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accel/tcg: Introduce page_check_range_empty

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Examine the interval tree to validate that a region
has no existing mappings.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230707204054.8792-10-richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-07-07 21:40:37 +01:00
parent 4b840f9609
commit c2281ddcf3
2 changed files with 19 additions and 0 deletions
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7
accel/tcg/user-exec.c
View File

@ -598,6 +598,13 @@ int page_check_range(target_ulong start, target_ulong len, int flags)
return ret; return ret;
} }
bool page_check_range_empty(target_ulong start, target_ulong last)
{
assert(last >= start);
assert_memory_lock();
return pageflags_find(start, last) == NULL;
}
void page_protect(tb_page_addr_t address) void page_protect(tb_page_addr_t address)
{ {
PageFlagsNode *p; PageFlagsNode *p;

12
include/exec/cpu-all.h
View File

@ -224,6 +224,18 @@ void page_set_flags(target_ulong start, target_ulong last, int flags);
void page_reset_target_data(target_ulong start, target_ulong last); void page_reset_target_data(target_ulong start, target_ulong last);
int page_check_range(target_ulong start, target_ulong len, int flags); int page_check_range(target_ulong start, target_ulong len, int flags);
/**
* page_check_range_empty:
* @start: first byte of range
* @last: last byte of range
* Context: holding mmap lock
*
* Return true if the entire range [@start, @last] is unmapped.
* The memory lock must be held so that the caller will can ensure
* the result stays true until a new mapping can be installed.
*/
bool page_check_range_empty(target_ulong start, target_ulong last);
/** /**
* page_get_target_data(address) * page_get_target_data(address)
* @address: guest virtual address * @address: guest virtual address