From: Michael Roth <michael.roth@amd.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: <kvm@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
Sean Christopherson <seanjc@google.com>,
Brijesh Singh <brijesh.singh@amd.com>,
Ashish Kalra <ashish.kalra@amd.com>
Subject: [PULL 03/19] KVM: SEV: Add initial SEV-SNP support
Date: Fri, 10 May 2024 16:10:08 -0500 [thread overview]
Message-ID: <20240510211024.556136-4-michael.roth@amd.com> (raw)
In-Reply-To: <20240510211024.556136-1-michael.roth@amd.com>
From: Brijesh Singh <brijesh.singh@amd.com>
SEV-SNP builds upon existing SEV and SEV-ES functionality while adding
new hardware-based security protection. SEV-SNP adds strong memory
encryption and integrity protection to help prevent malicious
hypervisor-based attacks such as data replay, memory re-mapping, and
more, to create an isolated execution environment.
Define a new KVM_X86_SNP_VM type which makes use of these capabilities
and extend the KVM_SEV_INIT2 ioctl to support it. Also add a basic
helper to check whether SNP is enabled and set PFERR_PRIVATE_ACCESS for
private #NPFs so they are handled appropriately by KVM MMU.
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Co-developed-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20240501085210.2213060-5-michael.roth@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/include/asm/svm.h | 3 ++-
arch/x86/include/uapi/asm/kvm.h | 1 +
arch/x86/kvm/svm/sev.c | 21 ++++++++++++++++++++-
arch/x86/kvm/svm/svm.c | 8 +++++++-
arch/x86/kvm/svm/svm.h | 12 ++++++++++++
5 files changed, 42 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
index 728c98175b9c..544a43c1cf11 100644
--- a/arch/x86/include/asm/svm.h
+++ b/arch/x86/include/asm/svm.h
@@ -285,7 +285,8 @@ static_assert((X2AVIC_MAX_PHYSICAL_ID & AVIC_PHYSICAL_MAX_INDEX_MASK) == X2AVIC_
#define AVIC_HPA_MASK ~((0xFFFULL << 52) | 0xFFF)
-#define SVM_SEV_FEAT_DEBUG_SWAP BIT(5)
+#define SVM_SEV_FEAT_SNP_ACTIVE BIT(0)
+#define SVM_SEV_FEAT_DEBUG_SWAP BIT(5)
struct vmcb_seg {
u16 selector;
diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h
index 9fae1b73b529..d2ae5fcc0275 100644
--- a/arch/x86/include/uapi/asm/kvm.h
+++ b/arch/x86/include/uapi/asm/kvm.h
@@ -874,5 +874,6 @@ struct kvm_hyperv_eventfd {
#define KVM_X86_SW_PROTECTED_VM 1
#define KVM_X86_SEV_VM 2
#define KVM_X86_SEV_ES_VM 3
+#define KVM_X86_SNP_VM 4
#endif /* _ASM_X86_KVM_H */
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 0623cfaa7bb0..b3345d45b989 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -47,6 +47,9 @@ module_param_named(sev, sev_enabled, bool, 0444);
static bool sev_es_enabled = true;
module_param_named(sev_es, sev_es_enabled, bool, 0444);
+/* enable/disable SEV-SNP support */
+static bool sev_snp_enabled;
+
/* enable/disable SEV-ES DebugSwap support */
static bool sev_es_debug_swap_enabled = true;
module_param_named(debug_swap, sev_es_debug_swap_enabled, bool, 0444);
@@ -288,6 +291,9 @@ static int __sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp,
if (sev->es_active && !sev->ghcb_version)
sev->ghcb_version = GHCB_VERSION_DEFAULT;
+ if (vm_type == KVM_X86_SNP_VM)
+ sev->vmsa_features |= SVM_SEV_FEAT_SNP_ACTIVE;
+
ret = sev_asid_new(sev);
if (ret)
goto e_no_asid;
@@ -348,7 +354,8 @@ static int sev_guest_init2(struct kvm *kvm, struct kvm_sev_cmd *argp)
