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i386: Don't automatically enable FEAT_KVM_HINTS bits 

Bug fix for "-cpu host" with newer kernels.
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Merge remote-tracking branch 'remotes/ehabkost/tags/x86-next-pull-request' into staging

i386: Don't automatically enable FEAT_KVM_HINTS bits

Bug fix for "-cpu host" with newer kernels.

# gpg: Signature made Mon 16 Apr 2018 17:37:53 BST
# gpg:                using RSA key 2807936F984DC5A6
# gpg: Good signature from "Eduardo Habkost <ehabkost@redhat.com>"
# Primary key fingerprint: 5A32 2FD5 ABC4 D3DB ACCF  D1AA 2807 936F 984D C5A6

* remotes/ehabkost/tags/x86-next-pull-request:
  i386: Don't automatically enable FEAT_KVM_HINTS bits

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2018-04-17 11:13:47 +01:00
parent 32f418c003 0d914f39a7
commit 0df2121693
1 changed files with 9 additions and 1 deletions
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10
target/i386/cpu.c
View File

@ -295,6 +295,8 @@ typedef struct FeatureWordInfo {
uint32_t tcg_features; /* Feature flags supported by TCG */
uint32_t unmigratable_flags; /* Feature flags known to be unmigratable */
uint32_t migratable_flags; /* Feature flags known to be migratable */
/* Features that shouldn't be auto-enabled by "-cpu host" */
uint32_t no_autoenable_flags;
} FeatureWordInfo;
static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
@ -400,6 +402,11 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
},
.cpuid_eax = KVM_CPUID_FEATURES, .cpuid_reg = R_EDX,
.tcg_features = TCG_KVM_FEATURES,
/*
* KVM hints aren't auto-enabled by -cpu host, they need to be
* explicitly enabled in the command-line.
*/
.no_autoenable_flags = ~0U,
},
[FEAT_HYPERV_EAX] = {
.feat_names = {
@ -4062,7 +4069,8 @@ static void x86_cpu_expand_features(X86CPU *cpu, Error **errp)
*/
env->features[w] |=
x86_cpu_get_supported_feature_word(w, cpu->migratable) &
~env->user_features[w];
~env->user_features[w] & \
~feature_word_info[w].no_autoenable_flags;
}
}