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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH RFC 1/2] xen: refactor physical address space compression support into common code
The "pdx compression" functionality will be useful on ARM as well.
Move the code to common code+header and introduce HAS_PDX to control when it is
built. L2_PAGETABLE_SHIFT is x86 specific, so introduce PDX_GROUP_SHIFT to
abstract it out.
ARM has no need for superpage compression (yet?) and lacks SUPERPAGE_SHIFT so
those functions (spage_to_mfn et al) are not moved.
No affect on x86 and no change for ARM (yet).
Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
xen/Rules.mk | 1 +
xen/arch/x86/Rules.mk | 1 +
xen/arch/x86/mm.c | 3 --
xen/arch/x86/setup.c | 10 ----
xen/arch/x86/x86_64/mm.c | 53 --------------------
xen/common/Makefile | 1 +
xen/common/pdx.c | 99 +++++++++++++++++++++++++++++++++++++
xen/include/asm-x86/mm.h | 4 +-
xen/include/asm-x86/page.h | 2 -
xen/include/asm-x86/x86_64/page.h | 25 +---------
xen/include/xen/pdx.h | 47 ++++++++++++++++++
11 files changed, 152 insertions(+), 94 deletions(-)
create mode 100644 xen/common/pdx.c
create mode 100644 xen/include/xen/pdx.h
diff --git a/xen/Rules.mk b/xen/Rules.mk
index b49f3c8..e2f9e36 100644
--- a/xen/Rules.mk
+++ b/xen/Rules.mk
@@ -59,6 +59,7 @@ CFLAGS-$(HAS_PASSTHROUGH) += -DHAS_PASSTHROUGH
CFLAGS-$(HAS_DEVICE_TREE) += -DHAS_DEVICE_TREE
CFLAGS-$(HAS_PCI) += -DHAS_PCI
CFLAGS-$(HAS_IOPORTS) += -DHAS_IOPORTS
+CFLAGS-$(HAS_PDX) += -DHAS_PDX
CFLAGS-$(frame_pointer) += -fno-omit-frame-pointer -DCONFIG_FRAME_POINTER
ifneq ($(max_phys_cpus),)
diff --git a/xen/arch/x86/Rules.mk b/xen/arch/x86/Rules.mk
index 576985e..6775cb5 100644
--- a/xen/arch/x86/Rules.mk
+++ b/xen/arch/x86/Rules.mk
@@ -12,6 +12,7 @@ HAS_NS16550 := y
HAS_EHCI := y
HAS_KEXEC := y
HAS_GDBSX := y
+HAS_PDX := y
xenoprof := y
#
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index d23cb3f..5b3f06f 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -147,9 +147,6 @@ struct domain *dom_xen, *dom_io, *dom_cow;
unsigned long max_page;
unsigned long total_pages;
-unsigned long __read_mostly pdx_group_valid[BITS_TO_LONGS(
- (FRAMETABLE_NR + PDX_GROUP_COUNT - 1) / PDX_GROUP_COUNT)] = { [0] = 1 };
-
bool_t __read_mostly machine_to_phys_mapping_valid = 0;
struct rangeset *__read_mostly mmio_ro_ranges;
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 599cf04..3bdf185 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -393,16 +393,6 @@ static void __init setup_max_pdx(unsigned long top_page)
max_page = pdx_to_pfn(max_pdx - 1) + 1;
}
-void set_pdx_range(unsigned long smfn, unsigned long emfn)
-{
- unsigned long idx, eidx;
-
- idx = pfn_to_pdx(smfn) / PDX_GROUP_COUNT;
- eidx = (pfn_to_pdx(emfn - 1) + PDX_GROUP_COUNT) / PDX_GROUP_COUNT;
- for ( ; idx < eidx; ++idx )
- __set_bit(idx, pdx_group_valid);
-}
-
/* A temporary copy of the e820 map that we can mess with during bootstrap. */
static struct e820map __initdata boot_e820;
diff --git a/xen/arch/x86/x86_64/mm.c b/xen/arch/x86/x86_64/mm.c
