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kvm: vmx: hook preemption timer support

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Hook the VMX preemption timer to the "hv timer" functionality added
by the previous patch.  This includes: checking if the feature is
supported, if the feature is broken on the CPU, the hooks to
setup/clean the VMX preemption timer, arming the timer on vmentry
and handling the vmexit.

A module parameter states if the VMX preemption timer should be
utilized.

Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
[Move hv_deadline_tsc to struct vcpu_vmx, use -1 as the "unset" value.
 Put all VMX bits here.  Enable it by default #yolo. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Yunhong Jiang
2016-06-13 14:19:59 -07:00
committed by Paolo Bonzini
parent bc22512bb2
commit 64672c95ea
3 changed files with 183 additions and 2 deletions
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2
arch/x86/include/asm/kvm_host.h
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@@ -1079,6 +1079,8 @@ extern u32 kvm_max_guest_tsc_khz;
extern u8 kvm_tsc_scaling_ratio_frac_bits;
/* maximum allowed value of TSC scaling ratio */
extern u64 kvm_max_tsc_scaling_ratio;
/* 1ull << kvm_tsc_scaling_ratio_frac_bits */
extern u64 kvm_default_tsc_scaling_ratio;
enum emulation_result {
EMULATE_DONE, /* no further processing */