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Re: [libvirt] [PATCH 1/5] S390: Override QEMU_CAPS_NO_ACPI for s390x

On 06/22/2012 11:59 AM, Daniel P. Berrange wrote:
On Fri, Jun 22, 2012 at 09:50:25AM +0200, Michal Privoznik wrote:
On 21.06.2012 18:15, Viktor Mihajlovski wrote:

Starting a KVM guest on s390 fails immediately. This is because
"qemu --help" reports -no-acpi even for the s390(x) architecture but
-no-acpi isn't supported there.
Workaround is to remove QEMU_CAPS_NO_ACPI from the capability set
after the version/capability extraction.

Signed-off-by: Viktor Mihajlovski<mihajlov linux vnet ibm com>
  src/qemu/qemu_capabilities.c |    5 +++++
  1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 4308833..0c01cb0 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -1511,6 +1511,11 @@ int qemuCapsExtractVersionInfo(const char *qemu, const char *arch,
          qemuCapsSet(flags, QEMU_CAPS_PCI_MULTIBUS);

+    /* S390 and probably other archs do not support no-acpi -
+       maybe the qemu option parsing should be re-thought. */
+    if (STREQLEN(arch, "s390x", 5))
+        qemuCapsClear(flags, QEMU_CAPS_NO_ACPI);
      /* qemuCapsExtractDeviceStr will only set additional flags if qemu
       * understands the 0.13.0+ notion of "-device driver,".  */
      if (qemuCapsGet(flags, QEMU_CAPS_DEVICE)&&

I don't think this is the right approach. I mean, if qemu's broken
shouldn't it be fixed?

In principal I agree with you, but this aspect of QEMU is not likely
to be changed in the forseeable future, not least because QEMU don't
like us using -help in the first place.

So, ACK to this patch on that basis


actually, the newest upstream version has removed the -no-acpi option for non-x86 archs. Still it is probably prudent to keep this workaround to support older qemu versions. Thanks.


Mit freundlichen Grüßen/Kind Regards
   Viktor Mihajlovski

IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Martin Jetter
Geschäftsführung: Dirk Wittkopp
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