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KVM: X86: Implement call-back to propagate virtual_tsc_khz

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This patch implements a call-back into the architecture code
to allow the propagation of changes to the virtual tsc_khz
of the vcpu.
On SVM it updates the tsc_ratio variable, on VMX it does
nothing.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Joerg Roedel
2011-03-25 09:44:49 +01:00
committed by Avi Kivity
parent 8f6055cbaf
commit 4051b18801
3 changed files with 45 additions and 0 deletions
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11
arch/x86/kvm/vmx.c
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@ -1160,6 +1160,16 @@ static u64 guest_read_tsc(void)
return host_tsc + tsc_offset;
}
/*
* Empty call-back. Needs to be implemented when VMX enables the SET_TSC_KHZ
* ioctl. In this case the call-back should update internal vmx state to make
* the changes effective.
*/
static void vmx_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz)
{
/* Nothing to do here */
}
/*
* writes 'offset' into guest's timestamp counter offset register
*/
@ -4497,6 +4507,7 @@ static struct kvm_x86_ops vmx_x86_ops = {
.has_wbinvd_exit = cpu_has_vmx_wbinvd_exit,
.set_tsc_khz = vmx_set_tsc_khz,
.write_tsc_offset = vmx_write_tsc_offset,
.adjust_tsc_offset = vmx_adjust_tsc_offset,