[MODERATED] Re: [PATCH v5 21/27] MDSv5 20

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Fri, Jan 18, 2019 at 04:50:36PM -0800, speck for Andi Kleen wrote:
> From: Andi Kleen <ak@linux.intel.com>
> Subject:  mds: Schedule clear cpu in swiotlb
> 
> Schedule a cpu clear on next kernel exit for swiotlb running
> in interrupt context, since it touches user data with the CPU.
> 
> Signed-off-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Thank you!
> ---
>  kernel/dma/swiotlb.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
> index d6361776dc5c..e11ff1e45a4c 100644
> --- a/kernel/dma/swiotlb.c
> +++ b/kernel/dma/swiotlb.c
> @@ -34,6 +34,7 @@
>  #include <linux/scatterlist.h>
>  #include <linux/mem_encrypt.h>
>  #include <linux/set_memory.h>
> +#include <linux/clearcpu.h>
>  
>  #include <asm/io.h>
>  #include <asm/dma.h>
> @@ -420,6 +421,7 @@ static void swiotlb_bounce(phys_addr_t orig_addr, phys_addr_t tlb_addr,
>  	} else {
>  		memcpy(phys_to_virt(orig_addr), vaddr, size);
>  	}
> +	lazy_clear_cpu_interrupt();
>  }
>  
>  phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
> -- 
> 2.17.2