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Diffstat (limited to 'tools/libxc/xc_hvm_build.c')
-rw-r--r--tools/libxc/xc_hvm_build.c125
1 files changed, 101 insertions, 24 deletions
diff --git a/tools/libxc/xc_hvm_build.c b/tools/libxc/xc_hvm_build.c
index c460d97e17..f774978977 100644
--- a/tools/libxc/xc_hvm_build.c
+++ b/tools/libxc/xc_hvm_build.c
@@ -19,8 +19,10 @@
#include <xen/libelf/libelf.h>
-#define SUPERPAGE_PFN_SHIFT 9
-#define SUPERPAGE_NR_PFNS (1UL << SUPERPAGE_PFN_SHIFT)
+#define SUPERPAGE_2MB_SHIFT 9
+#define SUPERPAGE_2MB_NR_PFNS (1UL << SUPERPAGE_2MB_SHIFT)
+#define SUPERPAGE_1GB_SHIFT 18
+#define SUPERPAGE_1GB_NR_PFNS (1UL << SUPERPAGE_1GB_SHIFT)
#define SPECIALPAGE_BUFIOREQ 0
#define SPECIALPAGE_XENSTORE 1
@@ -100,6 +102,19 @@ static int loadelfimage(
return rc;
}
+/*
+ * Check whether there exists mmio hole in the specified memory range.
+ * Returns 1 if exists, else returns 0.
+ */
+static int check_mmio_hole(uint64_t start, uint64_t memsize)
+{
+ if ( start + memsize <= HVM_BELOW_4G_MMIO_START ||
+ start >= HVM_BELOW_4G_MMIO_START + HVM_BELOW_4G_MMIO_LENGTH )
+ return 0;
+ else
+ return 1;
+}
+
static int setup_guest(int xc_handle,
uint32_t dom, int memsize, int target,
char *image, unsigned long image_size)
@@ -117,8 +132,9 @@ static int setup_guest(int xc_handle,
uint64_t v_start, v_end;
int rc;
xen_capabilities_info_t caps;
+ unsigned long stat_normal_pages = 0, stat_2mb_pages = 0,
+ stat_1gb_pages = 0;
int pod_mode = 0;
-
/* An HVM guest must be initialised with at least 2MB memory. */
if ( memsize < 2 || target < 2 )
@@ -166,35 +182,40 @@ static int setup_guest(int xc_handle,
/*
* Allocate memory for HVM guest, skipping VGA hole 0xA0000-0xC0000.
- * We allocate pages in batches of no more than 8MB to ensure that
- * we can be preempted and hence dom0 remains responsive.
+ *
+ * We attempt to allocate 1GB pages if possible. It falls back on 2MB
+ * pages if 1GB allocation fails. 4KB pages will be used eventually if
+ * both fail.
+ *
+ * Under 2MB mode, we allocate pages in batches of no more than 8MB to
+ * ensure that we can be preempted and hence dom0 remains responsive.
*/
rc = xc_domain_memory_populate_physmap(
xc_handle, dom, 0xa0, 0, 0, &page_array[0x00]);
cur_pages = 0xc0;
+ stat_normal_pages = 0xc0;
while ( (rc == 0) && (nr_pages > cur_pages) )
{
- /* Clip count to maximum 8MB extent. */
+ /* Clip count to maximum 1GB extent. */
unsigned long count = nr_pages - cur_pages;
- if ( count > 2048 )
- count = 2048;
-
- /* Clip partial superpage extents to superpage boundaries. */
- if ( ((cur_pages & (SUPERPAGE_NR_PFNS-1)) != 0) &&
- (count > (-cur_pages & (SUPERPAGE_NR_PFNS-1))) )
- count = -cur_pages & (SUPERPAGE_NR_PFNS-1); /* clip s.p. tail */
- else if ( ((count & (SUPERPAGE_NR_PFNS-1)) != 0) &&
- (count > SUPERPAGE_NR_PFNS) )
- count &= ~(SUPERPAGE_NR_PFNS - 1); /* clip non-s.p. tail */
-
- /* Attempt to allocate superpage extents. */
- if ( ((count | cur_pages) & (SUPERPAGE_NR_PFNS - 1)) == 0 )
+ unsigned long max_pages = SUPERPAGE_1GB_NR_PFNS;
+
+ if ( count > max_pages )
+ count = max_pages;
+
+ /* Attemp to allocate 1GB super page. Because in each pass we only
+ * allocate at most 1GB, we don't have to clip super page boundaries.
