From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from theia.8bytes.org (8bytes.org [81.169.241.247]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9CEDA70 for ; Thu, 22 Jul 2021 12:02:07 +0000 (UTC) Received: by theia.8bytes.org (Postfix, from userid 1000) id 1043E3D0; Thu, 22 Jul 2021 14:02:04 +0200 (CEST) Date: Thu, 22 Jul 2021 14:01:56 +0200 From: Joerg Roedel To: Paolo Bonzini Cc: Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Brijesh Singh , Tom Lendacky , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev, Joerg Roedel Subject: [PATCH v2.1 3/4] KVM: SVM: Add support for Hypervisor Feature support MSR protocol Message-ID: References: <20210722115245.16084-1-joro@8bytes.org> <20210722115245.16084-4-joro@8bytes.org> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210722115245.16084-4-joro@8bytes.org> From: Brijesh Singh Version 2 of the GHCB specification introduced advertisement of supported Hypervisor SEV features. This request is required to support a the GHCB version 2 protocol. Signed-off-by: Brijesh Singh Signed-off-by: Joerg Roedel --- arch/x86/include/uapi/asm/svm.h | 1 + arch/x86/kvm/svm/sev.c | 21 +++++++++++++++++++++ arch/x86/kvm/svm/svm.h | 1 + 3 files changed, 23 insertions(+) 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 a32ef011025f..4565c360d87d 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -2180,6 +2180,7 @@ 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; @@ -2361,6 +2362,16 @@ static void set_ghcb_msr_ap_rst_resp(struct vcpu_svm *svm, u64 value) svm->vmcb->control.ghcb_gpa = GHCB_MSR_AP_RESET_HOLD_RESP | (value << GHCB_DATA_LOW); } +static void set_ghcb_msr_hv_feat_resp(struct vcpu_svm *svm, u64 value) +{ + u64 msr; + + msr = GHCB_MSR_HV_FT_RESP; + msr |= (value << GHCB_DATA_LOW); + + svm->vmcb->control.ghcb_gpa = msr; +} + static void set_ghcb_msr(struct vcpu_svm *svm, u64 value) { svm->vmcb->control.ghcb_gpa = value; @@ -2425,6 +2436,10 @@ static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm) break; } + case GHCB_MSR_HV_FT_REQ: { + set_ghcb_msr_hv_feat_resp(svm, GHCB_HV_FT_SUPPORTED); + break; + } case GHCB_MSR_TERM_REQ: { u64 reason_set, reason_code; @@ -2537,6 +2552,12 @@ 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 7e2090752d8f..9cafeba3340e 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -550,6 +550,7 @@ 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