Acked-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
On Tue, Jun 29, 2010 at 4:31 PM, Jan Beulich <JBeulich@xxxxxxxxxx> wrote:
> There's no need to share writably the t_info pages (Dom0 only wants
> [and needs] to read it)
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
>
> --- 2010-06-15.orig/tools/xenmon/xenbaked.c 2010-06-29 16:55:30.000000000
> +0200
> +++ 2010-06-15/tools/xenmon/xenbaked.c 2010-06-28 10:23:01.000000000 +0200
> @@ -84,7 +84,7 @@ typedef struct settings_st {
> } settings_t;
>
> struct t_struct {
> - struct t_info *t_info; /* Structure with information about individual
> buffers */
> + const struct t_info *t_info; /* Structure with information about
> individual buffers */
> struct t_buf **meta; /* Pointers to trace buffer metadata */
> unsigned char **data; /* Pointers to trace buffer data areas */
> };
> @@ -376,9 +376,8 @@ static struct t_struct *map_tbufs(unsign
> }
>
> /* Map t_info metadata structure */
> - tbufs.t_info = xc_map_foreign_range(xc_handle, DOMID_XEN,
> - tinfo_size, PROT_READ | PROT_WRITE,
> - tbufs_mfn);
> + tbufs.t_info = xc_map_foreign_range(xc_handle, DOMID_XEN, tinfo_size,
> + PROT_READ, tbufs_mfn);
>
> if ( tbufs.t_info == 0 )
> {
> @@ -404,7 +403,8 @@ static struct t_struct *map_tbufs(unsign
> for(i=0; i<num; i++)
> {
>
> - uint32_t *mfn_list = ((uint32_t *)tbufs.t_info) +
> tbufs.t_info->mfn_offset[i];
> + const uint32_t *mfn_list = (const uint32_t *)tbufs.t_info
> + + tbufs.t_info->mfn_offset[i];
> int j;
> xen_pfn_t pfn_list[tbufs.t_info->tbuf_size];
>
> --- 2010-06-15.orig/tools/xentrace/xentrace.c 2010-06-29 16:55:30.000000000
> +0200
> +++ 2010-06-15/tools/xentrace/xentrace.c 2010-06-28 10:23:26.000000000
> +0200
> @@ -63,7 +63,7 @@ typedef struct settings_st {
> } settings_t;
>
> struct t_struct {
> - struct t_info *t_info; /* Structure with information about individual
> buffers */
> + const struct t_info *t_info; /* Structure with information about
> individual buffers */
> struct t_buf **meta; /* Pointers to trace buffer metadata */
> unsigned char **data; /* Pointers to trace buffer data areas */
> };
> @@ -475,9 +475,8 @@ static struct t_struct *map_tbufs(unsign
> int i;
>
> /* Map t_info metadata structure */
> - tbufs.t_info = xc_map_foreign_range(xc_handle, DOMID_XEN,
> - tinfo_size, PROT_READ | PROT_WRITE,
> - tbufs_mfn);
> + tbufs.t_info = xc_map_foreign_range(xc_handle, DOMID_XEN, tinfo_size,
> + PROT_READ, tbufs_mfn);
>
> if ( tbufs.t_info == 0 )
> {
> @@ -503,7 +502,8 @@ static struct t_struct *map_tbufs(unsign
> for(i=0; i<num; i++)
> {
>
> - uint32_t *mfn_list = ((uint32_t *)tbufs.t_info) +
> tbufs.t_info->mfn_offset[i];
> + const uint32_t *mfn_list = (const uint32_t *)tbufs.t_info
> + + tbufs.t_info->mfn_offset[i];
> int j;
> xen_pfn_t pfn_list[tbufs.t_info->tbuf_size];
>
> --- 2010-06-15.orig/xen/common/trace.c 2010-06-28 12:16:05.000000000 +0200
> +++ 2010-06-15/xen/common/trace.c 2010-06-28 11:58:37.000000000 +0200
> @@ -309,7 +309,7 @@ void __init init_trace_bufs(void)
>
> for(i=0; i<T_INFO_PAGES; i++)
> share_xen_page_with_privileged_guests(
> - virt_to_page(t_info) + i, XENSHARE_writable);
> + virt_to_page(t_info) + i, XENSHARE_readonly);
>
> if ( opt_tbuf_size == 0 )
> {
>
>
>
>
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