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From 4acff24f747e43c3f9bb0551c7d09114355c7d3a Mon Sep 17 00:00:00 2001
From: Juergen Gross <jgross@suse.com>
Date: Fri, 7 Dec 2018 13:11:40 +0100
Subject: [PATCH 12/20] xen: Get memory map from hypervisor for PVH
Retrieve the memory map from the hypervisor and normalize it to contain
no overlapping entries and to be sorted by address.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Tested-by: Hans van Kranenburg <hans@knorrie.org>
(cherry picked from commit 2b7a21afd319b829941a928f5763e017d1cc2951)
---
grub-core/kern/i386/xen/pvh.c | 94 +++++++++++++++++++++++++++++++++++
1 file changed, 94 insertions(+)
diff --git a/grub-core/kern/i386/xen/pvh.c b/grub-core/kern/i386/xen/pvh.c
index a2554fb1d..2b68ac333 100644
--- a/grub-core/kern/i386/xen/pvh.c
+++ b/grub-core/kern/i386/xen/pvh.c
@@ -24,7 +24,12 @@
#include <grub/i386/io.h>
#include <grub/xen.h>
#include <xen/hvm/start_info.h>
+#include <grub/i386/linux.h>
#include <grub/machine/kernel.h>
+#include <grub/machine/memory.h>
+#include <xen/memory.h>
+
+#define XEN_MEMORY_MAP_SIZE 128
grub_uint64_t grub_rsdp_addr;
@@ -32,6 +37,8 @@ static char hypercall_page[GRUB_XEN_PAGE_SIZE]
__attribute__ ((aligned (GRUB_XEN_PAGE_SIZE)));
static grub_uint32_t xen_cpuid_base;
+static struct grub_e820_mmap_entry map[XEN_MEMORY_MAP_SIZE];
+static unsigned int nr_map_entries;
static void
grub_xen_cons_msg (const char *msg)
@@ -104,11 +111,98 @@ grub_xen_hypercall (grub_uint32_t callno, grub_uint32_t a0,
return res;
}
+static void
+grub_xen_sort_mmap (void)
+{
+ grub_uint64_t from, to;
+ unsigned int i;
+ struct grub_e820_mmap_entry tmp;
+
+ /* Align map entries to page boundaries. */
+ for (i = 0; i < nr_map_entries; i++)
+ {
+ from = map[i].addr;
+ to = from + map[i].len;
+ if (map[i].type == GRUB_MEMORY_AVAILABLE)
+ {
+ from = ALIGN_UP (from, GRUB_XEN_PAGE_SIZE);
+ to = ALIGN_DOWN (to, GRUB_XEN_PAGE_SIZE);
+ }
+ else
+ {
+ from = ALIGN_DOWN (from, GRUB_XEN_PAGE_SIZE);
+ to = ALIGN_UP (to, GRUB_XEN_PAGE_SIZE);
+ }
+ map[i].addr = from;
+ map[i].len = to - from;
+ }
+
+ again:
+ /* Sort entries by start address. */
+ for (i = 1; i < nr_map_entries; i++)
+ {
+ if (map[i].addr >= map[i - 1].addr)
+ continue;
+ tmp = map[i];
+ map[i] = map[i - 1];
+ map[i - 1] = tmp;
+ i = 0;
+ }
+
+ /* Detect overlapping areas. */
+ for (i = 1; i < nr_map_entries; i++)
+ {
+ if (map[i].addr >= map[i - 1].addr + map[i - 1].len)
+ continue;
+ tmp = map[i - 1];
+ map[i - 1].len = map[i].addr - map[i - 1].addr;
+ if (map[i].addr + map[i].len >= tmp.addr + tmp.len)
+ continue;
+ if (nr_map_entries < ARRAY_SIZE (map))
+ {
+ map[nr_map_entries].addr = map[i].addr + map[i].len;
+ map[nr_map_entries].len = tmp.addr + tmp.len - map[nr_map_entries].addr;
+ map[nr_map_entries].type = tmp.type;
+ nr_map_entries++;
+ goto again;
+ }
+ }
+
+ /* Merge adjacent entries. */
+ for (i = 1; i < nr_map_entries; i++)
+ {
+ if (map[i].type == map[i - 1].type &&
+ map[i].addr == map[i - 1].addr + map[i - 1].len)
+ {
+ map[i - 1].len += map[i].len;
+ map[i] = map[nr_map_entries - 1];
+ nr_map_entries--;
+ goto again;
+ }
+ }
+}
+
+static void
+grub_xen_get_mmap (void)
+{
+ struct xen_memory_map memmap;
+
+ memmap.nr_entries = ARRAY_SIZE (map);
+ set_xen_guest_handle (memmap.buffer, map);
+ if (grub_xen_hypercall (__HYPERVISOR_memory_op, XENMEM_memory_map,
+ (grub_uint32_t) (&memmap), 0, 0, 0, 0))
+ grub_xen_panic ("Could not get memory map from Xen!\n");
+ nr_map_entries = memmap.nr_entries;
+
+ grub_xen_sort_mmap ();
+}
+
void
grub_xen_setup_pvh (void)
{
grub_xen_cpuid_base ();
grub_xen_setup_hypercall_page ();
+ grub_xen_get_mmap ();
}
grub_err_t
--
2.21.0
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