On Tue 2017-03-14 10:05:08, Thomas Garnier wrote: > This patch makes the GDT remapped pages read-only to prevent corruption. > This change is done only on 64-bit. > > The native_load_tr_desc function was adapted to correctly handle a > read-only GDT. The LTR instruction always writes to the GDT TSS entry. > This generates a page fault if the GDT is read-only. This change checks > if the current GDT is a remap and swap GDTs as needed. This function was > tested by booting multiple machines and checking hibernation works > properly. > > KVM SVM and VMX were adapted to use the writeable GDT. On VMX, the > per-cpu variable was removed for functions to fetch the original GDT. > Instead of reloading the previous GDT, VMX will reload the fixmap GDT as > expected. For testing, VMs were started and restored on multiple > configurations. > > Signed-off-by: Thomas Garnier <thgar...@google.com>
Can we get the same change for 32-bit, too? Growing differences
between 32 and 64 bit are a bit of a problem...
Pavel
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