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KVM: SEV: define VM types for SEV and SEV-ES

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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20240404121327.3107131-11-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2024-04-04 08:13:20 -04:00
parent 4ebb105e6c
commit 26c44aa9e0
5 changed files with 29 additions and 3 deletions
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2
Documentation/virt/kvm/api.rst
View File

@ -8819,6 +8819,8 @@ means the VM type with value @n is supported. Possible values of @n are::
#define KVM_X86_DEFAULT_VM 0
#define KVM_X86_SW_PROTECTED_VM 1
#define KVM_X86_SEV_VM 2
#define KVM_X86_SEV_ES_VM 3
Note, KVM_X86_SW_PROTECTED_VM is currently only for development and testing.
Do not use KVM_X86_SW_PROTECTED_VM for "real" VMs, and especially not in

2
arch/x86/include/uapi/asm/kvm.h
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@ -861,5 +861,7 @@ struct kvm_hyperv_eventfd {
#define KVM_X86_DEFAULT_VM 0
#define KVM_X86_SW_PROTECTED_VM 1
#define KVM_X86_SEV_VM 2
#define KVM_X86_SEV_ES_VM 3
#endif /* _ASM_X86_KVM_H */

16
arch/x86/kvm/svm/sev.c
View File

@ -251,6 +251,9 @@ static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp)
if (kvm->created_vcpus)
return -EINVAL;
if (kvm->arch.vm_type != KVM_X86_DEFAULT_VM)
return -EINVAL;
if (unlikely(sev->active))
return -EINVAL;
@ -272,6 +275,7 @@ static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp)
INIT_LIST_HEAD(&sev->regions_list);
INIT_LIST_HEAD(&sev->mirror_vms);
sev->need_init = false;
kvm_set_apicv_inhibit(kvm, APICV_INHIBIT_REASON_SEV);
@ -1808,7 +1812,8 @@ int sev_vm_move_enc_context_from(struct kvm *kvm, unsigned int source_fd)
if (ret)
goto out_fput;
if (sev_guest(kvm) || !sev_guest(source_kvm)) {
if (kvm->arch.vm_type != source_kvm->arch.vm_type ||
sev_guest(kvm) || !sev_guest(source_kvm)) {
ret = -EINVAL;
goto out_unlock;
}
@ -2132,6 +2137,7 @@ int sev_vm_copy_enc_context_from(struct kvm *kvm, unsigned int source_fd)
mirror_sev->asid = source_sev->asid;
mirror_sev->fd = source_sev->fd;
mirror_sev->es_active = source_sev->es_active;
mirror_sev->need_init = false;
mirror_sev->handle = source_sev->handle;
INIT_LIST_HEAD(&mirror_sev->regions_list);
INIT_LIST_HEAD(&mirror_sev->mirror_vms);
@ -2197,10 +2203,14 @@ void sev_vm_destroy(struct kvm *kvm)
void __init sev_set_cpu_caps(void)
{
if (sev_enabled)
if (sev_enabled) {
kvm_cpu_cap_set(X86_FEATURE_SEV);
if (sev_es_enabled)
kvm_caps.supported_vm_types |= BIT(KVM_X86_SEV_VM);
}
if (sev_es_enabled) {
kvm_cpu_cap_set(X86_FEATURE_SEV_ES);
kvm_caps.supported_vm_types |= BIT(KVM_X86_SEV_ES_VM);
}
}
void __init sev_hardware_setup(void)

11
arch/x86/kvm/svm/svm.c
View File

@ -4086,6 +4086,9 @@ static void svm_cancel_injection(struct kvm_vcpu *vcpu)
static int svm_vcpu_pre_run(struct kvm_vcpu *vcpu)
{
if (to_kvm_sev_info(vcpu->kvm)->need_init)
return -EINVAL;
return 1;
}
@ -4891,6 +4894,14 @@ static void svm_vm_destroy(struct kvm *kvm)
static int svm_vm_init(struct kvm *kvm)
{
int type = kvm->arch.vm_type;
if (type != KVM_X86_DEFAULT_VM &&
type != KVM_X86_SW_PROTECTED_VM) {
kvm->arch.has_protected_state = (type == KVM_X86_SEV_ES_VM);
to_kvm_sev_info(kvm)->need_init = true;
}
if (!pause_filter_count || !pause_filter_thresh)
kvm->arch.pause_in_guest = true;

1
arch/x86/kvm/svm/svm.h
View File

@ -79,6 +79,7 @@ enum {
struct kvm_sev_info {
bool active; /* SEV enabled guest */
bool es_active; /* SEV-ES enabled guest */
bool need_init; /* waiting for SEV_INIT2 */
unsigned int asid; /* ASID used for this guest */
unsigned int handle; /* SEV firmware handle */
int fd; /* SEV device fd */