On Thu, Mar 17, 2022 at 1:52 AM Marc Zyngier <maz@xxxxxxxxxx> wrote:
>
> On 2022-03-17 06:44, Oliver Upton wrote:
> > On Wed, Mar 16, 2022 at 09:51:26PM -0700, Ricardo Koller wrote:
> >> Add an arch_timer edge-cases selftest. For now, just add some basic
> >> sanity checks, and some stress conditions (like waiting for the timers
> >> while re-scheduling the vcpu). The next commit will add the actual
> >> edge
> >> case tests.
> >>
> >> This test fails without a867e9d0cc1 "KVM: arm64: Don't miss pending
> >> interrupts for suspended vCPU".
> >>
> >> Reviewed-by: Reiji Watanabe <reijiw@xxxxxxxxxx>
> >> Reviewed-by: Raghavendra Rao Ananta <rananta@xxxxxxxxxx>
> >> Signed-off-by: Ricardo Koller <ricarkol@xxxxxxxxxx>
>
> [...]
>
> >> + asm volatile("wfi\n"
> >> + "msr daifclr, #2\n"
> >> + /* handle IRQ */
> >
> > I believe an isb is owed here (DDI0487G.b D1.13.4). Annoyingly, I am
> > having a hard time finding the same language in the H.a revision of the
> > manual :-/
>
> D1.3.6 probably is what you are looking for.
>
> "Context synchronization event" is the key phrase to remember
> when grepping through the ARM ARM. And yes, the new layout is
> a nightmare (as if we really needed an additional 2800 pages...).
Thanks! I have yet to find a PDF viewer that can chew through such a
document for a search term at a decent clip. And all the extra pages
just made the problem even worse.
--
Thanks,
Oliver
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