diff options
| author | Philippe Mathieu-Daudé <philmd@redhat.com> | 2021-12-15 19:24:21 +0100 |
|---|---|---|
| committer | Thomas Huth <thuth@redhat.com> | 2022-03-21 10:10:58 +0100 |
| commit | 3ab6fdc91b72e156da22848f0003ff4225690ced (patch) | |
| tree | 1c4b64109e634469748f7c3839b8c9d57da9af1a /include/exec/memattrs.h | |
| parent | 58e74682baf4e1ad26b064d8c02e5bc99c75c5d9 (diff) | |
softmmu/physmem: Introduce MemTxAttrs::memory field and MEMTX_ACCESS_ERROR
Add the 'memory' bit to the memory attributes to restrict bus
controller accesses to memories.
Introduce flatview_access_allowed() to check bus permission
before running any bus transaction.
Have read/write accessors return MEMTX_ACCESS_ERROR if an access is
restricted.
There is no change for the default case where 'memory' is not set.
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20211215182421.418374-4-philmd@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
[thuth: Replaced MEMTX_BUS_ERROR with MEMTX_ACCESS_ERROR, remove "inline"]
Signed-off-by: Thomas Huth <thuth@redhat.com>
Diffstat (limited to 'include/exec/memattrs.h')
| -rw-r--r-- | include/exec/memattrs.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/exec/memattrs.h b/include/exec/memattrs.h index 95f2d20d55..9fb98bc1ef 100644 --- a/include/exec/memattrs.h +++ b/include/exec/memattrs.h @@ -35,6 +35,14 @@ typedef struct MemTxAttrs { unsigned int secure:1; /* Memory access is usermode (unprivileged) */ unsigned int user:1; + /* + * Bus interconnect and peripherals can access anything (memories, + * devices) by default. By setting the 'memory' bit, bus transaction + * are restricted to "normal" memories (per the AMBA documentation) + * versus devices. Access to devices will be logged and rejected + * (see MEMTX_ACCESS_ERROR). + */ + unsigned int memory:1; /* Requester ID (for MSI for example) */ unsigned int requester_id:16; /* Invert endianness for this page */ @@ -66,6 +74,7 @@ typedef struct MemTxAttrs { #define MEMTX_OK 0 #define MEMTX_ERROR (1U << 0) /* device returned an error */ #define MEMTX_DECODE_ERROR (1U << 1) /* nothing at that address */ +#define MEMTX_ACCESS_ERROR (1U << 2) /* access denied */ typedef uint32_t MemTxResult; #endif |