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[Qemu-devel] [PATCH] watch_mem_write: implement 8-byte accesses
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH] watch_mem_write: implement 8-byte accesses |
Date: |
Tue, 17 Oct 2017 14:17:14 +0200 |
Aligned 8-byte memory writes by a 64-bit target on a 64-bit host should
always turn into atomic 8-byte writes on the host, however a write
write watchpoint would end up tearing the 8-byte write into two 4-byte
writes in access_with_adjusted_size().
Reported-by: Andrew Baumann <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
---
exec.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/exec.c b/exec.c
index b58bc4eff7..db5ae23118 100644
--- a/exec.c
+++ b/exec.c
@@ -2503,6 +2503,9 @@ static MemTxResult watch_mem_read(void *opaque, hwaddr
addr, uint64_t *pdata,
case 4:
data = address_space_ldl(as, addr, attrs, &res);
break;
+ case 8:
+ data = address_space_ldq(as, addr, attrs, &res);
+ break;
default: abort();
}
*pdata = data;
@@ -2528,6 +2531,9 @@ static MemTxResult watch_mem_write(void *opaque, hwaddr
addr,
case 4:
address_space_stl(as, addr, val, attrs, &res);
break;
+ case 8:
+ address_space_stq(as, addr, val, attrs, &res);
+ break;
default: abort();
}
return res;
@@ -2537,6 +2543,16 @@ static const MemoryRegionOps watch_mem_ops = {
.read_with_attrs = watch_mem_read,
.write_with_attrs = watch_mem_write,
.endianness = DEVICE_NATIVE_ENDIAN,
+ .valid = {
+ .min_access_size = 1,
+ .max_access_size = 8,
+ .unaligned = false,
+ },
+ .impl = {
+ .min_access_size = 1,
+ .max_access_size = 8,
+ .unaligned = false,
+ },
};
static MemTxResult flatview_write(FlatView *fv, hwaddr addr, MemTxAttrs attrs,
--
2.14.2
- [Qemu-devel] [PATCH] watch_mem_write: implement 8-byte accesses,
Paolo Bonzini <=