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[Qemu-devel] [PATCH 14/22] translate-all: work page-by-page in tb_invali
From: |
Emilio G. Cota |
Subject: |
[Qemu-devel] [PATCH 14/22] translate-all: work page-by-page in tb_invalidate_phys_range_1 |
Date: |
Mon, 7 Aug 2017 19:52:30 -0400 |
So that we pass a same-page range to tb_invalidate_phys_page_range,
instead of always passing an end address that could be on a different
page.
As discussed with Peter Maydell on the list, tb_invalidate_phys_page_range
doesn't actually do much with 'end', which explains why we have never
hit a bug despite going against what the comment on top of
tb_invalidate_phys_page_range requires:
> * Invalidate all TBs which intersect with the target physical address range
> * [start;end[. NOTE: start and end must refer to the *same* physical page.
The appended honours the comment, which avoids confusion.
While at it, rework the loop into a for loop, which is less error prone
(e.g. "continue" won't result in an infinite loop).
Signed-off-by: Emilio G. Cota <address@hidden>
---
accel/tcg/translate-all.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index 64d099b..e8f663f 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -1372,10 +1372,14 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
*/
static void tb_invalidate_phys_range_1(tb_page_addr_t start, tb_page_addr_t
end)
{
- while (start < end) {
- tb_invalidate_phys_page_range(start, end, 0);
- start &= TARGET_PAGE_MASK;
- start += TARGET_PAGE_SIZE;
+ tb_page_addr_t next;
+
+ for (next = (start & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE;
+ start < end;
+ start = next, next += TARGET_PAGE_SIZE) {
+ tb_page_addr_t bound = MIN(next, end);
+
+ tb_invalidate_phys_page_range(start, bound, 0);
}
}
--
2.7.4
- [Qemu-devel] [PATCH 08/22] tcg: move tb_ctx.tb_phys_invalidate_count to tcg_ctx, (continued)
- [Qemu-devel] [PATCH 08/22] tcg: move tb_ctx.tb_phys_invalidate_count to tcg_ctx, Emilio G. Cota, 2017/08/07
- [Qemu-devel] [PATCH 13/22] translate-all: remove hole in PageDesc, Emilio G. Cota, 2017/08/07
- [Qemu-devel] [PATCH 12/22] translate-all: make l1_map lockless, Emilio G. Cota, 2017/08/07
- [Qemu-devel] [PATCH 05/22] qht: require a default comparison function, Emilio G. Cota, 2017/08/07
- [Qemu-devel] [PATCH 06/22] qht: return existing entry when qht_insert fails, Emilio G. Cota, 2017/08/07
- [Qemu-devel] [PATCH 15/22] translate-all: move tb_invalidate_phys_page_range up in the file, Emilio G. Cota, 2017/08/07
- [Qemu-devel] [PATCH 10/22] translate-all: iterate over TBs in a page with page_for_each_tb, Emilio G. Cota, 2017/08/07
- [Qemu-devel] [PATCH 17/22] translate-all: discard TB when tb_link_page returns an existing matching TB, Emilio G. Cota, 2017/08/07
- [Qemu-devel] [PATCH 16/22] translate-all: use per-page locking in !user-mode, Emilio G. Cota, 2017/08/07
- [Qemu-devel] [PATCH 07/22] tcg: track TBs with per-region BST's, Emilio G. Cota, 2017/08/07
- [Qemu-devel] [PATCH 14/22] translate-all: work page-by-page in tb_invalidate_phys_range_1,
Emilio G. Cota <=
- [Qemu-devel] [PATCH 18/22] translate-all: protect TB jumps with a per-destination-TB lock, Emilio G. Cota, 2017/08/07
- [Qemu-devel] [PATCH 20/22] exec: remove tb_lock from notdirty_mem_write, Emilio G. Cota, 2017/08/07
- [Qemu-devel] [PATCH 19/22] cputlb: remove tb_lock from tlb_flush functions, Emilio G. Cota, 2017/08/07
- [Qemu-devel] [PATCH 21/22] translate-all: remove tb_lock mention from cpu_restore_state_from_tb, Emilio G. Cota, 2017/08/07
- [Qemu-devel] [PATCH 22/22] tcg: remove tb_lock, Emilio G. Cota, 2017/08/07
- Re: [Qemu-devel] [PATCH 00/22] tcg: tb_lock removal, Emilio G. Cota, 2017/08/25