From patchwork Fri Jul 5 21:06:33 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liran Alon X-Patchwork-Id: 11033363 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D7FC1138B for ; Fri, 5 Jul 2019 21:20:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 45ACC202A5 for ; Fri, 5 Jul 2019 21:20:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 378092624B; Fri, 5 Jul 2019 21:20:31 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.0 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id E45ED2857B for ; 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Fri, 05 Jul 2019 21:07:00 +0000 Received: from abhmp0003.oracle.com (abhmp0003.oracle.com [141.146.116.9]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x65L6wQa013862; Fri, 5 Jul 2019 21:06:58 GMT Received: from spark.ravello.local (/213.57.127.2) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 05 Jul 2019 14:06:58 -0700 From: Liran Alon To: qemu-devel@nongnu.org Date: Sat, 6 Jul 2019 00:06:33 +0300 Message-Id: <20190705210636.3095-2-liran.alon@oracle.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190705210636.3095-1-liran.alon@oracle.com> References: <20190705210636.3095-1-liran.alon@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9309 signatures=668688 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=832 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907050266 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9309 signatures=668688 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=887 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907050266 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 156.151.31.86 Subject: [Qemu-devel] [PATCH 1/4] target/i386: kvm: Init nested-state for VMX when vCPU expose VMX X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: pbonzini@redhat.com, Joao Martins , Liran Alon , ehabkost@redhat.com, kvm@vger.kernel.org Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Reviewed-by: Joao Martins Signed-off-by: Liran Alon Reviewed-by: Maran Wilson --- target/i386/kvm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/target/i386/kvm.c b/target/i386/kvm.c index e4b4f5756a34..b57f873ec9e8 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -1714,7 +1714,7 @@ int kvm_arch_init_vcpu(CPUState *cs) env->nested_state->size = max_nested_state_len; - if (IS_INTEL_CPU(env)) { + if (cpu_has_vmx(env)) { struct kvm_vmx_nested_state_hdr *vmx_hdr = &env->nested_state->hdr.vmx; From patchwork Fri Jul 5 21:06:34 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liran Alon X-Patchwork-Id: 11033361 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 64007112C for ; Fri, 5 Jul 2019 21:17:47 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4B36328ABB for ; Fri, 5 Jul 2019 21:17:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3CE7828ABF; Fri, 5 Jul 2019 21:17:47 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.0 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id DCED228ABB for ; 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Fri, 05 Jul 2019 21:07:01 +0000 Received: from abhmp0003.oracle.com (abhmp0003.oracle.com [141.146.116.9]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x65L70ax030850; Fri, 5 Jul 2019 21:07:00 GMT Received: from spark.ravello.local (/213.57.127.2) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 05 Jul 2019 14:07:00 -0700 From: Liran Alon To: qemu-devel@nongnu.org Date: Sat, 6 Jul 2019 00:06:34 +0300 Message-Id: <20190705210636.3095-3-liran.alon@oracle.