Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1186441 > unrolled thread

[Patch V6 00/16] xen: support pv-domains larger than 512GB

Back to article view | Back to linux.kernel

Contents

  [Patch V6 00/16] xen: support pv-domains larger than 512GB Juergen Gross <jgross@suse.com> - 2015-07-17 07:00 +0200
    [Patch V6 14/16] xen: move p2m list if conflicting with e820 map Juergen Gross <jgross@suse.com> - 2015-07-17 07:00 +0200
    [Patch V6 05/16] xen: move static e820 map to global scope Juergen Gross <jgross@suse.com> - 2015-07-17 07:00 +0200
    [Patch V6 16/16] xen: remove no longer needed p2m.h Juergen Gross <jgross@suse.com> - 2015-07-17 07:00 +0200
    [Patch V6 08/16] xen: find unused contiguous memory area Juergen Gross <jgross@suse.com> - 2015-07-17 07:00 +0200
    [Patch V6 03/16] xen: don't build mfn tree if tools don't need it Juergen Gross <jgross@suse.com> - 2015-07-17 07:00 +0200

#1186441 — [Patch V6 00/16] xen: support pv-domains larger than 512GB

Support 64 bit pv-domains with more than 512GB of memory.

Following test have been done:
- 64 bit dom0 on 8GB machine
- 64 bit dom0 on 1TB machine (resolving p2m/E820-map conflict)
- 32 bit dom0 on 8GB machine
- 64 bit dom0 on 8GB machine with faked kernel/E820-map conflict
- 64 bit dom0 on 8GB machine with faked pgtable/E820-map conflict
- 64 bit dom0 on 8GB machine with faked initrd/E820-map conflict
- 64 bit dom0 on 8GB machine with faked p2m/E820-map conflict
- 64 bit domU (sizes up to 900GB)
- 32 bit domU

Changes in V6:
- modify patch 13 as suggested by Konrad Wilk: reserve xenstore page if
  mfn is not 0, instead of relying on not being initial domain

Changes in V5:
- support architectures with undefined KERNEL_PAGE_RO in patch 12
- correct memblock_reserve() area of kernel page tables on 32 bit
- add some more comments in patch 1
- some modifications in patch 13 (memblock_reserve for shared_info removed,
  for xenstore only necessary if not dom0)

Changes in V4:
- new patch 13 (add explicit memblock_reserve() calls for special pages)

Changes in V3:
- rename xen_chk_e820_reserved() to xen_is_e820_reserved() as requested by
  David Vrabel
- add __initdata tag to global variables in patch 10
- move initrd conflict checking after reserving p2m memory (patch 11)

Changes in V2:
- some clarifications and better explanations in commit messages 
- add header changes of include/xen/interface/xen.h (patch 01)
- add wmb() when incrementing p2m_generation (patch 02)
- add new patch 03 (don't build mfn tree if tools don't need it)
- add new patch 06 (split counting of extra memory pages from remapping)
- add new patch 07 (check memory area against e820 map)
- replace early_iounmap() with early_memunmap() (patch 07->patch 08)
- rework patch 09 (check for kernel memory conflicting with memory layout)
- rework patch 10 (check pre-allocated page tables for conflict with memory map)
- combine old patches 08 and 11 into patch 11
- add new patch 12 (provide early_memremap_ro to establish read-only mapping)
- rework old patch 12 (if p2m list located in to be remapped region delay
  remapping) to copy p2m list in case of a conflict (now patch 13)
- correct Kconfig dependency (patch 13->14)
- don't limit dom0 to 512GB (patch 13->14)
- modify parameter parsing to work in very early boot (patch 13->14)
- add new patch 15 to do some cleanup
- remove old patch 05 (simplify xen_set_identity_and_remap() by using global
  variables)
- remove old patch 08 (detect pre-allocated memory interfering with e820 map)


Juergen Gross (16):
  xen: sync with xen headers
  xen: save linear p2m list address in shared info structure
  xen: don't build mfn tree if tools don't need it
  xen: eliminate scalability issues from initial mapping setup
  xen: move static e820 map to global scope
  xen: split counting of extra memory pages from remapping
  xen: check memory area against e820 map
  xen: find unused contiguous memory area
  xen: check for kernel memory conflicting with memory layout
  xen: check pre-allocated page tables for conflict with memory map
  xen: check for initrd conflicting with e820 map
  mm: provide early_memremap_ro to establish read-only mapping
  xen: add explicit memblock_reserve() calls for special pages
  xen: move p2m list if conflicting with e820 map
  xen: allow more than 512 GB of RAM for 64 bit pv-domains
  xen: remove no longer needed p2m.h

 Documentation/kernel-parameters.txt  |   7 +
 arch/x86/include/asm/xen/interface.h |  96 +++++++-
 arch/x86/include/asm/xen/page.h      |   8 +-
 arch/x86/xen/Kconfig                 |  20 +-
 arch/x86/xen/enlighten.c             |   4 +-
 arch/x86/xen/mmu.c                   | 399 ++++++++++++++++++++++++++++++---
 arch/x86/xen/p2m.c                   |  43 +++-
 arch/x86/xen/p2m.h                   |  15 --
 arch/x86/xen/setup.c                 | 414 ++++++++++++++++++++++++++---------
 arch/x86/xen/xen-head.S              |   2 +
 arch/x86/xen/xen-ops.h               |   7 +
 include/asm-generic/early_ioremap.h  |   2 +
 include/asm-generic/fixmap.h         |   3 +
 include/xen/interface/xen.h          |  35 +--
 mm/early_ioremap.c                   |  12 +
 15 files changed, 869 insertions(+), 198 deletions(-)
 delete mode 100644 arch/x86/xen/p2m.h

-- 
2.1.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[toc] | [next] | [standalone]

#1186442 — [Patch V6 14/16] xen: move p2m list if conflicting with e820 map

Check whether the hypervisor supplied p2m list is placed at a location
which is conflicting with the target E820 map. If this is the case
relocate it to a new area unused up to now and compliant to the E820
map.

