Re: [libvirt] [PATCH v2 4/7] qemu: get arch name from <cpu> element

The qemu32 CPU model is chosen based on the <os arch=...> name when creating the QEMU command line for a 64-bit host. For the opposite transformation we can test the guest CPU model for the "lm" feature. If it is absent, def->os.arch needs to be corrected. Signed-off-by: Paolo Bonzini <pbonzini(a)redhat.com&gt; --- src/qemu/qemu_command.c | 18 ++++++++++++++++++ 1 files changed, 18 insertions(+), 0 deletions(-) diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index fc337f7..7fe8c48 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -6830,6 +6830,24 @@ qemuParseCommandLineCPU(virDomainDefPtr dom, } } while ((p = next)); + if (STREQ(dom->os.arch, "x86_64")) { + bool is_32bit = false; + union cpuData *cpuData = NULL; + int ret; + + ret = cpuEncode("x86_64", cpu, NULL, &cpuData, + NULL, NULL, NULL, NULL); + if (ret < 0) + goto error; + + is_32bit = (cpuHasFeature("x86_64", cpuData, "lm") != 1); + cpuDataFree("x86_64", cpuData);