Re: [PATCH V2 3/3] qemu: Use command line to properly check for spice support

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On 10/13/22 09:46, Michal Prívozník wrote:
On 10/13/22 01:24, Jim Fehlig wrote:
domcapabilities reports spice graphics support even against a minimal
qemu installation without spice modules. Checking for 'query-spice'
in the list of qmp commands supported by qemu is not sufficient to
determine spice support. Checking the command line produces acurrate
results.

Signed-off-by: Jim Fehlig <jfehlig@xxxxxxxx>
---
  src/qemu/qemu_capabilities.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 98849daf4c..e40b5c6c00 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -1205,7 +1205,6 @@ struct virQEMUCapsStringFlags {
struct virQEMUCapsStringFlags virQEMUCapsCommands[] = {
-    { "query-spice", QEMU_CAPS_SPICE },
      { "query-vnc", QEMU_CAPS_VNC },
      { "rtc-reset-reinjection", QEMU_CAPS_RTC_RESET_REINJECTION },
      { "query-hotpluggable-cpus", QEMU_CAPS_QUERY_HOTPLUGGABLE_CPUS },
@@ -3265,6 +3264,7 @@ struct virQEMUCapsCommandLineProps {
  static struct virQEMUCapsCommandLineProps virQEMUCapsCommandLine[] = {
      { "fsdev", "multidevs", QEMU_CAPS_FSDEV_MULTIDEVS },
      { "sandbox", NULL, QEMU_CAPS_SECCOMP_SANDBOX },
+    { "spice", NULL, QEMU_CAPS_SPICE },
      { "spice", "gl", QEMU_CAPS_SPICE_GL },
      { "spice", "rendernode", QEMU_CAPS_SPICE_RENDERNODE },
      { "vnc", "power-control", QEMU_CAPS_VNC_POWER_CONTROL },


How is the qemu compiled? Because I tried --disable-spice and libvirt
correctly did NOT set this capability. Then I tried
--disable-spice-protocol and either with or without your patch the
capability was set. I'm using current git master though, so could this
be why I don't see any difference?

It's compiled with spice enabled, but then the corresponding modules not "installed". E.g. no /usr/lib64/qemu/*spice*.so.

Regards,
Jim





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