On Thu, May 14, 2015 at 11:37:46AM +0100, Peter Maydell wrote: > On 14 May 2015 at 11:31, Andrew Jones <[email protected]> wrote: > > Forgot to (4): switch from setting userspace's mapping to > > device memory to normal, non-cacheable. Using device memory > > caused a problem that Alex Graf found, and Peter Maydell suggested > > using normal, non-cacheable instead. > > Did you check that non-cacheable is definitely the correct > kind of Normal memory attribute we want? (ie not write-through).
I was concerned that write-through wouldn't be sufficient. If the guest writes to its non-cached memory, and QEMU needs to see what it wrote, then won't write-through fail to work? Unless we some how invalidate the cache first? drew
