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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2019-11-26 09:43:34 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-11-26 09:43:34 -0800 |
| commit | 64d6a12094f35d644540c15440874723b1887f9d (patch) | |
| tree | 84a3517ad84f18504abf72f4280885d15ceb32c9 /arch/x86/kernel/cpu | |
| parent | cd4771f7709211082cbc41dc1f5b2be774ef1604 (diff) | |
| parent | 4df4cb9e99f83b70d54bc0e25081ac23cceafcbc (diff) | |
| download | linux-64d6a12094f35d644540c15440874723b1887f9d.tar.bz2 | |
Merge branch 'x86-hyperv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 hyperv updates from Ingo Molnar:
"Misc updates to the hyperv guest code:
- Rework clockevents initialization to better support hibernation
- Allow guests to enable InvariantTSC
- Micro-optimize send_ipi_one"
* 'x86-hyperv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/hyperv: Initialize clockevents earlier in CPU onlining
x86/hyperv: Allow guests to enable InvariantTSC
x86/hyperv: Micro-optimize send_ipi_one()
Diffstat (limited to 'arch/x86/kernel/cpu')
| -rw-r--r-- | arch/x86/kernel/cpu/mshyperv.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index c656d92cd708..caa032ce3fe3 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -290,7 +290,12 @@ static void __init ms_hyperv_init_platform(void) machine_ops.shutdown = hv_machine_shutdown; machine_ops.crash_shutdown = hv_machine_crash_shutdown; #endif - mark_tsc_unstable("running on Hyper-V"); + if (ms_hyperv.features & HV_X64_ACCESS_TSC_INVARIANT) { + wrmsrl(HV_X64_MSR_TSC_INVARIANT_CONTROL, 0x1); + setup_force_cpu_cap(X86_FEATURE_TSC_RELIABLE); + } else { + mark_tsc_unstable("running on Hyper-V"); + } /* * Generation 2 instances don't support reading the NMI status from |