From nobody Wed Apr 8 04:44:47 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 D9D5C364931 for ; Wed, 11 Mar 2026 00:33:59 +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=1773189241; cv=none; b=BzIcimPD9kuySX55RDvT8vcxc1Paz46+F3eZCNHMhUBWlZ2ACJMptAEC3jwdaKKL5nHRv8t84TCt+yyxS1/U3CfoBJOl5u9yoH90PM8mNihK8iYehNo4A1bza45bEcdougC/nohEyoHN7uOr2hw+ikzZRlT3THC7n3UOKyymEBY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773189241; c=relaxed/simple; bh=LACfdw/zW10Jq2WOM8fA9MujAFua+8h+3eY59ooXrwQ=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=ldNjSZRDCLnrQw8lVX0wo705RnlvXoZjxsYud0XxFiimdtAIcXmEY27sR3P7xsxvoQX3EHmNQ5H1IoZIR/qh0PsB9LdVcpGnwGNDC+IjmerDAosPEAgEd1kqSPr5M5e68xbTjPIDCdlm8cz4+BUsy+5+bAZMR2omA2wCSH2EdpY= 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=Jkbq/2Jy; 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="Jkbq/2Jy" Received: by mail-pj1-f74.google.com with SMTP id 98e67ed59e1d1-35979a03106so10722697a91.1 for ; Tue, 10 Mar 2026 17:33:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1773189239; x=1773794039; 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=/u7P5DGbuL3/Pf42zn0rgLVQxjHAQYab6nCFQbQkuh4=; b=Jkbq/2Jy60rHeJbj+EUjMqftsPLmsFxLbPQISUAmx+Tb4oDaggiwou+y23HYkV9SJp tj10gzwwt/36E+/VsCe6UUVoZa/8jBw2NN7wuHBi3v4UvccoHAP6w0fhwSLuFUcfOa8K Id3IS9gt7B/Luukm5zsbgFUoxQt7bUCS+o9cql4qGBXMPpEDhmF2uyUcpse8NWS9USLZ Su+/Jqam+X0hOGsLeG8Q/c3gPYoH8QUjg02NY2T9mc9r9t6ko64FEmhTrDcCG3jdqvbP n1BZweUVBAowPAv3Vym3SmEzNXl8GURlsMT6OSKCIxUv1oqGo6D0wqzwq3QL94J2pyZd hKrw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1773189239; x=1773794039; 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=/u7P5DGbuL3/Pf42zn0rgLVQxjHAQYab6nCFQbQkuh4=; b=mSKtUcPh7oZaMIF62YypmxJRVsJYpD2Dn8HVWujO9pRjJkjXTlmDv6qGTyHHfPNEIs mR3QTv8CLxIfZrpntqEWxVlL27Bi3avVBfgMFsJoSbbk0Yzl3aeyJrtwa0U86VLxTwOA 39kNpgOIJg6cHU0YFq743R681Br7JWCZu4GnoToneLXy94XxNV7PCVIluoQSbhlvPrm4 una5FEelVAzqWqq0At890HqliJ/lM6EXhCTeejb9+hGM5H4X1N4sJKNmhYHE3KdEOlwy p6IItveKSZhYDs+jOShVwxcR5gIjLWx1lAFk9g7KW6mSuCvBu8xMDuvuBc0gXiwHFVSk u9gg== X-Forwarded-Encrypted: i=1; AJvYcCUi7YBzwcl1SckY1AzF/WmGEcWSVevIu5XCtjMXlS3ZTwL3ivPNKG7TX0LbLKSkyzGjqSHu5seyzRCZza8=@vger.kernel.org X-Gm-Message-State: AOJu0YzVS9r9tzAWAV5wVvrhRMQ/bd8N2wS/LM31X/eUrvHdls0r1Q6p 49yrWcMU9R7IRlzs9GeayQVxlmiJPBfJtomC/78N00xrPsKmfm2MXwG2uUplHRk/TxJJGAdK/lO QvV7tEQ== X-Received: from pgbs189.prod.google.com ([2002:a63:5ec6:0:b0:c73:999d:a1d5]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:2d83:b0:359:981b:5dd2 with SMTP id 98e67ed59e1d1-35a0124d192mr631149a91.14.1773189239132; Tue, 10 Mar 2026 17:33:59 -0700 (PDT) Reply-To: Sean Christopherson Date: Tue, 10 Mar 2026 17:33:42 -0700 In-Reply-To: <20260311003346.2626238-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260311003346.2626238-1-seanjc@google.com> X-Mailer: git-send-email 2.53.0.473.g4a7958ca14-goog Message-ID: <20260311003346.2626238-4-seanjc@google.com> Subject: [PATCH 3/7] KVM: nVMX: Do a bitwise-AND of regs_avail when switching active VMCS From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini , Kiryl Shutsemau Cc: kvm@vger.kernel.org, x86@kernel.org, linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, "Chang S . Bae" Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When switching between vmcs01 and vmcs02, do a bitwise-AND of regs_avail to effectively reset the mask for the new VMCS, purely to be consistent with all other "full" writes of regs_avail. In practice, a straight write versus a bitwise-AND will yield the same result, as kvm_arch_vcpu_create() marks *all* registers available (and dirty), and KVM never marks registers unavailable unless they're lazily loaded. This will allow adding wrapper APIs to set regs_{avail,dirty} without having to add special handling for a nVMX use case that doesn't exist in practice. Signed-off-by: Sean Christopherson --- arch/x86/kvm/vmx/nested.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index 942acc46f91d..af2aaef38502 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -310,7 +310,7 @@ static void vmx_switch_vmcs(struct kvm_vcpu *vcpu, stru= ct loaded_vmcs *vmcs) vmx_sync_vmcs_host_state(vmx, prev); put_cpu(); =20 - vcpu->arch.regs_avail =3D ~VMX_REGS_LAZY_LOAD_SET; + vcpu->arch.regs_avail &=3D ~VMX_REGS_LAZY_LOAD_SET; =20 /* * All lazily updated registers will be reloaded from VMCS12 on both --=20 2.53.0.473.g4a7958ca14-goog