_enable_evmcs = nested_enable_evmcs;
kvm_x86_ops->nested_get_evmcs_version = nested_get_evmcs_version;
return 0;
}