From: Avi Kivity <avi@redhat.com>
Date: Tue, 6 Jul 2010 08:30:49 +0000 (+0300)
Subject: KVM: VMX: Fix host MSR_KERNEL_GS_BASE corruption
X-Git-Tag: v2.6.35-rc6~44^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=da38f43859467a8048365b9e1cce99ccbc62b6e2;p=pandora-kernel.git

KVM: VMX: Fix host MSR_KERNEL_GS_BASE corruption

enter_lmode() and exit_lmode() modify the guest's EFER.LMA before calling
vmx_set_efer().  However, the latter function depends on the value of EFER.LMA
to determine whether MSR_KERNEL_GS_BASE needs reloading, via
vmx_load_host_state().  With EFER.LMA changing under its feet, it took the
wrong choice and corrupted userspace's %gs.

This causes 32-on-64 host userspace to fault.

Fix not touching EFER.LMA; instead ask vmx_set_efer() to change it.

Signed-off-by: Avi Kivity <avi@redhat.com>
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