[libvirt PATCH v5 06/20] fixup! qemu: Fix / improve virQEMUCapsProbeHVF()

Fix the architecture check so that hardware acceleration is only ever advertised when the guest and host architecture match; exit early if possible instead of calling sysctl every single time; add some comments. Signed-off-by: Andrea Bolognani <abologna(a)redhat.com&gt; Tested-by: Brad Laue <brad(a)brad-x.com&gt; --- src/qemu/qemu_capabilities.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-) diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c index 9a0525222e..79e9b19236 100644 --- a/src/qemu/qemu_capabilities.c +++ b/src/qemu/qemu_capabilities.c @@ -3202,17 +3202,27 @@ virQEMUCapsProbeQMPKVMState(virQEMUCaps *qemuCaps, static int virQEMUCapsProbeHVF(virQEMUCaps *qemuCaps) { - int hv_support; + int hv_support = 0; size_t len = sizeof(hv_support); + virArch hostArch = virArchFromHost(); + /* Guest and host arch need to match for hardware acceleration + * to be usable */ + if (qemuCaps->arch != hostArch) + return 0; + + /* We don't have a nice way to probe whether the QEMU binary + * contains HVF support, but we know that versions older than + * QEMU 2.12 didn't have the feature at all */ + if (qemuCaps->version < 2012000) + return 0; + + /* We need the OS to report Hypervisor.framework availability */ if (sysctlbyname("kern.hv_support", &hv_support, &len, NULL, 0) < 0) - hv_support = 0; + return 0; - if (qemuCaps->version >= 2012000 && - ARCH_IS_X86(qemuCaps->arch) && - hv_support) { + if (hv_support) virQEMUCapsSet(qemuCaps, QEMU_CAPS_HVF); - } return 0; } -- 2.31.1