kvm: fix wrong address when writing Hyper-V tsc page

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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>

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Xiaoming Gao 2014-06-19 19:14:57 +08:00 • committed by Paolo Bonzini

parent 682367c494

commit e1fa108d24

1 changed files with 1 additions and 1 deletions

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arch/x86/kvm/x86.c

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