From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f202.google.com (mail-pg1-f202.google.com [209.85.215.202]) (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 896F3397E68 for ; Thu, 9 Apr 2026 22:42:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775774575; cv=none; b=AZ64ccLnMqtTtTkUFFihido9tvoo/2R8ccaIIpqM1Ov3SlMzY9NdUi51JIsDknkVt6mkeEwjYjYVBmh5V+0uQRGZRnnFQR3rKkn/J10U3OcnU9KSaC3BQD9+5dVmBRMr8iYj7+dOexIs4+TZiL/LjbFwVjsT5YYTQNdpMYVFz9Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775774575; c=relaxed/simple; bh=Cfxa2UAE6j7eG3LqQr4Mhci8tHPj0OKBsNtcqmiHvgI=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=MsNlqcv/6qLl3Xvv1bqOFJPafJWvYs5LmRZhP2FEB6ggZkqx1una3n4MPMYPMilWSfjwti292IFEcf5QKj/MBfIo+O/1enhSDJ5H6VG02GrDVX5TCGo/CfV7gnag7rrkAWBWZhI75BvTKiMNw/fWSa8geNdDJVXxJDrrGNlVdiQ= 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=cAJ5+wST; arc=none smtp.client-ip=209.85.215.202 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="cAJ5+wST" Received: by mail-pg1-f202.google.com with SMTP id 41be03b00d2f7-c741c4cebf3so689358a12.2 for ; Thu, 09 Apr 2026 15:42:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1775774573; x=1776379373; 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=dy1xR7/tBUVQ93pwLppnnl1roCB8CkMUcZoZrxWj4Ak=; b=cAJ5+wSTxAeEQw2sYFDuWOOjkztukurVzKIvbQQ0gaZVMVf0qSiTpusnxUUwn5b/zj JJTg6ZMSnhZElHat62CxdxGr7QJPQGs68+99uY5UVd+JHSc7XYvTk+6F0J7GIFfNxyTw lkpZLbHZpCIwxiNwdV6FKYmgr26WNd7CKrgo+LJH+G8X1ZqW4lvjk9/XhqmNniIb5I6E qHt/LxRGTJ+XB2V47powtHFuLuHA7USBTfNrEpQZkh8Yknx6WadN3jeIPWR18wjMf+Gb /nDxz+rF9TLjJJ+4PydJh1QlXnkftpLCH76EnibUxlk7bEQqMykugV0NZghchGcCsiu/ xtPA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775774573; x=1776379373; 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=dy1xR7/tBUVQ93pwLppnnl1roCB8CkMUcZoZrxWj4Ak=; b=lvlIUzh1PM0yQSfSEJ08zXwA4zSo51rD21ytlOrUS9AF66ZKyxYE9edsoQyD/Ztzgj D1g+mI8xxr2YOlwSSviuy7xqQ3wQFcurUIjxrxZRzKQ0PeYoKyUXZdbtCaQRVhx4EVR7 xV6Zeb391GM/YhaP0zuMdHS4U2htOYjPDua/Z1aWak2TPjjriZTtD3fgnlBgqkZgoMEn A7st7bfAYsV3kNwxHXe5bnUWnwsCobwhSz3WVEBslYt/Zy8X0HTeGBOojTDK5DBpehMi jUkE0DsaqH0BHBPfhPTfee34hRrDiyqJS8QNFj8Y/vFgPDsOYFoCGU9/GL8ZQrvamZ5W n9cA== X-Gm-Message-State: AOJu0YxrRksO6/qHPe30C0dq96/b1Zybt7o0v+5kdhckjTCizsa7Ay24 hXNobEFRR0v01vg3UKOSBCqWUCOqaKHWGQ/sRxOYFRHVs0eHSttxYM7eS03HElkocx2MyG0SsqM cSrgjhA== X-Received: from pghv6.prod.google.com ([2002:a63:f206:0:b0:c73:7970:8223]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:9981:b0:39f:43c3:b8b9 with SMTP id adf61e73a8af0-39fe40d7f36mr740699637.57.1775774572752; Thu, 09 Apr 2026 15:42:52 -0700 (PDT) Reply-To: Sean Christopherson Date: Thu, 9 Apr 2026 15:42:32 -0700 In-Reply-To: <20260409224236.2021562-1-seanjc@google.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260409224236.2021562-1-seanjc@google.com> X-Mailer: git-send-email 2.53.0.1213.gd9a14994de-goog Message-ID: <20260409224236.2021562-4-seanjc@google.com> Subject: [PATCH v2 3/6] 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-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 22b1f06a9d40..63c4ca8c97d5 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, struct loaded_vmcs *vmcs) vmx_sync_vmcs_host_state(vmx, prev); put_cpu(); - vcpu->arch.regs_avail = ~VMX_REGS_LAZY_LOAD_SET; + vcpu->arch.regs_avail &= ~VMX_REGS_LAZY_LOAD_SET; /* * All lazily updated registers will be reloaded from VMCS12 on both -- 2.53.0.1213.gd9a14994de-goog