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target/arm: Cache the GP bit for a page in MemTxAttrs

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Caching the bit means that we will not have to re-walk the
page tables to look up the bit during translation.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20190128223118.5255-6-richard.henderson@linaro.org
[PMM: no need to OR in guarded bit status]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2019-02-05 16:52:37 +00:00 committed by Peter Maydell
parent d3765835ed
commit 1bafc2ba7e
1 changed files with 6 additions and 0 deletions
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6
target/arm/helper.c
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@ -10577,6 +10577,7 @@ static bool get_phys_addr_lpae(CPUARMState *env, target_ulong address,
bool ttbr1_valid;
uint64_t descaddrmask;
bool aarch64 = arm_el_is_aa64(env, el);
bool guarded = false;
/* TODO:
* This code does not handle the different format TCR for VTCR_EL2.
@ -10756,6 +10757,7 @@ static bool get_phys_addr_lpae(CPUARMState *env, target_ulong address,
}
/* Merge in attributes from table descriptors */
attrs |= nstable << 3; /* NS */
guarded = extract64(descriptor, 50, 1); /* GP */
if (param.hpd) {
/* HPD disables all the table attributes except NSTable. */
break;
@ -10801,6 +10803,10 @@ static bool get_phys_addr_lpae(CPUARMState *env, target_ulong address,
*/
txattrs->secure = false;
}
/* When in aarch64 mode, and BTI is enabled, remember GP in the IOTLB. */
if (aarch64 && guarded && cpu_isar_feature(aa64_bti, cpu)) {
txattrs->target_tlb_bit0 = true;
}
if (cacheattrs != NULL) {
if (mmu_idx == ARMMMUIdx_S2NS) {