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linux-user/hppa: Simplify init_guest_commpage

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If reserved_va, then we have already reserved the entire
guest virtual address space; no need to remap page.
If !reserved_va, then use MAP_FIXED_NOREPLACE.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Ilya Leoshkevich <iii@linux.ibm.com>
Acked-by: Helge Deller <deller@gmx.de>
Message-Id: <20240102015808.132373-6-richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2024-01-02 12:57:40 +11:00
parent d17b684c10
commit d1fc62303e
1 changed files with 13 additions and 9 deletions
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10
linux-user/elfload.c
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@ -1970,10 +1970,13 @@ static inline void init_thread(struct target_pt_regs *regs,
static bool init_guest_commpage(void) static bool init_guest_commpage(void)
{ {
void *want = g2h_untagged(LO_COMMPAGE); /* If reserved_va, then we have already mapped 0 page on the host. */
void *addr = mmap(want, qemu_host_page_size, PROT_NONE, if (!reserved_va) {
MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0); void *want, *addr;
want = g2h_untagged(LO_COMMPAGE);
addr = mmap(want, TARGET_PAGE_SIZE, PROT_NONE,
MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED_NOREPLACE, -1, 0);
if (addr == MAP_FAILED) { if (addr == MAP_FAILED) {
perror("Allocating guest commpage"); perror("Allocating guest commpage");
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
@ -1981,6 +1984,7 @@ static bool init_guest_commpage(void)
if (addr != want) { if (addr != want) {
return false; return false;
} }
}
/* /*
* On Linux, page zero is normally marked execute only + gateway. * On Linux, page zero is normally marked execute only + gateway.