index 4937f9a..09817fc 100644
--- a/xen/arch/x86/x86_64/mm.c
+++ b/xen/arch/x86/x86_64/mm.c
@@ -40,15 +40,6 @@
#include <asm/mem_access.h>
#include <public/memory.h>
-/* Parameters for PFN/MADDR compression. */
-unsigned long __read_mostly max_pdx;
-unsigned long __read_mostly pfn_pdx_bottom_mask = ~0UL;
-unsigned long __read_mostly ma_va_bottom_mask = ~0UL;
-unsigned long __read_mostly pfn_top_mask = 0;
-unsigned long __read_mostly ma_top_mask = 0;
-unsigned long __read_mostly pfn_hole_mask = 0;
-unsigned int __read_mostly pfn_pdx_hole_shift = 0;
-
unsigned int __read_mostly m2p_compat_vstart = __HYPERVISOR_COMPAT_VIRT_START;
/* Enough page directories to map into the bottom 1GB. */
@@ -59,14 +50,6 @@ l2_pgentry_t __attribute__ ((__section__
(".bss.page_aligned")))
l2_pgentry_t *compat_idle_pg_table_l2;
-int __mfn_valid(unsigned long mfn)
-{
- return likely(mfn < max_page) &&
- likely(!(mfn & pfn_hole_mask)) &&
- likely(test_bit(pfn_to_pdx(mfn) / PDX_GROUP_COUNT,
- pdx_group_valid));
-}
-
void *do_page_walk(struct vcpu *v, unsigned long addr)
{
unsigned long mfn = pagetable_get_pfn(v->arch.guest_table);
@@ -119,42 +102,6 @@ void *do_page_walk(struct vcpu *v, unsigned long addr)
return map_domain_page(mfn) + (addr & ~PAGE_MASK);
}
-void __init pfn_pdx_hole_setup(unsigned long mask)
-{
- unsigned int i, j, bottom_shift = 0, hole_shift = 0;
-
- /*
- * We skip the first MAX_ORDER bits, as we never want to compress them.
- * This guarantees that page-pointer arithmetic remains valid within
- * contiguous aligned ranges of 2^MAX_ORDER pages. Among others, our
- * buddy allocator relies on this assumption.
- */
- for ( j = MAX_ORDER-1; ; )
- {
- i = find_next_zero_bit(&mask, BITS_PER_LONG, j);
- j = find_next_bit(&mask, BITS_PER_LONG, i);
- if ( j >= BITS_PER_LONG )
- break;
- if ( j - i > hole_shift )
- {
- hole_shift = j - i;
- bottom_shift = i;
- }
- }
- if ( !hole_shift )
- return;
-
- printk(KERN_INFO "PFN compression on bits %u...%u\n",
- bottom_shift, bottom_shift + hole_shift - 1);
-
- pfn_pdx_hole_shift = hole_shift;
- pfn_pdx_bottom_mask = (1UL << bottom_shift) - 1;
- ma_va_bottom_mask = (PAGE_SIZE << bottom_shift) - 1;
- pfn_hole_mask = ((1UL << hole_shift) - 1) << bottom_shift;
- pfn_top_mask = ~(pfn_pdx_bottom_mask | pfn_hole_mask);
- ma_top_mask = pfn_top_mask << PAGE_SHIFT;
-}
-
/*
* Allocate page table pages for m2p table
*/
diff --git a/xen/common/Makefile b/xen/common/Makefile
index 3683ae3..f7d10f0 100644
--- a/xen/common/Makefile
+++ b/xen/common/Makefile
@@ -51,6 +51,7 @@ obj-y += tmem_xen.o
obj-y += radix-tree.o
obj-y += rbtree.o
obj-y += lzo.o
+obj-$(HAS_PDX) += pdx.o
obj-bin-$(CONFIG_X86) += $(foreach n,decompress bunzip2 unxz unlzma unlzo
unlz4 earlycpio,$(n).init.o)
diff --git a/xen/common/pdx.c b/xen/common/pdx.c
new file mode 100644
index 0000000..11349a7
--- /dev/null
+++ b/xen/common/pdx.c
@@ -0,0 +1,99 @@
+/******************************************************************************
+ * Original code extracted from arch/x86/x86_64/mm.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <xen/config.h>
