On 12/7/18 12:39 PM, Kristina Martsenko wrote: > From: Mark Rutland <[email protected]> > > To allow EL0 (and/or EL1) to use pointer authentication functionality, > we must ensure that pointer authentication instructions and accesses to > pointer authentication keys are not trapped to EL2. > > This patch ensures that HCR_EL2 is configured appropriately when the > kernel is booted at EL2. For non-VHE kernels we set HCR_EL2.{API,APK}, > ensuring that EL1 can access keys and permit EL0 use of instructions. > For VHE kernels host EL0 (TGE && E2H) is unaffected by these settings, > and it doesn't matter how we configure HCR_EL2.{API,APK}, so we don't > bother setting them. > > This does not enable support for KVM guests, since KVM manages HCR_EL2 > itself when running VMs. > > Signed-off-by: Mark Rutland <[email protected]> > Signed-off-by: Kristina Martsenko <[email protected]> > Acked-by: Christoffer Dall <[email protected]> > Cc: Catalin Marinas <[email protected]> > Cc: Marc Zyngier <[email protected]> > Cc: Will Deacon <[email protected]> > Cc: [email protected] > --- > arch/arm64/include/asm/kvm_arm.h | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-)
Reviewed-by: Richard Henderson <[email protected]> r~
