Can confirm. Reverting f9e54c3a2f5b from v6.13-rc1 fixed the problem.
-------- Original Message --------
On 23/12/24 04:06, Bjorn Helgaas <helgaas@xxxxxxxxxx> wrote:
> Forwarding since not everybody follows bugzilla. Apparently bisected
> to f9e54c3a2f5b ("vfio/pci: implement huge_fault support").
>
> Athul, f9e54c3a2f5b appears to revert cleanly from v6.13-rc1. Can you
> verify that reverting it is enough to avoid these artifacts?
>
> #regzbot introduced: f9e54c3a2f5b ("vfio/pci: implement huge_fault support")
>
> ----- Forwarded message from bugzilla-daemon@xxxxxxxxxx -----
>
> Date: Sat, 21 Dec 2024 10:10:02 +0000
> From: bugzilla-daemon@xxxxxxxxxx
> To: bjorn@xxxxxxxxxxxxxxxxxxxxxxx
> Subject: [Bug 219619] New: vfio-pci: screen graphics artifacts after 6.12 kernel upgrade
> Message-ID: <bug-219619-41252@xxxxxxxxxxxxxxxxxxxxxxxxx/>
>
> https://bugzilla.kernel.org/show_bug.cgi?id=219619
>
> Bug ID: 219619
> Summary: vfio-pci: screen graphics artifacts after 6.12 kernel
> upgrade
> Product: Drivers
> Version: 2.5
> Hardware: AMD
> OS: Linux
> Status: NEW
> Severity: normal
> Priority: P3
> Component: PCI
> Assignee: drivers_pci@xxxxxxxxxxxxxxxxxxxx
> Reporter: athul.krishna.kr@xxxxxxxxxxxxxx
> Regression: No
>
> Created attachment 307382
> --> https://bugzilla.kernel.org/attachment.cgi?id=307382&action=edit
> dmesg
>
> Device: Asus Zephyrus GA402RJ
> CPU: Ryzen 7 6800HS
> GPU: RX 6700S
> Kernel: 6.13.0-rc3-g8faabc041a00
>
> Problem:
> Launching games or gpu bench-marking tools in qemu windows 11 vm will cause
> screen artifacts, ultimately qemu will pause with unrecoverable error.
>
> Commit:
> f9e54c3a2f5b79ecc57c7bc7d0d3521e461a2101 is the first bad commit
> commit f9e54c3a2f5b79ecc57c7bc7d0d3521e461a2101
> Author: Alex Williamson <alex.williamson@xxxxxxxxxx>
> Date: Mon Aug 26 16:43:53 2024 -0400
>
> vfio/pci: implement huge_fault support
>
> With the addition of pfnmap support in vmf_insert_pfn_{pmd,pud}() we can
> take advantage of PMD and PUD faults to PCI BAR mmaps and create more
> efficient mappings. PCI BARs are always a power of two and will typically
> get at least PMD alignment without userspace even trying. Userspace
> alignment for PUD mappings is also not too difficult.
>
> Consolidate faults through a single handler with a new wrapper for
> standard single page faults. The pre-faulting behavior of commit
> d71a989cf5d9 ("vfio/pci: Insert full vma on mmap'd MMIO fault") is removed
> in this refactoring since huge_fault will cover the bulk of the faults and
> results in more efficient page table usage. We also want to avoid that
> pre-faulted single page mappings preempt huge page mappings.
>
> Link: https://lkml.kernel.org/r/20240826204353.2228736-20-peterx@xxxxxxxxxx
> Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
> Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
> Cc: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
> Cc: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
> Cc: Borislav Petkov <bp@xxxxxxxxx>
> Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
> Cc: Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>
> Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
> Cc: David Hildenbrand <david@xxxxxxxxxx>
> Cc: Gavin Shan <gshan@xxxxxxxxxx>
> Cc: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx>
> Cc: Heiko Carstens <hca@xxxxxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: Jason Gunthorpe <jgg@xxxxxxxxxx>
> Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
> Cc: Niklas Schnelle <schnelle@xxxxxxxxxxxxx>
> Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
> Cc: Sean Christopherson <seanjc@xxxxxxxxxx>
> Cc: Sven Schnelle <svens@xxxxxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
> Cc: Will Deacon <will@xxxxxxxxxx>
> Cc: Zi Yan <ziy@xxxxxxxxxx>
> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
>
> drivers/vfio/pci/vfio_pci_core.c | 60 ++++++++++++++++++++++++++++------------
> 1 file changed, 43 insertions(+), 17 deletions(-)
>
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