On Tue, Jul 17, 2012 at 09:51:34PM +0800, Xiao Guangrong wrote: > No need split mmio read region into 8-bits pieces since we do it in > emulator_read_write_onepage > > Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx> > --- > arch/x86/kvm/emulate.c | 29 ++++++++++++----------------- > 1 files changed, 12 insertions(+), 17 deletions(-) > > diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c > index 97d9a99..2d1916b 100644 > --- a/arch/x86/kvm/emulate.c > +++ b/arch/x86/kvm/emulate.c > @@ -1166,24 +1166,19 @@ static int read_emulated(struct x86_emulate_ctxt *ctxt, > int rc; > struct read_cache *mc = &ctxt->mem_read; > > - while (size) { > - int n = min(size, 8u); > - size -= n; > - if (mc->pos < mc->end) > - goto read_cached; > - > - rc = ctxt->ops->read_emulated(ctxt, addr, mc->data + mc->end, n, > - &ctxt->exception); > - if (rc != X86EMUL_CONTINUE) > - return rc; > - mc->end += n; > + if (mc->pos < mc->end) > + goto read_cached; > > - read_cached: > - memcpy(dest, mc->data + mc->pos, n); > - mc->pos += n; > - dest += n; > - addr += n; > - } > + rc = ctxt->ops->read_emulated(ctxt, addr, mc->data + mc->end, size, > + &ctxt->exception); > + if (rc != X86EMUL_CONTINUE) > + return rc; > + > + mc->end += size; > + > +read_cached: > + memcpy(dest, mc->data + mc->pos, size); What prevents read_emulated(size > 8) call, with mc->pos == (mc->end - 8) now? > + mc->pos += size; > return X86EMUL_CONTINUE; > } -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html