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authorNadav Har'El <nyh@il.ibm.com>2011-05-25 23:15:39 +0300
committerAvi Kivity <avi@redhat.com>2011-07-12 11:45:19 +0300
commit7991825b8558a719eb7cfb93c4458d767ae1f2eb (patch)
tree6d9a09a6175a3f607737680525ba9486ac95dbab /arch
parent36cf24e01e9eba8c9ea201202762081ced2f8cdf (diff)
KVM: nVMX: Additional TSC-offset handling
In the unlikely case that L1 does not capture MSR_IA32_TSC, L0 needs to emulate this MSR write by L2 by modifying vmcs02.tsc_offset. We also need to set vmcs12.tsc_offset, for this change to survive the next nested entry (see prepare_vmcs02()). Additionally, we also need to modify vmx_adjust_tsc_offset: The semantics of this function is that the TSC of all guests on this vcpu, L1 and possibly several L2s, need to be adjusted. To do this, we need to adjust vmcs01's tsc_offset (this offset will also apply to each L2s we enter). We can't set vmcs01 now, so we have to remember this adjustment and apply it when we later exit to L1. Signed-off-by: Nadav Har'El <nyh@il.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/vmx.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 10b22619e7e..afc1f06907c 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1766,12 +1766,24 @@ static void vmx_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz)
static void vmx_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
{
vmcs_write64(TSC_OFFSET, offset);
+ if (is_guest_mode(vcpu))
+ /*
+ * We're here if L1 chose not to trap the TSC MSR. Since
+ * prepare_vmcs12() does not copy tsc_offset, we need to also
+ * set the vmcs12 field here.
+ */
+ get_vmcs12(vcpu)->tsc_offset = offset -
+ to_vmx(vcpu)->nested.vmcs01_tsc_offset;
}
static void vmx_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment)
{
u64 offset = vmcs_read64(TSC_OFFSET);
vmcs_write64(TSC_OFFSET, offset + adjustment);
+ if (is_guest_mode(vcpu)) {
+ /* Even when running L2, the adjustment needs to apply to L1 */
+ to_vmx(vcpu)->nested.vmcs01_tsc_offset += adjustment;
+ }
}
static u64 vmx_compute_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc)