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fix KVMs GET_SUPPORTED_CPUID feature usage 

If we want to trim the user provided CPUID bits for KVM to be not greater
than that of the host, we should not remove the bits _after_ we sent
them to the kernel.
This fixes the masking of features that are not present on the host by
moving the trim function and it's call from helper.c to kvm.c.
It helps to use -cpu host.

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Andre Przywara 2009-06-25 00:08:02 +02:00 committed by Anthony Liguori
parent f441bee871
commit 6c1f42fe83
2 changed files with 22 additions and 29 deletions
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29
target-i386/helper.c
View File

@ -92,20 +92,6 @@ static void add_flagname_to_bitmaps(const char *flagname, uint32_t *features,
}
}
static void kvm_trim_features(uint32_t *features, uint32_t supported,
const char *names[])
{
int i;
uint32_t mask;
for (i = 0; i < 32; ++i) {
mask = 1U << i;
if ((*features & mask) && !(supported & mask)) {
*features &= ~mask;
}
}
}
typedef struct x86_def_t {
const char *name;
uint32_t level;
@ -1773,21 +1759,6 @@ CPUX86State *cpu_x86_init(const char *cpu_model)
qemu_init_vcpu(env);
if (kvm_enabled()) {
kvm_trim_features(&env->cpuid_features,
kvm_arch_get_supported_cpuid(env, 1, R_EDX),
feature_name);
kvm_trim_features(&env->cpuid_ext_features,
kvm_arch_get_supported_cpuid(env, 1, R_ECX),
ext_feature_name);
kvm_trim_features(&env->cpuid_ext2_features,
kvm_arch_get_supported_cpuid(env, 0x80000001, R_EDX),
ext2_feature_name);
kvm_trim_features(&env->cpuid_ext3_features,
kvm_arch_get_supported_cpuid(env, 0x80000001, R_ECX),
ext3_feature_name);
}
return env;
}

22
target-i386/kvm.c
View File

@ -117,6 +117,19 @@ uint32_t kvm_arch_get_supported_cpuid(CPUState *env, uint32_t function, int reg)
#endif
static void kvm_trim_features(uint32_t *features, uint32_t supported)
{
int i;
uint32_t mask;
for (i = 0; i < 32; ++i) {
mask = 1U << i;
if ((*features & mask) && !(supported & mask)) {
*features &= ~mask;
}
}
}
int kvm_arch_init_vcpu(CPUState *env)
{
struct {
@ -128,6 +141,15 @@ int kvm_arch_init_vcpu(CPUState *env)
env->mp_state = KVM_MP_STATE_RUNNABLE;
kvm_trim_features(&env->cpuid_features,
kvm_arch_get_supported_cpuid(env, 1, R_EDX));
kvm_trim_features(&env->cpuid_ext_features,
kvm_arch_get_supported_cpuid(env, 1, R_ECX));
kvm_trim_features(&env->cpuid_ext2_features,
kvm_arch_get_supported_cpuid(env, 0x80000001, R_EDX));
kvm_trim_features(&env->cpuid_ext3_features,
kvm_arch_get_supported_cpuid(env, 0x80000001, R_ECX));
cpuid_i = 0;
cpu_x86_cpuid(env, 0, 0, &limit, &unused, &unused, &unused);