Attachment 154921 Details for Bug 240429 – Patch to fix mem= kernel parameter

[patch] Patch to fix mem= kernel parameter

linux-2.6.18-xen-i386-fix-mem-parm5.patch (text/plain), 2.98 KB, created by Chris Lalancette on 2007-05-17 14:40:55 UTC

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Creator: Chris Lalancette

Created: 2007-05-17 14:40:55 UTC

Size: 2.98 KB

patch

obsolete

>--- linux-2.6.18.noarch/arch/x86_64/kernel/setup-xen.c.orig	2007-05-17 06:23:15.000000000 -0400
>+++ linux-2.6.18.noarch/arch/x86_64/kernel/setup-xen.c	2007-05-17 06:27:28.000000000 -0400
>@@ -783,6 +783,29 @@
> 	{
> 		int i, j, k, fpp;
> 
>+		if (xen_start_info->nr_pages > max_pfn) {
>+			/*
>+			 * the max_pfn was shrunk (probably by mem= or highmem=
>+			 * kernel parameter); shrink reservation with the HV
>+			 */
>+			struct xen_memory_reservation reservation = {
>+				.address_bits = 0,
>+				.extent_order = 0,
>+				.domid = DOMID_SELF
>+			};
>+			unsigned int difference;
>+			int ret;
>+			
>+			difference = xen_start_info->nr_pages - max_pfn;
>+			
>+			set_xen_guest_handle(reservation.extent_start,
>+					     ((unsigned long *)xen_start_info->mfn_list) + max_pfn);
>+			reservation.nr_extents = difference;
>+			ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation,
>+						   &reservation);
>+			BUG_ON (ret != difference);
>+		}
>+
> 		if (!xen_feature(XENFEAT_auto_translated_physmap)) {
> 			/* Make sure we have a large enough P->M table. */
> 			phys_to_machine_mapping = alloc_bootmem_pages(
>@@ -791,10 +814,10 @@
> 			       end_pfn * sizeof(unsigned long));
> 			memcpy(phys_to_machine_mapping,
> 			       (unsigned long *)xen_start_info->mfn_list,
>-			       xen_start_info->nr_pages * sizeof(unsigned long));
>+			       max_pfn * sizeof(unsigned long));
> 			free_bootmem(
> 				__pa(xen_start_info->mfn_list),
>-				PFN_PHYS(PFN_UP(xen_start_info->nr_pages *
>+				PFN_PHYS(PFN_UP(max_pfn *
> 						sizeof(unsigned long))));
> 
> 			/*
>--- linux-2.6.18.noarch/arch/i386/kernel/setup-xen.c.orig	2007-05-09 08:34:25.000000000 -0400
>+++ linux-2.6.18.noarch/arch/i386/kernel/setup-xen.c	2007-05-17 06:24:49.000000000 -0400
>@@ -1693,6 +1693,29 @@
> 	find_smp_config();
> #endif
> 
>+	if (xen_start_info->nr_pages > max_pfn) {
>+		/*
>+		 * the max_pfn was shrunk (probably by mem= or highmem=
>+		 * kernel parameter); shrink reservation with the HV
>+		 */
>+		struct xen_memory_reservation reservation = {
>+			.address_bits = 0,
>+			.extent_order = 0,
>+			.domid = DOMID_SELF
>+		};
>+		unsigned int difference;
>+		int ret;
>+
>+		difference = xen_start_info->nr_pages - max_pfn;
>+
>+		set_xen_guest_handle(reservation.extent_start,
>+				     ((unsigned long *)xen_start_info->mfn_list) + max_pfn);
>+		reservation.nr_extents = difference;
>+		ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation,
>+					   &reservation);
>+		BUG_ON (ret != difference);
>+	}
>+
> 	/* Make sure we have a correctly sized P->M table. */
> 	if (!xen_feature(XENFEAT_auto_translated_physmap)) {
> 		phys_to_machine_mapping = alloc_bootmem_low_pages(
>@@ -1701,10 +1724,10 @@
> 		       max_pfn * sizeof(unsigned long));
> 		memcpy(phys_to_machine_mapping,
> 		       (unsigned long *)xen_start_info->mfn_list,
>-		       xen_start_info->nr_pages * sizeof(unsigned long));
>+		       max_pfn * sizeof(unsigned long));
> 		free_bootmem(
> 		     __pa(xen_start_info->mfn_list),
>-		     PFN_PHYS(PFN_UP(xen_start_info->nr_pages *
>+		     PFN_PHYS(PFN_UP(max_pfn *
> 				     sizeof(unsigned long))));
> 
> 		/*

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Attachments on bug 240429: 154921 | 154933 | 335116