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accel/tcg: Make page_alloc_target_data allocation constant

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Use a constant target data allocation size for all pages.
This will be necessary to reduce overhead of page tracking.
Since TARGET_PAGE_DATA_SIZE is now required, we can use this
to omit data tracking for targets that don't require it.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2022-09-17 14:25:12 +02:00
parent 7ed9e721cc
commit 50d4c8c1d4
5 changed files with 19 additions and 13 deletions
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8
target/arm/cpu.h
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@ -3410,6 +3410,14 @@ extern const uint64_t pred_esz_masks[5];
#define PAGE_MTE PAGE_TARGET_2
#define PAGE_TARGET_STICKY PAGE_MTE
/* We associate one allocation tag per 16 bytes, the minimum. */
#define LOG2_TAG_GRANULE 4
#define TAG_GRANULE (1 << LOG2_TAG_GRANULE)
#ifdef CONFIG_USER_ONLY
#define TARGET_PAGE_DATA_SIZE (TARGET_PAGE_SIZE >> (LOG2_TAG_GRANULE + 1))
#endif
#ifdef TARGET_TAGGED_ADDRESSES
/**
* cpu_untagged_addr:

4
target/arm/internals.h
View file

@ -1164,10 +1164,6 @@ void arm_log_exception(CPUState *cs);
*/
#define GMID_EL1_BS 6
/* We associate one allocation tag per 16 bytes, the minimum. */
#define LOG2_TAG_GRANULE 4
#define TAG_GRANULE (1 << LOG2_TAG_GRANULE)
/*
* SVE predicates are 1/8 the size of SVE vectors, and cannot use
* the same simd_desc() encoding due to restrictions on size.

3
target/arm/mte_helper.c
View file

@ -96,8 +96,7 @@ static uint8_t *allocation_tag_mem(CPUARMState *env, int ptr_mmu_idx,
tags = page_get_target_data(clean_ptr);
if (tags == NULL) {
size_t alloc_size = TARGET_PAGE_SIZE >> (LOG2_TAG_GRANULE + 1);
tags = page_alloc_target_data(clean_ptr, alloc_size);
tags = page_alloc_target_data(clean_ptr);
assert(tags != NULL);
}