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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