From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B821225A63B for ; Mon, 27 Jan 2025 18:32:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738002742; cv=none; b=q87UYOCAJUa5Q1S1U+eNyBmW3GGrM5JpJx/O7pm1w+gnlGSPh2r1nqjffY37SpK/zcdpo5w/ZV4YycuZ5tiLrUkZgP/QmMbFAW9oG64DkOP4qScsBLtGuiRQi7IOT4aPFwLQkQQT8T0fm41b6YW3vmvBkfEZwx7rVxajVUM3NfU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738002742; c=relaxed/simple; bh=iY7lbnlCU1dMWdDNlXzpOIXicbjDgROlkJWby+mI2oA=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=IuMN48guaj4mGTJK1qT49fXsuxmECGwINbSp6WH2jdanIJSopaBiI6jncToy0VIC2zYGtSXhRqCHkGHECGX8pnmDibSWANt0r6GikhQKbMm6ZWpRbhgjk/vXoJJRfy/0+EeIRgs2MhYxDXKejhZhBp2UPsAOGVOj/OCiiV4W+Ac= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LZJqtakt; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LZJqtakt" Received: by smtp.kernel.org (Postfix) with ESMTPS id 2A3DEC4CEE8 for ; Mon, 27 Jan 2025 18:32:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1738002742; bh=iY7lbnlCU1dMWdDNlXzpOIXicbjDgROlkJWby+mI2oA=; h=From:To:Subject:Date:In-Reply-To:References:From; b=LZJqtakt7ujn5OgtWfChm3lZKBwaOpgD641ZKWRWTDnF+uuz7yiLSsZuh3bCqPlwl d6+L80mVilC6hXOf0FC8S+P/++2mUO2J/lH7/IZUOjgEzYXCKCel+0GJu/Xm3RN68S qXPxteh7AjxwKrrjLUnC8UUObeeq2e3LwIaCTxLULqR01WsCiVt1KWGwzit8QZBvz/ ttsjLjZSShnjU5kz7sKuVEMM1aDYKTbhAfLUCL0RdnZ2JPAApFYwVVgmorJx8Vg2Oa eGDDrztjsFMz7kI1+1gFx9J+UG3+9mKmD3AbBTOXKXTDrvsjb6PF1MLPXc+3VZx0zq CTesh0ae7hxsA== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 232A5C3279F; Mon, 27 Jan 2025 18:32:22 +0000 (UTC) From: bugzilla-daemon@kernel.org To: kvm@vger.kernel.org Subject: [Bug 218267] [Sapphire Rapids][Upstream]Boot up multiple Windows VMs hang Date: Mon, 27 Jan 2025 18:32:21 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: AssignedTo virtualization_kvm@kernel-bugs.osdl.org X-Bugzilla-Product: Virtualization X-Bugzilla-Component: kvm X-Bugzilla-Version: unspecified X-Bugzilla-Keywords: X-Bugzilla-Severity: high X-Bugzilla-Who: seanjc@google.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: virtualization_kvm@kernel-bugs.osdl.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 https://bugzilla.kernel.org/show_bug.cgi?id=3D218267 --- Comment #12 from Sean Christopherson (seanjc@google.com) --- I'm not terribly concerned about the complexity, I'm more concerned about t= he efficacy of a software workaround, and to a lesser extent the risk of doing more harm than good (this seems unlikely though). E.g. if an exit that _ca= n_ occur during vectoring collides with the bug, then KVM will inject a spurio= us fault into the guest. And if our list of "impossible" exits is wrong, KVM could incorrectly suppress an exception. I suppose we could mitigate the efficacy concerns by emitting a pr_err_once= () to suggest a ucode update if the erratum is hit. --=20 You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.=