+ */
+ if ( ((count | cur_pages) & (SUPERPAGE_1GB_NR_PFNS - 1)) == 0 &&
+ /* Check if there exists MMIO hole in the 1GB memory range */
+ !check_mmio_hole(cur_pages << PAGE_SHIFT,
+ SUPERPAGE_1GB_NR_PFNS << PAGE_SHIFT) )
{
long done;
- xen_pfn_t sp_extents[count >> SUPERPAGE_PFN_SHIFT];
+ xen_pfn_t sp_extents[count >> SUPERPAGE_1GB_SHIFT];
struct xen_memory_reservation sp_req = {
- .nr_extents = count >> SUPERPAGE_PFN_SHIFT,
- .extent_order = SUPERPAGE_PFN_SHIFT,
+ .nr_extents = count >> SUPERPAGE_1GB_SHIFT,
+ .extent_order = SUPERPAGE_1GB_SHIFT,
.domid = dom
};
@@ -203,11 +224,12 @@ static int setup_guest(int xc_handle,
set_xen_guest_handle(sp_req.extent_start, sp_extents);
for ( i = 0; i < sp_req.nr_extents; i++ )
- sp_extents[i] = page_array[cur_pages+(i<<SUPERPAGE_PFN_SHIFT)];
+ sp_extents[i] = page_array[cur_pages+(i<<SUPERPAGE_1GB_SHIFT)];
done = xc_memory_op(xc_handle, XENMEM_populate_physmap, &sp_req);
if ( done > 0 )
{
- done <<= SUPERPAGE_PFN_SHIFT;
+ stat_1gb_pages += done;
+ done <<= SUPERPAGE_1GB_SHIFT;
if ( pod_mode && target_pages > cur_pages )
{
int d = target_pages - cur_pages;
@@ -218,12 +240,61 @@ static int setup_guest(int xc_handle,
}
}
+ if ( count != 0 )
+ {
+ /* Clip count to maximum 8MB extent. */
+ max_pages = SUPERPAGE_2MB_NR_PFNS * 4;
+ if ( count > max_pages )
+ count = max_pages;
+
+ /* Clip partial superpage extents to superpage boundaries. */
+ if ( ((cur_pages & (SUPERPAGE_2MB_NR_PFNS-1)) != 0) &&
+ (count > (-cur_pages & (SUPERPAGE_2MB_NR_PFNS-1))) )
+ count = -cur_pages & (SUPERPAGE_2MB_NR_PFNS-1);
+ else if ( ((count & (SUPERPAGE_2MB_NR_PFNS-1)) != 0) &&
+ (count > SUPERPAGE_2MB_NR_PFNS) )
+ count &= ~(SUPERPAGE_2MB_NR_PFNS - 1); /* clip non-s.p. tail */
+
+ /* Attempt to allocate superpage extents. */
+ if ( ((count | cur_pages) & (SUPERPAGE_2MB_NR_PFNS - 1)) == 0 )
+ {
+ long done;
+ xen_pfn_t sp_extents[count >> SUPERPAGE_2MB_SHIFT];
+ struct xen_memory_reservation sp_req = {
+ .nr_extents = count >> SUPERPAGE_2MB_SHIFT,
+ .extent_order = SUPERPAGE_2MB_SHIFT,
+ .domid = dom
+ };
+
+ if ( pod_mode )
+ sp_req.mem_flags = XENMEMF_populate_on_demand;
+
+ set_xen_guest_handle(sp_req.extent_start, sp_extents);
+ for ( i = 0; i < sp_req.nr_extents; i++ )
+ sp_extents[i] = page_array[cur_pages+(i<<SUPERPAGE_2MB_SHIFT)];
+ done = xc_memory_op(xc_handle, XENMEM_populate_physmap, &sp_req);
+ if ( done > 0 )
+ {
+ stat_2mb_pages += done;
+ done <<= SUPERPAGE_2MB_SHIFT;
+ if ( pod_mode && target_pages > cur_pages )
+ {
+ int d = target_pages - cur_pages;
+ pod_pages += ( done < d ) ? done : d;
+ }
+ cur_pages += done;
+ count -= done;
+ }
+ }
+ }
+
/* Fall back to 4kB extents. */
if ( count != 0 )
{
rc = xc_domain_memory_populate_physmap(
xc_handle, dom, count, 0, 0, &page_array[cur_pages]);
cur_pages += count;
+ stat_normal_pages += count;
if ( pod_mode )
pod_pages -= count;
}
@@ -241,6 +312,12 @@ static int setup_guest(int xc_handle,
goto error_out;
}
+ IPRINTF("PHYSICAL MEMORY ALLOCATION:\n"
+ " 4KB PAGES: 0x%016lx\n"
+ " 2MB PAGES: 0x%016lx\n"
+ " 1GB PAGES: 0x%016lx\n",
+ stat_normal_pages, stat_2mb_pages, stat_1gb_pages);
+
if ( loadelfimage(&elf, xc_handle, dom, page_array) != 0 )
goto error_out;
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-29 11:06:53 +0000