On Tue, Jun 16, 2020 at 03:15:02PM +0100, Marc Zyngier wrote: > commit ef3e40a7ea8dbe2abd0a345032cd7d5023b9684f upstream > > When using the PtrAuth feature in a guest, we need to save the host's > keys before allowing the guest to program them. For that, we dump > them in a per-CPU data structure (the so called host context). > > But both call sites that do this are in preemptible context, > which may end up in disaster should the vcpu thread get preempted > before reentering the guest. > > Instead, save the keys eagerly on each vcpu_load(). This has an > increased overhead, but is at least safe. > > Cc: stable@xxxxxxxxxxxxxxx > Reviewed-by: Mark Rutland <mark.rutland@xxxxxxx> > Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx> > --- > arch/arm/include/asm/kvm_emulate.h | 3 ++- > arch/arm64/include/asm/kvm_emulate.h | 6 ------ > arch/arm64/kvm/handle_exit.c | 19 ++----------------- > virt/kvm/arm/arm.c | 22 +++++++++++++++++++++- > 4 files changed, 25 insertions(+), 25 deletions(-) Both now queued up, thanks. greg k-h
