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1cceedd772
Right now, we only allow for writing to memory regions that allow direct access using memcpy etc; all other writes are simply ignored. This implies that debugging guests will not work as expected when writing to MMIO device regions. Let's extend cpu_memory_rw_debug() to write to more memory regions, including MMIO device regions. Reshuffle the condition in memory_access_is_direct() to make it easier to read and add a comment. While this change implies that debug access can now also write to MMIO devices, we now are also permit ELF image loads and similar users of cpu_memory_rw_debug() to write to MMIO devices; currently we ignore these writes. Peter assumes [1] that there's probably a class of guest images, which will start writing junk (likely zeroes) into device model registers; we previously would silently ignore any such bogus ELF sections. Likely these images are of questionable correctness and this can be ignored. If ever a problem, we could make these cases use address_space_write_rom() instead, which is left unchanged for now. This patch is based on previous work by Stefan Zabka. [1] https://lore.kernel.org/all/CAFEAcA_2CEJKFyjvbwmpt=on=GgMVamQ5hiiVt+zUr6AY3X=Xg@mail.gmail.com/ Resolves: https://gitlab.com/qemu-project/qemu/-/issues/213 Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: David Hildenbrand <david@redhat.com> Link: https://lore.kernel.org/r/20250210084648.33798-8-david@redhat.com Signed-off-by: Peter Xu <peterx@redhat.com> |
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| .. | ||
| abi_ptr.h | ||
| address-spaces.h | ||
| breakpoint.h | ||
| cpu-all.h | ||
| cpu-common.h | ||
| cpu-defs.h | ||
| cpu_ldst.h | ||
| cputlb.h | ||
| exec-all.h | ||
| gdbstub.h | ||
| helper-gen-common.h | ||
| helper-gen.h | ||
| helper-gen.h.inc | ||
| helper-head.h.inc | ||
| helper-info.c.inc | ||
| helper-proto-common.h | ||
| helper-proto.h | ||
| helper-proto.h.inc | ||
| hwaddr.h | ||
| ioport.h | ||
| log.h | ||
| memattrs.h | ||
| memop.h | ||
| memopidx.h | ||
| memory-internal.h | ||
| memory.h | ||
| memory_ldst.h.inc | ||
| memory_ldst_cached.h.inc | ||
| memory_ldst_phys.h.inc | ||
| mmu-access-type.h | ||
| page-protection.h | ||
| page-vary.h | ||
| plugin-gen.h | ||
| poison.h | ||
| ram_addr.h | ||
| ramblock.h | ||
| ramlist.h | ||
| replay-core.h | ||
| target_long.h | ||
| target_page.h | ||
| tb-flush.h | ||
| tlb-common.h | ||
| translation-block.h | ||
| translator.h | ||
| tswap.h | ||
| vaddr.h | ||