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target/i386: kvm: add support for TSC scaling

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Linux 5.14 will add support for nested TSC scaling.  Add the
corresponding feature in QEMU; to keep support for existing kernels,
do not add it to any processor yet.

The handling of the VMCS enumeration MSR is ugly; once we have more than
one case, we may want to add a table to check VMX features against.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2021-06-21 18:31:52 +02:00
parent ecba223da6
commit 9ce8af4d92
3 changed files with 10 additions and 5 deletions
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12
target/i386/kvm/kvm.c
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@ -2700,8 +2700,6 @@ static uint64_t make_vmx_msr_value(uint32_t index, uint32_t features)
return must_be_one | (((uint64_t)can_be_one) << 32);
}
#define VMCS12_MAX_FIELD_INDEX (0x17)
static void kvm_msr_entry_add_vmx(X86CPU *cpu, FeatureWordArray f)
{
uint64_t kvm_vmx_basic =
@ -2791,8 +2789,14 @@ static void kvm_msr_entry_add_vmx(X86CPU *cpu, FeatureWordArray f)
CR0_PE_MASK | CR0_PG_MASK | CR0_NE_MASK);
kvm_msr_entry_add(cpu, MSR_IA32_VMX_CR4_FIXED0,
CR4_VMXE_MASK);
kvm_msr_entry_add(cpu, MSR_IA32_VMX_VMCS_ENUM,
VMCS12_MAX_FIELD_INDEX << 1);
if (f[FEAT_VMX_SECONDARY_CTLS] & VMX_SECONDARY_EXEC_TSC_SCALING) {
/* TSC multiplier (0x2032). */
kvm_msr_entry_add(cpu, MSR_IA32_VMX_VMCS_ENUM, 0x32);
} else {
/* Preemption timer (0x482E). */
kvm_msr_entry_add(cpu, MSR_IA32_VMX_VMCS_ENUM, 0x2E);
}
}
static void kvm_msr_entry_add_perf(X86CPU *cpu, FeatureWordArray f)