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tcg: Round the tb_size default from qemu_get_host_physmem 

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))

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Luis Pires <luis.pires@eldorado.org.br>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-03-14 13:32:18 -06:00
parent d7107fc00a
commit ba22783d6e
1 changed files with 21 additions and 26 deletions
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47
tcg/region.c
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@ -470,26 +470,6 @@ 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
@ -841,13 +821,29 @@ 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. */
@ -862,9 +858,8 @@ 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 */