As the p2m list might by huge (up to several GB) and is required to be
mapped virtually, set up a temporary mapping for the copied list.

For pvh domains just delete the p2m related information from start
info instead of reserving the p2m memory, as we don't need it at all.

For 32 bit kernels adjust the memblock_reserve() parameters in order
to cover the page tables only. This requires to memblock_reserve() the
start_info page on it's own.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
---
 arch/x86/xen/mmu.c     | 257 ++++++++++++++++++++++++++++++++++++++++++++-----
 arch/x86/xen/setup.c   |  51 +++++-----
 arch/x86/xen/xen-ops.h |   3 +
 3 files changed, 264 insertions(+), 47 deletions(-)

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index a36e7b4..59ec3c3 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1094,6 +1094,16 @@ static void xen_exit_mmap(struct mm_struct *mm)
 
 static void xen_post_allocator_init(void);
 
+static void __init pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
+{
+	struct mmuext_op op;
+
+	op.cmd = cmd;
+	op.arg1.mfn = pfn_to_mfn(pfn);
+	if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
+		BUG();
+}
+
 #ifdef CONFIG_X86_64
 static void __init xen_cleanhighmap(unsigned long vaddr,
 				    unsigned long vaddr_end)
@@ -1129,10 +1139,12 @@ static void __init xen_free_ro_pages(unsigned long paddr, unsigned long size)
 	memblock_free(paddr, size);
 }
 
-static void __init xen_cleanmfnmap_free_pgtbl(void *pgtbl)
+static void __init xen_cleanmfnmap_free_pgtbl(void *pgtbl, bool unpin)
 {
 	unsigned long pa = __pa(pgtbl) & PHYSICAL_PAGE_MASK;
 
+	if (unpin)
+		pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(pa));
 	ClearPagePinned(virt_to_page(__va(pa)));
 	xen_free_ro_pages(pa, PAGE_SIZE);
 }
@@ -1151,7 +1163,9 @@ static void __init xen_cleanmfnmap(unsigned long vaddr)
 	pmd_t *pmd;
 	pte_t *pte;
 	unsigned int i;
+	bool unpin;
 
+	unpin = (vaddr == 2 * PGDIR_SIZE);
 	set_pgd(pgd, __pgd(0));
 	do {
 		pud = pud_page + pud_index(va);
@@ -1168,22 +1182,24 @@ static void __init xen_cleanmfnmap(unsigned long vaddr)
 				xen_free_ro_pages(pa, PMD_SIZE);
 			} else if (!pmd_none(*pmd)) {
 				pte = pte_offset_kernel(pmd, va);
+				set_pmd(pmd, __pmd(0));
 				for (i = 0; i < PTRS_PER_PTE; ++i) {
 					if (pte_none(pte[i]))
 						break;
 					pa = pte_pfn(pte[i]) << PAGE_SHIFT;
 					xen_free_ro_pages(pa, PAGE_SIZE);
 				}
-				xen_cleanmfnmap_free_pgtbl(pte);
+				xen_cleanmfnmap_free_pgtbl(pte, unpin);
 			}
 			va += PMD_SIZE;
 			if (pmd_index(va))
 				continue;
-			xen_cleanmfnmap_free_pgtbl(pmd);
+			set_pud(pud, __pud(0));
+			xen_cleanmfnmap_free_pgtbl(pmd, unpin);
 		}
 
 	} while (pud_index(va) || pmd_index(va));
-	xen_cleanmfnmap_free_pgtbl(pud_page);
+	xen_cleanmfnmap_free_pgtbl(pud_page, unpin);
 }
 
 static void __init xen_pagetable_p2m_free(void)
@@ -1219,6 +1235,12 @@ static void __init xen_pagetable_p2m_free(void)
 	} else {
 		xen_cleanmfnmap(addr);
 	}
+}
+
+static void __init xen_pagetable_cleanhighmap(void)
+{
+	unsigned long size;
+	unsigned long addr;
 
 	/* At this stage, cleanup_highmap has already cleaned __ka space
 	 * from _brk_limit way up to the max_pfn_mapped (which is the end of
@@ -1251,6 +1273,8 @@ static void __init xen_pagetable_p2m_setup(void)
 
 #ifdef CONFIG_X86_64
 	xen_pagetable_p2m_free();
+
+	xen_pagetable_cleanhighmap();
 #endif
 	/* And revector! Bye bye old array */
 	xen_start_info->mfn_list = (unsigned long)xen_p2m_addr;
@@ -1586,15 +1610,6 @@ static void __init xen_set_pte_init(pte_t *ptep, pte_t pte)
 	native_set_pte(ptep, pte);
 }
 
