aboutsummaryrefslogtreecommitdiffstats
path: root/arch/x86/xen/setup.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/xen/setup.c')
-rw-r--r--arch/x86/xen/setup.c59
1 files changed, 50 insertions, 9 deletions
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index b096d02d34ac..f96002107691 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -33,6 +33,8 @@
#include "p2m.h"
#include "mmu.h"
+#define GB(x) ((uint64_t)(x) * 1024 * 1024 * 1024)
+
/* Amount of extra memory space we add to the e820 ranges */
struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
@@ -69,6 +71,26 @@ static unsigned long xen_remap_mfn __initdata = INVALID_P2M_ENTRY;
*/
#define EXTRA_MEM_RATIO (10)
+static bool xen_512gb_limit __initdata = IS_ENABLED(CONFIG_XEN_512GB);
+
+static void __init xen_parse_512gb(void)
+{
+ bool val = false;
+ char *arg;
+
+ arg = strstr(xen_start_info->cmd_line, "xen_512gb_limit");
+ if (!arg)
+ return;
+
+ arg = strstr(xen_start_info->cmd_line, "xen_512gb_limit=");
+ if (!arg)
+ val = true;
+ else if (strtobool(arg + strlen("xen_512gb_limit="), &val))
+ return;
+
+ xen_512gb_limit = val;
+}
+
static void __init xen_add_extra_mem(phys_addr_t start, phys_addr_t size)
{
int i;
@@ -503,12 +525,29 @@ void __init xen_remap_memory(void)
pr_info("Remapped %ld page(s)\n", remapped);
}
+static unsigned long __init xen_get_pages_limit(void)
+{
+ unsigned long limit;
+
+#ifdef CONFIG_X86_32
+ limit = GB(64) / PAGE_SIZE;
+#else
+ limit = ~0ul;
+ if (!xen_initial_domain() && xen_512gb_limit)
+ limit = GB(512) / PAGE_SIZE;
+#endif
+ return limit;
+}
+
static unsigned long __init xen_get_max_pages(void)
{
- unsigned long max_pages = MAX_DOMAIN_PAGES;
+ unsigned long max_pages, limit;
domid_t domid = DOMID_SELF;
int ret;
+ limit = xen_get_pages_limit();
+ max_pages = limit;
+
/*
* For the initial domain we use the maximum reservation as
* the maximum page.
@@ -524,7 +563,7 @@ static unsigned long __init xen_get_max_pages(void)
max_pages = ret;
}
- return min(max_pages, MAX_DOMAIN_PAGES);
+ return min(max_pages, limit);
}
static void __init xen_align_and_add_e820_region(phys_addr_t start,
@@ -699,7 +738,7 @@ static void __init xen_reserve_xen_mfnlist(void)
**/
char * __init xen_memory_setup(void)
{
- unsigned long max_pfn = xen_start_info->nr_pages;
+ unsigned long max_pfn;
phys_addr_t mem_end, addr, size, chunk_size;
u32 type;
int rc;
@@ -709,7 +748,9 @@ char * __init xen_memory_setup(void)
int i;
int op;
- max_pfn = min(MAX_DOMAIN_PAGES, max_pfn);
+ xen_parse_512gb();
+ max_pfn = xen_get_pages_limit();
+ max_pfn = min(max_pfn, xen_start_info->nr_pages);
mem_end = PFN_PHYS(max_pfn);
memmap.nr_entries = E820MAX;
@@ -762,12 +803,15 @@ char * __init xen_memory_setup(void)
* is limited to the max size of lowmem, so that it doesn't
* get completely filled.
*
+ * Make sure we have no memory above max_pages, as this area
+ * isn't handled by the p2m management.
+ *
* In principle there could be a problem in lowmem systems if
* the initial memory is also very large with respect to
* lowmem, but we won't try to deal with that here.
*/
- extra_pages = min(EXTRA_MEM_RATIO * min(max_pfn, PFN_DOWN(MAXMEM)),
- extra_pages);
+ extra_pages = min3(EXTRA_MEM_RATIO * min(max_pfn, PFN_DOWN(MAXMEM)),
+ extra_pages, max_pages - max_pfn);
i = 0;
addr = xen_e820_map[0].addr;
size = xen_e820_map[0].size;
@@ -803,9 +847,6 @@ char * __init xen_memory_setup(void)
/*
* Set the rest as identity mapped, in case PCI BARs are
* located here.
- *
- * PFNs above MAX_P2M_PFN are considered identity mapped as
- * well.
*/
set_phys_range_identity(addr / PAGE_SIZE, ~0ul);

Privacy Policy