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target/i386: Add kvm_get_one_msr helper 

When try to get one msr from KVM, I found there's no such kind of
existing interface while kvm_put_one_msr() is there. So here comes
the patch. It'll remove redundant preparation code before finally
call KVM_GET_MSRS IOCTL.

No functional change intended.

Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
Message-Id: <20220215195258.29149-4-weijiang.yang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Yang Weijiang 2022-02-15 14:52:53 -05:00 committed by Paolo Bonzini
parent f06d8a18ab
commit 5a778a5f82
1 changed files with 26 additions and 20 deletions
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46
target/i386/kvm/kvm.c
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@ -141,6 +141,7 @@ static struct kvm_msr_list *kvm_feature_msrs;
#define BUS_LOCK_SLICE_TIME 1000000000ULL /* ns */
static RateLimit bus_lock_ratelimit_ctrl;
static int kvm_get_one_msr(X86CPU *cpu, int index, uint64_t *value);
int kvm_has_pit_state2(void)
{
@ -211,28 +212,21 @@ static int kvm_get_tsc(CPUState *cs)
{
X86CPU *cpu = X86_CPU(cs);
CPUX86State *env = &cpu->env;
struct {
struct kvm_msrs info;
struct kvm_msr_entry entries[1];
} msr_data = {};
uint64_t value;
int ret;
if (env->tsc_valid) {
return 0;
}
memset(&msr_data, 0, sizeof(msr_data));
msr_data.info.nmsrs = 1;
msr_data.entries[0].index = MSR_IA32_TSC;
env->tsc_valid = !runstate_is_running();
ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_MSRS, &msr_data);
ret = kvm_get_one_msr(cpu, MSR_IA32_TSC, &value);
if (ret < 0) {
return ret;
}
assert(ret == 1);
env->tsc = msr_data.entries[0].data;
env->tsc = value;
return 0;
}
@ -1566,21 +1560,14 @@ static int hyperv_init_vcpu(X86CPU *cpu)
* the kernel doesn't support setting vp_index; assert that its value
* is in sync
*/
struct {
struct kvm_msrs info;
struct kvm_msr_entry entries[1];
} msr_data = {
.info.nmsrs = 1,
.entries[0].index = HV_X64_MSR_VP_INDEX,
};
uint64_t value;
ret = kvm_vcpu_ioctl(cs, KVM_GET_MSRS, &msr_data);
ret = kvm_get_one_msr(cpu, HV_X64_MSR_VP_INDEX, &value);
if (ret < 0) {
return ret;
}
assert(ret == 1);
if (msr_data.entries[0].data != hyperv_vp_index(CPU(cpu))) {
if (value != hyperv_vp_index(CPU(cpu))) {
error_report("kernel's vp_index != QEMU's vp_index");
return -ENXIO;
}
@ -2839,6 +2826,25 @@ static int kvm_put_one_msr(X86CPU *cpu, int index, uint64_t value)
return kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MSRS, cpu->kvm_msr_buf);
}
static int kvm_get_one_msr(X86CPU *cpu, int index, uint64_t *value)
{
int ret;
struct {
struct kvm_msrs info;
struct kvm_msr_entry entries[1];
} msr_data = {
.info.nmsrs = 1,
.entries[0].index = index,
};
ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_MSRS, &msr_data);
if (ret < 0) {
return ret;
}
assert(ret == 1);
*value = msr_data.entries[0].data;
return ret;
}
void kvm_put_apicbase(X86CPU *cpu, uint64_t value)
{
int ret;