From: Joerg Roedel <joro@8bytes.org>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Brijesh Singh <brijesh.singh@amd.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
x86@kernel.org, Joerg Roedel <jroedel@suse.de>
Subject: [PATCH 2/3] KVM: SVM: Add support for Hypervisor Feature support MSR protocol
Date: Tue, 13 Jul 2021 11:35:45 +0200 [thread overview]
Message-ID: <20210713093546.7467-3-joro@8bytes.org> (raw)
In-Reply-To: <20210713093546.7467-1-joro@8bytes.org>
From: Brijesh Singh <brijesh.singh@amd.com>
Version 2 of the GHCB specification introduced advertisement of features
that are supported by the Hypervisor.
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
arch/x86/include/asm/sev-common.h | 4 ++++
arch/x86/include/uapi/asm/svm.h | 1 +
arch/x86/kvm/svm/sev.c | 12 ++++++++++++
arch/x86/kvm/svm/svm.h | 1 +
4 files changed, 18 insertions(+)
diff --git a/arch/x86/include/asm/sev-common.h b/arch/x86/include/asm/sev-common.h
index dda34ecac5c0..0374f5687fc0 100644
--- a/arch/x86/include/asm/sev-common.h
+++ b/arch/x86/include/asm/sev-common.h
@@ -60,6 +60,10 @@
#define GHCB_MSR_HV_FT_REQ 0x080
#define GHCB_MSR_HV_FT_RESP 0x081
+/* GHCB Hypervisor Feature Request/Response */
+#define GHCB_MSR_HV_FT_REQ 0x080
+#define GHCB_MSR_HV_FT_RESP 0x081
+
#define GHCB_MSR_TERM_REQ 0x100
#define GHCB_MSR_TERM_REASON_SET_POS 12
#define GHCB_MSR_TERM_REASON_SET_MASK 0xf
diff --git a/arch/x86/include/uapi/asm/svm.h b/arch/x86/include/uapi/asm/svm.h
index efa969325ede..fbb6f8d27a80 100644
--- a/arch/x86/include/uapi/asm/svm.h
+++ b/arch/x86/include/uapi/asm/svm.h
@@ -108,6 +108,7 @@
#define SVM_VMGEXIT_AP_JUMP_TABLE 0x80000005
#define SVM_VMGEXIT_SET_AP_JUMP_TABLE 0
#define SVM_VMGEXIT_GET_AP_JUMP_TABLE 1
+#define SVM_VMGEXIT_HV_FT 0x8000fffd
#define SVM_VMGEXIT_UNSUPPORTED_EVENT 0x8000ffff
/* Exit code reserved for hypervisor/software use */
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 0ec88b349799..8121b335651c 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -2182,6 +2182,7 @@ static int sev_es_validate_vmgexit(struct vcpu_svm *svm)
case SVM_VMGEXIT_AP_HLT_LOOP:
case SVM_VMGEXIT_AP_JUMP_TABLE:
case SVM_VMGEXIT_UNSUPPORTED_EVENT:
+ case SVM_VMGEXIT_HV_FT:
break;
default:
goto vmgexit_err;
@@ -2434,6 +2435,11 @@ static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm)
GHCB_MSR_INFO_MASK, GHCB_MSR_INFO_POS);
break;
}
+ case GHCB_MSR_HV_FT_REQ: {
+ set_ghcb_msr_bits(svm, GHCB_HV_FT_SUPPORTED, GHCB_DATA_MASK, GHCB_DATA_LOW);
+ set_ghcb_msr_bits(svm, GHCB_MSR_HV_FT_RESP, GHCB_MSR_INFO_MASK, GHCB_MSR_INFO_POS);
+ break;
+ }
case GHCB_MSR_TERM_REQ: {
u64 reason_set, reason_code;
@@ -2549,6 +2555,12 @@ int sev_handle_vmgexit(struct kvm_vcpu *vcpu)
ret = 1;
break;
}
+ case SVM_VMGEXIT_HV_FT: {
+ ghcb_set_sw_exit_info_2(ghcb, GHCB_HV_FT_SUPPORTED);
+
+ ret = 1;
+ break;
+ }
case SVM_VMGEXIT_UNSUPPORTED_EVENT:
vcpu_unimpl(vcpu,
"vmgexit: unsupported event - exit_info_1=%#llx, exit_info_2=%#llx\n",
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index b21b9df54121..77379e1442cc 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -546,6 +546,7 @@ void svm_vcpu_unblocking(struct kvm_vcpu *vcpu);
#define GHCB_VERSION_MAX 1ULL
#define GHCB_VERSION_MIN 1ULL
+#define GHCB_HV_FT_SUPPORTED 0
extern unsigned int max_sev_asid;
--
2.31.1
next prev parent reply other threads:[~2021-07-13 9:35 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-13 9:35 [PATCH 0/3] kvm: svm: Add initial GHCB protocol version 2 support Joerg Roedel
2021-07-13 9:35 ` [PATCH 1/3] KVM: SVM: Add support to handle AP reset MSR protocol Joerg Roedel
2021-07-13 9:35 ` Joerg Roedel [this message]
2021-07-13 13:35 ` [PATCH 2/3] KVM: SVM: Add support for Hypervisor Feature support " Tom Lendacky
2021-07-13 14:59 ` Joerg Roedel
2021-07-13 9:35 ` [PATCH 3/3] KVM: SVM: Increase supported GHCB protocol version Joerg Roedel
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