Re: [Xen-devel] [PATCH v5 16/16] x86/hvm: track large memory mapped accesses by buffer offset

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 30/06/15 14:05, Paul Durrant wrote:
> The code in hvmemul_do_io() that tracks large reads or writes, to avoid
> re-issue of component I/O, is defeated by accesses across a page boundary
> because it uses physical address. The code is also only relevant to memory
> mapped I/O to or from a buffer.
>
> This patch re-factors the code and moves it into hvmemul_phys_mmio_access()
> where it is relevant and tracks using buffer offset rather than address.
> Separate I/O emulations (of which there may be up to three per instruction)
> are distinguished by linear address.
>
> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> Cc: Keir Fraser <keir@xxxxxxx>
> Cc: Jan Beulich <jbeulich@xxxxxxxx>
> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

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