+#include <xen/init.h>
+#include <xen/mm.h>
+#include <xen/bitops.h>
+
+/* Parameters for PFN/MADDR compression. */
+unsigned long __read_mostly max_pdx;
+unsigned long __read_mostly pfn_pdx_bottom_mask = ~0UL;
+unsigned long __read_mostly ma_va_bottom_mask = ~0UL;
+unsigned long __read_mostly pfn_top_mask = 0;
+unsigned long __read_mostly ma_top_mask = 0;
+unsigned long __read_mostly pfn_hole_mask = 0;
+unsigned int __read_mostly pfn_pdx_hole_shift = 0;
+
+unsigned long __read_mostly pdx_group_valid[BITS_TO_LONGS(
+ (FRAMETABLE_NR + PDX_GROUP_COUNT - 1) / PDX_GROUP_COUNT)] = { [0] = 1 };
+
+int __mfn_valid(unsigned long mfn)
+{
+ return likely(mfn < max_page) &&
+ likely(!(mfn & pfn_hole_mask)) &&
+ likely(test_bit(pfn_to_pdx(mfn) / PDX_GROUP_COUNT,
+ pdx_group_valid));
+}
+
+void set_pdx_range(unsigned long smfn, unsigned long emfn)
+{
+ unsigned long idx, eidx;
+
+ idx = pfn_to_pdx(smfn) / PDX_GROUP_COUNT;
+ eidx = (pfn_to_pdx(emfn - 1) + PDX_GROUP_COUNT) / PDX_GROUP_COUNT;
+
+ for ( ; idx < eidx; ++idx )
+ __set_bit(idx, pdx_group_valid);
+}
+
+void __init pfn_pdx_hole_setup(unsigned long mask)
+{
+ unsigned int i, j, bottom_shift = 0, hole_shift = 0;
+
+ /*
+ * We skip the first MAX_ORDER bits, as we never want to compress them.
+ * This guarantees that page-pointer arithmetic remains valid within
+ * contiguous aligned ranges of 2^MAX_ORDER pages. Among others, our
+ * buddy allocator relies on this assumption.
+ */
+ for ( j = MAX_ORDER-1; ; )
+ {
+ i = find_next_zero_bit(&mask, BITS_PER_LONG, j);
+ j = find_next_bit(&mask, BITS_PER_LONG, i);
+ if ( j >= BITS_PER_LONG )
+ break;
+ if ( j - i > hole_shift )
+ {
+ hole_shift = j - i;
+ bottom_shift = i;
+ }
+ }
+ if ( !hole_shift )
+ return;
+
+ printk(KERN_INFO "PFN compression on bits %u...%u\n",
+ bottom_shift, bottom_shift + hole_shift - 1);
+
+ pfn_pdx_hole_shift = hole_shift;
+ pfn_pdx_bottom_mask = (1UL << bottom_shift) - 1;
+ ma_va_bottom_mask = (PAGE_SIZE << bottom_shift) - 1;
+ pfn_hole_mask = ((1UL << hole_shift) - 1) << bottom_shift;
+ pfn_top_mask = ~(pfn_pdx_bottom_mask | pfn_hole_mask);
+ ma_top_mask = pfn_top_mask << PAGE_SHIFT;
+}
+
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/asm-x86/mm.h b/xen/include/asm-x86/mm.h
index d253117..c328ea3 100644
--- a/xen/include/asm-x86/mm.h
+++ b/xen/include/asm-x86/mm.h
@@ -280,9 +280,7 @@ extern unsigned long max_page;
extern unsigned long total_pages;
void init_frametable(void);
-#define PDX_GROUP_COUNT ((1 << L2_PAGETABLE_SHIFT) / \
- (sizeof(*frame_table) & -sizeof(*frame_table)))
-extern unsigned long pdx_group_valid[];
+#define PDX_GROUP_SHIFT L2_PAGETABLE_SHIFT
/* Convert between Xen-heap virtual addresses and page-info structures. */
static inline struct page_info *__virt_to_page(const void *v)
diff --git a/xen/include/asm-x86/page.h b/xen/include/asm-x86/page.h
index ccc268d..9aa780e 100644
--- a/xen/include/asm-x86/page.h
+++ b/xen/include/asm-x86/page.h
@@ -334,8 +334,6 @@ void *alloc_xen_pagetable(void);
void free_xen_pagetable(void *v);
l1_pgentry_t *virt_to_xen_l1e(unsigned long v);
