From 9997cf7bdac056aeed246613639675c5a9f8fdc2 Mon Sep 17 00:00:00 2001 From: Eduardo Habkost Date: Fri, 15 Apr 2016 14:54:26 -0300 Subject: target-i386: Set AMD alias bits after filtering CPUID data MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit QEMU complains about -cpu host on an AMD machine: warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 0] For bits 0,1,3,4,5,6,7,8,9,12,13,14,15,16,17,23,24. KVM_GET_SUPPORTED_CPUID and and x86_cpu_get_migratable_flags() don't handle the AMD CPUID aliases bits, making x86_cpu_filter_features() print warnings and clear those CPUID bits incorrectly. To avoid hacking x86_cpu_get_migratable_flags() to handle CPUID_EXT2_AMD_ALIASES (just like the existing hack inside kvm_arch_get_supported_cpuid()), simply move the CPUID_EXT2_AMD_ALIASES code in x86_cpu_realizefn() after the x86_cpu_filter_features() call. This will probably make the CPUID_EXT2_AMD_ALIASES hack in kvm_arch_get_supported_cpuid() unnecessary, too. The hack will be removed in a follow-up patch after v2.6.0. Reported-by: Radim Krčmář Tested-by: Radim Krčmář Signed-off-by: Eduardo Habkost --- target-i386/cpu.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/target-i386/cpu.c b/target-i386/cpu.c index ddae932ee1..d0b5b69156 100644 --- a/target-i386/cpu.c +++ b/target-i386/cpu.c @@ -2897,6 +2897,14 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp) env->cpuid_level = 7; } + if (x86_cpu_filter_features(cpu) && cpu->enforce_cpuid) { + error_setg(&local_err, + kvm_enabled() ? + "Host doesn't support requested features" : + "TCG doesn't support requested features"); + goto out; + } + /* On AMD CPUs, some CPUID[8000_0001].EDX bits must match the bits on * CPUID[1].EDX. */ @@ -2907,14 +2915,6 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp) } - if (x86_cpu_filter_features(cpu) && cpu->enforce_cpuid) { - error_setg(&local_err, - kvm_enabled() ? - "Host doesn't support requested features" : - "TCG doesn't support requested features"); - goto out; - } - #ifndef CONFIG_USER_ONLY qemu_register_reset(x86_cpu_machine_reset_cb, cpu); -- cgit v1.2.3