diff options
author | Paolo Bonzini <pbonzini@redhat.com> | 2021-06-21 18:31:52 +0200 |
---|---|---|
committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-06-25 10:53:46 +0200 |
commit | 9ce8af4d92d4772cb33d4ea9cbd5ebdb970c5172 (patch) | |
tree | 3696e62d9bcb81b9d12320b1c989f08e26c1202d /target/i386/kvm | |
parent | ecba223da6215d6f6ce2d343b70b2e9a19bfb90b (diff) |
target/i386: kvm: add support for TSC scaling
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>
Diffstat (limited to 'target/i386/kvm')
-rw-r--r-- | target/i386/kvm/kvm.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index ad950c3c27..04e4ec063f 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -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) |