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linux-user: Allow TARGET_PAGE_BITS_VARY

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If set, match the host and guest page sizes.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Acked-by: Helge Deller <deller@gmx.de>
Message-Id: <20240102015808.132373-30-richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2024-01-02 12:58:04 +11:00
parent 33402cea1f
commit ff8a8bbc2a
1 changed files with 13 additions and 3 deletions
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16
linux-user/main.c
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@ -55,6 +55,7 @@
#include "loader.h"
#include "user-mmap.h"
#include "tcg/perf.h"
#include "exec/page-vary.h"
#ifdef CONFIG_SEMIHOSTING
#include "semihosting/semihost.h"
@ -680,6 +681,7 @@ int main(int argc, char **argv, char **envp)
int i;
int ret;
int execfd;
int host_page_size;
unsigned long max_reserved_va;
bool preserve_argv0;
@ -791,6 +793,16 @@ int main(int argc, char **argv, char **envp)
opt_one_insn_per_tb, &error_abort);
ac->init_machine(NULL);
}
/*
* Finalize page size before creating CPUs.
* This will do nothing if !TARGET_PAGE_BITS_VARY.
* The most efficient setting is to match the host.
*/
host_page_size = qemu_real_host_page_size();
set_preferred_target_page_bits(ctz32(host_page_size));
finalize_target_page_bits();
cpu = cpu_create(cpu_type);
env = cpu_env(cpu);
cpu_reset(cpu);
@ -804,8 +816,6 @@ int main(int argc, char **argv, char **envp)
*/
max_reserved_va = MAX_RESERVED_VA(cpu);
if (reserved_va != 0) {
int host_page_size = qemu_real_host_page_size();
if ((reserved_va + 1) % host_page_size) {
char *s = size_to_str(host_page_size);
fprintf(stderr, "Reserved virtual address not aligned mod %s\n", s);
@ -904,7 +914,7 @@ int main(int argc, char **argv, char **envp)
* If we're in a chroot with no /proc, fall back to 1 page.
*/
if (mmap_min_addr == 0) {
mmap_min_addr = qemu_real_host_page_size();
mmap_min_addr = host_page_size;
qemu_log_mask(CPU_LOG_PAGE,
"host mmap_min_addr=0x%lx (fallback)\n",
mmap_min_addr);