-static void __init pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
-{
-	struct mmuext_op op;
-	op.cmd = cmd;
-	op.arg1.mfn = pfn_to_mfn(pfn);
-	if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
-		BUG();
-}
-
 /* Early in boot, while setting up the initial pagetable, assume
    everything is pinned. */
 static void __init xen_alloc_pte_init(struct mm_struct *mm, unsigned long pfn)
@@ -2002,11 +2017,189 @@ void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
 	xen_pt_base = PFN_PHYS(pt_base);
 	xen_pt_size = (pt_end - pt_base) * PAGE_SIZE;
 	memblock_reserve(xen_pt_base, xen_pt_size);
-	/* protect xen_start_info */
-	memblock_reserve(__pa(xen_start_info), PAGE_SIZE);
+
 	/* Revector the xen_start_info */
 	xen_start_info = (struct start_info *)__va(__pa(xen_start_info));
 }
+
+/*
+ * Read a value from a physical address.
+ */
+static unsigned long __init xen_read_phys_ulong(phys_addr_t addr)
+{
+	unsigned long *vaddr;
+	unsigned long val;
+
+	vaddr = early_memremap_ro(addr, sizeof(val));
+	val = *vaddr;
+	early_memunmap(vaddr, sizeof(val));
+	return val;
+}
+
+/*
+ * Translate a virtual address to a physical one without relying on mapped
+ * page tables.
+ */
+static phys_addr_t __init xen_early_virt_to_phys(unsigned long vaddr)
+{
+	phys_addr_t pa;
+	pgd_t pgd;
+	pud_t pud;
+	pmd_t pmd;
+	pte_t pte;
+
+	pa = read_cr3();
+	pgd = native_make_pgd(xen_read_phys_ulong(pa + pgd_index(vaddr) *
+						       sizeof(pgd)));
+	if (!pgd_present(pgd))
+		return 0;
+
+	pa = pgd_val(pgd) & PTE_PFN_MASK;
+	pud = native_make_pud(xen_read_phys_ulong(pa + pud_index(vaddr) *
+						       sizeof(pud)));
+	if (!pud_present(pud))
+		return 0;
+	pa = pud_pfn(pud) << PAGE_SHIFT;
+	if (pud_large(pud))
+		return pa + (vaddr & ~PUD_MASK);
+
+	pmd = native_make_pmd(xen_read_phys_ulong(pa + pmd_index(vaddr) *
+						       sizeof(pmd)));
+	if (!pmd_present(pmd))
+		return 0;
+	pa = pmd_pfn(pmd) << PAGE_SHIFT;
+	if (pmd_large(pmd))
+		return pa + (vaddr & ~PMD_MASK);
+
+	pte = native_make_pte(xen_read_phys_ulong(pa + pte_index(vaddr) *
+						       sizeof(pte)));
+	if (!pte_present(pte))
+		return 0;
+	pa = pte_pfn(pte) << PAGE_SHIFT;
+
+	return pa | (vaddr & ~PAGE_MASK);
+}
+
+/*
+ * Find a new area for the hypervisor supplied p2m list and relocate the p2m to
+ * this area.
+ */
+void __init xen_relocate_p2m(void)
+{
+	phys_addr_t size, new_area, pt_phys, pmd_phys, pud_phys;
+	unsigned long p2m_pfn, p2m_pfn_end, n_frames, pfn, pfn_end;
+	int n_pte, n_pt, n_pmd, n_pud, idx_pte, idx_pt, idx_pmd, idx_pud;
+	pte_t *pt;
+	pmd_t *pmd;
+	pud_t *pud;
+	pgd_t *pgd;
+	unsigned long *new_p2m;
+
+	size = PAGE_ALIGN(xen_start_info->nr_pages * sizeof(unsigned long));
+	n_pte = roundup(size, PAGE_SIZE) >> PAGE_SHIFT;
+	n_pt = roundup(size, PMD_SIZE) >> PMD_SHIFT;
+	n_pmd = roundup(size, PUD_SIZE) >> PUD_SHIFT;
+	n_pud = roundup(size, PGDIR_SIZE) >> PGDIR_SHIFT;
+	n_frames = n_pte + n_pt + n_pmd + n_pud;
+
+	new_area = xen_find_free_area(PFN_PHYS(n_frames));
+	if (!new_area) {
+		xen_raw_console_write("Can't find new memory area for p2m needed due to E820 map conflict\n");
+		BUG();
+	}
+
+	/*
+	 * Setup the page tables for addressing the new p2m list.
+	 * We have asked the hypervisor to map the p2m list at the user address
+	 * PUD_SIZE. It may have done so, or it may have used a kernel space
+	 * address depending on the Xen version.
+	 * To avoid any possible virtual address collision, just use
+	 * 2 * PUD_SIZE for the new area.
+	 */
+	pud_phys = new_area;
+	pmd_phys = pud_phys + PFN_PHYS(n_pud);
+	pt_phys = pmd_phys + PFN_PHYS(n_pmd);
+	p2m_pfn = PFN_DOWN(pt_phys) + n_pt;
+
+	pgd = __va(read_cr3());
+	new_p2m = (unsigned long *)(2 * PGDIR_SIZE);
+	for (idx_pud = 0; idx_pud < n_pud; idx_pud++) {
+		pud = early_memremap(pud_phys, PAGE_SIZE);
+		clear_page(pud);
+		for (idx_pmd = 0; idx_pmd < min(n_pmd, PTRS_PER_PUD);
+		     idx_pmd++) {
+			pmd = early_memremap(pmd_phys, PAGE_SIZE);
+			clear_page(pmd);
+			for (idx_pt = 0; idx_pt < min(n_pt, PTRS_PER_PMD);
+			     idx_pt++) {
+				pt = early_memremap(pt_phys, PAGE_SIZE);
+				clear_page(pt);
+				for (idx_pte = 0;
+				     idx_pte < min(n_pte, PTRS_PER_PTE);
+				     idx_pte++) {
+					set_pte(pt + idx_pte,
+						pfn_pte(p2m_pfn, PAGE_KERNEL));
+					p2m_pfn++;
+				}
+				n_pte -= PTRS_PER_PTE;
+				early_memunmap(pt, PAGE_SIZE);
+				make_lowmem_page_readonly(__va(pt_phys));
+				pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE,
+						  PFN_DOWN(pt_phys));
+				set_pmd(pmd + idx_pt,
+					__pmd(_PAGE_TABLE | pt_phys));
+				pt_phys += PAGE_SIZE;
+			}
+			n_pt -= PTRS_PER_PMD;
+			early_memunmap(pmd, PAGE_SIZE);
+			make_lowmem_page_readonly(__va(pmd_phys));
+			pin_pagetable_pfn(MMUEXT_PIN_L2_TABLE,
+					  PFN_DOWN(pmd_phys));
+			set_pud(pud + idx_pmd, __pud(_PAGE_TABLE | pmd_phys));
+			pmd_phys += PAGE_SIZE;
+		}
+		n_pmd -= PTRS_PER_PUD;
+		early_memunmap(pud, PAGE_SIZE);
+		make_lowmem_page_readonly(__va(pud_phys));
+		pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, PFN_DOWN(pud_phys));
+		set_pgd(pgd + 2 + idx_pud, __pgd(_PAGE_TABLE | pud_phys));
+		pud_phys += PAGE_SIZE;
+	}
+
+	/* Now copy the old p2m info to the new area. */
+	memcpy(new_p2m, xen_p2m_addr, size);
+	xen_p2m_addr = new_p2m;
+
+	/* Release the old p2m list and set new list info. */
+	p2m_pfn = PFN_DOWN(xen_early_virt_to_phys(xen_start_info->mfn_list));
+	BUG_ON(!p2m_pfn);
+	p2m_pfn_end = p2m_pfn + PFN_DOWN(size);
+
+	if (xen_start_info->mfn_list < __START_KERNEL_map) {
+		pfn = xen_start_info->first_p2m_pfn;
+		pfn_end = xen_start_info->first_p2m_pfn +
+			  xen_start_info->nr_p2m_frames;
+		set_pgd(pgd + 1, __pgd(0));
+	} else {
+		pfn = p2m_pfn;
+		pfn_end = p2m_pfn_end;
+	}
+
+	memblock_free(PFN_PHYS(pfn), PAGE_SIZE * (pfn_end - pfn));
+	while (pfn < pfn_end) {
+		if (pfn == p2m_pfn) {
+			pfn = p2m_pfn_end;
+			continue;
+		}
+		make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
+		pfn++;
+	}
+
+	xen_start_info->mfn_list = (unsigned long)xen_p2m_addr;
+	xen_start_info->first_p2m_pfn =  PFN_DOWN(new_area);
+	xen_start_info->nr_p2m_frames = n_frames;
+}
+
 #else	/* !CONFIG_X86_64 */
 static RESERVE_BRK_ARRAY(pmd_t, initial_kernel_pmd, PTRS_PER_PMD);
 static RESERVE_BRK_ARRAY(pmd_t, swapper_kernel_pmd, PTRS_PER_PMD);
@@ -2047,18 +2240,41 @@ static void __init xen_write_cr3_init(unsigned long cr3)
 	pv_mmu_ops.write_cr3 = &xen_write_cr3;
 }
 
