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kernel/idt: Ensure #HV handler RIP checks are executed when interrupts are enabled #491

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kernel/idt: Ensure #HV handler RIP checks are executed when interrupts are enabled #491

wants to merge 1 commit into from

Commits on Oct 22, 2024

  1. kernel/idt: Ensure #HV handler RIP checks work when interrupts are en… 

    …abled

The #HV handler currently checks EFLAGS.IF=1 at the start of the handler
and immediately processes the #HV events if enabled without performing
checks to see if RIP is within the VMPL switch or the iret window. The
RIP windows are only checked if EFLAGS.IF=0.

This means that if interrupts are enabled during either of these windows
and a #HV occurs then the behaviour is undefined.

The code has been reorganised in this patch to examine EFLAGS.IF only
after both RIP windows have been checked.

Signed-off-by: Roy Hopkins <[email protected]>
    @roy-hopkins
    roy-hopkins committed Oct 22, 2024
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