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memattrs: Check the size of MemTxAttrs

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Make sure MemTxAttrs is packed into 8 bytes and does not exceed 8 bytes.

Suggested-by: Philippe Mathieu-Daudà <philmd@linaro.org>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250121151322.171832-3-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Zhao Liu 2025-01-21 23:13:22 +08:00 committed by Paolo Bonzini
parent 5014e33b1e
commit 57f9d9c84a
1 changed files with 2 additions and 0 deletions
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include/exec/memattrs.h
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@ -64,6 +64,8 @@ typedef struct MemTxAttrs {
uint16_t _reserved2; uint16_t _reserved2;
} MemTxAttrs; } MemTxAttrs;
QEMU_BUILD_BUG_ON(sizeof(MemTxAttrs) > 8);
/* Bus masters which don't specify any attributes will get this, /* Bus masters which don't specify any attributes will get this,
* which has all attribute bits clear except the topmost one * which has all attribute bits clear except the topmost one
* (so that we can distinguish "all attributes deliberately clear" * (so that we can distinguish "all attributes deliberately clear"