On Wed, Nov 08, 2023 at 10:29:51AM -0800, Xin Li wrote:
Add kvm_is_fred_enabled() to get if FRED is enabled on a vCPU.
Tested-by: Shan Kang shan.kang@intel.com Signed-off-by: Xin Li xin3.li@intel.com
arch/x86/kvm/kvm_cache_regs.h | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/arch/x86/kvm/kvm_cache_regs.h b/arch/x86/kvm/kvm_cache_regs.h index 75eae9c4998a..390643e8c532 100644 --- a/arch/x86/kvm/kvm_cache_regs.h +++ b/arch/x86/kvm/kvm_cache_regs.h @@ -187,6 +187,16 @@ static __always_inline bool kvm_is_cr4_bit_set(struct kvm_vcpu *vcpu, return !!kvm_read_cr4_bits(vcpu, cr4_bit); }
+static __always_inline bool kvm_is_fred_enabled(struct kvm_vcpu *vcpu) +{ +#ifdef CONFIG_X86_64
- return cpu_feature_enabled(X86_FEATURE_FRED) &&
kvm_is_cr4_bit_set(vcpu, X86_CR4_FRED);
FRED is enabled when CR4.FRED = IA32_EFER.LMA = 1. Any reason to omit the check about long mode?
+#else
- return false;
+#endif +}
static inline ulong kvm_read_cr3(struct kvm_vcpu *vcpu) { if (!kvm_register_is_available(vcpu, VCPU_EXREG_CR3)) -- 2.42.0