[XEN] Kexec / Kdump: Generic code

This patch implements the generic portion of the Kexec / Kdump port to Xen.

Signed-Off-By: Magnus Damm <magnus@valinux.co.jp>
Signed-Off-By: Simon Horman <horms@verge.net.au>

2 files changed, 229 insertions, 0 deletions

diff --git a/patches/linux-2.6.16.33/kexec-generic.patch b/patches/linux-2.6.16.33/kexec-generic.patch
new file mode 100644
index 0000000000..2e01a7aab0
--- /dev/null
+++ b/patches/linux-2.6.16.33/kexec-generic.patch
@@ -0,0 +1,228 @@
+--- 0001/include/linux/kexec.h
++++ work/include/linux/kexec.h
+@@ -31,6 +31,13 @@
+ #error KEXEC_ARCH not defined
+ #endif
+ 
++#ifndef KEXEC_ARCH_HAS_PAGE_MACROS
++#define kexec_page_to_pfn(page)  page_to_pfn(page)
++#define kexec_pfn_to_page(pfn)   pfn_to_page(pfn)
++#define kexec_virt_to_phys(addr) virt_to_phys(addr)
++#define kexec_phys_to_virt(addr) phys_to_virt(addr)
++#endif
++
+ /*
+  * This structure is used to hold the arguments that are used when loading
+  * kernel binaries.
+@@ -91,6 +98,13 @@ struct kimage {
+ extern NORET_TYPE void machine_kexec(struct kimage *image) ATTRIB_NORET;
+ extern int machine_kexec_prepare(struct kimage *image);
+ extern void machine_kexec_cleanup(struct kimage *image);
++#ifdef CONFIG_XEN
++extern int xen_machine_kexec_load(struct kimage *image);
++extern void xen_machine_kexec_unload(struct kimage *image);
++extern NORET_TYPE void xen_machine_kexec(struct kimage *image) ATTRIB_NORET;
++extern void xen_machine_kexec_setup_resources(void);
++extern void xen_machine_kexec_register_resources(struct resource *res);
++#endif
+ extern asmlinkage long sys_kexec_load(unsigned long entry,
+ 					unsigned long nr_segments,
+ 					struct kexec_segment __user *segments,
+--- 0001/kernel/kexec.c
++++ work/kernel/kexec.c
+@@ -403,7 +403,7 @@ static struct page *kimage_alloc_normal_
+ 		pages = kimage_alloc_pages(GFP_KERNEL, order);
+ 		if (!pages)
+ 			break;
+-		pfn   = page_to_pfn(pages);
++		pfn   = kexec_page_to_pfn(pages);
+ 		epfn  = pfn + count;
+ 		addr  = pfn << PAGE_SHIFT;
+ 		eaddr = epfn << PAGE_SHIFT;
+@@ -437,6 +437,7 @@ static struct page *kimage_alloc_normal_
+ 	return pages;
+ }
+ 
++#ifndef CONFIG_XEN
+ static struct page *kimage_alloc_crash_control_pages(struct kimage *image,
+ 						      unsigned int order)
+ {
+@@ -490,7 +491,7 @@ static struct page *kimage_alloc_crash_c
+ 		}
+ 		/* If I don't overlap any segments I have found my hole! */
+ 		if (i == image->nr_segments) {
+-			pages = pfn_to_page(hole_start >> PAGE_SHIFT);
++			pages = kexec_pfn_to_page(hole_start >> PAGE_SHIFT);
+ 			break;
+ 		}
+ 	}
+@@ -517,6 +518,13 @@ struct page *kimage_alloc_control_pages(
+ 
+ 	return pages;
+ }
++#else /* !CONFIG_XEN */
++struct page *kimage_alloc_control_pages(struct kimage *image,
++					 unsigned int order)
++{
++	return kimage_alloc_normal_control_pages(image, order);
++}
++#endif
+ 
+ static int kimage_add_entry(struct kimage *image, kimage_entry_t entry)
+ {
+@@ -532,7 +540,7 @@ static int kimage_add_entry(struct kimag
+ 			return -ENOMEM;
+ 
+ 		ind_page = page_address(page);
+-		*image->entry = virt_to_phys(ind_page) | IND_INDIRECTION;
++		*image->entry = kexec_virt_to_phys(ind_page) | IND_INDIRECTION;
+ 		image->entry = ind_page;
+ 		image->last_entry = ind_page +
+ 				      ((PAGE_SIZE/sizeof(kimage_entry_t)) - 1);
+@@ -593,13 +601,13 @@ static int kimage_terminate(struct kimag
+ #define for_each_kimage_entry(image, ptr, entry) \
+ 	for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE); \
+ 		ptr = (entry & IND_INDIRECTION)? \
+-			phys_to_virt((entry & PAGE_MASK)): ptr +1)
++			kexec_phys_to_virt((entry & PAGE_MASK)): ptr +1)
+ 
+ static void kimage_free_entry(kimage_entry_t entry)
+ {
+ 	struct page *page;
+ 
+-	page = pfn_to_page(entry >> PAGE_SHIFT);
++	page = kexec_pfn_to_page(entry >> PAGE_SHIFT);
+ 	kimage_free_pages(page);
+ }
+ 
+@@ -611,6 +619,10 @@ static void kimage_free(struct kimage *i
+ 	if (!image)
