RE: [Xen-devel] Dom0 crashing on x86_64

[Jerone Young <jyoung5@xxxxxxxxxx>]

Awsome! Patch works...can now do networking in x86-64 domU without
crashing Xen.

On Fri, 2005-07-15 at 16:26 +0800, Li, Xin B wrote:
> This patch fixes x86_64 domU network crashes dom0.
> 
> This bug is caused by the size of netif_tx_request_t/netif_rx_response_t
> on x86_64, which is using 8 byte alignment.  When PACKET is removed by
> changeset 5648, their sizes are changed from 12 to 16, then
> netif_tx_interface_t/netif_rx_interface_t will overflow a page.
> 
> Signed-off-by: Xin Li <xin.b.li@xxxxxxxxx>
> Signed-off-by: Xiaofeng Ling <xiaofeng.lingi@xxxxxxxxx>
> 
> -Xin
> 
> diff -r 1d026c7023d2 xen/include/public/io/netif.h
> --- a/xen/include/public/io/netif.h     Thu Jul 14 23:48:06 2005
> +++ b/xen/include/public/io/netif.h     Fri Jul 15 19:55:23 2005
> @@ -21,11 +21,11 @@
>      s8       status;
>  } netif_tx_response_t;
> 
> -typedef struct {
> +typedef struct netif_rx_request {
>      u16       id;    /* Echoed in response message.        */
>  } netif_rx_request_t;
> 
> -typedef struct {
> +typedef struct netif_rx_response {
>      memory_t addr;   /* Machine address of packet.              */
>      u16      csum_valid:1; /* Protocol checksum is validated?       */
>      u16      id:15;
> @@ -46,8 +46,13 @@
>  #define MASK_NETIF_RX_IDX(_i) ((_i)&(NETIF_RX_RING_SIZE-1))
>  #define MASK_NETIF_TX_IDX(_i) ((_i)&(NETIF_TX_RING_SIZE-1))
> 
> +#ifdef __x86_64__
> +#define NETIF_TX_RING_SIZE 128
> +#define NETIF_RX_RING_SIZE 128
> +#else
>  #define NETIF_TX_RING_SIZE 256
>  #define NETIF_RX_RING_SIZE 256
> +#endif
> 
>  /* This structure must fit in a memory page. */
>  typedef struct netif_tx_interface {
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
> 
-- 
Jerone Young
IBM Linux Technology Center
jyoung5@xxxxxxxxxx
512-838-1157 (T/L: 678-1157)


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