+/*
+ * For 32 bit domains xen_start_info->pt_base is the pgd address which might be
+ * not the first page table in the page table pool.
+ * Iterate through the initial page tables to find the real page table base.
+ */
+static phys_addr_t xen_find_pt_base(pmd_t *pmd)
+{
+	phys_addr_t pt_base, paddr;
+	unsigned pmdidx;
+
+	pt_base = min(__pa(xen_start_info->pt_base), __pa(pmd));
+
+	for (pmdidx = 0; pmdidx < PTRS_PER_PMD; pmdidx++)
+		if (pmd_present(pmd[pmdidx])) {
+			paddr = m2p(pmd[pmdidx].pmd);
+			pt_base = min(pt_base, paddr);
+		}
+
+	return pt_base;
+}
+
 void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
 {
 	pmd_t *kernel_pmd;
 
+	kernel_pmd = m2v(pgd[KERNEL_PGD_BOUNDARY].pgd);
+
+	xen_pt_base = xen_find_pt_base(kernel_pmd);
+	xen_pt_size = xen_start_info->nr_pt_frames * PAGE_SIZE;
+
 	initial_kernel_pmd =
 		extend_brk(sizeof(pmd_t) * PTRS_PER_PMD, PAGE_SIZE);
 
-	max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->pt_base) +
-				  xen_start_info->nr_pt_frames * PAGE_SIZE +
-				  512*1024);
+	max_pfn_mapped = PFN_DOWN(xen_pt_base + xen_pt_size + 512 * 1024);
 
-	kernel_pmd = m2v(pgd[KERNEL_PGD_BOUNDARY].pgd);
 	copy_page(initial_kernel_pmd, kernel_pmd);
 
 	xen_map_identity_early(initial_kernel_pmd, max_pfn);
@@ -2077,9 +2293,6 @@ void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
 			  PFN_DOWN(__pa(initial_page_table)));
 	xen_write_cr3(__pa(initial_page_table));
 
-	xen_pt_base = __pa(xen_start_info->pt_base);
-	xen_pt_size = xen_start_info->nr_pt_frames * PAGE_SIZE;
-
 	memblock_reserve(xen_pt_base, xen_pt_size);
 }
 #endif	/* CONFIG_X86_64 */
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 0d7f881..b096d02 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -663,37 +663,35 @@ static void __init xen_phys_memcpy(phys_addr_t dest, phys_addr_t src,
 
