On Sat, Apr 25, 2020 at 10:43:21AM +0100, Marc Zyngier wrote: > We currently save/restore sp_el0 in C code. This is a bit unsafe, > as a lot of the C code expects 'current' to be accessible from > there (and the opportunity to run kernel code in HYP is specially > great with VHE). > > Instead, let's move the save/restore of sp_el0 to the assembly > code (in __guest_enter), making sure that sp_el0 is correct > very early on when we exit the guest, and is preserved as long > as possible to its host value when we enter the guest. > > Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx> > --- > arch/arm64/kvm/hyp/entry.S | 23 +++++++++++++++++++++++ > arch/arm64/kvm/hyp/sysreg-sr.c | 17 +++-------------- > 2 files changed, 26 insertions(+), 14 deletions(-) > Reviewed-by: Andrew Jones <drjones@xxxxxxxxxx>
