#define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt
+#include <linux/bootmem.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/slab.h>
#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>
#include <xen/hvc-console.h>
#include <xen/swiotlb-xen.h>
#include <xen/balloon.h>
+#ifdef CONFIG_X86
+#include <asm/xen/cpuid.h>
+#endif
#include <asm/xen/hypercall.h>
#include <asm/xen/interface.h>
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;
.query_foreign_access = gnttab_query_foreign_access_v2,
};
+static bool gnttab_need_v2(void)
+{
+#ifdef CONFIG_X86
+ uint32_t base, width;
+
+ if (xen_pv_domain()) {
+ base = xen_cpuid_base();
+ if (cpuid_eax(base) < 5)
+ return false; /* Information not available, use V1. */
+ width = cpuid_ebx(base + 5) &
+ XEN_CPUID_MACHINE_ADDRESS_WIDTH_MASK;
+ return width > 32 + PAGE_SHIFT;
+ }
+#endif
+ return !!(max_possible_pfn >> 32);
+}
+
static void gnttab_request_version(void)
{
- int rc;
+ long rc;
struct gnttab_set_version gsv;
- gsv.version = 1;
+ if (gnttab_need_v2())
+ gsv.version = 2;
+ else
+ gsv.version = 1;
+
+ /* Boot parameter overrides automatic selection. */
+ 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)