[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 4/4] xen: select grant interface version
Based on the maximum page number of the host select either grant v1 or grant v2. For testing purposes add a way to specify the grant interface version via a boot parameter. Signed-off-by: Juergen Gross <jgross@xxxxxxxx> --- drivers/xen/grant-table.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c index 573af785c425..c8479cb4c0dc 100644 --- a/drivers/xen/grant-table.c +++ b/drivers/xen/grant-table.c @@ -43,6 +43,7 @@ #include <linux/hardirq.h> #include <linux/workqueue.h> #include <linux/ratelimit.h> +#include <linux/moduleparam.h> #include <xen/xen.h> #include <xen/interface/xen.h> @@ -68,6 +69,8 @@ static int gnttab_free_count; static grant_ref_t gnttab_free_head; static DEFINE_SPINLOCK(gnttab_list_lock); struct grant_frames xen_auto_xlat_grant_frames; +static unsigned int xen_gnttab_version; +module_param_named(version, xen_gnttab_version, uint, 0); static union { struct grant_entry_v1 *v1; @@ -1191,10 +1194,16 @@ static const struct gnttab_ops gnttab_v2_ops = { static void gnttab_request_version(void) { - int rc; + long rc; struct gnttab_set_version gsv; - gsv.version = 1; + rc = HYPERVISOR_memory_op(XENMEM_maximum_ram_page, NULL); + if (rc < 0 || !(rc >> 32)) + gsv.version = 1; + else + gsv.version = 2; + if (xen_gnttab_version >= 1 && xen_gnttab_version <= 2) + gsv.version = xen_gnttab_version; rc = HYPERVISOR_grant_table_op(GNTTABOP_set_version, &gsv, 1); if (rc == 0 && gsv.version == 2) -- 2.12.3 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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