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linux-user/aarch64: Reset target data on MADV_DONTNEED

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aarch64 stores MTE tags in target_date, and they should be reset by
MADV_DONTNEED.

Signed-off-by: Vitaly Buka <vitalybuka@google.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220711220028.2467290-1-vitalybuka@google.com>
[lv: fix code style issues]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Vitaly Buka 2022-07-11 15:00:28 -07:00 committed by Laurent Vivier
parent a6b1c53e79
commit dbbf89751b
3 changed files with 30 additions and 0 deletions
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26
accel/tcg/translate-all.c
View file

@ -2314,6 +2314,32 @@ void page_set_flags(target_ulong start, target_ulong end, int flags)
}
}
void page_reset_target_data(target_ulong start, target_ulong end)
{
target_ulong addr, len;
/*
* This function should never be called with addresses outside the
* guest address space. If this assert fires, it probably indicates
* a missing call to h2g_valid.
*/
assert(end - 1 <= GUEST_ADDR_MAX);
assert(start < end);
assert_memory_lock();
start = start & TARGET_PAGE_MASK;
end = TARGET_PAGE_ALIGN(end);
for (addr = start, len = end - start;
len != 0;
len -= TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) {
PageDesc *p = page_find_alloc(addr >> TARGET_PAGE_BITS, 1);
g_free(p->target_data);
p->target_data = NULL;
}
}
void *page_get_target_data(target_ulong address)
{
PageDesc *p = page_find(address >> TARGET_PAGE_BITS);

1
include/exec/cpu-all.h
View file

@ -271,6 +271,7 @@ int walk_memory_regions(void *, walk_memory_regions_fn);
int page_get_flags(target_ulong address);
void page_set_flags(target_ulong start, target_ulong end, int flags);
void page_reset_target_data(target_ulong start, target_ulong end);
int page_check_range(target_ulong start, target_ulong len, int flags);
/**

3
linux-user/mmap.c
View file

@ -894,6 +894,9 @@ abi_long target_madvise(abi_ulong start, abi_ulong len_in, int advice)
if (advice == MADV_DONTNEED &&
can_passthrough_madv_dontneed(start, end)) {
ret = get_errno(madvise(g2h_untagged(start), len, MADV_DONTNEED));
if (ret == 0) {
page_reset_target_data(start, start + len);
}
}
mmap_unlock();