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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [rfc] address space reorganization
Hi,
> I think it would be good to introduce a new constant to indicate the
> start of the hypervisor protected area rather than using RO_MPT_VIRT_END
> everywhere.
Fixed ;)
cheers,
Gerd
==============================[ cut here ]==============================
Subject: [patch] address space reorganization
Shuffle around the memory blocks a bit ;)
Intention is to have largely the same memory layout
in both PAE and non-PAE mode, so I moved the
fixed-size stuff to the top, followed by the
variable-sized stuff (frametable and linear page
tables), and the domain-accessable machine-phys-table
at the bottom.
Note that PAGE_OFFSET isn't the start address of xen's
private memory area any more. Thats why the segment
range checks are fixed up and use the new
HYPERVISOR_VIRT_PRIV_START define which is currently
aliased to RO_MPT_VIRT_END.
Signed-off-by: Gerd Knorr <kraxel@xxxxxxxxxxx>
---
arch/x86/mm.c | 2
arch/x86/traps.c | 4 -
arch/x86/x86_32/mm.c | 6 +-
arch/x86/x86_32/seg_fixup.c | 6 +-
arch/x86/x86_32/xen.lds | 2
include/asm-x86/config.h | 85 ++++++++++++++++++++--------------
include/asm-x86/x86_32/page.h | 2
7 files changed, 61 insertions(+), 46 deletions(-)
Index: xen/arch/x86/x86_32/xen.lds
===================================================================
--- xen.orig/arch/x86/x86_32/xen.lds 2005-04-15 15:31:22.000000000 +0200
+++ xen/arch/x86/x86_32/xen.lds 2005-04-18 20:33:04.000000000 +0200
@@ -11,7 +11,7 @@ PHDRS
}
SECTIONS
{
- . = 0xFC400000 + 0x100000;
+ . = 0xFF000000 + 0x100000;
_text = .; /* Text and read-only data */
.text : {
*(.text)
Index: xen/include/asm-x86/config.h
===================================================================
--- xen.orig/include/asm-x86/config.h 2005-04-15 15:31:22.000000000 +0200
+++ xen/include/asm-x86/config.h 2005-04-19 11:20:58.000000000 +0200
@@ -216,12 +216,56 @@ extern void __out_of_line_bug(int line)
#define asmlinkage __attribute__((regparm(0)))
-#define XENHEAP_DEFAULT_MB (12)
-#define DIRECTMAP_PHYS_END (12*1024*1024)
+#define IOREMAP_VIRT_SIZE 4
+#define DIRECTMAP_VIRT_SIZE 12
+#define MAPCACHE_VIRT_SIZE 4
+#define PERDOMAIN_VIRT_SIZE 4
+
+#ifdef CONFIG_X86_PAE
+# define SH_LINEAR_PT_VIRT_SIZE 8
+# define LINEAR_PT_VIRT_SIZE 8
+# define RDWR_MPT_VIRT_SIZE 4 /* 4 GB mem limit (per domain) */
