Hi Christoffer,

On 01/12/2018 12:07 PM, Christoffer Dall wrote:
There's a semantic difference between the EL1 registers that control
operation of a kernel running in EL1 and EL1 registers that only control
userspace execution in EL0.  Since we can defer saving/restoring the
latter, move them into their own function.

We also take this chance to rename the function saving/restoring the
remaining system register to make it clear this function deals with
the EL1 system registers.

No functional change.

Reviewed-by: Andrew Jones <drjo...@redhat.com>
Signed-off-by: Christoffer Dall <christoffer.d...@linaro.org>
  arch/arm64/kvm/hyp/sysreg-sr.c | 46 +++++++++++++++++++++++++++++++-----------
  1 file changed, 34 insertions(+), 12 deletions(-)

diff --git a/arch/arm64/kvm/hyp/sysreg-sr.c b/arch/arm64/kvm/hyp/sysreg-sr.c
index 848a46eb33bf..99dd50ce483b 100644
--- a/arch/arm64/kvm/hyp/sysreg-sr.c
+++ b/arch/arm64/kvm/hyp/sysreg-sr.c
@@ -34,18 +34,27 @@ static void __hyp_text __sysreg_do_nothing(struct 
kvm_cpu_context *ctxt) { }
static void __hyp_text __sysreg_save_common_state(struct kvm_cpu_context *ctxt)
-       ctxt->sys_regs[ACTLR_EL1]    = read_sysreg(actlr_el1);

I am a bit confused, the comment on top of the function says the host must save ACTLR_EL1 in the VHE case. But AFAICT, after this patch the register will not get saved in the host context. Did I miss anything?


Julien Grall
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