From: sashiko-bot@kernel.org
To: "Omar Elghoul" <oelghoul@linux.ibm.com>, linux-s390@vger.kernel.org
Cc: "Heiko Carstens" <hca@linux.ibm.com>,
"Vasily Gorbik" <gor@linux.ibm.com>,
"Alexander Gordeev" <agordeev@linux.ibm.com>,
"Christian Borntraeger" <borntraeger@linux.ibm.com>
Subject: Re: [PATCH v10 4/5] s390/pci: Fence FMB enable/disable via debugfs for passthrough devices
Date: Tue, 20 Oct 2026 22:33:47 +0000 [thread overview]
Message-ID: <sashiko-outbox-179533@kernel.org> (raw)
In-Reply-To: <20261020212427.2561-5-oelghoul@linux.ibm.com>
> 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.
>
> For VFIO devices that are not associated with a KVM (i.e., for userspace
> drivers other than QEMU), this fence does not take effect.
>
> Signed-off-by: Omar Elghoul <oelghoul@linux.ibm.com>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261020212427.2561-1-oelghoul@linux.ibm.com?part=4
next prev parent reply other threads:[~2026-10-20 22:33 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-20 21:24 [PATCH v10 0/5] vfio-pci/zdev: Improved zPCI Function Measurement Support Omar Elghoul
2026-10-20 21:24 ` [PATCH v10 1/5] s390/pci: Hold fmb_lock when enabling or disabling PCI devices Omar Elghoul
2026-10-20 22:35 ` sashiko-bot
2026-10-20 21:24 ` [PATCH v10 2/5] s390/pci: Reuse FMB buffer across enable and disable cycles Omar Elghoul
2026-10-20 22:35 ` sashiko-bot
2026-10-20 21:24 ` [PATCH v10 3/5] s390/pci: Improve function measurement state management Omar Elghoul
2026-10-20 22:53 ` sashiko-bot
2026-10-20 21:24 ` [PATCH v10 4/5] s390/pci: Fence FMB enable/disable via debugfs for passthrough devices Omar Elghoul
2026-10-20 22:33 ` sashiko-bot [this message]
2026-10-20 21:24 ` [PATCH v10 5/5] vfio-pci/zdev: Add VFIO FMB device features Omar Elghoul
2026-10-20 22:46 ` sashiko-bot
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