+# define FRAMETABLE_VIRT_SIZE 96 /* 16 GB mem limit (total) */
+# define RO_MPT_VIRT_SIZE 4 /* 4 GB mem limit (per domain) */
+#else
+# define SH_LINEAR_PT_VIRT_SIZE 4
+# define LINEAR_PT_VIRT_SIZE 4
+# define RDWR_MPT_VIRT_SIZE 4
+# define FRAMETABLE_VIRT_SIZE 24
+# define RO_MPT_VIRT_SIZE 4
+#endif
+#define IOREMAP_VIRT_END 0UL
+#define IOREMAP_VIRT_START (IOREMAP_VIRT_END -
(IOREMAP_VIRT_SIZE*1024*1024))
+#define DIRECTMAP_VIRT_END IOREMAP_VIRT_START
+#define DIRECTMAP_VIRT_START (DIRECTMAP_VIRT_END -
(DIRECTMAP_VIRT_SIZE*1024*1024))
+#define MAPCACHE_VIRT_END DIRECTMAP_VIRT_START
+#define MAPCACHE_VIRT_START (MAPCACHE_VIRT_END -
(MAPCACHE_VIRT_SIZE*1024*1024))
+#define PERDOMAIN_VIRT_END MAPCACHE_VIRT_START
+#define PERDOMAIN_VIRT_START (PERDOMAIN_VIRT_END -
(PERDOMAIN_VIRT_SIZE*1024*1024))
+#define SH_LINEAR_PT_VIRT_END PERDOMAIN_VIRT_START
+#define SH_LINEAR_PT_VIRT_START (SH_LINEAR_PT_VIRT_END -
(SH_LINEAR_PT_VIRT_SIZE*1024*1024))
+#define LINEAR_PT_VIRT_END SH_LINEAR_PT_VIRT_START
+#define LINEAR_PT_VIRT_START (LINEAR_PT_VIRT_END -
(LINEAR_PT_VIRT_SIZE*1024*1024))
+#define RDWR_MPT_VIRT_END LINEAR_PT_VIRT_START
+#define RDWR_MPT_VIRT_START (RDWR_MPT_VIRT_END -
(RDWR_MPT_VIRT_SIZE*1024*1024))
+#define FRAMETABLE_VIRT_END RDWR_MPT_VIRT_START
+#define FRAMETABLE_VIRT_START (FRAMETABLE_VIRT_END -
(FRAMETABLE_VIRT_SIZE*1024*1024))
+#define RO_MPT_VIRT_END FRAMETABLE_VIRT_START
+#define RO_MPT_VIRT_START (RO_MPT_VIRT_END - (RO_MPT_VIRT_SIZE*1024*1024))
+
+#define XENHEAP_DEFAULT_MB (DIRECTMAP_VIRT_SIZE)
+#define DIRECTMAP_PHYS_END (DIRECTMAP_VIRT_SIZE*1024*1024)
+
+#ifdef CONFIG_X86_PAE
+/* Hypervisor owns top 144MB of virtual address space. */
+# define __HYPERVISOR_VIRT_START 0xF7000000
+# define HYPERVISOR_VIRT_START (0xF7000000UL)
+#else
/* Hypervisor owns top 64MB of virtual address space. */
-#define __HYPERVISOR_VIRT_START 0xFC000000
-#define HYPERVISOR_VIRT_START (0xFC000000UL)
+# define __HYPERVISOR_VIRT_START 0xFC000000
+# define HYPERVISOR_VIRT_START (0xFC000000UL)
+#endif
#define ROOT_PAGETABLE_FIRST_XEN_SLOT \
(HYPERVISOR_VIRT_START >> L2_PAGETABLE_SHIFT)
@@ -230,37 +274,6 @@ extern void __out_of_line_bug(int line)
#define ROOT_PAGETABLE_XEN_SLOTS \
(ROOT_PAGETABLE_LAST_XEN_SLOT - ROOT_PAGETABLE_FIRST_XEN_SLOT + 1)
-/*
- * First 4MB are mapped read-only for all. It's for the machine->physical
- * mapping table (MPT table). The following are virtual addresses.
