On 03/28/2011 02:53 AM, Wei Xu wrote:
>> +++ linux/contents/include/linux/kvm.h 2011-03-21 09:16:39.000000000 -0700 >> @@ -152,7 +152,7 @@ >> /* KVM_EXIT_MMIO */ >> struct { >> __u64 phys_addr; >> - __u8 data[8]; >> + __u8 data[16]; >> __u32 len; >> __u8 is_write; >> } mmio; > > This breaks the userspace interface. My implementation split the I/O > into two separate 64-bit writes.Wei>>It will not break the user interface -- the "len" tells user space qemu how many bytes need to be copied; and qemu mmio logic can handle more than 64-bit writes.
But the location of the 'len' field changes. You have to recompile your userspace so the code is aware of the new location.
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