On Mon, 8 Jun 2026 at 14:51, Peter Maydell <[email protected]> wrote:
>
> On Fri, 29 May 2026 at 09:29, Alex Bennée <[email protected]> wrote:
> >
> > This series fully models the behaviour of WFxT instructions. We
> > already had support for WFE for M-profile but we left off A-profile as
> > it has more potential sources of wake-ups. The main one is the event
> > stream which includes events from significant bits of the timer
> > ticking over.
> >
> > The refactoring from the previous iterations of the patch have now
> > been merged.
> >
> > I've dropped trying to fully model the global monitor in favour of
> > taking advantage of the architectural flexibility to have an IMPDEF
> > event wake up for any reason. We treat the setting of exclusive_addr
> > as such a reason because it indicates the current vCPU is in a ldstx
> > exclusive region and we don't want the guest to deadlock. This does mean
> > the system won't sleep on WFE enabled locks but people shouldn't be
> > relying on QEMU to model real world sleep patterns anyway given the
> > efficiency of emulation compared to real HW.
> >
> > I've written a test case using kvm-unit-tests:
> >
> > Message-ID: <[email protected]>
> > Date: Wed, 27 May 2026 12:18:21 +0100
> > Subject: [kvm-unit-tests PATCH v2] arm: add wfx test case
> > From: =?UTF-8?q?Alex=20Benn=C3=A9e?= <[email protected]>
> >
> > All patches are now reviewed.
>
>
>
> Applied to target-arm.next, thanks.
This turns out to cause failures in "make check-functional": some
tests now time out. It looks like the patch that triggers this
is the "enable event stream on WFE instructions".
13/79 func-thorough+func-arm-thorough+thorough -
qemu:func-arm-aspeed_rainier ERROR 36.17s
exit status 1
74/79 func-thorough+func-arm-thorough+thorough -
qemu:func-arm-smdkc210 TIMEOUT 90.01s
killed by signal 15 SIGTERM
75/79 func-thorough+func-arm-thorough+thorough - qemu:func-arm-raspi2
TIMEOUT 120.01s killed by signal 15
SIGTERM
76/79 func-thorough+func-arm-thorough+thorough -
qemu:func-arm-quanta_gsj TIMEOUT 240.01s
killed by signal 15 SIGTERM
77/79 func-thorough+func-arm-thorough+thorough - qemu:func-arm-bpim2u
TIMEOUT 500.01s killed by signal 15
SIGTERM
78/79 func-thorough+func-arm-thorough+thorough -
qemu:func-arm-orangepi TIMEOUT 540.01s
killed by signal 15 SIGTERM
79/79 func-thorough+func-aarch64-thorough+thorough -
qemu:func-aarch64-sbsaref_freebsd TIMEOUT 720.02s
killed by signal 15 SIGTERM
I've kept the first 4 patches, but dropped patches 5-8.
I also noticed a problem with patch 5 which I've commented on.
thanks
-- PMM
