leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

KVM: VMX: Skip delta_tsc shift-and-divide if the dividend is zero

Browse Source 
Ten percent of nothin' is... let me do the math here.  Nothin' into
nothin', carry the nothin'...

Cc: Wanpeng Li <wanpengli@tencent.com>
Reviewed-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2019-04-16 13:32:48 -07:00 committed by Paolo Bonzini
parent 4ca88b3f86
commit 0967fa1cd3
1 changed files with 2 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/x86/kvm/vmx/vmx.c
View File

@ -7063,10 +7063,9 @@ static int vmx_set_hv_timer(struct kvm_vcpu *vcpu, u64 guest_deadline_tsc,
/* Convert to host delta tsc if tsc scaling is enabled */ /* Convert to host delta tsc if tsc scaling is enabled */
if (vcpu->arch.tsc_scaling_ratio != kvm_default_tsc_scaling_ratio && if (vcpu->arch.tsc_scaling_ratio != kvm_default_tsc_scaling_ratio &&
u64_shl_div_u64(delta_tsc, delta_tsc && u64_shl_div_u64(delta_tsc,
kvm_tsc_scaling_ratio_frac_bits, kvm_tsc_scaling_ratio_frac_bits,
vcpu->arch.tsc_scaling_ratio, vcpu->arch.tsc_scaling_ratio, &delta_tsc))
&delta_tsc))
return -ERANGE; return -ERANGE;
/* /*