KVM: VMX: Fix host MSR_KERNEL_GS_BASE corruption

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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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This commit is contained in:

Avi Kivity 2010-07-06 11:30:49 +03:00

parent 815c4163b6

commit da38f43859

1 changed files with 2 additions and 5 deletions

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arch/x86/kvm/vmx.c

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