diff options
| author | Avi Kivity <avi@redhat.com> | 2010-07-06 04:30:49 -0400 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2010-07-06 04:41:31 -0400 |
| commit | da38f43859467a8048365b9e1cce99ccbc62b6e2 (patch) | |
| tree | b36e9200ded220e1e7499dad8f64c742db451088 /arch/x86/kvm/mmu.c | |
| parent | 815c4163b6c8ebf8152f42b0a5fd015cfdcedc78 (diff) | |
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>
Diffstat (limited to 'arch/x86/kvm/mmu.c')
0 files changed, 0 insertions, 0 deletions