 /*
  * Reserve Xen mfn_list.
- * See comment above "struct start_info" in <xen/interface/xen.h>
- * We tried to make the the memblock_reserve more selective so
- * that it would be clear what region is reserved. Sadly we ran
- * in the problem wherein on a 64-bit hypervisor with a 32-bit
- * initial domain, the pt_base has the cr3 value which is not
- * neccessarily where the pagetable starts! As Jan put it: "
- * Actually, the adjustment turns out to be correct: The page
- * tables for a 32-on-64 dom0 get allocated in the order "first L1",
- * "first L2", "first L3", so the offset to the page table base is
- * indeed 2. When reading xen/include/public/xen.h's comment
- * very strictly, this is not a violation (since there nothing is said
- * that the first thing in the page table space is pointed to by
- * pt_base; I admit that this seems to be implied though, namely
- * do I think that it is implied that the page table space is the
- * range [pt_base, pt_base + nt_pt_frames), whereas that
- * range here indeed is [pt_base - 2, pt_base - 2 + nt_pt_frames),
- * which - without a priori knowledge - the kernel would have
- * difficulty to figure out)." - so lets just fall back to the
- * easy way and reserve the whole region.
  */
 static void __init xen_reserve_xen_mfnlist(void)
 {
+	phys_addr_t start, size;
+
 	if (xen_start_info->mfn_list >= __START_KERNEL_map) {
-		memblock_reserve(__pa(xen_start_info->mfn_list),
-				 xen_start_info->pt_base -
-				 xen_start_info->mfn_list);
+		start = __pa(xen_start_info->mfn_list);
+		size = PFN_ALIGN(xen_start_info->nr_pages *
+				 sizeof(unsigned long));
+	} else {
+		start = PFN_PHYS(xen_start_info->first_p2m_pfn);
+		size = PFN_PHYS(xen_start_info->nr_p2m_frames);
+	}
+
+	if (!xen_is_e820_reserved(start, size)) {
+		memblock_reserve(start, size);
 		return;
 	}
 
-	memblock_reserve(PFN_PHYS(xen_start_info->first_p2m_pfn),
-			 PFN_PHYS(xen_start_info->nr_p2m_frames));
+#ifdef CONFIG_X86_32
+	/*
+	 * Relocating the p2m on 32 bit system to an arbitrary virtual address
+	 * is not supported, so just give up.
+	 */
+	xen_raw_console_write("Xen hypervisor allocated p2m list conflicts with E820 map\n");
+	BUG();
+#else
+	xen_relocate_p2m();
+#endif
 }
 
 /**
@@ -895,7 +893,10 @@ char * __init xen_auto_xlated_memory_setup(void)
 		e820_add_region(xen_e820_map[i].addr, xen_e820_map[i].size,
 				xen_e820_map[i].type);
 
-	xen_reserve_xen_mfnlist();
+	/* Remove p2m info, it is not needed. */
+	xen_start_info->mfn_list = 0;
+	xen_start_info->first_p2m_pfn = 0;
+	xen_start_info->nr_p2m_frames = 0;
 
 	return "Xen";
 }
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 30c5058..513ac8b1 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -40,6 +40,9 @@ void __init xen_pt_check_e820(void);
 
 void xen_mm_pin_all(void);
 void xen_mm_unpin_all(void);
+#ifdef CONFIG_X86_64
+void __init xen_relocate_p2m(void);
+#endif
 
 bool __init xen_is_e820_reserved(phys_addr_t start, phys_addr_t size);
 unsigned long __ref xen_chk_extra_mem(unsigned long pfn);
-- 
2.1.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[toc] | [prev] | [next] | [standalone]

#1186443 — [Patch V6 05/16] xen: move static e820 map to global scope

Instead of using a function local static e820 map in xen_memory_setup()
and calling various functions in the same source with the map as a
parameter use a map directly accessible by all functions in the source.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
---
 arch/x86/xen/setup.c | 96 +++++++++++++++++++++++++++-------------------------
 1 file changed, 49 insertions(+), 47 deletions(-)

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index adad417..ab6c36e 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -38,6 +38,10 @@ struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
 /* Number of pages released from the initial allocation. */
 unsigned long xen_released_pages;
 
+/* E820 map used during setting up memory. */
+static struct e820entry xen_e820_map[E820MAX] __initdata;
+static u32 xen_e820_map_entries __initdata;
+
 /*
  * Buffer used to remap identity mapped pages. We only need the virtual space.
  * The physical page behind this address is remapped as needed to different
@@ -164,15 +168,13 @@ void __init xen_inv_extra_mem(void)
  * This function updates min_pfn with the pfn found and returns
  * the size of that range or zero if not found.
  */
-static unsigned long __init xen_find_pfn_range(
-	const struct e820entry *list, size_t map_size,
-	unsigned long *min_pfn)
+static unsigned long __init xen_find_pfn_range(unsigned long *min_pfn)
 {
-	const struct e820entry *entry;
+	const struct e820entry *entry = xen_e820_map;
 	unsigned int i;
 	unsigned long done = 0;
 
-	for (i = 0, entry = list; i < map_size; i++, entry++) {
+	for (i = 0; i < xen_e820_map_entries; i++, entry++) {
 		unsigned long s_pfn;
 		unsigned long e_pfn;
 
@@ -356,9 +358,9 @@ static void __init xen_do_set_identity_and_remap_chunk(
  * to Xen and not remapped.
  */
 static unsigned long __init xen_set_identity_and_remap_chunk(
-        const struct e820entry *list, size_t map_size, unsigned long start_pfn,
-	unsigned long end_pfn, unsigned long nr_pages, unsigned long remap_pfn,
-	unsigned long *released, unsigned long *remapped)
+	unsigned long start_pfn, unsigned long end_pfn, unsigned long nr_pages,
+	unsigned long remap_pfn, unsigned long *released,
+	unsigned long *remapped)
 {
 	unsigned long pfn;
 	unsigned long i = 0;
@@ -379,8 +381,7 @@ static unsigned long __init xen_set_identity_and_remap_chunk(
 		if (cur_pfn + size > nr_pages)
 			size = nr_pages - cur_pfn;
 
