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From: Brijesh Singh <brijesh.singh@amd.com>
To: x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: tglx@linutronix.de, bp@alien8.de, jroedel@suse.de,
	thomas.lendacky@amd.com, pbonzini@redhat.com, mingo@redhat.com,
	dave.hansen@intel.com, rientjes@google.com, seanjc@google.com,
	peterz@infradead.org, hpa@zytor.com, tony.luck@intel.com,
	Brijesh Singh <brijesh.singh@amd.com>
Subject: [PATCH Part2 RFC v2 31/37] KVM: SVM: Add support to handle GHCB GPA register VMGEXIT
Date: Fri, 30 Apr 2021 07:38:16 -0500	[thread overview]
Message-ID: <20210430123822.13825-32-brijesh.singh@amd.com> (raw)
In-Reply-To: <20210430123822.13825-1-brijesh.singh@amd.com>

SEV-SNP guests are required to perform a GHCB GPA registration (see
section 2.5.2 in GHCB specification). Before using a GHCB GPA for a vCPU
the first time, a guest must register the vCPU GHCB GPA. If hypervisor
can work with the guest requested GPA then it must respond back with the
same GPA otherwise return -1.

On VMEXIT, Verify that GHCB GPA matches with the registered value. If a
mismatch is detected then abort the guest.

Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
 arch/x86/kvm/svm/sev.c | 25 +++++++++++++++++++++++++
 arch/x86/kvm/svm/svm.h |  7 +++++++
 2 files changed, 32 insertions(+)

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 3203abbd22f3..1cba9d770860 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -2904,6 +2904,25 @@ static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm)
 				GHCB_MSR_INFO_MASK, GHCB_MSR_INFO_POS);
 		break;
 	}
+	case GHCB_MSR_GPA_REG_REQ: {
+		kvm_pfn_t pfn;
+		u64 gfn;
+
+		gfn = get_ghcb_msr_bits(svm, GHCB_MSR_GPA_REG_VALUE_MASK,
+					GHCB_MSR_GPA_REG_VALUE_POS);
+
+		pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn);
+		if (is_error_noslot_pfn(pfn))
+			gfn = GHCB_MSR_GPA_REG_ERROR;
+		else
+			svm->ghcb_registered_gpa = gfn_to_gpa(gfn);
+
+		set_ghcb_msr_bits(svm, gfn, GHCB_MSR_GPA_REG_VALUE_MASK,
+				  GHCB_MSR_GPA_REG_VALUE_POS);
+		set_ghcb_msr_bits(svm, GHCB_MSR_GPA_REG_RESP, GHCB_MSR_INFO_MASK,
+				  GHCB_MSR_INFO_POS);
+		break;
+	}
 	case GHCB_MSR_TERM_REQ: {
 		u64 reason_set, reason_code;
 
@@ -2952,6 +2971,12 @@ int sev_handle_vmgexit(struct kvm_vcpu *vcpu)
 		return -EINVAL;
 	}
 
+	/* SEV-SNP guest requires that the GHCB GPA must be registered */
+	if (sev_snp_guest(svm->vcpu.kvm) && !ghcb_gpa_is_registered(svm, ghcb_gpa)) {
+		vcpu_unimpl(&svm->vcpu, "vmgexit: GHCB GPA [%#llx] is not registered.\n", ghcb_gpa);
+		return -EINVAL;
+	}
+
 	svm->ghcb = svm->ghcb_map.hva;
 	ghcb = svm->ghcb_map.hva;
 
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index cf9f0e6c6827..243503fa3fd6 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -185,6 +185,8 @@ struct vcpu_svm {
 	bool ghcb_sa_free;
 
 	bool guest_state_loaded;
+
+	u64 ghcb_registered_gpa;
 };
 
 struct svm_cpu_data {
@@ -245,6 +247,11 @@ static inline bool sev_snp_guest(struct kvm *kvm)
 #endif
 }
 
+static inline bool ghcb_gpa_is_registered(struct vcpu_svm *svm, u64 val)
+{
+	return svm->ghcb_registered_gpa == val;
+}
+
 static inline void vmcb_mark_all_dirty(struct vmcb *vmcb)
 {
 	vmcb->control.clean = 0;
-- 
2.17.1


  parent reply	other threads:[~2021-04-30 12:42 UTC|newest]