- */
-#define RO_MPT_VIRT_START (HYPERVISOR_VIRT_START)
-#define RO_MPT_VIRT_END (RO_MPT_VIRT_START + (4*1024*1024))
-/* Xen heap extends to end of 1:1 direct-mapped memory region. */
-#define DIRECTMAP_VIRT_START (RO_MPT_VIRT_END)
-#define DIRECTMAP_VIRT_END (DIRECTMAP_VIRT_START + DIRECTMAP_PHYS_END)
-/* Machine-to-phys conversion table. */
-#define RDWR_MPT_VIRT_START (DIRECTMAP_VIRT_END)
-#define RDWR_MPT_VIRT_END (RDWR_MPT_VIRT_START + (4*1024*1024))
-/* Variable-length page-frame information array. */
-#define FRAMETABLE_VIRT_START (RDWR_MPT_VIRT_END)
-#define FRAMETABLE_VIRT_END (FRAMETABLE_VIRT_START + (24*1024*1024))
-/* Next 4MB of virtual address space is used as a linear p.t. mapping. */
-#define LINEAR_PT_VIRT_START (FRAMETABLE_VIRT_END)
-#define LINEAR_PT_VIRT_END (LINEAR_PT_VIRT_START + (4*1024*1024))
-/* Next 4MB of virtual address space is used as a shadow linear p.t. map. */
-#define SH_LINEAR_PT_VIRT_START (LINEAR_PT_VIRT_END)
-#define SH_LINEAR_PT_VIRT_END (SH_LINEAR_PT_VIRT_START + (4*1024*1024))
-/* Next 4MB of virtual address space used for per-domain mappings (eg. GDT). */
-#define PERDOMAIN_VIRT_START (SH_LINEAR_PT_VIRT_END)
-#define PERDOMAIN_VIRT_END (PERDOMAIN_VIRT_START + (4*1024*1024))
-/* Penultimate 4MB of virtual address space used for domain page mappings. */
-#define MAPCACHE_VIRT_START (PERDOMAIN_VIRT_END)
-#define MAPCACHE_VIRT_END (MAPCACHE_VIRT_START + (4*1024*1024))
-/* Final 4MB of virtual address space used for ioremap(). */
-#define IOREMAP_VIRT_START (MAPCACHE_VIRT_END)
-#define IOREMAP_VIRT_END (IOREMAP_VIRT_START + (4*1024*1024))
-
#define PGT_base_page_table PGT_l2_page_table
#define __HYPERVISOR_CS 0x0808
@@ -278,6 +291,8 @@ extern void __out_of_line_bug(int line)
extern unsigned long xenheap_phys_end; /* user-configurable */
#endif
+#define HYPERVISOR_VIRT_PRIV_START RO_MPT_VIRT_END
+
#define GDT_VIRT_START(ed) (PERDOMAIN_VIRT_START + ((ed)->eid <<
PDPT_VCPU_VA_SHIFT))
#define GDT_VIRT_END(ed) (GDT_VIRT_START(ed) + (64*1024))
#define LDT_VIRT_START(ed) (PERDOMAIN_VIRT_START + (64*1024) + ((ed)->eid
<< PDPT_VCPU_VA_SHIFT))
Index: xen/include/asm-x86/x86_32/page.h
===================================================================
--- xen.orig/include/asm-x86/x86_32/page.h 2005-04-18 20:33:03.000000000
+0200
+++ xen/include/asm-x86/x86_32/page.h 2005-04-19 11:09:37.000000000 +0200
@@ -12,7 +12,7 @@
#define L2_PAGETABLE_ENTRIES (1<<PAGETABLE_ORDER)
#define ROOT_PAGETABLE_ENTRIES L2_PAGETABLE_ENTRIES
-#define __PAGE_OFFSET (0xFC400000)
+#define __PAGE_OFFSET (0xFF000000)
#define PADDR_BITS 32
#define VADDR_BITS 32
Index: xen/arch/x86/mm.c
===================================================================
--- xen.orig/arch/x86/mm.c 2005-04-18 20:33:03.000000000 +0200
+++ xen/arch/x86/mm.c 2005-04-19 11:12:54.000000000 +0200
@@ -1634,7 +1634,7 @@ int do_mmuext_op(
if ( ((ptr & (PAGE_SIZE-1)) != 0) ||
(ents > 8192) ||
((ptr+ents*LDT_ENTRY_SIZE) < ptr) ||
- ((ptr+ents*LDT_ENTRY_SIZE) > PAGE_OFFSET) )
+ ((ptr+ents*LDT_ENTRY_SIZE) > HYPERVISOR_VIRT_PRIV_START) )
{
okay = 0;
MEM_LOG("Bad args to SET_LDT: ptr=%p, ents=%p", ptr, ents);
Index: xen/arch/x86/x86_32/seg_fixup.c
===================================================================
--- xen.orig/arch/x86/x86_32/seg_fixup.c 2005-04-15 15:31:22.000000000
+0200
+++ xen/arch/x86/x86_32/seg_fixup.c 2005-04-19 11:15:32.000000000 +0200
@@ -145,7 +145,7 @@ int get_baselimit(u16 seg, unsigned long
* Anything that looks like a truncated segment we assume ought really
* to be a 4GB segment. DANGER!
