Re: [Xen-devel] [PATCH] xen: Disable RAM-to-RAM copy in hvmemul_rep_movs() when mem_access_emulate_enabled

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 05.05.15 at 12:01, <rcojocaru@xxxxxxxxxxxxxxx> wrote:
> The mem_access client might want to use hvm_emulate_one_no_write(),
> in which case the RAM-to-RAM copy code in hvmemul_rep_movs() would
> lead to an unwanted (and unexpected) write operation.

I don't follow: hvm_emulate_one_no_write() uses
hvm_emulate_ops_no_write, which in turn uses
hvmemul_rep_movs_discard(). What unwanted writes are you
talking about? And if it was needed, why would
hvmemul_rep_stos() not require a similar tweak?

Jan


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