-		remap_range_size = xen_find_pfn_range(list, map_size,
-						      &remap_pfn);
+		remap_range_size = xen_find_pfn_range(&remap_pfn);
 		if (!remap_range_size) {
 			pr_warning("Unable to find available pfn range, not remapping identity pages\n");
 			xen_set_identity_and_release_chunk(cur_pfn,
@@ -411,13 +412,12 @@ static unsigned long __init xen_set_identity_and_remap_chunk(
 	return remap_pfn;
 }
 
-static void __init xen_set_identity_and_remap(
-	const struct e820entry *list, size_t map_size, unsigned long nr_pages,
-	unsigned long *released, unsigned long *remapped)
+static void __init xen_set_identity_and_remap(unsigned long nr_pages,
+			unsigned long *released, unsigned long *remapped)
 {
 	phys_addr_t start = 0;
 	unsigned long last_pfn = nr_pages;
-	const struct e820entry *entry;
+	const struct e820entry *entry = xen_e820_map;
 	unsigned long num_released = 0;
 	unsigned long num_remapped = 0;
 	int i;
@@ -433,9 +433,9 @@ static void __init xen_set_identity_and_remap(
 	 * example) the DMI tables in a reserved region that begins on
 	 * a non-page boundary.
 	 */
-	for (i = 0, entry = list; i < map_size; i++, entry++) {
+	for (i = 0; i < xen_e820_map_entries; i++, entry++) {
 		phys_addr_t end = entry->addr + entry->size;
-		if (entry->type == E820_RAM || i == map_size - 1) {
+		if (entry->type == E820_RAM || i == xen_e820_map_entries - 1) {
 			unsigned long start_pfn = PFN_DOWN(start);
 			unsigned long end_pfn = PFN_UP(end);
 
@@ -444,9 +444,9 @@ static void __init xen_set_identity_and_remap(
 
 			if (start_pfn < end_pfn)
 				last_pfn = xen_set_identity_and_remap_chunk(
-						list, map_size, start_pfn,
-						end_pfn, nr_pages, last_pfn,
-						&num_released, &num_remapped);
+						start_pfn, end_pfn, nr_pages,
+						last_pfn, &num_released,
+						&num_remapped);
 			start = end;
 		}
 	}
@@ -549,12 +549,12 @@ static void __init xen_align_and_add_e820_region(phys_addr_t start,
 	e820_add_region(start, end - start, type);
 }
 
-static void __init xen_ignore_unusable(struct e820entry *list, size_t map_size)
+static void __init xen_ignore_unusable(void)
 {
-	struct e820entry *entry;
+	struct e820entry *entry = xen_e820_map;
 	unsigned int i;
 
-	for (i = 0, entry = list; i < map_size; i++, entry++) {
+	for (i = 0; i < xen_e820_map_entries; i++, entry++) {
 		if (entry->type == E820_UNUSABLE)
 			entry->type = E820_RAM;
 	}
@@ -600,8 +600,6 @@ static void __init xen_reserve_xen_mfnlist(void)
  **/
 char * __init xen_memory_setup(void)
 {
-	static struct e820entry map[E820MAX] __initdata;
-
 	unsigned long max_pfn = xen_start_info->nr_pages;
 	phys_addr_t mem_end;
 	int rc;
@@ -616,7 +614,7 @@ char * __init xen_memory_setup(void)
 	mem_end = PFN_PHYS(max_pfn);
 
 	memmap.nr_entries = E820MAX;
-	set_xen_guest_handle(memmap.buffer, map);
+	set_xen_guest_handle(memmap.buffer, xen_e820_map);
 
 	op = xen_initial_domain() ?
 		XENMEM_machine_memory_map :
@@ -625,15 +623,16 @@ char * __init xen_memory_setup(void)
 	if (rc == -ENOSYS) {
 		BUG_ON(xen_initial_domain());
 		memmap.nr_entries = 1;
-		map[0].addr = 0ULL;
-		map[0].size = mem_end;
+		xen_e820_map[0].addr = 0ULL;
+		xen_e820_map[0].size = mem_end;
 		/* 8MB slack (to balance backend allocations). */
-		map[0].size += 8ULL << 20;
-		map[0].type = E820_RAM;
+		xen_e820_map[0].size += 8ULL << 20;
+		xen_e820_map[0].type = E820_RAM;
 		rc = 0;
 	}
 	BUG_ON(rc);
 	BUG_ON(memmap.nr_entries == 0);
+	xen_e820_map_entries = memmap.nr_entries;
 
 	/*
 	 * Xen won't allow a 1:1 mapping to be created to UNUSABLE
@@ -644,10 +643,11 @@ char * __init xen_memory_setup(void)
 	 * a patch in the future.
 	 */
 	if (xen_initial_domain())
-		xen_ignore_unusable(map, memmap.nr_entries);
+		xen_ignore_unusable();
 
 	/* Make sure the Xen-supplied memory map is well-ordered. */
-	sanitize_e820_map(map, memmap.nr_entries, &memmap.nr_entries);
+	sanitize_e820_map(xen_e820_map, xen_e820_map_entries,
+			  &xen_e820_map_entries);
 
 	max_pages = xen_get_max_pages();
 	if (max_pages > max_pfn)
@@ -657,8 +657,8 @@ char * __init xen_memory_setup(void)
 	 * Set identity map on non-RAM pages and prepare remapping the
 	 * underlying RAM.
 	 */
-	xen_set_identity_and_remap(map, memmap.nr_entries, max_pfn,
-				   &xen_released_pages, &remapped_pages);
+	xen_set_identity_and_remap(max_pfn, &xen_released_pages,
+				   &remapped_pages);
 
 	extra_pages += xen_released_pages;
 	extra_pages += remapped_pages;
@@ -677,10 +677,10 @@ char * __init xen_memory_setup(void)
 	extra_pages = min(EXTRA_MEM_RATIO * min(max_pfn, PFN_DOWN(MAXMEM)),
 			  extra_pages);
 	i = 0;
-	while (i < memmap.nr_entries) {
-		phys_addr_t addr = map[i].addr;
-		phys_addr_t size = map[i].size;
-		u32 type = map[i].type;
+	while (i < xen_e820_map_entries) {
+		phys_addr_t addr = xen_e820_map[i].addr;
+		phys_addr_t size = xen_e820_map[i].size;
+		u32 type = xen_e820_map[i].type;
 
 		if (type == E820_RAM) {
 			if (addr < mem_end) {
@@ -696,9 +696,9 @@ char * __init xen_memory_setup(void)
 
 		xen_align_and_add_e820_region(addr, size, type);
 
