From patchwork Mon Sep 13 14:13:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joerg Roedel X-Patchwork-Id: 12489541 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 31141C433EF for ; Mon, 13 Sep 2021 14:16:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1B75960F9F for ; Mon, 13 Sep 2021 14:16:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345360AbhIMORT (ORCPT ); Mon, 13 Sep 2021 10:17:19 -0400 Received: from 8bytes.org ([81.169.241.247]:56654 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343938AbhIMOPP (ORCPT ); Mon, 13 Sep 2021 10:15:15 -0400 Received: from cap.home.8bytes.org (p549ad441.dip0.t-ipconnect.de [84.154.212.65]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by theia.8bytes.org (Postfix) with ESMTPSA id 0627F2A5; Mon, 13 Sep 2021 16:13:57 +0200 (CEST) From: Joerg Roedel To: Paolo Bonzini Cc: Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , x86@kernel.org, Brijesh Singh , Tom Lendacky , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Joerg Roedel Subject: [PATCH v3 3/4] KVM: SVM: Add support for Hypervisor Feature support MSR protocol Date: Mon, 13 Sep 2021 16:13:44 +0200 Message-Id: <20210913141345.27175-4-joro@8bytes.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210913141345.27175-1-joro@8bytes.org> References: <20210913141345.27175-1-joro@8bytes.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.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 | 19 +++++++++++++++++++ arch/x86/kvm/svm/svm.h | 1 + 3 files changed, 21 insertions(+) diff --git a/arch/x86/include/uapi/asm/svm.h b/arch/x86/include/uapi/asm/svm.h index efa969325ede..67cf153fe580 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_HYPERVISOR_FEATURES 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 8cd1e4ebb4a8..b3fdfccf0499 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -2184,6 +2184,7 @@ 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_HYPERVISOR_FEATURES: break; default: goto vmgexit_err; @@ -2365,6 +2366,16 @@ static u64 ghcb_msr_ap_rst_resp(u64 value) return (u64)GHCB_MSR_AP_RESET_HOLD_RESP | (value << GHCB_DATA_LOW); } +static u64 ghcb_msr_hv_feat_resp(u64 value) +{ + u64 msr; + + msr = GHCB_MSR_HV_FT_RESP; + msr |= (value << GHCB_DATA_LOW); + + return msr; +} + static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm) { struct vmcb_control_area *control = &svm->vmcb->control; @@ -2422,6 +2433,9 @@ static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm) */ svm->vmcb->control.ghcb_gpa = ghcb_msr_ap_rst_resp(0); + break; + case GHCB_MSR_HV_FT_REQ: + svm->vmcb->control.ghcb_gpa = ghcb_msr_hv_feat_resp(GHCB_HV_FT_SUPPORTED); break; case GHCB_MSR_TERM_REQ: { u64 reason_set, reason_code; @@ -2535,6 +2549,11 @@ int sev_handle_vmgexit(struct kvm_vcpu *vcpu) ret = 1; break; } + case SVM_VMGEXIT_HYPERVISOR_FEATURES: + 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 524d943f3efc..f019da28ff06 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -542,6 +542,7 @@ 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;