gwj / at91sam9263 · Commits

Commit 6c1f42fe83bf9bc14a7a6cc5afd8dad83ee25c74

Authored by Andre Przywara
Committed by Anthony Liguori
1 parent f441bee8

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>
Inline Side-by-side
Showing 2 changed files with 22 additions and 29 deletions
target-i386/helper.c
  View file @6c1f42f
... ... @@ -92,20 +92,6 @@ static void add_flagname_to_bitmaps(const char *flagname, uint32_t *features,
92 92 }
93 93 }
94 94  
95   -static void kvm_trim_features(uint32_t *features, uint32_t supported,
96   - const char *names[])
97   -{
98   - int i;
99   - uint32_t mask;
100   -
101   - for (i = 0; i < 32; ++i) {
102   - mask = 1U << i;
103   - if ((*features & mask) && !(supported & mask)) {
104   - *features &= ~mask;
105   - }
106   - }
107   -}
108   -
109 95 typedef struct x86_def_t {
110 96 const char *name;
111 97 uint32_t level;
... ... @@ -1773,21 +1759,6 @@ CPUX86State *cpu_x86_init(const char *cpu_model)
1773 1759  
1774 1760 qemu_init_vcpu(env);
1775 1761  
1776   - if (kvm_enabled()) {
1777   - kvm_trim_features(&env->cpuid_features,
1778   - kvm_arch_get_supported_cpuid(env, 1, R_EDX),
1779   - feature_name);
1780   - kvm_trim_features(&env->cpuid_ext_features,
1781   - kvm_arch_get_supported_cpuid(env, 1, R_ECX),
1782   - ext_feature_name);
1783   - kvm_trim_features(&env->cpuid_ext2_features,
1784   - kvm_arch_get_supported_cpuid(env, 0x80000001, R_EDX),
1785   - ext2_feature_name);
1786   - kvm_trim_features(&env->cpuid_ext3_features,
1787   - kvm_arch_get_supported_cpuid(env, 0x80000001, R_ECX),
1788   - ext3_feature_name);
1789   - }
1790   -
1791 1762 return env;
1792 1763 }
1793 1764  
... ...
target-i386/kvm.c
  View file @6c1f42f
... ... @@ -117,6 +117,19 @@ uint32_t kvm_arch_get_supported_cpuid(CPUState *env, uint32_t function, int reg)
117 117  
118 118 #endif
119 119  
  120 +static void kvm_trim_features(uint32_t *features, uint32_t supported)
  121 +{
  122 + int i;
  123 + uint32_t mask;
  124 +
  125 + for (i = 0; i < 32; ++i) {
  126 + mask = 1U << i;
  127 + if ((*features & mask) && !(supported & mask)) {
  128 + *features &= ~mask;
  129 + }
  130 + }
  131 +}
  132 +
120 133 int kvm_arch_init_vcpu(CPUState *env)
121 134 {
122 135 struct {
... ... @@ -128,6 +141,15 @@ int kvm_arch_init_vcpu(CPUState *env)
128 141  
129 142 env->mp_state = KVM_MP_STATE_RUNNABLE;
130 143  
  144 + kvm_trim_features(&env->cpuid_features,
  145 + kvm_arch_get_supported_cpuid(env, 1, R_EDX));
  146 + kvm_trim_features(&env->cpuid_ext_features,
  147 + kvm_arch_get_supported_cpuid(env, 1, R_ECX));
  148 + kvm_trim_features(&env->cpuid_ext2_features,
  149 + kvm_arch_get_supported_cpuid(env, 0x80000001, R_EDX));
  150 + kvm_trim_features(&env->cpuid_ext3_features,
  151 + kvm_arch_get_supported_cpuid(env, 0x80000001, R_ECX));
  152 +
131 153 cpuid_i = 0;
132 154  
133 155 cpu_x86_cpuid(env, 0, 0, &limit, &unused, &unused, &unused);
... ...