-		map[i].addr += size;
-		map[i].size -= size;
-		if (map[i].size == 0)
+		xen_e820_map[i].addr += size;
+		xen_e820_map[i].size -= size;
+		if (xen_e820_map[i].size == 0)
 			i++;
 	}
 
@@ -709,7 +709,7 @@ char * __init xen_memory_setup(void)
 	 * PFNs above MAX_P2M_PFN are considered identity mapped as
 	 * well.
 	 */
-	set_phys_range_identity(map[i-1].addr / PAGE_SIZE, ~0ul);
+	set_phys_range_identity(xen_e820_map[i - 1].addr / PAGE_SIZE, ~0ul);
 
 	/*
 	 * In domU, the ISA region is normal, usable memory, but we
@@ -731,23 +731,25 @@ char * __init xen_memory_setup(void)
  */
 char * __init xen_auto_xlated_memory_setup(void)
 {
-	static struct e820entry map[E820MAX] __initdata;
-
 	struct xen_memory_map memmap;
 	int i;
 	int rc;
 
 	memmap.nr_entries = E820MAX;
-	set_xen_guest_handle(memmap.buffer, map);
+	set_xen_guest_handle(memmap.buffer, xen_e820_map);
 
 	rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
 	if (rc < 0)
 		panic("No memory map (%d)\n", rc);
 
-	sanitize_e820_map(map, ARRAY_SIZE(map), &memmap.nr_entries);
+	xen_e820_map_entries = memmap.nr_entries;
+
+	sanitize_e820_map(xen_e820_map, ARRAY_SIZE(xen_e820_map),
+			  &xen_e820_map_entries);
 
-	for (i = 0; i < memmap.nr_entries; i++)
-		e820_add_region(map[i].addr, map[i].size, map[i].type);
+	for (i = 0; i < xen_e820_map_entries; i++)
+		e820_add_region(xen_e820_map[i].addr, xen_e820_map[i].size,
+				xen_e820_map[i].type);
 
 	xen_reserve_xen_mfnlist();
 
-- 
2.1.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[toc] | [prev] | [next] | [standalone]

#1186444 — [Patch V6 16/16] xen: remove no longer needed p2m.h

Cleanup by removing arch/x86/xen/p2m.h as it isn't needed any more.

Most definitions in this file are used in p2m.c only. Move those into
p2m.c.

set_phys_range_identity() is already declared in
arch/x86/include/asm/xen/page.h, add __init annotation there.

MAX_REMAP_RANGES isn't used at all, just delete it.

The only define left is P2M_PER_PAGE which is moved to page.h as well.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
---
 arch/x86/include/asm/xen/page.h |  6 ++++--
 arch/x86/xen/p2m.c              |  6 +++++-
 arch/x86/xen/p2m.h              | 15 ---------------
 arch/x86/xen/setup.c            |  1 -
 4 files changed, 9 insertions(+), 19 deletions(-)
 delete mode 100644 arch/x86/xen/p2m.h

diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
index 10ef14b..a3804fb 100644
--- a/arch/x86/include/asm/xen/page.h
+++ b/arch/x86/include/asm/xen/page.h
@@ -35,6 +35,8 @@ typedef struct xpaddr {
 #define FOREIGN_FRAME(m)	((m) | FOREIGN_FRAME_BIT)
 #define IDENTITY_FRAME(m)	((m) | IDENTITY_FRAME_BIT)
 
+#define P2M_PER_PAGE		(PAGE_SIZE / sizeof(unsigned long))
+
 extern unsigned long *machine_to_phys_mapping;
 extern unsigned long  machine_to_phys_nr;
 extern unsigned long *xen_p2m_addr;
@@ -44,8 +46,8 @@ extern unsigned long  xen_max_p2m_pfn;
 extern unsigned long get_phys_to_machine(unsigned long pfn);
 extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn);
 extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
-extern unsigned long set_phys_range_identity(unsigned long pfn_s,
-					     unsigned long pfn_e);
+extern unsigned long __init set_phys_range_identity(unsigned long pfn_s,
+						    unsigned long pfn_e);
 
 extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
 				   struct gnttab_map_grant_ref *kmap_ops,
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index c059ca1c8..bfc08b1 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -79,10 +79,14 @@
 #include <xen/balloon.h>
 #include <xen/grant_table.h>
 
-#include "p2m.h"
 #include "multicalls.h"
 #include "xen-ops.h"
 
