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tcg: Introduce target-specific page data for user-only

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This data can be allocated by page_alloc_target_data() and
released by page_set_flags(start, end, prot | PAGE_RESET).

This data will be used to hold tag memory for AArch64 MTE.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210212184902.1251044-2-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2021-02-12 10:48:32 -08:00 • committed by Peter Maydell
parent 8ba4bca570
commit d9c5858570
4 changed files with 69 additions and 9 deletions
Download patch file Download diff file Expand all files Collapse all files

4
linux-user/mmap.c
View file

@ -599,6 +599,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
}
}
the_end1:
page_flags |= PAGE_RESET;
page_set_flags(start, start + len, page_flags);
the_end:
trace_target_mmap_complete(start);
@ -794,7 +795,8 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
new_addr = h2g(host_addr);
prot = page_get_flags(old_addr);
page_set_flags(old_addr, old_addr + old_size, 0);
page_set_flags(new_addr, new_addr + new_size, prot | PAGE_VALID);
page_set_flags(new_addr, new_addr + new_size,
prot | PAGE_VALID | PAGE_RESET);
}
tb_invalidate_phys_range(new_addr, new_addr + new_size);
mmap_unlock();

4
linux-user/syscall.c
View file

@ -4643,8 +4643,8 @@ static inline abi_ulong do_shmat(CPUArchState *cpu_env,
raddr=h2g((unsigned long)host_raddr);
page_set_flags(raddr, raddr + shm_info.shm_segsz,
PAGE_VALID | PAGE_READ |
((shmflg & SHM_RDONLY)? 0 : PAGE_WRITE));
PAGE_VALID | PAGE_RESET | PAGE_READ |
(shmflg & SHM_RDONLY ? 0 : PAGE_WRITE));
for (i = 0; i < N_SHM_REGIONS; i++) {
if (!shm_regions[i].in_use) {