return -EINVAL;
if (kvm->arch.vm_type != KVM_X86_SEV_VM &&
- kvm->arch.vm_type != KVM_X86_SEV_ES_VM)
+ kvm->arch.vm_type != KVM_X86_SEV_ES_VM &&
+ kvm->arch.vm_type != KVM_X86_SNP_VM)
return -EINVAL;
if (copy_from_user(&data, u64_to_user_ptr(argp->data), sizeof(data)))
@@ -2328,11 +2335,16 @@ void __init sev_set_cpu_caps(void)
kvm_cpu_cap_set(X86_FEATURE_SEV_ES);
kvm_caps.supported_vm_types |= BIT(KVM_X86_SEV_ES_VM);
}
+ if (sev_snp_enabled) {
+ kvm_cpu_cap_set(X86_FEATURE_SEV_SNP);
+ kvm_caps.supported_vm_types |= BIT(KVM_X86_SNP_VM);
+ }
}
void __init sev_hardware_setup(void)
{
unsigned int eax, ebx, ecx, edx, sev_asid_count, sev_es_asid_count;
+ bool sev_snp_supported = false;
bool sev_es_supported = false;
bool sev_supported = false;
@@ -2413,6 +2425,7 @@ void __init sev_hardware_setup(void)
sev_es_asid_count = min_sev_asid - 1;
WARN_ON_ONCE(misc_cg_set_capacity(MISC_CG_RES_SEV_ES, sev_es_asid_count));
sev_es_supported = true;
+ sev_snp_supported = sev_snp_enabled && cc_platform_has(CC_ATTR_HOST_SEV_SNP);
out:
if (boot_cpu_has(X86_FEATURE_SEV))
@@ -2425,9 +2438,15 @@ void __init sev_hardware_setup(void)
pr_info("SEV-ES %s (ASIDs %u - %u)\n",
sev_es_supported ? "enabled" : "disabled",
min_sev_asid > 1 ? 1 : 0, min_sev_asid - 1);
+ if (boot_cpu_has(X86_FEATURE_SEV_SNP))
+ pr_info("SEV-SNP %s (ASIDs %u - %u)\n",
+ sev_snp_supported ? "enabled" : "disabled",
+ min_sev_asid > 1 ? 1 : 0, min_sev_asid - 1);
sev_enabled = sev_supported;
sev_es_enabled = sev_es_supported;
+ sev_snp_enabled = sev_snp_supported;
+
if (!sev_es_enabled || !cpu_feature_enabled(X86_FEATURE_DEBUG_SWAP) ||
!cpu_feature_enabled(X86_FEATURE_NO_NESTED_DATA_BP))
sev_es_debug_swap_enabled = false;
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index c8dc25886c16..66d5e2e46a66 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2057,6 +2057,9 @@ static int npf_interception(struct kvm_vcpu *vcpu)
if (WARN_ON_ONCE(error_code & PFERR_SYNTHETIC_MASK))
error_code &= ~PFERR_SYNTHETIC_MASK;
+ if (sev_snp_guest(vcpu->kvm) && (error_code & PFERR_GUEST_ENC_MASK))
+ error_code |= PFERR_PRIVATE_ACCESS;
+
trace_kvm_page_fault(vcpu, fault_address, error_code);
return kvm_mmu_page_fault(vcpu, fault_address, error_code,
static_cpu_has(X86_FEATURE_DECODEASSISTS) ?
@@ -4902,8 +4905,11 @@ static int svm_vm_init(struct kvm *kvm)
if (type != KVM_X86_DEFAULT_VM &&
type != KVM_X86_SW_PROTECTED_VM) {
- kvm->arch.has_protected_state = (type == KVM_X86_SEV_ES_VM);
+ kvm->arch.has_protected_state =
+ (type == KVM_X86_SEV_ES_VM || type == KVM_X86_SNP_VM);
to_kvm_sev_info(kvm)->need_init = true;
+
+ kvm->arch.has_private_mem = (type == KVM_X86_SNP_VM);
}
if (!pause_filter_count || !pause_filter_thresh)
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index be57213cd295..583e035d38f8 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -349,6 +349,18 @@ static __always_inline bool sev_es_guest(struct kvm *kvm)
#endif
}
+static __always_inline bool sev_snp_guest(struct kvm *kvm)
+{
+#ifdef CONFIG_KVM_AMD_SEV
+ struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
+
+ return (sev->vmsa_features & SVM_SEV_FEAT_SNP_ACTIVE) &&
+ !WARN_ON_ONCE(!sev_es_guest(kvm));
+#else
+ return false;
+#endif
+}
+
static inline void vmcb_mark_all_dirty(struct vmcb *vmcb)
