From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f73.google.com (mail-wm1-f73.google.com [209.85.128.73]) (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 1802526E706 for ; Tue, 14 Oct 2025 08:57:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.73 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760432256; cv=none; b=mI8g8xiHvtuug+hHMzaLTldPMxdIOcrw2pg9ddw3zbaF07yCPyNZzik1T2uw/gEBLoJsXMBF7nRndhmJOJzmv1ikZqm6Zz45o04zuEqMbWXkEv82/KdWeFmSWDQr5BIR1kPThWxRAuMgyHQ6/wU9y++3XK8hSsljlk6LcpKcYdA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760432256; c=relaxed/simple; bh=E4F6zCQxofT/ijQ1Lk9Sq4gLTN9jp0PKg+b/gO7SpP8=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=ZakzJjhRcdcOiduDv+i+KhMDhrlBf501uWyDE7rWIkFJyKFaNOYozMwgIMeHccpCFJluvH/pI4xLSyyuu3tz2Lu3DlZUVoI9KGwVy7JX4cMK7Jwz7cw4Z4zxM0gTwmGc2FZjJaMrwSQrTKQwkPxpNea8AZvaxedunRjr7Ah7X0A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--jackmanb.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=i93E5jw8; arc=none smtp.client-ip=209.85.128.73 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--jackmanb.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="i93E5jw8" Received: by mail-wm1-f73.google.com with SMTP id 5b1f17b1804b1-46e4d34ff05so27771615e9.2 for ; Tue, 14 Oct 2025 01:57:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1760432253; x=1761037053; darn=lists.linux.dev; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=E4F6zCQxofT/ijQ1Lk9Sq4gLTN9jp0PKg+b/gO7SpP8=; b=i93E5jw85tXMWgCEttvnE7IcKYBJ4EnUArlvoW7fXLHBsou2eQsGJ9CAxWCnTbttjS akYUwQ3O/cUn23QdqedhFdxxKeXT3OWR3Wo9d8YcEf8fPWTa7iYg2OB4147HLZyrinoC 6HMBblCSTjcrt6IftF6eK34cVoSNGoIHKcgAwgjlnMyV3poJrgH1Gt0001K6v24Vb49C wRYYQ1u1ZCJ8j8rCXmOLDLwcaJ5TF9rf8LgYPxYgfQAOjQhl5Hc3+6zu1+67tytZZcPO +WQES4oBEU8SAmqnJBoQZ71B+wpcdBARYxLccm/7NYkG+5RroIXeeGehG0mFQD2S2o2v 3zYQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1760432253; x=1761037053; 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=E4F6zCQxofT/ijQ1Lk9Sq4gLTN9jp0PKg+b/gO7SpP8=; b=GO2gHXpAyk5vj19SMB3maXekCDTC48YlW1p1gKR/JSln0TmeaL3FcPYlrmOcV7T6mE uhM+GuY//HXSRm8q+nNFUfj/xwpWKvsOSS0uKK0BGWb70VP4lc2k0QqXa2JeyASxPlSJ UJ1/JIxy/PLxU18z+C16vtGue5jfp0+hVXuCscoppNoVo11AHSva3/sdIPEGVzvf4c5q 1Smcqr/zmH0h+nko8TNRf0gMQn1mMU9tRzpbJpbTFTJbY3xdglXswOEccY43H9V1F1IZ aYWeVQpse620iDafaWosj5HE+sgVzEGWj0Hn5r+W7Q5MMgxxWqhiUdgD05Mo4RYwZ2E7 68fw== X-Gm-Message-State: AOJu0YwBjjUeEjUZslRmPyhXuBGvxX6NwJhQKBerZWMmSEgs+OE4Zplg Djrtnv8UaXcAQj8lG3EbUZOTwb+GUcQbpNSCLW0Mwhz+fPHGksGsq9SZXOLVrKGRD/IiOiZeOoC knhU+hYcH15vySQ== X-Google-Smtp-Source: AGHT+IG3ne3PsSqSbyFbnpOiDKEA5Cl7N+bezBY3keJ7BevMSp8mdAb5PmKQd21efPgwnEf76x9mBJX1JTeeNg== X-Received: from wmpj26.prod.google.com ([2002:a05:600c:489a:b0:46e:3921:1b1]) (user=jackmanb job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:6287:b0:46f:b42e:e365 with SMTP id 5b1f17b1804b1-46fb42ee3f5mr101990975e9.39.1760432253068; Tue, 14 Oct 2025 01:57:33 -0700 (PDT) Date: Tue, 14 Oct 2025 08:57:32 +0000 In-Reply-To: <68edea17.050a0220.91a22.01fd.GAE@google.com> Precedence: bulk X-Mailing-List: syzbot@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251013-b4-l1tf-percpu-v1-1-d65c5366ea1a@google.com> <68edea17.050a0220.91a22.01fd.GAE@google.com> X-Mailer: aerc 0.21.0 Message-ID: Subject: Re: [syzbot ci] Re: KVM: x86: Unify L1TF flushing under per-CPU variable From: Brendan Jackman To: syzbot ci , , , , , , , , , , , Cc: , Content-Type: text/plain; charset="UTF-8" On Tue Oct 14, 2025 at 6:13 AM UTC, syzbot ci wrote: > BUG: using __this_cpu_write() in preemptible code in x86_emulate_instruction Ah. And now I realise I never booted my debug config on an actual Skylake host, I'd better do that, presumably running the KVM selftests with DEBUG_PREEMPT etc would have been enough to catch this earlier. Anyway, I guest we just want to use vcpu->arch.last_vmentry_cpu instead of smp_processor_id()?