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[PATCH for-8.0 v2 06/12] accel/tcg: Pass last not end to PAGE_FOR_EACH_T
From: |
Richard Henderson |
Subject: |
[PATCH for-8.0 v2 06/12] accel/tcg: Pass last not end to PAGE_FOR_EACH_TB |
Date: |
Mon, 27 Mar 2023 14:18:18 -0700 |
Pass the address of the last byte to be changed, rather than
the first address past the last byte. This avoids overflow
when the last page of the address space is involved.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
accel/tcg/tb-maint.c | 28 ++++++++++++++++------------
1 file changed, 16 insertions(+), 12 deletions(-)
diff --git a/accel/tcg/tb-maint.c b/accel/tcg/tb-maint.c
index a173db17e6..04d2751bb6 100644
--- a/accel/tcg/tb-maint.c
+++ b/accel/tcg/tb-maint.c
@@ -127,29 +127,29 @@ static void tb_remove(TranslationBlock *tb)
}
/* TODO: For now, still shared with translate-all.c for system mode. */
-#define PAGE_FOR_EACH_TB(start, end, pagedesc, T, N) \
- for (T = foreach_tb_first(start, end), \
- N = foreach_tb_next(T, start, end); \
+#define PAGE_FOR_EACH_TB(start, last, pagedesc, T, N) \
+ for (T = foreach_tb_first(start, last), \
+ N = foreach_tb_next(T, start, last); \
T != NULL; \
- T = N, N = foreach_tb_next(N, start, end))
+ T = N, N = foreach_tb_next(N, start, last))
typedef TranslationBlock *PageForEachNext;
static PageForEachNext foreach_tb_first(tb_page_addr_t start,
- tb_page_addr_t end)
+ tb_page_addr_t last)
{
- IntervalTreeNode *n = interval_tree_iter_first(&tb_root, start, end - 1);
+ IntervalTreeNode *n = interval_tree_iter_first(&tb_root, start, last);
return n ? container_of(n, TranslationBlock, itree) : NULL;
}
static PageForEachNext foreach_tb_next(PageForEachNext tb,
tb_page_addr_t start,
- tb_page_addr_t end)
+ tb_page_addr_t last)
{
IntervalTreeNode *n;
if (tb) {
- n = interval_tree_iter_next(&tb->itree, start, end - 1);
+ n = interval_tree_iter_next(&tb->itree, start, last);
if (n) {
return container_of(n, TranslationBlock, itree);
}
@@ -320,7 +320,7 @@ struct page_collection {
};
typedef int PageForEachNext;
-#define PAGE_FOR_EACH_TB(start, end, pagedesc, tb, n) \
+#define PAGE_FOR_EACH_TB(start, last, pagedesc, tb, n) \
TB_FOR_EACH_TAGGED((pagedesc)->first_tb, tb, n, page_next)
#ifdef CONFIG_DEBUG_TCG
@@ -995,10 +995,11 @@ void tb_invalidate_phys_range(tb_page_addr_t start,
tb_page_addr_t end)
{
TranslationBlock *tb;
PageForEachNext n;
+ tb_page_addr_t last = end - 1;
assert_memory_lock();
- PAGE_FOR_EACH_TB(start, end, unused, tb, n) {
+ PAGE_FOR_EACH_TB(start, last, unused, tb, n) {
tb_phys_invalidate__locked(tb);
}
}
@@ -1030,6 +1031,7 @@ bool tb_invalidate_phys_page_unwind(tb_page_addr_t addr,
uintptr_t pc)
bool current_tb_modified;
TranslationBlock *tb;
PageForEachNext n;
+ tb_page_addr_t last;
/*
* Without precise smc semantics, or when outside of a TB,
@@ -1046,10 +1048,11 @@ bool tb_invalidate_phys_page_unwind(tb_page_addr_t
addr, uintptr_t pc)
assert_memory_lock();
current_tb = tcg_tb_lookup(pc);
+ last = addr | ~TARGET_PAGE_MASK;
addr &= TARGET_PAGE_MASK;
current_tb_modified = false;
- PAGE_FOR_EACH_TB(addr, addr + TARGET_PAGE_SIZE, unused, tb, n) {
+ PAGE_FOR_EACH_TB(addr, last, unused, tb, n) {
if (current_tb == tb &&
(tb_cflags(current_tb) & CF_COUNT_MASK) != 1) {
/*
@@ -1091,12 +1094,13 @@ tb_invalidate_phys_page_range__locked(struct
page_collection *pages,
bool current_tb_modified = false;
TranslationBlock *current_tb = retaddr ? tcg_tb_lookup(retaddr) : NULL;
#endif /* TARGET_HAS_PRECISE_SMC */
+ tb_page_addr_t last G_GNUC_UNUSED = end - 1;
/*
* We remove all the TBs in the range [start, end[.
* XXX: see if in some cases it could be faster to invalidate all the code
*/
- PAGE_FOR_EACH_TB(start, end, p, tb, n) {
+ PAGE_FOR_EACH_TB(start, last, p, tb, n) {
/* NOTE: this is subtle as a TB may span two physical pages */
if (n == 0) {
/* NOTE: tb_end may be after the end of the page, but
--
2.34.1
- [PATCH for-8.0 v2 00/12] tcg patch queue, Richard Henderson, 2023/03/27
- [PATCH for-8.0 v2 02/12] tcg: use QTree instead of GTree, Richard Henderson, 2023/03/27
- [PATCH for-8.0 v2 01/12] util: import GTree as QTree, Richard Henderson, 2023/03/27
- [PATCH for-8.0 v2 04/12] accel/tcg: Pass last not end to page_set_flags, Richard Henderson, 2023/03/27
- [PATCH for-8.0 v2 05/12] accel/tcg: Pass last not end to page_reset_target_data, Richard Henderson, 2023/03/27
- [PATCH for-8.0 v2 03/12] linux-user: Diagnose misaligned -R size, Richard Henderson, 2023/03/27
- [PATCH for-8.0 v2 06/12] accel/tcg: Pass last not end to PAGE_FOR_EACH_TB,
Richard Henderson <=
- [PATCH for-8.0 v2 07/12] accel/tcg: Pass last not end to page_collection_lock, Richard Henderson, 2023/03/27
- [PATCH for-8.0 v2 08/12] accel/tcg: Pass last not end to tb_invalidate_phys_page_range__locked, Richard Henderson, 2023/03/27
- [PATCH for-8.0 v2 09/12] accel/tcg: Pass last not end to tb_invalidate_phys_range, Richard Henderson, 2023/03/27
- [PATCH for-8.0 v2 10/12] linux-user: Pass last not end to probe_guest_base, Richard Henderson, 2023/03/27
- [PATCH for-8.0 v2 11/12] include/exec: Change reserved_va semantics to last byte, Richard Henderson, 2023/03/27
- [PATCH for-8.0 v2 12/12] linux-user/arm: Take more care allocating commpage, Richard Henderson, 2023/03/27