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190705210636.3095-1-liran.alon@oracle.com> References: <20190705210636.3095-1-liran.alon@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9309 signatures=668688 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=827 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907050266 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9309 signatures=668688 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=871 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907050266 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 141.146.126.78 Subject: [Qemu-devel] [PATCH 2/4] target/i386: kvm: Init nested-state for vCPU exposed with SVM X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: pbonzini@redhat.com, Joao Martins , Liran Alon , ehabkost@redhat.com, kvm@vger.kernel.org Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Reviewed-by: Joao Martins Signed-off-by: Liran Alon Reviewed-by: Maran Wilson --- target/i386/cpu.h | 5 +++++ target/i386/kvm.c | 2 ++ 2 files changed, 7 insertions(+) diff --git a/target/i386/cpu.h b/target/i386/cpu.h index 93345792f4cb..cdb0e43676a9 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -1867,6 +1867,11 @@ static inline bool cpu_has_vmx(CPUX86State *env) return env->features[FEAT_1_ECX] & CPUID_EXT_VMX; } +static inline bool cpu_has_svm(CPUX86State *env) +{ + return env->features[FEAT_8000_0001_ECX] & CPUID_EXT3_SVM; +} + /* fpu_helper.c */ void update_fp_status(CPUX86State *env); void update_mxcsr_status(CPUX86State *env); diff --git a/target/i386/kvm.c b/target/i386/kvm.c index b57f873ec9e8..4e2c8652168f 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -1721,6 +1721,8 @@ int kvm_arch_init_vcpu(CPUState *cs) env->nested_state->format = KVM_STATE_NESTED_FORMAT_VMX; vmx_hdr->vmxon_pa = -1ull; vmx_hdr->vmcs12_pa = -1ull; + } else if (cpu_has_svm(env)) { + env->nested_state->format = KVM_STATE_NESTED_FORMAT_SVM; } } From patchwork Fri Jul 5 21:06:35 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liran Alon X-Patchwork-Id: 11033371 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 95906112C for ; 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Fri, 5 Jul 2019 21:07:02 GMT Received: from spark.ravello.local (/213.57.127.2) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 05 Jul 2019 14:07:02 -0700 From: Liran Alon To: qemu-devel@nongnu.org Date: Sat, 6 Jul 2019 00:06:35 +0300 Message-Id: <20190705210636.3095-4-liran.alon@oracle.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190705210636.3095-1-liran.alon@oracle.com> References: <20190705210636.3095-1-liran.alon@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9309 signatures=668688 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=661 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907050266 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9309 signatures=668688 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=705 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907050266 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 156.151.31.86 Subject: [Qemu-devel] [PATCH 3/4] target/i386: kvm: Save nested-state only in case vCPU have set VMXON region X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: pbonzini@redhat.com, Joao Martins , Liran Alon , ehabkost@redhat.com, kvm@vger.kernel.org Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Having (nested_state->hdr.vmx.vmxon_pa != -1ull) signals that vCPU have set at some point in time a VMXON region. Note that even though when vCPU enters SMM mode it temporarily exit VMX operation, KVM still reports (vmxon_pa != -1ull). Therefore, this field can be used as a reliable indicator on when we require to send VMX nested-state as part of migration stream. Reviewed-by: Joao Martins Signed-off-by: Liran Alon Reviewed-by: Maran Wilson --- target/i386/machine.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/target/i386/machine.c b/target/i386/machine.c index 851b249d1a39..20bda9f80154 100644 --- a/target/i386/machine.c +++ b/target/i386/machine.c @@ -997,9 +997,8 @@ static bool vmx_nested_state_needed(void *opaque) { struct kvm_nested_state *nested_state = opaque; - return ((nested_state->format == KVM_STATE_NESTED_FORMAT_VMX) && - ((nested_state->hdr.vmx.vmxon_pa != -1ull) || - (nested_state->hdr.vmx.smm.flags & KVM_STATE_NESTED_SMM_VMXON))); + return (nested_state->format == KVM_STATE_NESTED_FORMAT_VMX) && + (nested_state->hdr.vmx.vmxon_pa != -1ull); } static const VMStateDescription vmstate_vmx_nested_state = { From patchwork Fri Jul 5 21:06:36 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liran Alon X-Patchwork-Id: 11033359 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2FD34112C for ; 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Fri, 5 Jul 2019 21:07:04 GMT Received: from spark.ravello.local (/213.57.127.2) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 05 Jul 2019 14:07:04 -0700 From: Liran Alon To: qemu-devel@nongnu.org Date: Sat, 6 Jul 2019 00:06:36 +0300 Message-Id: <20190705210636.3095-5-liran.alon@oracle.