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bh=zOVrqFaIjxStr+PddGZDDIzWeEXAekGQoynx9FQL124=; b=HQO7Y2hZIkeKUVwscc7MHfn9XrQGxlvrJOFy+ZxvSbDQh1h8cLkWpao46Xvqilk3VJlaBR CZIky+JPCpszxFtm/KLTKLUGeDB+GgAsHtNnIAxr3NF5OODG1Gr6QsoTe2vfUBLPYJhKU4 TMtOkIScxuwyt8uM8D6VsO7RwnjJFQk= X-MC-Unique: L88jZe1ONfC8MRe4BAtWQA-1 From: Vitaly Kuznetsov To: qemu-devel@nongnu.org, Paolo Bonzini Cc: Sean Christopherson Subject: [PATCH RFC v1 1/2] i386: reset KVM nested state upon CPU reset Date: Wed, 10 Aug 2022 16:00:06 +0200 Message-Id: <20220810140007.1036293-2-vkuznets@redhat.com> In-Reply-To: <20220810140007.1036293-1-vkuznets@redhat.com> References: <20220810140007.1036293-1-vkuznets@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 2.85 on 10.11.54.9 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=vkuznets@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1660141924735100001 Content-Type: text/plain; charset="utf-8" Make sure env->nested_state is cleaned up when a vCPU is reset, it may be stale after an incoming migration, kvm_arch_put_registers() may end up failing or putting vCPU in a weird state. Signed-off-by: Vitaly Kuznetsov Reviewed-by: Maxim Levitsky --- target/i386/kvm/kvm.c | 37 +++++++++++++++++++++++++++---------- 1 file changed, 27 insertions(+), 10 deletions(-) diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index f148a6d52fa4..4f8dacc1d4b5 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -1695,6 +1695,30 @@ static void kvm_init_xsave(CPUX86State *env) env->xsave_buf_len); } =20 +static void kvm_init_nested_state(CPUX86State *env) +{ + struct kvm_vmx_nested_state_hdr *vmx_hdr; + uint32_t size; + + if (!env->nested_state) { + return; + } + + size =3D env->nested_state->size; + + memset(env->nested_state, 0, size); + env->nested_state->size =3D size; + + if (cpu_has_vmx(env)) { + env->nested_state->format =3D KVM_STATE_NESTED_FORMAT_VMX; + vmx_hdr =3D &env->nested_state->hdr.vmx; + vmx_hdr->vmxon_pa =3D -1ull; + vmx_hdr->vmcs12_pa =3D -1ull; + } else if (cpu_has_svm(env)) { + env->nested_state->format =3D KVM_STATE_NESTED_FORMAT_SVM; + } +} + int kvm_arch_init_vcpu(CPUState *cs) { struct { @@ -2122,19 +2146,10 @@ int kvm_arch_init_vcpu(CPUState *cs) assert(max_nested_state_len >=3D offsetof(struct kvm_nested_state,= data)); =20 if (cpu_has_vmx(env) || cpu_has_svm(env)) { - struct kvm_vmx_nested_state_hdr *vmx_hdr; - env->nested_state =3D g_malloc0(max_nested_state_len); env->nested_state->size =3D max_nested_state_len; =20 - if (cpu_has_vmx(env)) { - env->nested_state->format =3D KVM_STATE_NESTED_FORMAT_VMX; - vmx_hdr =3D &env->nested_state->hdr.vmx; - vmx_hdr->vmxon_pa =3D -1ull; - vmx_hdr->vmcs12_pa =3D -1ull; - } else { - env->nested_state->format =3D KVM_STATE_NESTED_FORMAT_SVM; - } + kvm_init_nested_state(env); } } =20 @@ -2199,6 +2214,8 @@ void kvm_arch_reset_vcpu(X86CPU *cpu) /* enabled by default */ env->poll_control_msr =3D 1; =20 + kvm_init_nested_state(env); + sev_es_set_reset_vector(CPU(cpu)); } =20 --=20 2.37.1 From nobody Fri May 3 13:54:01 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; 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Wed, 10 Aug 2022 14:00:12 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.40.194.21]) by smtp.corp.redhat.com (Postfix) with ESMTP id 326D5492C3B; Wed, 10 Aug 2022 14:00:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1660140078; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=0tdCM5vKV1BcfXVNshc9f+y0jmZSwpZA+iGbwzlc/zQ=; b=UvY10FI3Xow8KxEequfKkdcdszLTxyIdemChuOKCsJQsAY51kR7er7aTWglWuejg/IY/jI sjXhZqvBw5WmLde/FJCXgfc53ua4+lwmC9/OuPrsqar5zxhl0VCm/Eiz2Edhe5Wniw8KcN nw5nHBb3IZXgyjKWdf6P3eTylfIiEbk= X-MC-Unique: sck4XjFrN8CREdUrT3bN9w-1 From: Vitaly Kuznetsov To: qemu-devel@nongnu.org, Paolo Bonzini Cc: Sean Christopherson Subject: [PATCH RFC v1 2/2] i386: reorder kvm_put_sregs2() and kvm_put_nested_state() when vCPU is reset Date: Wed, 10 Aug 2022 16:00:07 +0200 Message-Id: <20220810140007.1036293-3-vkuznets@redhat.com> In-Reply-To: <20220810140007.1036293-1-vkuznets@redhat.com> References: <20220810140007.1036293-1-vkuznets@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 2.85 on 10.11.54.9 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=vkuznets@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1660140794281100001 Content-Type: text/plain; charset="utf-8" Setting nested state upon migration needs to happen after kvm_put_sregs2() to e.g. have EFER.SVME set. This, however, doesn't work for vCPU reset: when vCPU is in VMX root operation, certain CR bits are locked and kvm_put_sregs2() may fail. As nested state is fully cleaned up upon vCPU reset (kvm_arch_reset_vcpu() -> kvm_init_nested_state()), calling kvm_put_nested_state() before kvm_put_sregs2() is OK, this will ensure that vCPU is *not* in VMX root opertaion. Signed-off-by: Vitaly Kuznetsov Reviewed-by: Maxim Levitsky --- target/i386/kvm/kvm.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index 4f8dacc1d4b5..73e3880fa57b 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -4529,18 +4529,34 @@ int kvm_arch_put_registers(CPUState *cpu, int level) =20 assert(cpu_is_stopped(cpu) || qemu_cpu_is_self(cpu)); =20 - /* must be before kvm_put_nested_state so that EFER.SVME is set */ + /* + * When resetting a vCPU, make sure to reset nested state first to + * e.g clear VMXON state and unlock certain CR4 bits. + */ + if (level =3D=3D KVM_PUT_RESET_STATE) { + ret =3D kvm_put_nested_state(x86_cpu); + if (ret < 0) { + return ret; + } + } + ret =3D has_sregs2 ? kvm_put_sregs2(x86_cpu) : kvm_put_sregs(x86_cpu); if (ret < 0) { return ret; } =20 - if (level >=3D KVM_PUT_RESET_STATE) { + /* + * When putting full CPU state, kvm_put_nested_state() must happen aft= er + * kvm_put_sregs{,2} so that e.g. EFER.SVME is already set. + */ + if (level =3D=3D KVM_PUT_FULL_STATE) { ret =3D kvm_put_nested_state(x86_cpu); if (ret < 0) { return ret; } + } =20 + if (level >=3D KVM_PUT_RESET_STATE) { ret =3D kvm_put_msr_feature_control(x86_cpu); if (ret < 0) { return ret; --=20 2.37.1