+ 		return;
+ 
++#ifdef CONFIG_XEN
++	xen_machine_kexec_unload(image);
++#endif
++
+ 	kimage_free_extra_pages(image);
+ 	for_each_kimage_entry(image, ptr, entry) {
+ 		if (entry & IND_INDIRECTION) {
+@@ -686,7 +698,7 @@ static struct page *kimage_alloc_page(st
+ 	 * have a match.
+ 	 */
+ 	list_for_each_entry(page, &image->dest_pages, lru) {
+-		addr = page_to_pfn(page) << PAGE_SHIFT;
++		addr = kexec_page_to_pfn(page) << PAGE_SHIFT;
+ 		if (addr == destination) {
+ 			list_del(&page->lru);
+ 			return page;
+@@ -701,12 +713,12 @@ static struct page *kimage_alloc_page(st
+ 		if (!page)
+ 			return NULL;
+ 		/* If the page cannot be used file it away */
+-		if (page_to_pfn(page) >
++		if (kexec_page_to_pfn(page) >
+ 				(KEXEC_SOURCE_MEMORY_LIMIT >> PAGE_SHIFT)) {
+ 			list_add(&page->lru, &image->unuseable_pages);
+ 			continue;
+ 		}
+-		addr = page_to_pfn(page) << PAGE_SHIFT;
++		addr = kexec_page_to_pfn(page) << PAGE_SHIFT;
+ 
+ 		/* If it is the destination page we want use it */
+ 		if (addr == destination)
+@@ -729,7 +741,7 @@ static struct page *kimage_alloc_page(st
+ 			struct page *old_page;
+ 
+ 			old_addr = *old & PAGE_MASK;
+-			old_page = pfn_to_page(old_addr >> PAGE_SHIFT);
++			old_page = kexec_pfn_to_page(old_addr >> PAGE_SHIFT);
+ 			copy_highpage(page, old_page);
+ 			*old = addr | (*old & ~PAGE_MASK);
+ 
+@@ -779,7 +791,7 @@ static int kimage_load_normal_segment(st
+ 			result  = -ENOMEM;
+ 			goto out;
+ 		}
+-		result = kimage_add_page(image, page_to_pfn(page)
++		result = kimage_add_page(image, kexec_page_to_pfn(page)
+ 								<< PAGE_SHIFT);
+ 		if (result < 0)
+ 			goto out;
+@@ -811,6 +823,7 @@ out:
+ 	return result;
+ }
+ 
++#ifndef CONFIG_XEN
+ static int kimage_load_crash_segment(struct kimage *image,
+ 					struct kexec_segment *segment)
+ {
+@@ -833,7 +846,7 @@ static int kimage_load_crash_segment(str
+ 		char *ptr;
+ 		size_t uchunk, mchunk;
+ 
+-		page = pfn_to_page(maddr >> PAGE_SHIFT);
++		page = kexec_pfn_to_page(maddr >> PAGE_SHIFT);
+ 		if (page == 0) {
+ 			result  = -ENOMEM;
+ 			goto out;
+@@ -881,6 +894,13 @@ static int kimage_load_segment(struct ki
+ 
+ 	return result;
+ }
++#else /* CONFIG_XEN */
++static int kimage_load_segment(struct kimage *image,
++				struct kexec_segment *segment)
++{
++	return kimage_load_normal_segment(image, segment);
++}
++#endif
+ 
+ /*
+  * Exec Kernel system call: for obvious reasons only root may call it.
+@@ -991,6 +1011,11 @@ asmlinkage long sys_kexec_load(unsigned 
+ 		if (result)
+ 			goto out;
+ 	}
++#ifdef CONFIG_XEN
++	result = xen_machine_kexec_load(image);
++	if (result)
++		goto out;
++#endif
+ 	/* Install the new kernel, and  Uninstall the old */
+ 	image = xchg(dest_image, image);
+ 
+@@ -1045,7 +1070,6 @@ void crash_kexec(struct pt_regs *regs)
+ 	struct kimage *image;
+ 	int locked;
+ 
+-
+ 	/* Take the kexec_lock here to prevent sys_kexec_load
+ 	 * running on one cpu from replacing the crash kernel
+ 	 * we are using after a panic on a different cpu.
+@@ -1061,7 +1085,11 @@ void crash_kexec(struct pt_regs *regs)
+ 			struct pt_regs fixed_regs;
+ 			crash_setup_regs(&fixed_regs, regs);
+ 			machine_crash_shutdown(&fixed_regs);
++#ifdef CONFIG_XEN
++			xen_machine_kexec(image);
++#else
+ 			machine_kexec(image);
++#endif
+ 		}
+ 		xchg(&kexec_lock, 0);
+ 	}
+--- 0002/kernel/sys.c
++++ work/kernel/sys.c
+@@ -435,8 +435,12 @@ void kernel_kexec(void)
+ 	kernel_restart_prepare(NULL);
+ 	printk(KERN_EMERG "Starting new kernel\n");
+ 	machine_shutdown();
++#ifdef CONFIG_XEN
++	xen_machine_kexec(image);
++#else
+ 	machine_kexec(image);
+ #endif
++#endif
+ }
+ EXPORT_SYMBOL_GPL(kernel_kexec);
+ 
diff --git a/patches/linux-2.6.16.33/series b/patches/linux-2.6.16.33/series
index ef2c35842e..8d3ec1a0df 100644
--- a/patches/linux-2.6.16.33/series
+++ b/patches/linux-2.6.16.33/series
@@ -1,3 +1,4 @@
+kexec-generic.patch
 blktap-aio-16_03_06.patch
 device_bind.patch
 fix-hz-suspend.patch