static bool init_guest_commpage(void)
{
- ARMCPU *cpu = ARM_CPU(thread_cpu);
- abi_ptr want = HI_COMMPAGE & TARGET_PAGE_MASK;
- abi_ptr addr;
-
- /*
- * M-profile allocates maximum of 2GB address space, so can never
- * allocate the commpage. Skip it.
- */
- if (arm_feature(&cpu->env, ARM_FEATURE_M)) {
- return true;
- }
-
- /*
- * If reserved_va does not cover the commpage, we get an assert
- * in page_set_flags. Produce an intelligent error instead.
- */
- if (reserved_va != 0 && want + TARGET_PAGE_SIZE - 1 > reserved_va) {
- error_report("Allocating guest commpage: -R 0x%" PRIx64 " too small",
- (uint64_t)reserved_va + 1);
- exit(EXIT_FAILURE);
- }
-
- addr = target_mmap(want, TARGET_PAGE_SIZE, PROT_READ | PROT_WRITE,
- MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
+ abi_ptr commpage = HI_COMMPAGE & -qemu_host_page_size;
+ void *want = g2h_untagged(commpage);
+ void *addr = mmap(want, qemu_host_page_size, PROT_READ | PROT_WRITE,
+ MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
- if (addr == -1) {
+ if (addr == MAP_FAILED) {
perror("Allocating guest commpage");
exit(EXIT_FAILURE);
}
}
/* Set kernel helper versions; rest of page is 0. */
- put_user_u32(5, 0xffff0ffcu);
+ __put_user(5, (uint32_t *)g2h_untagged(0xffff0ffcu));
- if (target_mprotect(addr, qemu_host_page_size, PROT_READ | PROT_EXEC)) {
+ if (mprotect(addr, qemu_host_page_size, PROT_READ)) {
perror("Protecting guest commpage");
exit(EXIT_FAILURE);
}
+
+ page_set_flags(commpage, commpage | ~qemu_host_page_mask,
+ PAGE_READ | PAGE_EXEC | PAGE_VALID);
return true;
}