From nobody Mon Feb 9 13:58:47 2026 Received: from mail-pj1-f74.google.com (mail-pj1-f74.google.com [209.85.216.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D14E432694A for ; Thu, 13 Nov 2025 22:56:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763074592; cv=none; b=n89SFFaCXC31xgdNPS1xOl12pPJhbOlu52d/BPIZn9DpEIyfuNTjM+7023LfN4dUNyHtIQ7lZDIaY0LUzy0qHT9TrBfaUGUMjHorBwQqz6i31vcb1x5pCIzGmoLwCdKL14uATJ3RXBo1R2IUKslL4n7UstpHG6HEmp07//kjH2o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763074592; c=relaxed/simple; bh=DZnTVcVd7ilWEk7QprLP8HYWZGe/PyhrQBrHuLnfjVw=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=jtDXQ6lfqfA2Ypg6Mn/zFUvrfMJ3EFsn+gKh+Hlj2/OcecY4QI5ljiEptPqxXq1fveYvm4z9xFsMuyYTxklzXw9CwWZYwKsXDg0h7CHkr//bkJNVIFGsd1sPWzj5kWiny/6yYv4FFd+EHbiRzrP0KO92dhsK0u9qHMYlh2rCvV8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=sPElYpZ5; arc=none smtp.client-ip=209.85.216.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="sPElYpZ5" Received: by mail-pj1-f74.google.com with SMTP id 98e67ed59e1d1-34377900dbcso1954318a91.2 for ; Thu, 13 Nov 2025 14:56:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1763074590; x=1763679390; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=BxKLVgWi122XtoiJoBFjxbdILt6Adpgcci0Yx4/UOzI=; b=sPElYpZ5qbvV7CgEjpxR2Dy+Yl7szuBZgwNYaWy7bX08vGSH4hqLRjN8hCBCmGFA6E ViaUerATWkBPozqP8UG4ROfuD4fUzQ4HN7Y+61kXldp6XSMu36u/SgM+soTLymGDemlx 6rV00Rfozndc+gqSNdJM2XdTNuku/sU9KDTxEmusKUT5PqCwPk1NCMMWlnWosAw7+9Ak BRz4NRJi4Aphhbo1FFUy01HDjmrLpnuscxbxa/i1GmbbKEinTZcjDRcC/w4ppfODqBJX yY5irAT5Pxb2w4V+dEN6A2OGa4UdRWgG2BQ9bXhMI+vZpIW5WtFwAAiVz01YYnO8IaUq nA4g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763074590; x=1763679390; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=BxKLVgWi122XtoiJoBFjxbdILt6Adpgcci0Yx4/UOzI=; b=tjhvofDTcGbMGaLBp7XTaaX5a+elxHWkSSMgBkMfm70XAPDEi6eU+Cxo0fffjP4OlN f4eOqzB9dIOxBErxRp3OdIIXTUkGzOr3RR6zRA3LAOTZe5RN9X/+A34WF1baUsqGCZXI tslu4TQg49rFsBmm6Qw+nW7jx2gQcJJqeI0JmEi7n/nWmR2fzT3Q08kHr6Na/O2gBuJ/ nU9jcNJNPRDru0bMpNNCIaBZ1n8sTYaVk0KDoN8y85kcbr3mr022Pg4i/uDvOa1BnSVS B+G+qNDvNPGyWRmmU+7GNc7GunFcWMSIgQv0v92h61DntpJl+T3VbXUfvKN0I+YWVXk2 Zehg== X-Forwarded-Encrypted: i=1; AJvYcCXCRzs8sNEC4Mn1It1EOBUU136XW4ldeNsNEruOL86ds2GQbYUFkod+rgyKFapcFg8bKI4FuWfLbgy6fSk=@vger.kernel.org X-Gm-Message-State: AOJu0YxgCTMWHdNqoZsOF6TvdlZycvKkn1nr//oNsIKFrtw27OTHkB71 MnJJW5th3AKse2MIvH+iJjPpGRRtSItV5576jOZ9TGFS2OkGglKsMXBGhrVlEGnNzU1Ev8XZrEX SXEh+zg== X-Google-Smtp-Source: AGHT+IFiv3A2MIePSw/tKTb0y96BVRTrr/TBLsOXY9EWmbc08jEkv0VCYdfjj5l0yUt5Qx95CRl430wU9PY= X-Received: from pjbgw11.prod.google.com ([2002:a17:90b:a4b:b0:343:641d:e8c3]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:4c48:b0:341:2b78:61b8 with SMTP id 98e67ed59e1d1-343fa637866mr946508a91.20.1763074590204; Thu, 13 Nov 2025 14:56:30 -0800 (PST) Reply-To: Sean Christopherson Date: Thu, 13 Nov 2025 14:56:13 -0800 In-Reply-To: <20251113225621.1688428-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251113225621.1688428-1-seanjc@google.com> X-Mailer: git-send-email 2.52.0.rc1.455.g30608eb744-goog Message-ID: <20251113225621.1688428-2-seanjc@google.com> Subject: [PATCH 1/9] KVM: nSVM: Clear exit_code_hi in VMCB when synthesizing nested VM-Exits From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini , Vitaly Kuznetsov , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui Cc: kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, Jim Mattson , Yosry Ahmed Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Explicitly clear exit_code_hi in the VMCB when synthesizing "normal" nested VM-Exits, as the full exit code is a 64-bit value (spoiler alert), and all exit codes for non-failing VMRUN use only bits 31:0. Cc: Jim Mattson Cc: Yosry Ahmed Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson Reviewed-by: Yosry Ahmed --- arch/x86/kvm/svm/svm.c | 2 ++ arch/x86/kvm/svm/svm.h | 7 ++++--- 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index fc42bcdbb520..7ea034ee6b6c 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -2433,6 +2433,7 @@ static bool check_selective_cr0_intercepted(struct kv= m_vcpu *vcpu, =20 if (cr0 ^ val) { svm->vmcb->control.exit_code =3D SVM_EXIT_CR0_SEL_WRITE; + svm->vmcb->control.exit_code_hi =3D 0; ret =3D (nested_svm_exit_handled(svm) =3D=3D NESTED_EXIT_DONE); } =20 @@ -4608,6 +4609,7 @@ static int svm_check_intercept(struct kvm_vcpu *vcpu, if (static_cpu_has(X86_FEATURE_NRIPS)) vmcb->control.next_rip =3D info->next_rip; vmcb->control.exit_code =3D icpt_info.exit_code; + vmcb->control.exit_code_hi =3D 0; vmexit =3D nested_svm_exit_handled(svm); =20 ret =3D (vmexit =3D=3D NESTED_EXIT_DONE) ? X86EMUL_INTERCEPTED diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index c2acaa49ee1c..253a8dca412c 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -763,9 +763,10 @@ int nested_svm_vmexit(struct vcpu_svm *svm); =20 static inline int nested_svm_simple_vmexit(struct vcpu_svm *svm, u32 exit_= code) { - svm->vmcb->control.exit_code =3D exit_code; - svm->vmcb->control.exit_info_1 =3D 0; - svm->vmcb->control.exit_info_2 =3D 0; + svm->vmcb->control.exit_code =3D exit_code; + svm->vmcb->control.exit_code_hi =3D 0; + svm->vmcb->control.exit_info_1 =3D 0; + svm->vmcb->control.exit_info_2 =3D 0; return nested_svm_vmexit(svm); } =20 --=20 2.52.0.rc1.455.g30608eb744-goog