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accel/tcg: Introduce page_find_range_empty

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Use the interval tree to locate an unused range in the VM.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230707204054.8792-17-richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-07-07 21:40:44 +01:00
parent 99982beb4d
commit f2bb7cf299
2 changed files with 56 additions and 0 deletions
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15
include/exec/cpu-all.h
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@ -236,6 +236,21 @@ int page_check_range(target_ulong start, target_ulong len, int flags);
*/
bool page_check_range_empty(target_ulong start, target_ulong last);
/**
* page_find_range_empty
* @min: first byte of search range
* @max: last byte of search range
* @len: size of the hole required
* @align: alignment of the hole required (power of 2)
*
* If there is a range [x, x+@len) within [@min, @max] such that
* x % @align == 0, then return x. Otherwise return -1.
* The memory lock must be held, as the caller will want to ensure
* the returned range stays empty until a new mapping can be installed.
*/
target_ulong page_find_range_empty(target_ulong min, target_ulong max,
target_ulong len, target_ulong align);
/**
* page_get_target_data(address)
* @address: guest virtual address