From: Xiaoming Gao <newtongao@tencent.com>
Date: Thu, 19 Jun 2014 11:14:57 +0000 (+0800)
Subject: kvm: fix wrong address when writing Hyper-V tsc page
X-Git-Tag: omap-for-v3.16/fixes-rc4~31^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e1fa108d24697b78348fd4e5a531029a50d0d36d;p=pandora-kernel.git

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>
---

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