*/
- if ( (PAGE_OFFSET - (*base + *limit)) < PAGE_SIZE )
+ if ( (HYPERVISOR_VIRT_PRIV_START - (*base + *limit)) < PAGE_SIZE )
*limit = 0;
return 1;
@@ -226,14 +226,14 @@ int fixup_seg(u16 seg, unsigned long off
if ( ((base + limit) < PAGE_SIZE) && (offset <= limit) )
{
/* Flip to expands-up. */
- limit = PAGE_OFFSET - base;
+ limit = HYPERVISOR_VIRT_PRIV_START - base;
goto flip;
}
}
else
{
/* Expands-up: All the way to Xen space? Assume 4GB if so. */
- if ( ((PAGE_OFFSET - (base + limit)) < PAGE_SIZE) &&
+ if ( ((HYPERVISOR_VIRT_PRIV_START - (base + limit)) < PAGE_SIZE) &&
(offset > limit) )
{
/* Flip to expands-down. */
Index: xen/arch/x86/traps.c
===================================================================
--- xen.orig/arch/x86/traps.c 2005-04-15 15:31:22.000000000 +0200
+++ xen/arch/x86/traps.c 2005-04-19 11:15:32.000000000 +0200
@@ -284,7 +284,7 @@ asmlinkage int do_page_fault(struct xen_
return EXCRET_fault_fixed;
}
- if ( (addr < PAGE_OFFSET) &&
+ if ( (addr < HYPERVISOR_VIRT_PRIV_START) &&
((regs->error_code & 3) == 3) && /* write-protection fault */
ptwr_do_page_fault(d, addr) )
{
@@ -1102,7 +1102,7 @@ long do_set_trap_table(trap_info_t *trap
#if defined(__i386__)
#define DB_VALID_ADDR(_a) \
- ((_a) <= (PAGE_OFFSET - 4))
+ ((_a) <= (HYPERVISOR_VIRT_PRIV_START - 4))
#elif defined(__x86_64__)
#define DB_VALID_ADDR(_a) \
((_a) >= HYPERVISOR_VIRT_END) || ((_a) <= (HYPERVISOR_VIRT_START-8))
Index: xen/arch/x86/x86_32/mm.c
===================================================================
--- xen.orig/arch/x86/x86_32/mm.c 2005-04-18 20:33:03.000000000 +0200
+++ xen/arch/x86/x86_32/mm.c 2005-04-19 11:15:32.000000000 +0200
@@ -248,7 +248,7 @@ int check_descriptor(struct desc_struct
/* Check that base is at least a page away from Xen-private area. */
base = (b&(0xff<<24)) | ((b&0xff)<<16) | (a>>16);
- if ( base >= (PAGE_OFFSET - PAGE_SIZE) )
+ if ( base >= (HYPERVISOR_VIRT_PRIV_START - PAGE_SIZE) )
goto bad;
/* Check and truncate the limit if necessary. */
@@ -281,9 +281,9 @@ int check_descriptor(struct desc_struct
* limit == 0x00000 provides 4kB access (if G=1).
*/
if ( ((base + limit) <= base) ||
- ((base + limit) > PAGE_OFFSET) )
+ ((base + limit) > HYPERVISOR_VIRT_PRIV_START) )
{
- limit = PAGE_OFFSET - base;
+ limit = HYPERVISOR_VIRT_PRIV_START - base;
truncate:
if ( !(b & _SEGMENT_G) )
goto bad; /* too dangerous; too hard to work out... */
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