Thread overview: 67+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-30 12:37 [PATCH Part2 RFC v2 00/37] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support Brijesh Singh
2021-04-30 12:37 ` [PATCH Part2 RFC v2 01/37] KVM: SVM: Add support to handle AP reset MSR protocol Brijesh Singh
2021-04-30 12:37 ` [PATCH Part2 RFC v2 02/37] KVM: SVM: Provide the Hypervisor Feature support VMGEXIT Brijesh Singh
2021-04-30 12:37 ` [PATCH Part2 RFC v2 03/37] KVM: SVM: Increase the GHCB protocol version Brijesh Singh
2021-04-30 12:37 ` [PATCH Part2 RFC v2 04/37] x86/cpufeatures: Add SEV-SNP CPU feature Brijesh Singh
2021-04-30 12:37 ` [PATCH Part2 RFC v2 05/37] x86/sev: Add the host SEV-SNP initialization support Brijesh Singh
2021-04-30 12:37 ` [PATCH Part2 RFC v2 06/37] x86/sev: Add RMP entry lookup helpers Brijesh Singh
2021-04-30 12:37 ` [PATCH Part2 RFC v2 07/37] x86/sev: Add helper functions for RMPUPDATE and PSMASH instruction Brijesh Singh
2021-04-30 12:37 ` [PATCH Part2 RFC v2 08/37] x86/sev: Split the physmap when adding the page in RMP table Brijesh Singh
2021-05-03 15:07   ` Peter Zijlstra
2021-05-03 15:15   ` Andy Lutomirski
2021-05-03 15:41     ` Dave Hansen
2021-05-07 11:28       ` Vlastimil Babka
2021-04-30 12:37 ` [PATCH Part2 RFC v2 09/37] x86/traps: Define RMP violation #PF error code Brijesh Singh
2021-04-30 12:37 ` [PATCH Part2 RFC v2 10/37] x86/fault: Add support to handle the RMP fault for kernel address Brijesh Singh
2021-05-03 14:44   ` Dave Hansen
2021-05-03 15:03     ` Andy Lutomirski
2021-05-03 15:49       ` Brijesh Singh
2021-05-03 15:37     ` Brijesh Singh
2021-05-03 16:15       ` Dave Hansen
2021-05-03 17:19         ` Brijesh Singh
2021-05-03 17:31           ` Brijesh Singh
2021-05-03 17:40           ` Andy Lutomirski
2021-05-03 19:41             ` Brijesh Singh
2021-05-03 19:43               ` Dave Hansen
2021-05-04 12:31                 ` Brijesh Singh
2021-05-04 14:33                   ` Dave Hansen
2021-05-04 15:16                     ` Brijesh Singh
2021-04-30 12:37 ` [PATCH Part2 RFC v2 11/37] x86/fault: Add support to handle the RMP fault for user address Brijesh Singh
2021-04-30 12:37 ` [PATCH Part2 RFC v2 12/37] crypto:ccp: Define the SEV-SNP commands Brijesh Singh
2021-04-30 12:37 ` [PATCH Part2 RFC v2 13/37] crypto: ccp: Add support to initialize the AMD-SP for SEV-SNP Brijesh Singh
2021-04-30 12:37 ` [PATCH Part2 RFC v2 14/37] crypto: ccp: Shutdown SNP firmware on kexec Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 15/37] crypto:ccp: Provide APIs to issue SEV-SNP commands Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 16/37] crypto: ccp: Handle the legacy TMR allocation when SNP is enabled Brijesh Singh
2021-05-10 18:23   ` Peter Gonda
2021-05-10 20:07     ` Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 17/37] crypto: ccp: Handle the legacy SEV command " Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 18/37] KVM: SVM: make AVIC backing, VMSA and VMCB memory allocation SNP safe Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 19/37] KVM: SVM: Add initial SEV-SNP support Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 20/37] KVM: SVM: define new SEV_FEATURES field in the VMCB Save State Area Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 21/37] KVM: SVM: Add KVM_SNP_INIT command Brijesh Singh
2021-05-06 20:25   ` Peter Gonda
2021-05-06 22:29     ` Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 22/37] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_START command Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 23/37] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_UPDATE command Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 24/37] KVM: SVM: Reclaim the guest pages when SEV-SNP VM terminates Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 25/37] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_FINISH command Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 26/37] KVM: X86: Add kvm_x86_ops to get the max page level for the TDP Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 27/37] KVM: X86: Introduce kvm_mmu_map_tdp_page() for use by SEV Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 28/37] KVM: X86: Introduce kvm_mmu_get_tdp_walk() for SEV-SNP use Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 29/37] KVM: X86: Define new RMP check related #NPF error bits Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 30/37] KVM: X86: update page-fault trace to log the 64-bit error code Brijesh Singh
2021-04-30 12:38 ` Brijesh Singh [this message]
2021-04-30 12:38 ` [PATCH Part2 RFC v2 32/37] KVM: SVM: Add support to handle MSR based Page State Change VMGEXIT Brijesh Singh
2021-05-10 17:30   ` Peter Gonda
2021-05-10 17:51     ` Brijesh Singh
2021-05-10 19:59       ` Peter Gonda
2021-05-10 20:50         ` Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 33/37] KVM: SVM: Add support to handle " Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 34/37] KVM: X86: Export the kvm_zap_gfn_range() for the SNP use Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 35/37] KVM: SVM: Add support to handle the RMP nested page fault Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 36/37] KVM: SVM: Provide support for SNP_GUEST_REQUEST NAE event Brijesh Singh
2021-05-10 18:57   ` Peter Gonda
2021-05-10 20:14     ` Brijesh Singh
2021-05-10 21:17       ` Sean Christopherson
2021-05-11 18:34         ` Brijesh Singh
2021-04-30 12:38 ` [PATCH Part2 RFC v2 37/37] KVM: SVM: Advertise the SEV-SNP feature support Brijesh Singh

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