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backport fix for AMX register breakage

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vmexit's can cause the AMX registers to "misbehave" which can break
ZFS, even though ZFS doesn't use AMX at all.

This causes crashes and processes hanging forever in uninterruptible
sleep (the infamous D state) on Intel Xeon 4th gen HW, possible other
HW too, but we only got reports on Sapphire Rapids models.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
Tested-by: Aaron Lauterer <a.lauterer@proxmox.com>
(cherry picked from commit 9e8946d4b9)
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
This commit is contained in:
Thomas Lamprecht
2023-10-10 14:55:48 +02:00
parent 7c44e0fd4f
commit 453933b504
2 changed files with 88 additions and 0 deletions
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debian/patches/series
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@@ -8,3 +8,4 @@
0008-Patch-move-manpage-arcstat-1-to-arcstat-8.patch
0009-arcstat-Fix-integer-division-with-python3.patch
0010-arc-stat-summary-guard-access-to-l2arc-MFU-MRU-stats.patch
0011-Avoid-save-restoring-AMX-registers-to-avoid-a-SPR-er.patch