On 5/1/2023 9:02 AM, Tom Lendacky wrote:
From: Ashish Kalra <ashish.kalra@xxxxxxx>
Add checks in interrupt exit code paths in case of returns
to user mode to check if currently executing the #HV handler
then don't follow the irqentry_exit_to_user_mode path as
that can potentially cause the #HV handler to be
preempted and rescheduled on another CPU. Rescheduled #HV
handler on another cpu will cause interrupts to be handled
on a different cpu than the injected one, causing
invalid EOIs and missed/lost guest interrupts and
corresponding hangs and/or per-cpu IRQs handled on
non-intended cpu.
Signed-off-by: Ashish Kalra <ashish.kalra@xxxxxxx>
This should be merged into one of the appropriate #HV patches and just
add Ashish with a Co-developed-by: tag where appropriate. This would be
appropriate as a separate only if discovered after the series was merged.
Sure. Will update in the next version.
