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authorMarcelo Tosatti <mtosatti@redhat.com>2008-12-11 14:45:05 -0500
committerAvi Kivity <avi@redhat.com>2009-03-24 05:02:53 -0400
commit53f658b3c33616a4997ee254311b335e59063289 (patch)
treefbef1e51bfa096dd28a00b2449d567f2c3ab6fb9 /arch/x86/kvm/x86.c
parente8c4a4e8a7cc047dfb3c26b2cbc8599ad3460364 (diff)
KVM: VMX: initialize TSC offset relative to vm creation time
VMX initializes the TSC offset for each vcpu at different times, and also reinitializes it for vcpus other than 0 on APIC SIPI message. This bug causes the TSC's to appear unsynchronized in the guest, even if the host is good. Older Linux kernels don't handle the situation very well, so gettimeofday is likely to go backwards in time: http://www.mail-archive.com/kvm@vger.kernel.org/msg02955.html http://sourceforge.net/tracker/index.php?func=detail&aid=2025534&group_id=180599&atid=893831 Fix it by initializating the offset of each vcpu relative to vm creation time, and moving it from vmx_vcpu_reset to vmx_vcpu_setup, out of the APIC MP init path. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
-rw-r--r--arch/x86/kvm/x86.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 873602b5edfd..3b2acfd72d7f 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4170,6 +4170,8 @@ struct kvm *kvm_arch_create_vm(void)
4170 /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */ 4170 /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
4171 set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap); 4171 set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);
4172 4172
4173 rdtscll(kvm->arch.vm_init_tsc);
4174
4173 return kvm; 4175 return kvm;
4174} 4176}
4175 4177