Chen, Tiejun wrote on 2015-05-04:
> clflush is a light weight but not serializing instruction, so hence
> memory fence is necessary to make sure all load/store visible before flush
> cache line.
>
> Signed-off-by: Tiejun Chen <tiejun.c...@intel.com>
Acked-by: Yang Zhang <yang.z.zh...@intel.com>
> ---
> xen/drivers/passthrough/vtd/x86/vtd.c | 2 ++
> 1 file changed, 2 insertions(+)
> diff --git a/xen/drivers/passthrough/vtd/x86/vtd.c
> b/xen/drivers/passthrough/vtd/x86/vtd.c index 109234e..fd2ff04 100644
> --- a/xen/drivers/passthrough/vtd/x86/vtd.c +++
> b/xen/drivers/passthrough/vtd/x86/vtd.c @@ -56,7 +56,9 @@ unsigned int
> get_cache_line_size(void)
>
> void cacheline_flush(char * addr)
> {
> + mb();
> clflush(addr);
> + mb();
> }
>
> void flush_all_cache()
Best regards,
Yang
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