On Monday 17 December 2007, Fabrice Bellard wrote: > Laurent Vivier wrote: > > This patch enhances the "-drive ,cache=off" mode with IDE drive emulation > > by removing the buffer used in the IDE emulation. > > --- > > block.c | 10 +++ > > block.h | 2 > > block_int.h | 1 > > cpu-all.h | 1 > > exec.c | 19 ++++++ > > hw/ide.c | 176 > > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++--- vl.c > > | 1 > > 7 files changed, 204 insertions(+), 6 deletions(-) > > [...] > > Unfortunately it is more complicated to write to the CPU memory. In > particular, specific action should be done when translated code is > present. A consistent API must include something like cpu_page_lock() / > unlock(). Look at cpu_physical_memory_rw() to see the various issues > which must be handled. Moreover, it would be better to add bus specific > APIs (at least for PCI), but I can accept a CPU memory API for now.
In general it may also be unsafe to do async writes directly to guest memory because you break the atomicity of loads/stores. Paul
