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Message-Id: <20240223104009.632194-10-pbonzini@redhat.com>
Date: Fri, 23 Feb 2024 05:40:07 -0500
From: Paolo Bonzini <pbonzini@...hat.com>
To: linux-kernel@...r.kernel.org,
kvm@...r.kernel.org
Cc: seanjc@...gle.com,
michael.roth@....com,
aik@....com
Subject: [PATCH v2 09/11] KVM: SEV: define VM types for SEV and SEV-ES
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Message-Id: <20240209183743.22030-9-pbonzini@...hat.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
Documentation/virt/kvm/api.rst | 2 ++
arch/x86/include/uapi/asm/kvm.h | 2 ++
arch/x86/kvm/svm/sev.c | 21 ++++++++++++++++++++-
arch/x86/kvm/svm/svm.c | 11 +++++++++++
arch/x86/kvm/svm/svm.h | 2 ++
arch/x86/kvm/x86.c | 4 ++++
6 files changed, 41 insertions(+), 1 deletion(-)
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 3ec0b7a455a0..bf957bb70e4b 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -8790,6 +8790,8 @@ 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 8
+ #define KVM_X86_SEV_ES_VM 10
9. Known KVM API problems
=========================
diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h
index cccaa5ff6d01..12cf6f3b367e 100644
--- a/arch/x86/include/uapi/asm/kvm.h
+++ b/arch/x86/include/uapi/asm/kvm.h
@@ -850,5 +850,7 @@ struct kvm_hyperv_eventfd {
#define KVM_X86_DEFAULT_VM 0
#define KVM_X86_SW_PROTECTED_VM 1
+#define KVM_X86_SEV_VM 8
+#define KVM_X86_SEV_ES_VM 10
#endif /* _ASM_X86_KVM_H */
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 06e03a6fe7e4..f859ea270fcc 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -261,6 +261,9 @@ 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;
+
ret = -EBUSY;
if (unlikely(sev->active))
return ret;
@@ -280,6 +283,7 @@ 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);
@@ -1815,7 +1819,8 @@ 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;
}
@@ -2136,6 +2141,7 @@ 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);
@@ -3193,3 +3199,16 @@ void sev_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector)
ghcb_set_sw_exit_info_2(svm->sev_es.ghcb, 1);
}
+
+bool sev_is_vm_type_supported(unsigned long type)
+{
+ if (type == KVM_X86_SEV_VM)
+ return sev_enabled;
+ if (type == KVM_X86_SEV_ES_VM)
+ return sev_es_enabled;
+
+ return false;
+}
+
+static_assert((KVM_X86_SEV_VM & __KVM_X86_VM_TYPE_FEATURES) == 0);
+static_assert((KVM_X86_SEV_ES_VM & __KVM_X86_VM_TYPE_FEATURES) == __KVM_X86_PROTECTED_STATE_TYPE);
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 392b9c2e2ce1..87541c84d07e 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -4087,6 +4087,11 @@ static void svm_cancel_injection(struct kvm_vcpu *vcpu)
static int svm_vcpu_pre_run(struct kvm_vcpu *vcpu)
{
+ struct kvm_sev_info *sev = &to_kvm_svm(vcpu->kvm)->sev_info;
+
+ if (sev->need_init)
+ return -EINVAL;
+
return 1;
}
@@ -4888,6 +4893,11 @@ static void svm_vm_destroy(struct kvm *kvm)
static int svm_vm_init(struct kvm *kvm)
{
+ if (kvm->arch.vm_type) {
+ struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
+ sev->need_init = true;
+ }
+
if (!pause_filter_count || !pause_filter_thresh)
kvm->arch.pause_in_guest = true;
@@ -4914,6 +4924,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
.vcpu_free = svm_vcpu_free,
.vcpu_reset = svm_vcpu_reset,
+ .is_vm_type_supported = sev_is_vm_type_supported,
.vm_size = sizeof(struct kvm_svm),
.vm_init = svm_vm_init,
.vm_destroy = svm_vm_destroy,
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 864c782eaa58..63be26d4a024 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -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 */
@@ -696,6 +697,7 @@ void sev_es_vcpu_reset(struct vcpu_svm *svm);
void sev_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector);
void sev_es_prepare_switch_to_guest(struct vcpu_svm *svm, struct sev_es_save_area *hostsa);
void sev_es_unmap_ghcb(struct vcpu_svm *svm);
+bool sev_is_vm_type_supported(unsigned long type);
/* vmenter.S */
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index d4029053b6d8..4b26d84bc836 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4794,6 +4794,10 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
r = BIT(KVM_X86_DEFAULT_VM);
if (kvm_is_vm_type_supported(KVM_X86_SW_PROTECTED_VM))
r |= BIT(KVM_X86_SW_PROTECTED_VM);
+ if (kvm_is_vm_type_supported(KVM_X86_SEV_VM))
+ r |= BIT(KVM_X86_SEV_VM);
+ if (kvm_is_vm_type_supported(KVM_X86_SEV_ES_VM))
+ r |= BIT(KVM_X86_SEV_ES_VM);
break;
default:
break;
--
2.39.1
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