From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 7C1B0381EB4; Wed, 7 Oct 2026 14:06:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791382018; cv=none; b=Hb7xOyygeUOpD376CAWUux8EWi58NcxfzotjTnb2iXmc96SqMM62yWgyuI0EHczNajSrl/Xde6wkMErQpHuqA5bYWodH9ZO6eGvWHmaZ80qweMxCE+92MaDk96WCMH4nk598PY5VUCUozqhqW/zWsfqlfu+gQ6DjB24Fo7u0PLw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791382018; c=relaxed/simple; bh=+wSgnlX/eCvtxXODQeQhUeFBKYk7WPyQFeeuxyG2GV4=; h=Message-ID:From:Subject:To:Cc:In-Reply-To:References:Content-Type: Date; b=CE/N8PpXI+d+f9UxoNrM6B49NbEJzXJj2QODPUX0iIth4kVVU9hEM2miaSuw0mhc2jOPdFhPQPUnafOFeW/0hbi47veIi+qOIREULtPSeep5DdrJW0TamoQ/5mjAs7D6bYg/Kw4SDzXPjwiglx77HqcqByXMCOeRCqlo6+614DI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=et7H54Js; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="et7H54Js" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 909DB1F0089B; Wed, 7 Oct 2026 14:06:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1791382008; bh=+wSgnlX/eCvtxXODQeQhUeFBKYk7WPyQFeeuxyG2GV4=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=et7H54Js4n0IwLL8/P7kl2Q5JzoVF+eL6KIIpTqhfMbiNuZ6WH92zFEJieXlxLbVf PUYUESCais/gRB+HcqCgI06bIsl6LAguoJxpF2I3A+xLq6fcTyce84JpoG1fYy/unr bDsSN/hB1/5eckZ3IyFEaqpdAJ59HS5KpwTUF9VL0H/zncMZ0+jJowIRfM9uaKHDaf P35m+FV5D4mf79QRrm84iuYnTVPfi4RcbmIQNwIPk5Zy2kTOduUfvpOgP0IGMbNeUu 6+nqfUW6tIW/XlxzDK/G0Tm1WqEZjS861tJEudlX288pSiguK/a3Z3vj0U3p8lVomX ExS7uSmprk51Q== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [PATCH v9 3/4] s390/pci: Fence FMB enable/disable via debugfs for passthrough devices Reply-To: sashiko-reviews@lists.linux.dev To: "Omar Elghoul" Cc: "Christian Borntraeger" , "Alexander Gordeev" , kvm@vger.kernel.org, "Heiko Carstens" , "Vasily Gorbik" , linux-s390@vger.kernel.org In-Reply-To: <20261007135926.82935-4-oelghoul@linux.ibm.com> References: <20261007135926.82935-1-oelghoul@linux.ibm.com> <20261007135926.82935-4-oelghoul@linux.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Wed, 07 Oct 2026 14:06:48 +0000 Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: > Introduce a fence over enabling or disabling FMB via debugfs when the zPCI > device is associated with a KVM. This will prevent processes on the host > from tampering with the FMB while the guest is still using it, which may > cause partial counter resets and inconsistent reads which have no parallel > in the architecture. >=20 > For VFIO devices that are not associated with a KVM (i.e., for userspace > drivers other than QEMU), this fence does not take effect. >=20 > Signed-off-by: Omar Elghoul Sashiko has reviewed this patch and found no issues. It looks great! --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20261007135926.8293= 5-1-oelghoul@linux.ibm.com?part=3D3