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[PATCH v3 25/28] tcg: Round the tb_size default from qemu_get_host_physm
From: |
Richard Henderson |
Subject: |
[PATCH v3 25/28] tcg: Round the tb_size default from qemu_get_host_physmem |
Date: |
Sun, 2 May 2021 16:18:41 -0700 |
If qemu_get_host_physmem returns an odd number of pages,
then physmem / 8 will not be a multiple of the page size.
The following was observed on a gitlab runner:
ERROR qtest-arm/boot-serial-test - Bail out!
ERROR:../util/osdep.c:80:qemu_mprotect__osdep: \
assertion failed: (!(size & ~qemu_real_host_page_mask))
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
tcg/region.c | 47 +++++++++++++++++++++--------------------------
1 file changed, 21 insertions(+), 26 deletions(-)
diff --git a/tcg/region.c b/tcg/region.c
index b3f0b9bda5..49764b40dc 100644
--- a/tcg/region.c
+++ b/tcg/region.c
@@ -469,26 +469,6 @@ static size_t tcg_n_regions(size_t tb_size, unsigned
max_cpus)
(DEFAULT_CODE_GEN_BUFFER_SIZE_1 < MAX_CODE_GEN_BUFFER_SIZE \
? DEFAULT_CODE_GEN_BUFFER_SIZE_1 : MAX_CODE_GEN_BUFFER_SIZE)
-static size_t size_code_gen_buffer(size_t tb_size)
-{
- /* Size the buffer. */
- if (tb_size == 0) {
- size_t phys_mem = qemu_get_host_physmem();
- if (phys_mem == 0) {
- tb_size = DEFAULT_CODE_GEN_BUFFER_SIZE;
- } else {
- tb_size = MIN(DEFAULT_CODE_GEN_BUFFER_SIZE, phys_mem / 8);
- }
- }
- if (tb_size < MIN_CODE_GEN_BUFFER_SIZE) {
- tb_size = MIN_CODE_GEN_BUFFER_SIZE;
- }
- if (tb_size > MAX_CODE_GEN_BUFFER_SIZE) {
- tb_size = MAX_CODE_GEN_BUFFER_SIZE;
- }
- return tb_size;
-}
-
#ifdef __mips__
/* In order to use J and JAL within the code_gen_buffer, we require
that the buffer not cross a 256MB boundary. */
@@ -836,13 +816,29 @@ static int alloc_code_gen_buffer(size_t size, int
splitwx, Error **errp)
*/
void tcg_region_init(size_t tb_size, int splitwx, unsigned max_cpus)
{
- size_t page_size;
+ const size_t page_size = qemu_real_host_page_size;
size_t region_size;
size_t i;
int have_prot;
- have_prot = alloc_code_gen_buffer(size_code_gen_buffer(tb_size),
- splitwx, &error_fatal);
+ /* Size the buffer. */
+ if (tb_size == 0) {
+ size_t phys_mem = qemu_get_host_physmem();
+ if (phys_mem == 0) {
+ tb_size = DEFAULT_CODE_GEN_BUFFER_SIZE;
+ } else {
+ tb_size = QEMU_ALIGN_DOWN(phys_mem / 8, page_size);
+ tb_size = MIN(DEFAULT_CODE_GEN_BUFFER_SIZE, tb_size);
+ }
+ }
+ if (tb_size < MIN_CODE_GEN_BUFFER_SIZE) {
+ tb_size = MIN_CODE_GEN_BUFFER_SIZE;
+ }
+ if (tb_size > MAX_CODE_GEN_BUFFER_SIZE) {
+ tb_size = MAX_CODE_GEN_BUFFER_SIZE;
+ }
+
+ have_prot = alloc_code_gen_buffer(tb_size, splitwx, &error_fatal);
assert(have_prot >= 0);
/* Request large pages for the buffer and the splitwx. */
@@ -857,9 +853,8 @@ void tcg_region_init(size_t tb_size, int splitwx, unsigned
max_cpus)
* As a result of this we might end up with a few extra pages at the end of
* the buffer; we will assign those to the last region.
*/
- region.n = tcg_n_regions(region.total_size, max_cpus);
- page_size = qemu_real_host_page_size;
- region_size = region.total_size / region.n;
+ region.n = tcg_n_regions(tb_size, max_cpus);
+ region_size = tb_size / region.n;
region_size = QEMU_ALIGN_DOWN(region_size, page_size);
/* A region must have at least 2 pages; one code, one guard */
--
2.25.1
- [PATCH v3 20/28] tcg: Move in_code_gen_buffer and tests to region.c, (continued)
- [PATCH v3 20/28] tcg: Move in_code_gen_buffer and tests to region.c, Richard Henderson, 2021/05/02
- [PATCH v3 23/28] tcg: Sink qemu_madvise call to common code, Richard Henderson, 2021/05/02
- [PATCH v3 27/28] tcg: When allocating for !splitwx, begin with PROT_NONE, Richard Henderson, 2021/05/02
- [PATCH v3 28/28] tcg: Move tcg_init_ctx and tcg_ctx from accel/tcg/, Richard Henderson, 2021/05/02
- [PATCH v3 19/28] tcg: Tidy split_cross_256mb, Richard Henderson, 2021/05/02
- [PATCH v3 26/28] tcg: Merge buffer protection and guard page protection, Richard Henderson, 2021/05/02
- [PATCH v3 09/28] accel/tcg: Move alloc_code_gen_buffer to tcg/region.c, Richard Henderson, 2021/05/02
- [PATCH v3 12/28] accel/tcg: Merge tcg_exec_init into tcg_init_machine, Richard Henderson, 2021/05/02
- [PATCH v3 13/28] accel/tcg: Pass down max_cpus to tcg_init, Richard Henderson, 2021/05/02
- [PATCH v3 14/28] tcg: Introduce tcg_max_ctxs, Richard Henderson, 2021/05/02
- [PATCH v3 25/28] tcg: Round the tb_size default from qemu_get_host_physmem,
Richard Henderson <=
- Re: [PATCH v3 00/28] tcg: Clean up code_gen_buffer allocation, no-reply, 2021/05/02