Attachment 154963 Details for Bug 240454 – RHEL4 revised patch to fix mem=

[patch] RHEL4 revised patch to fix mem=

linux-2.6.9-xen-fix-mem-parm2.patch (text/plain), 3.57 KB, created by Chris Lalancette on 2007-05-17 23:21:05 UTC

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Creator: Chris Lalancette

Created: 2007-05-17 23:21:05 UTC

Size: 3.57 KB

patch

obsolete

>--- linux-2.6.9/arch/i386/kernel/setup-xen.c.orig
>+++ linux-2.6.9/arch/i386/kernel/setup-xen.c
>@@ -1476,6 +1476,7 @@ void __init setup_arch(char **cmdline_p)
> 	int i, j, k, fpp;
> 	struct physdev_set_iopl set_iopl;
> 	unsigned long max_low_pfn;
>+	unsigned long p2m_pages;
> 
> 	/* Force a quick death if the kernel panics (not domain 0). */
> 	extern int panic_timeout;
>@@ -1592,6 +1593,32 @@ void __init setup_arch(char **cmdline_p)
> 	find_smp_config();
> #endif
> 
>+	p2m_pages = max_pfn;
>+	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);
>+	}
>+	else if (max_pfn > xen_start_info->nr_pages)
>+		p2m_pages = xen_start_info->nr_pages;
>+
> 	/* 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(
>@@ -1600,7 +1627,7 @@ void __init setup_arch(char **cmdline_p)
> 			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));
>+			p2m_pages * sizeof(unsigned long));
> 		free_bootmem(
> 			__pa(xen_start_info->mfn_list),
> 			PFN_PHYS(PFN_UP(xen_start_info->nr_pages *
>--- linux-2.6.9/arch/x86_64/kernel/setup-xen.c.orig
>+++ linux-2.6.9/arch/x86_64/kernel/setup-xen.c
>@@ -822,6 +822,8 @@ void __init setup_arch(char **cmdline_p)
> 	{
> 		int i, j, k, fpp;
> 		unsigned long va;
>+		unsigned long p2m_pages;
>+
> 		/* 'Initial mapping' of initrd must be destroyed. */
> 		for (va = xen_start_info->mod_start;
> 		     va < (xen_start_info->mod_start+xen_start_info->mod_len);
>@@ -829,6 +831,32 @@ void __init setup_arch(char **cmdline_p)
> 			HYPERVISOR_update_va_mapping(va, __pte_ma(0), 0);
> 		}
> 
>+		p2m_pages = end_pfn;
>+		if (xen_start_info->nr_pages > end_pfn) {
>+			/*
>+			 * the end_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 - end_pfn;
>+			
>+			set_xen_guest_handle(reservation.extent_start,
>+					     ((unsigned long *)xen_start_info->mfn_list) + end_pfn);
>+			reservation.nr_extents = difference;
>+			ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation,
>+						   &reservation);
>+			BUG_ON (ret != difference);
>+		}
>+		else if (end_pfn > xen_start_info->nr_pages)
>+			p2m_pages = xen_start_info->nr_pages;
>+
> 		if (!xen_feature(XENFEAT_auto_translated_physmap)) {
> 			/* Make sure we have a large enough P->M table. */
> 			phys_to_machine_mapping = alloc_bootmem(
>@@ -837,7 +865,7 @@ void __init setup_arch(char **cmdline_p)
> 				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));
>+				p2m_pages * sizeof(unsigned long));
> 			free_bootmem(
> 				__pa(xen_start_info->mfn_list),
> 				PFN_PHYS(PFN_UP(xen_start_info->nr_pages *

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Attachments on bug 240454: 154937 | 154963 | 155743