{
vmcb->control.clean = 0;
--
2.25.1
next prev parent reply other threads:[~2024-05-10 21:21 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-10 21:10 [PULL 00/19] KVM: Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support Michael Roth
2024-05-10 21:10 ` [PULL 01/19] KVM: MMU: Disable fast path if KVM_EXIT_MEMORY_FAULT is needed Michael Roth
2024-05-10 21:10 ` [PULL 02/19] KVM: SEV: Select KVM_GENERIC_PRIVATE_MEM when CONFIG_KVM_AMD_SEV=y Michael Roth
2024-05-10 21:10 ` Michael Roth [this message]
2024-05-10 21:10 ` [PULL 04/19] KVM: SEV: Add KVM_SEV_SNP_LAUNCH_START command Michael Roth
2024-05-10 21:10 ` [PULL 05/19] KVM: SEV: Add KVM_SEV_SNP_LAUNCH_UPDATE command Michael Roth
2024-05-10 21:10 ` [PULL 06/19] KVM: SEV: Add KVM_SEV_SNP_LAUNCH_FINISH command Michael Roth
2024-05-10 21:10 ` [PULL 07/19] KVM: SEV: Add support to handle GHCB GPA register VMGEXIT Michael Roth
2024-05-10 21:10 ` [PULL 08/19] KVM: SEV: Add support to handle MSR based Page State Change VMGEXIT Michael Roth
2024-05-10 21:10 ` [PULL 09/19] KVM: SEV: Add support to handle " Michael Roth
2024-05-12 2:06 ` Michael Roth
2024-05-10 21:10 ` [PULL 10/19] KVM: SEV: Add support to handle RMP nested page faults Michael Roth
2024-05-10 21:10 ` [PULL 11/19] KVM: SEV: Support SEV-SNP AP Creation NAE event Michael Roth
2024-05-10 21:10 ` [PULL 12/19] KVM: SEV: Implement gmem hook for initializing private pages Michael Roth
2024-05-10 21:10 ` [PULL 13/19] KVM: SEV: Implement gmem hook for invalidating " Michael Roth
2024-05-15 22:32 ` Sean Christopherson
2024-05-16 3:11 ` Michael Roth
2024-05-21 16:55 ` Paolo Bonzini
2024-05-16 12:45 ` Paolo Bonzini
2024-05-10 21:10 ` [PULL 14/19] KVM: x86: Implement hook for determining max NPT mapping level Michael Roth
2024-05-10 21:10 ` [PULL 15/19] KVM: SEV: Avoid WBINVD for HVA-based MMU notifications for SNP Michael Roth
2024-05-10 21:10 ` [PULL 16/19] KVM: SVM: Add module parameter to enable SEV-SNP Michael Roth
2024-05-10 21:10 ` [PULL 17/19] KVM: SEV: Provide support for SNP_GUEST_REQUEST NAE event Michael Roth
2024-05-17 20:41 ` Edgecombe, Rick P
2024-05-17 22:01 ` Paolo Bonzini
2024-05-18 15:04 ` [PATCH] KVM: SEV: Fix guest memory leak when handling guest requests Michael Roth
2024-05-20 14:17 ` Sean Christopherson
2024-05-20 22:50 ` Michael Roth
2024-05-20 23:32 ` Sean Christopherson
2024-05-21 2:00 ` Michael Roth
2024-05-21 14:09 ` Sean Christopherson
2024-05-21 15:34 ` Michael Roth
2024-05-21 16:58 ` Sean Christopherson
2024-05-21 21:00 ` Michael Roth
2024-05-20 23:02 ` [PATCH v2] " Michael Roth
2024-05-10 21:10 ` [PULL 18/19] KVM: SEV: Provide support for SNP_EXTENDED_GUEST_REQUEST NAE event Michael Roth
2024-05-13 15:19 ` Nathan Chancellor
2024-05-13 16:53 ` Paolo Bonzini
2024-05-13 17:05 ` Michael Roth
2024-05-13 17:20 ` Paolo Bonzini
2024-05-13 21:18 ` Michael Roth
2024-05-10 21:10 ` [PULL 19/19] crypto: ccp: Add the SNP_VLEK_LOAD command Michael Roth
2024-05-12 7:14 ` [PULL 00/19] KVM: Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support Paolo Bonzini
2024-05-12 8:17 ` Paolo Bonzini
2024-05-13 1:06 ` Michael Roth
2024-05-13 22:08 ` Sean Christopherson
2024-05-31 3:22 ` Michael Roth
2024-06-03 16:44 ` Paolo Bonzini
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