-extern void set_pdx_range(unsigned long smfn, unsigned long emfn);
-
/* Convert between PAT/PCD/PWT embedded in PTE flags and 3-bit cacheattr. */
static inline uint32_t pte_flags_to_cacheattr(uint32_t flags)
{
diff --git a/xen/include/asm-x86/x86_64/page.h
b/xen/include/asm-x86/x86_64/page.h
index 3eee5b5..1d54587 100644
--- a/xen/include/asm-x86/x86_64/page.h
+++ b/xen/include/asm-x86/x86_64/page.h
@@ -35,17 +35,10 @@
#include <xen/config.h>
#include <asm/types.h>
-extern unsigned long xen_virt_end;
+#include <xen/pdx.h>
-extern unsigned long max_pdx;
-extern unsigned long pfn_pdx_bottom_mask, ma_va_bottom_mask;
-extern unsigned int pfn_pdx_hole_shift;
-extern unsigned long pfn_hole_mask;
-extern unsigned long pfn_top_mask, ma_top_mask;
-extern void pfn_pdx_hole_setup(unsigned long);
+extern unsigned long xen_virt_end;
-#define page_to_pdx(pg) ((pg) - frame_table)
-#define pdx_to_page(pdx) (frame_table + (pdx))
#define spage_to_pdx(spg) (((spg) - spage_table)<<(SUPERPAGE_SHIFT-PAGE_SHIFT))
#define pdx_to_spage(pdx) (spage_table + ((pdx)>>(SUPERPAGE_SHIFT-PAGE_SHIFT)))
/*
@@ -57,20 +50,6 @@ extern void pfn_pdx_hole_setup(unsigned long);
#define pdx_to_virt(pdx) ((void *)(DIRECTMAP_VIRT_START + \
((unsigned long)(pdx) << PAGE_SHIFT)))
-extern int __mfn_valid(unsigned long mfn);
-
-static inline unsigned long pfn_to_pdx(unsigned long pfn)
-{
- return (pfn & pfn_pdx_bottom_mask) |
- ((pfn & pfn_top_mask) >> pfn_pdx_hole_shift);
-}
-
-static inline unsigned long pdx_to_pfn(unsigned long pdx)
-{
- return (pdx & pfn_pdx_bottom_mask) |
- ((pdx << pfn_pdx_hole_shift) & pfn_top_mask);
-}
-
static inline unsigned long pfn_to_sdx(unsigned long pfn)
{
return pfn_to_pdx(pfn) >> (SUPERPAGE_SHIFT-PAGE_SHIFT);
diff --git a/xen/include/xen/pdx.h b/xen/include/xen/pdx.h
new file mode 100644
index 0000000..bcda9e6
--- /dev/null
+++ b/xen/include/xen/pdx.h
@@ -0,0 +1,47 @@
+#ifndef __XEN_PDX_H__
+#define __XEN_PDX_H__
+
+#ifdef HAS_PDX
+
+extern unsigned long max_pdx;
+extern unsigned long pfn_pdx_bottom_mask, ma_va_bottom_mask;
+extern unsigned int pfn_pdx_hole_shift;
+extern unsigned long pfn_hole_mask;
+extern unsigned long pfn_top_mask, ma_top_mask;
+
+#define PDX_GROUP_COUNT ((1 << PDX_GROUP_SHIFT) / \
+ (sizeof(*frame_table) & -sizeof(*frame_table)))
+extern unsigned long pdx_group_valid[];
+
+extern void set_pdx_range(unsigned long smfn, unsigned long emfn);
+
+#define page_to_pdx(pg) ((pg) - frame_table)
+#define pdx_to_page(pdx) (frame_table + (pdx))
+
+extern int __mfn_valid(unsigned long mfn);
+
+static inline unsigned long pfn_to_pdx(unsigned long pfn)
+{
+ return (pfn & pfn_pdx_bottom_mask) |
+ ((pfn & pfn_top_mask) >> pfn_pdx_hole_shift);
+}
+
+static inline unsigned long pdx_to_pfn(unsigned long pdx)
+{
+ return (pdx & pfn_pdx_bottom_mask) |
+ ((pdx << pfn_pdx_hole_shift) & pfn_top_mask);
+}
+
+extern void pfn_pdx_hole_setup(unsigned long);
+
+#endif /* HAVE_PDX */
+#endif /* __XEN_PAGING_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--
1.7.10.4
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