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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] xen: Fix kexec_crash_area reservation/allocation.
# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Date 1183458280 -3600
# Node ID 0900fb1a3693dc175088f2278ca119aa4c6f3135
# Parent 647f9671dc44cec803d0b9fab9e437d383a0f9b1
xen: Fix kexec_crash_area reservation/allocation.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
xen/arch/x86/setup.c | 124 +++++++++++++++++++++++----------------------------
1 files changed, 56 insertions(+), 68 deletions(-)
diff -r 647f9671dc44 -r 0900fb1a3693 xen/arch/x86/setup.c
--- a/xen/arch/x86/setup.c Tue Jul 03 10:31:13 2007 +0100
+++ b/xen/arch/x86/setup.c Tue Jul 03 11:24:40 2007 +0100
@@ -172,9 +172,10 @@ static unsigned long __initdata initial_
unsigned long __init initial_images_nrpages(void)
{
- unsigned long s = initial_images_start + PAGE_SIZE - 1;
- unsigned long e = initial_images_end;
- return ((e >> PAGE_SHIFT) - (s >> PAGE_SHIFT));
+ ASSERT(!(initial_images_start & ~PAGE_MASK));
+ ASSERT(!(initial_images_end & ~PAGE_MASK));
+ return ((initial_images_end >> PAGE_SHIFT) -
+ (initial_images_start >> PAGE_SHIFT));
}
void __init discard_initial_images(void)
@@ -293,7 +294,7 @@ static struct e820map __initdata boot_e8
static struct e820map __initdata boot_e820;
/* Reserve area (@s,@e) in the temporary bootstrap e820 map. */
-static void __init reserve_in_boot_e820(unsigned long s, unsigned long e)
+static int __init reserve_in_boot_e820(unsigned long s, unsigned long e)
{
uint64_t rs, re;
int i;
@@ -303,23 +304,28 @@ static void __init reserve_in_boot_e820(
/* Have we found the e820 region that includes the specified range? */
rs = boot_e820.map[i].addr;
re = rs + boot_e820.map[i].size;
- if ( (s < rs) || (e > re) )
- continue;
-
- /* Start fragment. */
- boot_e820.map[i].size = s - rs;
-
- /* End fragment. */
- if ( e < re )
- {
- memmove(&boot_e820.map[i+1], &boot_e820.map[i],
- (boot_e820.nr_map-i) * sizeof(boot_e820.map[0]));
- boot_e820.nr_map++;
- i++;
- boot_e820.map[i].addr = e;
- boot_e820.map[i].size = re - e;
- }
- }
+ if ( (s >= rs) && (e <= re) )
+ goto found;
+ }
+
+ return 0;
+
+ found:
+ /* Start fragment. */
+ boot_e820.map[i].size = s - rs;
+
+ /* End fragment. */
+ if ( e < re )
+ {
+ memmove(&boot_e820.map[i+1], &boot_e820.map[i],
+ (boot_e820.nr_map-i) * sizeof(boot_e820.map[0]));
+ boot_e820.nr_map++;
+ i++;
+ boot_e820.map[i].addr = e;
+ boot_e820.map[i].size = re - e;
+ }
+
+ return 1;
}
struct boot_video_info {
@@ -740,11 +746,18 @@ void __init __start_xen(unsigned long mb
/* Is the region suitable for relocating the multiboot modules? */
if ( !initial_images_start && (s < e) && ((e-s) >= modules_length) )
{
- e -= modules_length;
+ initial_images_end = e;
+ e = (e - modules_length) & PAGE_MASK;
initial_images_start = e;
- initial_images_end = initial_images_start + modules_length;
move_memory(initial_images_start,
mod[0].mod_start, mod[mbi->mods_count-1].mod_end);
+ }
+
+ if ( !kexec_crash_area.start && (s < e) &&
+ ((e-s) >= kexec_crash_area.size) )
+ {
+ e = (e - kexec_crash_area.size) & PAGE_MASK;
+ kexec_crash_area.start = e;
}
}
@@ -769,6 +782,26 @@ void __init __start_xen(unsigned long mb
init_boot_pages(xenheap_phys_end, 16<<20); /* Initial seed: 4MB */
#endif
+ if ( kexec_crash_area.size != 0 )
+ {
+ unsigned long kdump_start = kexec_crash_area.start;
+ unsigned long kdump_size = kexec_crash_area.size;
+
+ kdump_size = (kdump_size + PAGE_SIZE - 1) & PAGE_MASK;
+
+ if ( !reserve_in_boot_e820(kdump_start, kdump_size) )
+ {
+ printk("Kdump: DISABLED (failed to reserve %luMB (%lukB) at 0x%lx)"
+ "\n", kdump_size >> 20, kdump_size >> 10, kdump_start);
+ kexec_crash_area.start = kexec_crash_area.size = 0;
+ }
+ else
+ {
+ printk("Kdump: %luMB (%lukB) at 0x%lx\n",
+ kdump_size >> 20, kdump_size >> 10, kdump_start);
+ }
+ }
+
/*
* With the boot allocator now seeded, we can walk every RAM region and
* map it in its entirety (on x86/64, at least) and notify it to the
@@ -795,51 +828,6 @@ void __init __start_xen(unsigned long mb
s >> PAGE_SHIFT, (map_e-s) >> PAGE_SHIFT, PAGE_HYPERVISOR);
init_boot_pages(s, e);
- }
-
- if ( (kexec_crash_area.size > 0) && (kexec_crash_area.start > 0) )
- {
- unsigned long kdump_start, kdump_size, k;
-
- /* Mark images pages as free for now. */
- init_boot_pages(initial_images_start, initial_images_end);
-
- kdump_start = kexec_crash_area.start;
- kdump_size = kexec_crash_area.size;
-
- printk("Kdump: %luMB (%lukB) at 0x%lx\n",
- kdump_size >> 20,
- kdump_size >> 10,
- kdump_start);
-
- if ( (kdump_start & ~PAGE_MASK) || (kdump_size & ~PAGE_MASK) )
- panic("Kdump parameters not page aligned\n");
-
- kdump_start >>= PAGE_SHIFT;
- kdump_size >>= PAGE_SHIFT;
-
- /* Allocate pages for Kdump memory area. */
- if ( !reserve_boot_pages(kdump_start, kdump_size) )
- panic("Unable to reserve Kdump memory\n");
-
- /* Allocate pages for relocated initial images. */
- k = ((initial_images_end - initial_images_start) & ~PAGE_MASK) ? 1 : 0;
- k += (initial_images_end - initial_images_start) >> PAGE_SHIFT;
-
-#if defined(CONFIG_X86_32)
- /* Must allocate within bootstrap 1:1 limits. */
- k = alloc_boot_low_pages(k, 1); /* 0x0 - BOOTSTRAP_DIRECTMAP_END */
-#else
- k = alloc_boot_pages(k, 1);
-#endif
- if ( k == 0 )
- panic("Unable to allocate initial images memory\n");
-
- move_memory(k << PAGE_SHIFT, initial_images_start, initial_images_end);
-
- initial_images_end -= initial_images_start;
- initial_images_start = k << PAGE_SHIFT;
- initial_images_end += initial_images_start;
}
memguard_init();
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