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| author |   Jiang, Yunhong <yunhong.jiang@intel.com> | 2016-07-21 17:36:30 +0000 |
|---|---|---|
| committer |   Gerrit Code Review <gerrit@172.30.200.206> | 2016-07-21 17:36:30 +0000 |
| commit | 2c4b40f9829b14aa9bf12338f39d4e93474c7c77 (patch) | |
| tree | 4c96faea090807f62f2a97d881f46b0b4ea1d83c | |
| parent | 4463d0ee0febf49c4291962c8326301e3efd27f6 (diff) | |
| parent | 6443c73ab06239ab4b1bc0511d9b78f7122f477d (diff) | |
Merge "KVM: vmx: fix underflow in TSC deadline calculation"
| -rw-r--r-- | kernel/arch/x86/kvm/vmx.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/arch/x86/kvm/vmx.c b/kernel/arch/x86/kvm/vmx.c index e378975f5..5da019be6 100644 --- a/kernel/arch/x86/kvm/vmx.c +++ b/kernel/arch/x86/kvm/vmx.c @@ -10663,9 +10663,9 @@ static inline int u64_shl_div_u64(u64 a, unsigned int shift, static int vmx_set_hv_timer(struct kvm_vcpu *vcpu, u64 guest_deadline_tsc) { struct vcpu_vmx *vmx = to_vmx(vcpu); - u64 tscl = rdtsc(), delta_tsc; - - delta_tsc = guest_deadline_tsc - kvm_read_l1_tsc(vcpu, tscl); + u64 tscl = rdtsc(); + u64 guest_tscl = kvm_read_l1_tsc(vcpu, tscl); + u64 delta_tsc = max(guest_deadline_tsc, guest_tscl) - guest_tscl; /* Convert to host delta tsc if tsc scaling is enabled */ if (vcpu->arch.tsc_scaling_ratio != kvm_default_tsc_scaling_ratio && |