From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f202.google.com (mail-pl1-f202.google.com [209.85.214.202]) (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 73F35259C9A for ; Thu, 14 Aug 2025 20:25:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755203135; cv=none; b=scN6atEt6t2E+30Lhp/ddJeiCvPegwti58HWJP0n7xZ+xKVYVfCgrL52MwThtiTMxnsnH1YLHNAXZU9tgAT/ZCzq5YVeRZ/5TfYRX3oqimQFgj1PQMBcfYlVTVfRYWuN2wydXVuybKAgrEKpFpXDVq2yODyNC+1yhVcGopYc9w4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755203135; c=relaxed/simple; bh=btRuK0OjDfr6KPijoeCQ8c4lGZWLBPYmMCkWGMtR+oQ=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=IDnPrnMtV1wLYran1WBQxHxgGXei0+dhJleIkKaYrQsK8UwDDvQAOu93Acq8ExatSWTFZRH5v9oJBwYdkU3dJVakXaehAAdPqeCzMha6c8h7lmaikB3gsxfH0Jzgu4VALZSkuK4/eGSNz3tixQSBfH2A2D+z+0zqUj5M+clgyBQ= 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=mAbUgB1C; arc=none smtp.client-ip=209.85.214.202 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="mAbUgB1C" Received: by mail-pl1-f202.google.com with SMTP id d9443c01a7336-24458274406so26954425ad.3 for ; Thu, 14 Aug 2025 13:25:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1755203134; x=1755807934; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=MTrMhBuO9TgAl6EGBA33RiEPTzWN9EC7uvJKmJoNuUM=; b=mAbUgB1CRLYOGzhmrW3QXsGRKQ1zmXHKvDQYUmKGkq6kiQIxmAFKGQPeaB2KQWbfnl kUbKEuFec9HDR0T16+YgvUscgINr21emoMQJNE9Y7t1nZ2yBC5Ww3+HHuZ3T+Fk93AB5 P0fcMvVOsi08XfcHXF4zbAWK/vaKw8TixhjVidYhk3dw16u6RdRvZpNkKnvFqI6lc8nq wUFsenXw33GOPm8V0aUE3HD/t5K2ErE9+mb6NT0jO507jwbdoV8zsE5TaspCLNVWRC/3 7+ctKSz+bUL6vuNr9Uvxj2eT422fv1XfLspnqHI0NT3pDwhpzDJTm5j7RctmOjK07nmr addg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1755203134; x=1755807934; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=MTrMhBuO9TgAl6EGBA33RiEPTzWN9EC7uvJKmJoNuUM=; b=B6eraluhJBuFOaOBlslEO4wW+WLqRg8eu9fK5hjxqUW76juLvX7YO/u16OxnR99XLb LQIrnptCnENDjvgS5+2T1NBB4Q6N4RAMp9ERPPGbOcdTR2hAe6D1nyuPTlw/rMQzGIML 8ydtCbU9KGGchfZNNuns1fnZ+VzU36KkC+ejzSR/6/oVsDEXT7686sPSQkp1A6lgjBjx b+KxVaeX2d3knmQtS9TrSH3i3PO/wibI+gpY8DBUbOkuFA+7Qni6+8+iOMyVTIRqIYXj NyKhiJOSv9f4JRHLCa0fWicij7Z4au9CaDMXGvtH7oghh1azhc0tasaJuTBlfFgnewdU xmOA== X-Gm-Message-State: AOJu0Ywh/MZyWMG+zyPM7HZtTnDwdDe2i5tkkqNDL1J5ukUvy4VoRxwp 45gSN1zkF5zYEZjlPutRWBS/IljV2sQ2lvFFZNdgoPCp3SLFBOOVxVeqSGWvH8p16FIcELpQbhb JbYcmlg== X-Google-Smtp-Source: AGHT+IGzkmhgWa28hmQQxe+zC3SycYO0BgiWcXfU5LMhFn3fiktK+ARtK8Ekw7y92A0BPliF8mX2PehrAqs= X-Received: from pjbqx15.prod.google.com ([2002:a17:90b:3e4f:b0:31f:d4f:b20d]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:1b4c:b0:242:e38c:89db with SMTP id d9443c01a7336-244586c46cfmr70931125ad.35.1755203133769; Thu, 14 Aug 2025 13:25:33 -0700 (PDT) Date: Thu, 14 Aug 2025 13:25:32 -0700 In-Reply-To: <20250724170725.1404455-2-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <2025062034-chastise-wrecking-9a12@gregkh> <20250724170725.1404455-1-sashal@kernel.org> <20250724170725.1404455-2-sashal@kernel.org> Message-ID: Subject: Re: [PATCH 6.1.y 2/3] x86/reboot: KVM: Handle VMXOFF in KVM's reboot callback From: Sean Christopherson To: Sasha Levin Cc: stable@vger.kernel.org, Kai Huang Content-Type: text/plain; charset="us-ascii" On Thu, Jul 24, 2025, Sasha Levin wrote: > From: Sean Christopherson > > [ Upstream commit 119b5cb4ffd0166f3e98e9ee042f5046f7744f28 ] > > Use KVM VMX's reboot/crash callback to do VMXOFF in an emergency instead > of manually and blindly doing VMXOFF. There's no need to attempt VMXOFF > if a hypervisor, i.e. KVM, isn't loaded/active, i.e. if the CPU can't > possibly be post-VMXON. > > Reviewed-by: Kai Huang > Link: https://lore.kernel.org/r/20230721201859.2307736-4-seanjc@google.com > Signed-off-by: Sean Christopherson > Stable-dep-of: a0ee1d5faff1 ("KVM: VMX: Flush shadow VMCS on emergency reboot") > Signed-off-by: Sasha Levin > --- Acked-by: Sean Christopherson