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190705210636.3095-1-liran.alon@oracle.com> References: <20190705210636.3095-1-liran.alon@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9309 signatures=668688 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=3 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907050266 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9309 signatures=668688 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=3 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907050266 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 156.151.31.86 Subject: [Qemu-devel] [PATCH 4/4] target/i386: kvm: Demand nested migration kernel capabilities only when vCPU may have enabled VMX X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: pbonzini@redhat.com, Joao Martins , Liran Alon , ehabkost@redhat.com, kvm@vger.kernel.org Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Previous to this change, a vCPU exposed with VMX running on a kernel without KVM_CAP_NESTED_STATE or KVM_CAP_EXCEPTION_PAYLOAD resulted in adding a migration blocker. This was because when code was written it was thought there is no way to reliabely know if a vCPU is utilising VMX or not at runtime. However, it turns out that this can be known to some extent: In order for a vCPU to enter VMX operation it must have CR4.VMXE set. Since it was set, CR4.VMXE must remain set as long as vCPU is in VMX operation. This is because CR4.VMXE is one of the bits set in MSR_IA32_VMX_CR4_FIXED1. There is one exception to above statement when vCPU enters SMM mode. When a vCPU enters SMM mode, it temporarily exit VMX operation and may also reset CR4.VMXE during execution in SMM mode. When vCPU exits SMM mode, vCPU state is restored to be in VMX operation and CR4.VMXE is restored to it's original value of being set. Therefore, when vCPU is not in SMM mode, we can infer whether VMX is being used by examining CR4.VMXE. Otherwise, we cannot know for certain but assume the worse that vCPU may utilise VMX. Summaring all the above, a vCPU may have enabled VMX in case CR4.VMXE is set or vCPU is in SMM mode. Therefore, remove migration blocker and check before migration (cpu_pre_save()) if vCPU may have enabled VMX. If true, only then require relevant kernel capabilities. While at it, demand KVM_CAP_EXCEPTION_PAYLOAD only when vCPU is in guest-mode and there is a pending/injected exception. Otherwise, this kernel capability is not required for proper migration. Reviewed-by: Joao Martins Signed-off-by: Liran Alon Reviewed-by: Maran Wilson Tested-by: Maran Wilson --- target/i386/cpu.h | 22 ++++++++++++++++++++++ target/i386/kvm.c | 26 ++++++-------------------- target/i386/kvm_i386.h | 1 + target/i386/machine.c | 24 ++++++++++++++++++++---- 4 files changed, 49 insertions(+), 24 deletions(-) diff --git a/target/i386/cpu.h b/target/i386/cpu.h index cdb0e43676a9..c752c4d936ee 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -1872,6 +1872,28 @@ static inline bool cpu_has_svm(CPUX86State *env) return env->features[FEAT_8000_0001_ECX] & CPUID_EXT3_SVM; } +/* + * In order for a vCPU to enter VMX operation it must have CR4.VMXE set. + * Since it was set, CR4.VMXE must remain set as long as vCPU is in + * VMX operation. This is because CR4.VMXE is one of the bits set + * in MSR_IA32_VMX_CR4_FIXED1. + * + * There is one exception to above statement when vCPU enters SMM mode. + * When a vCPU enters SMM mode, it temporarily exit VMX operation and + * may also reset CR4.VMXE during execution in SMM mode. + * When vCPU exits SMM mode, vCPU state is restored to be in VMX operation + * and CR4.VMXE