Commit 0b4a285e authored by Alexey Makhalov's avatar Alexey Makhalov Committed by Thomas Gleixner
Browse files

x86/vmware: Avoid TSC recalibration when frequency is known 



When the TSC frequency is known because it is retrieved from the
hypervisor, skip TSC refined calibration by setting X86_FEATURE_TSC_KNOWN_FREQ.

Signed-off-by: default avatarAlexey Makhalov <amakhalov@vmware.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210105004752.131069-1-amakhalov@vmware.com
parent 0d02ec6b

arch/x86/kernel/cpu/vmware.c

+2 −0
Original line number Diff line number Diff line
@@ -378,6 +378,8 @@ static void __init vmware_set_capabilities(void) 
{

	setup_force_cpu_cap(X86_FEATURE_CONSTANT_TSC);

	setup_force_cpu_cap(X86_FEATURE_TSC_RELIABLE);

	if (vmware_tsc_khz)

		setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ);

	if (vmware_hypercall_mode == CPUID_VMWARE_FEATURES_ECX_VMCALL)

		setup_force_cpu_cap(X86_FEATURE_VMCALL);

	else if (vmware_hypercall_mode == CPUID_VMWARE_FEATURES_ECX_VMMCALL)