[v4] target/arm: Implement ARMv8.1-VHE

[PATCH v4 33/40] target/arm: check TGE and E2H flags for EL0 pauth traps

Posted by Richard Henderson 5 years, 11 months ago

From: Alex Bennée <alex.bennee@linaro.org>

According to ARM ARM we should only trap from the EL1&0 regime.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/arm/pauth_helper.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/target/arm/pauth_helper.c b/target/arm/pauth_helper.c
index 42c9141bb7..c3cb7c8d52 100644
--- a/target/arm/pauth_helper.c
+++ b/target/arm/pauth_helper.c
@@ -371,7 +371,10 @@ static void pauth_check_trap(CPUARMState *env, int el, uintptr_t ra)
     if (el < 2 && arm_feature(env, ARM_FEATURE_EL2)) {
         uint64_t hcr = arm_hcr_el2_eff(env);
         bool trap = !(hcr & HCR_API);
-        /* FIXME: ARMv8.1-VHE: trap only applies to EL1&0 regime.  */
+        if (el == 0) {
+            /* Trap only applies to EL1&0 regime.  */
+            trap &= (hcr & (HCR_E2H | HCR_TGE)) != (HCR_E2H | HCR_TGE);
+        }
         /* FIXME: ARMv8.3-NV: HCR_NV trap takes precedence for ERETA[AB].  */
         if (trap) {
             pauth_trap(env, 2, ra);
-- 
2.17.1

Re: [PATCH v4 33/40] target/arm: check TGE and E2H flags for EL0 pauth traps

Posted by Peter Maydell 5 years, 11 months ago

On Tue, 3 Dec 2019 at 02:30, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> From: Alex Bennée <alex.bennee@linaro.org>
>
> According to ARM ARM we should only trap from the EL1&0 regime.
>
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>  target/arm/pauth_helper.c | 5 ++++-

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

thanks
-- PMM