is restored to it's original value of being set. + * + * Therefore, when vCPU is not in SMM mode, we can infer whether + * VMX is being used by examining CR4.VMXE. Otherwise, we cannot + * know for certain. + */ +static inline bool cpu_vmx_maybe_enabled(CPUX86State *env) +{ + return cpu_has_vmx(env) && + ((env->cr[4] & CR4_VMXE_MASK) || (env->hflags & HF_SMM_MASK)); +} + /* fpu_helper.c */ void update_fp_status(CPUX86State *env); void update_mxcsr_status(CPUX86State *env); diff --git a/target/i386/kvm.c b/target/i386/kvm.c index 4e2c8652168f..d3af445eeb5d 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -128,6 +128,11 @@ bool kvm_has_adjust_clock_stable(void) return (ret == KVM_CLOCK_TSC_STABLE); } +bool kvm_has_exception_payload(void) +{ + return has_exception_payload; +} + bool kvm_allows_irq0_override(void) { return !kvm_irqchip_in_kernel() || kvm_has_gsi_routing(); @@ -1341,7 +1346,6 @@ static int hyperv_init_vcpu(X86CPU *cpu) } static Error *invtsc_mig_blocker; -static Error *nested_virt_mig_blocker; #define KVM_MAX_CPUID_ENTRIES 100 @@ -1640,22 +1644,6 @@ int kvm_arch_init_vcpu(CPUState *cs) !!(c->ecx & CPUID_EXT_SMX); } - if (cpu_has_vmx(env) && !nested_virt_mig_blocker && - ((kvm_max_nested_state_length() <= 0) || !has_exception_payload)) { - error_setg(&nested_virt_mig_blocker, - "Kernel do not provide required capabilities for " - "nested virtualization migration. " - "(CAP_NESTED_STATE=%d, CAP_EXCEPTION_PAYLOAD=%d)", - kvm_max_nested_state_length() > 0, - has_exception_payload); - r = migrate_add_blocker(nested_virt_mig_blocker, &local_err); - if (local_err) { - error_report_err(local_err); - error_free(nested_virt_mig_blocker); - return r; - } - } - if (env->mcg_cap & MCG_LMCE_P) { has_msr_mcg_ext_ctl = has_msr_feature_control = true; } @@ -1670,7 +1658,7 @@ int kvm_arch_init_vcpu(CPUState *cs) if (local_err) { error_report_err(local_err); error_free(invtsc_mig_blocker); - goto fail2; + return r; } } } @@ -1741,8 +1729,6 @@ int kvm_arch_init_vcpu(CPUState *cs) fail: migrate_del_blocker(invtsc_mig_blocker); - fail2: - migrate_del_blocker(nested_virt_mig_blocker); return r; } diff --git a/target/i386/kvm_i386.h b/target/i386/kvm_i386.h index 3057ba4f7d19..06fe06bdb3d6 100644 --- a/target/i386/kvm_i386.h +++ b/target/i386/kvm_i386.h @@ -35,6 +35,7 @@ bool kvm_allows_irq0_override(void); bool kvm_has_smm(void); bool kvm_has_adjust_clock_stable(void); +bool kvm_has_exception_payload(void); void kvm_synchronize_all_tsc(void); void kvm_arch_reset_vcpu(X86CPU *cs); void kvm_arch_do_init_vcpu(X86CPU *cs); diff --git a/target/i386/machine.c b/target/i386/machine.c index 20bda9f80154..c04021937722 100644 --- a/target/i386/machine.c +++ b/target/i386/machine.c @@ -7,6 +7,7 @@ #include "hw/isa/isa.h" #include "migration/cpu.h" #include "hyperv.h" +#include "kvm_i386.h" #include "sysemu/kvm.h" #include "sysemu/tcg.h" @@ -232,10 +233,25 @@ static int cpu_pre_save(void *opaque) } #ifdef CONFIG_KVM - /* Verify we have nested virtualization state from kernel if required */ - if (kvm_enabled() && cpu_has_vmx(env) && !env->nested_state) { - error_report("Guest enabled nested virtualization but kernel " - "does not support saving of nested state"); + /* + * In case vCPU may have enabled VMX, we need to make sure kernel have + * required capabilities in order to perform migration correctly: + * + * 1) We must be able to extract vCPU nested-state from KVM. + * + * 2) In case vCPU is running in guest-mode and it has a pending exception, + * we must be able to determine if it's in a pending or injected state. + * Note that in case KVM don't have required capability to do so, + * a pending/injected exception will always appear as an + * injected exception. + */ + if (kvm_enabled() && cpu_vmx_maybe_enabled(env) && + (!env->nested_state || + (!kvm_has_exception_payload() && (env->hflags & HF_GUEST_MASK) && + env->exception_injected))) { + error_report("Guest maybe enabled nested virtualization but kernel " + "does not support required capabilities to save vCPU " + "nested state"); return -EINVAL; } #endif