From: Radim Krčmář <rkrcmar@redhat.com>
Date: Fri, 22 May 2015 17:22:10 +0000 (+0200)
Subject: KVM: x86: preserve x2APIC LDR on INIT
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~167^2~55
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c028dd6bb648251b773f900f59e53544278b3b3c;p=pandora-kernel.git

KVM: x86: preserve x2APIC LDR on INIT

Logical x2APIC stops working if we rewrite it with zeros.
The best references are SDM April 2015: 10.12.10.1 Logical Destination
Mode in x2APIC Mode

  [...], the LDR are initialized by hardware based on the value of
  x2APIC ID upon x2APIC state transitions.

and SDM April 2015: 10.12.10.2 Deriving Logical x2APIC ID from the Local
x2APIC ID

  The LDR initialization occurs whenever the x2APIC mode is enabled

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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