Public bug reported:
This patch is needed in linux-nvidia-6.17 to avoid a soft lockup when
mapping EGM memory for a GPU passthrough VM.
---
When initializing EGM (Extended GPU Memory) regions, the current
implementation performs a single memset operation over the entire memory
region. For very large regions, this can result in long-running
uninterruptible operations that may cause system responsiveness issues
or trigger watchdog timeouts.
Split the memset operation into 1GB chunks.
Error log:
[ 457.465816] watchdog: BUG: soft lockup - CPU#11 stuck for 27s!
[qemu-system-aar:11324]
** Affects: linux-nvidia (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2142160
Title:
Backport NVIDIA: SAUCE: vfio/nvgrace-egm: split zapping EGM into 1GB
chunks
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