mirror of https://github.com/acidanthera/audk.git
239b50a863
RestoreTPL called while at TPL_HIGH_LEVEL unconditionally enables interrupts even if called in interrupt handler. That opens a window while interrupt is not completely handled but another interrupt could be accepted. If a VM starts on a heavily loaded host hundreds of periodic timer interrupts might be queued while vCPU is descheduled (the behavior is typical for a Xen host). The next time vCPU is scheduled again all of them get delivered back to back causing OVMF to accept each one without finishing a previous one and cleaning up the stack. That quickly results in stack overflow and a triple fault. Fix it by postponing sending EOI until we finished processing the current tick giving interrupt handler opportunity to clean up the stack before accepting the next tick. Signed-off-by: Igor Druzhinin <igor.druzhinin@citrix.com> Message-Id: <1592275782-9369-1-git-send-email-igor.druzhinin@citrix.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2815 Acked-by: Laszlo Ersek <lersek@redhat.com> [lersek@redhat.com: add BZ ref; rewrap msg to silence PatchCheck.py] |
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| .. | ||
| 8254Timer.inf | ||
| Timer.c | ||
| Timer.h | ||
| Timer.uni | ||
| TimerExtra.uni | ||