> -----Original Message----- > From: Xen-devel <xen-devel-boun...@lists.xenproject.org> On Behalf Of Jan > Beulich > Sent: 24 March 2020 12:34 > To: xen-devel@lists.xenproject.org > Cc: Andrew Cooper <andrew.coop...@citrix.com>; Paul Durrant > <paul.durr...@citrix.com>; Wei Liu > <w...@xen.org>; Roger Pau Monne <roger....@citrix.com> > Subject: [Xen-devel] [PATCH v5 05/10] x86emul: support MOVDIR64B insn > > Introduce a new blk() hook, paralleling the rmw() on in certain way, but > being intended for larger data sizes, and hence its HVM intermediate > handling function doesn't fall back to splitting the operation if the > requested virtual address can't be mapped. > > Note that SDM revision 071 doesn't specify exception behavior for > ModRM.mod == 0b11; assuming #UD here. > > Signed-off-by: Jan Beulich <jbeul...@suse.com> > --- > TBD: If we want to avoid depending on correct MTRR settings, > hvmemul_map_linear_addr() may need to gain a parameter to allow > controlling cachability of the produced mapping(s).
Or could we deal with this by adding an optional cache flush into the unmap? > Of course the > function will also need to be made capable of mapping at least > p2m_mmio_direct pages for this and the two ENQCMD insns to be > actually useful. I/O emulation parts LGTM so... Reviewed-by: Paul Durrant <p...@xen.org>
