kvm: fix wrong address when writing Hyper-V tsc page
authorXiaoming Gao <newtongao@tencent.com>
Thu, 19 Jun 2014 11:14:57 +0000 (19:14 +0800)
committerPaolo Bonzini <pbonzini@redhat.com>
Thu, 19 Jun 2014 11:43:43 +0000 (13:43 +0200)
commite1fa108d24697b78348fd4e5a531029a50d0d36d
tree431449b3d20ef5a7b92f7f376e4f4ee6b202a179
parent682367c494869008eb89ef733f196e99415ae862
kvm: fix wrong address when writing Hyper-V tsc page

When kvm_write_guest writes the tsc_ref structure to the guest, or it will lead
the low HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT bits of the TSC page address
must be cleared, or the guest can see a non-zero sequence number.

Otherwise Windows guests would not be able to get a correct clocksource
(QueryPerformanceCounter will always return 0) which causes serious chaos.

Signed-off-by: Xiaoming Gao <newtongao@tencnet.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/kvm/x86.c