The kernel abi was changed with
commit d23b77953f5a4fbf94c05157b186aac2a247ae32
Author: Huacai Chen <chenhuacai@kernel.org>
Date: Wed Jan 17 12:43:08 2024 +0800
LoongArch: Change SHMLBA from SZ_64K to PAGE_SIZE
during the v6.8 cycle.
Reviewed-by: Song Gao <gaosong@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This is the only case in which we expect to have no host memory backing
for a guest memory page, because in general linux user processes cannot
map any pages in the top half of the 64-bit address space.
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2170
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
The assertion was never correct, because the alignment is a composite
of the image alignment and SHMLBA. Even if the image alignment didn't
match the image address, an assertion would not be correct -- more
appropriate would be an error message about an ill formed image. But
the image cannot be held to SHMLBA under any circumstances.
Fixes: ee94743034 ("linux-user: completely re-write init_guest_space")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2157
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reported-by: Alexey Sheplyakov <asheplyakov@yandex.ru>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This option controls the host page size. From the mis-usage in
our own testsuite, this is easily confused with guest page size.
The only thing that occurs when changing the host page size is
that stuff breaks, because one cannot actually change the host
page size. Therefore reject all but the no-op setting as part
of the deprecation process.
Reviewed-by: Warner Losh <imp@bsdimp.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Helge Deller <deller@gmx.de>
Message-Id: <20240102015808.132373-27-richard.henderson@linaro.org>
For the cases for which the host mmap succeeds, but does
not yield the desired address, use do_munmap to restore
the reserved_va memory reservation.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
By unprotecting regions, we re-instate writability and
unify regions that have been split, which may reduce
the total number of regions.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Rather than creating new data structures for vma,
rely on the IntervalTree used by walk_memory_regions.
Use PAGE_* constants, per the page table api, rather
than PROT_* constants, per the mmap api.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Use the flags that we've already saved in order to test
accessibility. Use g2h_untagged and compare guest memory
directly instead of copy_from_user.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
We do not need to copy pages from guest memory before writing
them out. Because vmas are contiguous in host memory, we can
write them in one go.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Fixes a bug in which write_note() wrote namesz_rounded
and datasz_rounded bytes, even though name and data
pointers contain only the unrounded number of bytes.
Instead of many small writes, allocate a block to contain all
of the elf headers and all of the notes. Copy the data into the
block piecemeal and the write it to the file as a chunk.
This also avoids the need to lseek forward for alignment.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Verify the size of the corefile vs the rlimit before
opening and creating the core file at all.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Swap the ordering of vma_init and open. This will be necessary
for further changes, and adjusts the error cleanup path. Narrow
the scope of corefile, as the variable can be freed immediately
after use in open().
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
On the off-chance that one of the cleanup functions changes
errno, latch the errno that we want to return beforehand.
Flush errno to 0 upon success, rather than at the beginning.
No need to avoid negation of 0.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Ignoring the fact that g_malloc cannot fail, the structure
is quite small and might as well be allocated locally.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
In fill_note_info, there were unnecessary checks for
success of g_new/g_malloc. But these structures do not
need to be dyamically allocated at all, and can in fact
be statically allocated within the parent structure.
This removes all error paths from fill_note_info, so
change the return type to void.
Change type of signr to match both caller (elf_core_dump)
and callee (fill_prstatus), which both use int for signr.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Do not dump core at all if getrlimit fails; this ensures
that dumpsize is valid throughout the function, not just
for the initial test vs rlim_cur.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
While async processes are rare for linux-user we do use them from time
to time. The most obvious one is tb_flush when we run out of
translation space. We will also need this when we move plugin
vcpu_init to an async task.
Fix nios2 to follow its older, wiser and more stable siblings.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240227144335.1196131-19-alex.bennee@linaro.org>
