[PATCH] runqemu: Add workaround for APIC hang on pre 4.15 kernels on qemux86

[PATCH] runqemu: Add workaround for APIC hang on pre 4.15 kernels on qemux86

[Richard Purdie]

On pre 4.15 host kernels, an APIC window emulation bug can cause qemu
to hang. On 64 bit we can use the x2apic, for 32 bit, we just have to
disable the other timer sources and rely on kvm-clock.

[YOCTO #12301]

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
 scripts/runqemu | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/scripts/runqemu b/scripts/runqemu
index f2b4b3c..d998494 100755
--- a/scripts/runqemu
+++ b/scripts/runqemu
@@ -510,6 +510,11 @@ class BaseConfig(object):
 
         if os.access(dev_kvm, os.W_OK|os.R_OK):
             self.qemu_opt_script += ' -enable-kvm'
+            if self.get('MACHINE') == "qemux86":
+                # Workaround for broken APIC window on pre 4.15 host kernels which causes boot hangs
+                # See YOCTO #12301
+                # On 64 bit we use x2apic
+                self.kernel_cmdline_script += " clocksource=kvm-clock hpet=disable noapic nolapic"
         else:
             logger.error("You have no read or write permission on /dev/kvm.")
             logger.error("Please change the ownership of this file as described at:")
-- 
2.7.4

✗ patchtest: failure for runqemu: Add workaround for APIC hang on pre 4.15 kernels on qemux86

[Patchwork]

== Series Details ==

Series: runqemu: Add workaround for APIC hang on pre 4.15 kernels on qemux86
Revision: 1
URL   : https://patchwork.openembedded.org/series/10357/
State : failure

== Summary ==


Thank you for submitting this patch series to OpenEmbedded Core. This is
an automated response. Several tests have been executed on the proposed
series by patchtest resulting in the following failures:



* Issue             Series does not apply on top of target branch [test_series_merge_on_head] 
  Suggested fix    Rebase your series on top of targeted branch
  Targeted branch  master (currently at 82e67b82ea)



If you believe any of these test results are incorrect, please reply to the
mailing list (openembedded-core@lists.openembedded.org) raising your concerns.
Otherwise we would appreciate you correcting the issues and submitting a new
version of the patchset if applicable. Please ensure you add/increment the
version number when sending the new version (i.e. [PATCH] -> [PATCH v2] ->
[PATCH v3] -> ...).

---
Guidelines:     https://www.openembedded.org/wiki/Commit_Patch_Message_Guidelines
Test framework: http://git.yoctoproject.org/cgit/cgit.cgi/patchtest
Test suite:     http://git.yoctoproject.org/cgit/cgit.cgi/patchtest-oe