+#define P2M_MID_PER_PAGE	(PAGE_SIZE / sizeof(unsigned long *))
+#define P2M_TOP_PER_PAGE	(PAGE_SIZE / sizeof(unsigned long **))
+
+#define MAX_P2M_PFN	(P2M_TOP_PER_PAGE * P2M_MID_PER_PAGE * P2M_PER_PAGE)
+
 #define PMDS_PER_MID_PAGE	(P2M_MID_PER_PAGE / PTRS_PER_PTE)
 
 unsigned long *xen_p2m_addr __read_mostly;
diff --git a/arch/x86/xen/p2m.h b/arch/x86/xen/p2m.h
deleted file mode 100644
index ad8aee2..0000000
--- a/arch/x86/xen/p2m.h
+++ /dev/null
@@ -1,15 +0,0 @@
-#ifndef _XEN_P2M_H
-#define _XEN_P2M_H
-
-#define P2M_PER_PAGE        (PAGE_SIZE / sizeof(unsigned long))
-#define P2M_MID_PER_PAGE    (PAGE_SIZE / sizeof(unsigned long *))
-#define P2M_TOP_PER_PAGE    (PAGE_SIZE / sizeof(unsigned long **))
-
-#define MAX_P2M_PFN         (P2M_TOP_PER_PAGE * P2M_MID_PER_PAGE * P2M_PER_PAGE)
-
-#define MAX_REMAP_RANGES    10
-
-extern unsigned long __init set_phys_range_identity(unsigned long pfn_s,
-                                      unsigned long pfn_e);
-
-#endif  /* _XEN_P2M_H */
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index f960021..a1a77ea 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -30,7 +30,6 @@
 #include <xen/hvc-console.h>
 #include "xen-ops.h"
 #include "vdso.h"
-#include "p2m.h"
 #include "mmu.h"
 
 #define GB(x) ((uint64_t)(x) * 1024 * 1024 * 1024)
-- 
2.1.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[toc] | [prev] | [next] | [standalone]

#1186445 — [Patch V6 08/16] xen: find unused contiguous memory area

For being able to relocate pre-allocated data areas like initrd or
p2m list it is mandatory to find a contiguous memory area which is
not yet in use and doesn't conflict with the memory map we want to
be in effect.

In case such an area is found reserve it at once as this will be
required to be done in any case.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
---
 arch/x86/xen/setup.c   | 34 ++++++++++++++++++++++++++++++++++
 arch/x86/xen/xen-ops.h |  1 +
 2 files changed, 35 insertions(+)

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 99ef82c..973d294 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -597,6 +597,40 @@ bool __init xen_is_e820_reserved(phys_addr_t start, phys_addr_t size)
 }
 
 /*
+ * Find a free area in physical memory not yet reserved and compliant with
+ * E820 map.
+ * Used to relocate pre-allocated areas like initrd or p2m list which are in
+ * conflict with the to be used E820 map.
+ * In case no area is found, return 0. Otherwise return the physical address
+ * of the area which is already reserved for convenience.
+ */
+phys_addr_t __init xen_find_free_area(phys_addr_t size)
+{
+	unsigned mapcnt;
+	phys_addr_t addr, start;
+	struct e820entry *entry = xen_e820_map;
+
+	for (mapcnt = 0; mapcnt < xen_e820_map_entries; mapcnt++, entry++) {
+		if (entry->type != E820_RAM || entry->size < size)
+			continue;
+		start = entry->addr;
+		for (addr = start; addr < start + size; addr += PAGE_SIZE) {
+			if (!memblock_is_reserved(addr))
+				continue;
+			start = addr + PAGE_SIZE;
+			if (start + size > entry->addr + entry->size)
+				break;
+		}
+		if (addr >= start + size) {
+			memblock_reserve(start, size);
+			return start;
+		}
+	}
+
+	return 0;
+}
+
+/*
  * Reserve Xen mfn_list.
  * See comment above "struct start_info" in <xen/interface/xen.h>
  * We tried to make the the memblock_reserve more selective so
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index c3629bd..f189684 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -43,6 +43,7 @@ bool __init xen_is_e820_reserved(phys_addr_t start, phys_addr_t size);
 unsigned long __ref xen_chk_extra_mem(unsigned long pfn);
 void __init xen_inv_extra_mem(void);
 void __init xen_remap_memory(void);
+phys_addr_t __init xen_find_free_area(phys_addr_t size);
 char * __init xen_memory_setup(void);
 char * xen_auto_xlated_memory_setup(void);
 void __init xen_arch_setup(void);
-- 
2.1.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[toc] | [prev] | [next] | [standalone]

#1186446 — [Patch V6 03/16] xen: don't build mfn tree if tools don't need it

In case the Xen tools indicate they don't need the p2m 3 level tree
as they support the virtual mapped linear p2m list, just omit building
the tree.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
---
 arch/x86/xen/p2m.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index b89983e..c719f7c 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -199,7 +199,8 @@ void __ref xen_build_mfn_list_list(void)
 	unsigned int level, topidx, mididx;
 	unsigned long *mid_mfn_p;
 
-	if (xen_feature(XENFEAT_auto_translated_physmap))
+	if (xen_feature(XENFEAT_auto_translated_physmap) ||
+	    xen_start_info->flags & SIF_VIRT_P2M_4TOOLS)
 		return;
 
 	/* Pre-initialize p2m_top_mfn to be completely missing */
@@ -260,8 +261,11 @@ void xen_setup_mfn_list_list(void)
 
 	BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info);
 
-	HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list =
-		virt_to_mfn(p2m_top_mfn);
+	if (xen_start_info->flags & SIF_VIRT_P2M_4TOOLS)
+		HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list = ~0UL;
+	else
+		HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list =
+			virt_to_mfn(p2m_top_mfn);
 	HYPERVISOR_shared_info->arch.max_pfn = xen_max_p2m_pfn;
 	HYPERVISOR_shared_info->arch.p2m_generation = 0;
 	HYPERVISOR_shared_info->arch.p2m_vaddr = (unsigned long)xen_p2m_addr;
-- 
2.1.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[toc] | [prev] | [standalone]

Back to top | Article view | linux.kernel

csiph-web