KVM: VMX: Open code VMX preemption timer rate mask in its accessor

Use vmx_misc_preemption_timer_rate() to get the rate in hardware_setup(),
and open code the rate's bitmask in vmx_misc_preemption_timer_rate() so
that the function looks like all the helpers that grab values from
VMX_BASIC and VMX_MISC MSR values.

No functional change intended.

Cc: Shan Kang <shan.kang@intel.com>
Cc: Kai Huang <kai.huang@intel.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
[sean: split to separate patch, write changelog]
Reviewed-by: Kai Huang <kai.huang@intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://lore.kernel.org/r/20240605231918.2915961-10-seanjc@google.comSigned-off-by: Sean Christopherson <seanjc@google.com>

arch/x86/include/asm/vmx.h

@@ -153,7 +153,6 @@ static inline u64 vmx_basic_encode_vmcs_info(u32 revision, u16 size, u8 memtype)
 	return revision | ((u64)size << 32) | ((u64)memtype << 50);
 }
 
-#define VMX_MISC_PREEMPTION_TIMER_RATE_MASK	GENMASK_ULL(4, 0)
 #define VMX_MISC_SAVE_EFER_LMA			BIT_ULL(5)
 #define VMX_MISC_ACTIVITY_HLT			BIT_ULL(6)
 #define VMX_MISC_ACTIVITY_SHUTDOWN		BIT_ULL(7)
@@ -167,7 +166,7 @@ static inline u64 vmx_basic_encode_vmcs_info(u32 revision, u16 size, u8 memtype)
 
 static inline int vmx_misc_preemption_timer_rate(u64 vmx_misc)
 {
-	return vmx_misc & VMX_MISC_PREEMPTION_TIMER_RATE_MASK;
+	return vmx_misc & GENMASK_ULL(4, 0);
 }
 
 static inline int vmx_misc_cr3_count(u64 vmx_misc)

arch/x86/kvm/vmx/vmx.c

@@ -8517,7 +8517,7 @@ __init int vmx_hardware_setup(void)
 		u64 use_timer_freq = 5000ULL * 1000 * 1000;
 
 		cpu_preemption_timer_multi =
-			vmcs_config.misc & VMX_MISC_PREEMPTION_TIMER_RATE_MASK;
+			vmx_misc_preemption_timer_rate(vmcs_config.misc);
 
 		if (tsc_khz)
 			use_timer_freq = (u64)tsc_khz * 1000;