gwj / at91sam9263 · Commits

Commit e8a6aec9b5e062ca8d14ae0e14efda17ae9685d8

Authored by Avi Kivity
Committed by Anthony Liguori
1 parent 02b049df

kvm: Trim cpu features not supported by kvm 

Remove cpu features that are not supported by kvm from the cpuid features
reported to the guest.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Inline Side-by-side
Showing 1 changed file with 30 additions and 0 deletions
target-i386/helper.c
  View file @e8a6aec
... ... @@ -93,6 +93,21 @@ static void add_flagname_to_bitmaps(char *flagname, uint32_t *features,
93 93 }
94 94 }
95 95  
  96 +static void kvm_trim_features(uint32_t *features, uint32_t supported,
  97 + const char *names[])
  98 +{
  99 + int i;
  100 + uint32_t mask;
  101 +
  102 + for (i = 0; i < 32; ++i) {
  103 + mask = 1U << i;
  104 + if ((*features & mask) && !(supported & mask)) {
  105 + printf("Processor feature %s not supported by kvm\n", names[i]);
  106 + *features &= ~mask;
  107 + }
  108 + }
  109 +}
  110 +
96 111 typedef struct x86_def_t {
97 112 const char *name;
98 113 uint32_t level;
... ... @@ -1699,5 +1714,20 @@ CPUX86State *cpu_x86_init(const char *cpu_model)
1699 1714  
1700 1715 qemu_init_vcpu(env);
1701 1716  
  1717 + if (kvm_enabled()) {
  1718 + kvm_trim_features(&env->cpuid_features,
  1719 + kvm_arch_get_supported_cpuid(env, 1, R_EDX),
  1720 + feature_name);
  1721 + kvm_trim_features(&env->cpuid_ext_features,
  1722 + kvm_arch_get_supported_cpuid(env, 1, R_ECX),
  1723 + ext_feature_name);
  1724 + kvm_trim_features(&env->cpuid_ext2_features,
  1725 + kvm_arch_get_supported_cpuid(env, 0x80000001, R_EDX),
  1726 + ext2_feature_name);
  1727 + kvm_trim_features(&env->cpuid_ext3_features,
  1728 + kvm_arch_get_supported_cpuid(env, 0x80000001, R_ECX),
  1729 + ext3_feature_name);
  1730 + }
  1731 +
1702 1732 return env;
1703 1733 }
... ...