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authorChristian Krinitsin <mail@krinitsin.com>2025-06-01 21:35:14 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-06-01 21:35:14 +0200
commit3e4c5a6261770bced301b5e74233e7866166ea5b (patch)
tree9379fddaba693ef8a045da06efee8529baa5f6f4 /gitlab/issues_text/target_missing/host_missing/accel_TCG/1503
parente5634e2806195bee44407853c4bf8776f7abfa4f (diff)
downloadqemu-analysis-3e4c5a6261770bced301b5e74233e7866166ea5b.tar.gz
qemu-analysis-3e4c5a6261770bced301b5e74233e7866166ea5b.zip
clean up repository
Diffstat (limited to 'gitlab/issues_text/target_missing/host_missing/accel_TCG/1503')
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-Writing to readonly memory should call cpu_transaction_failed
-Description of problem:
-Currently if a guest writes to ROM memory on a system that doesn't have some other form of memory protection enabled, QEMU will silently ignore the write (https://gitlab.com/qemu-project/qemu/-/blob/master/accel/tcg/cputlb.c#L2432). Instead, it should call cpu_transaction_failed (similar to what happens when a MMIO operation fails in `io_writex` and other places). For CPUs that don't care, it'll continue to be ignored, but for other CPUs the user will get a warning (with `-d guest_errors`) or an exception as appropriate.
-Steps to reproduce:
-N/A
-Additional information:
-The documentation for do_transaction_failed says:
-
-```
-@do_transaction_failed: Callback for handling failed memory transactions
-(ie bus faults or external aborts; not MMU faults)
-```
-
-which seems reasonably well suited for this case. Here's an overview of what different CPUs currently do if do_transaction_failed is called:
-
-alpha_cpu_do_transaction_failed:
-
-* raises a EXCP_MCHK
-
-arm_cpu_do_transaction_failed:
-
-* raises ARMFault_SyncExternal with EXCP_DATA_ABORT
-
-loongarch_cpu_do_transaction_failed:
-
-* raises EXCCODE_ADEM
-
-m68k_cpu_transaction_failed:
-
-* raises EXCP_ACCESS (M68040 only)
-
-mb_cpu_transaction_failed:
-
-* raises EXCP_HW_EXCP with ESR_EC_DATA_BUS
-
-mips_cpu_do_transaction_failed:
-
-* raises EXCP_DBE (data bus error)
-
-riscv_cpu_do_transaction_failed:
-
-* raises RISCV_EXCP_STORE_AMO_ACCESS_FAULT
-
-sparc_cpu_do_transaction_failed:
-
-* raises an MMU fault
-
-xtensa_cpu_do_transaction_failed
-
-* raises LOAD_STORE_PIF_ADDR_ERROR_CAUSE