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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Cleaner GDT interface. Xen now reserves the last 2 pages of a full-size
ChangeSet 1.1443, 2005/05/18 14:12:57+01:00, kaf24@xxxxxxxxxxxxxxxxxxxx
Cleaner GDT interface. Xen now reserves the last 2 pages of a full-size
(16 page) GDT. A guest can register a GDT with up to 7k entries. Xen
automatically makes the GDT up to max size with empty page mappings,
and turns page faults in that area to #GP(selector).
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
b/freebsd-5.3-xen-sparse/i386-xen/i386-xen/machdep.c | 8
b/freebsd-5.3-xen-sparse/i386-xen/i386-xen/mp_machdep.c | 2
b/linux-2.6.11-xen-sparse/arch/xen/i386/kernel/smpboot.c | 3
b/linux-2.6.11-xen-sparse/include/asm-xen/asm-i386/segment.h | 4
b/linux-2.6.11-xen-sparse/include/asm-xen/asm-x86_64/segment.h | 2
b/netbsd-2.0-xen-sparse/sys/arch/xen/i386/machdep.c | 4
b/tools/libxc/xc_linux_restore.c | 7
b/xen/arch/x86/boot/x86_32.S | 34 +-
b/xen/arch/x86/boot/x86_64.S | 75 +++---
b/xen/arch/x86/dom0_ops.c | 10
b/xen/arch/x86/domain.c | 108 +++++----
b/xen/arch/x86/domain_build.c | 3
b/xen/arch/x86/mm.c | 63 +----
b/xen/arch/x86/setup.c | 24 +-
b/xen/arch/x86/trampoline.S | 7
b/xen/arch/x86/traps.c | 117
++++++----
b/xen/arch/x86/x86_32/seg_fixup.c | 14 -
b/xen/arch/x86/x86_32/traps.c | 5
b/xen/include/asm-x86/config.h | 28 +-
b/xen/include/asm-x86/desc.h | 23 +
b/xen/include/asm-x86/domain.h | 2
b/xen/include/asm-x86/ldt.h | 2
b/xen/include/asm-x86/mm.h | 3
b/xen/include/asm-x86/processor.h | 9
b/xen/include/public/arch-x86_32.h | 28 --
b/xen/include/public/arch-x86_64.h | 25 --
xen/include/asm-x86/x86_64/ldt.h | 39 ---
27 files changed, 292 insertions(+), 357 deletions(-)
diff -Nru a/freebsd-5.3-xen-sparse/i386-xen/i386-xen/machdep.c
b/freebsd-5.3-xen-sparse/i386-xen/i386-xen/machdep.c
--- a/freebsd-5.3-xen-sparse/i386-xen/i386-xen/machdep.c 2005-05-18
10:05:49 -04:00
+++ b/freebsd-5.3-xen-sparse/i386-xen/i386-xen/machdep.c 2005-05-18
10:05:49 -04:00
@@ -1599,11 +1599,7 @@
gdt_segs[GDATA_SEL].ssd_limit = atop(0 - ((1 << 26) - (1 << 22) + (1 <<
16)));
#endif
#ifdef SMP
- /* XXX this will blow up if there are more than 512/NGDT vcpus - will
never
- * be an issue in the real world but should add an assert on general
principles
- * we'll likely blow up when we hit LAST_RESERVED_GDT_ENTRY, at which
point we
- * would need to start allocating more pages for the GDT
- */
+ /* XXX this will blow up if there are more than 512/NGDT vcpus */
pc = &SMP_prvspace[0].pcpu;
for (i = 0; i < ncpus; i++) {
cpu_add(i, (i == 0));
@@ -1633,7 +1629,7 @@
PT_SET_MA(gdt, *vtopte((unsigned long)gdt) & ~PG_RW);
gdtmachpfn = vtomach(gdt) >> PAGE_SHIFT;
- PANIC_IF(HYPERVISOR_set_gdt(&gdtmachpfn, LAST_RESERVED_GDT_ENTRY + 1)
!= 0);
+ PANIC_IF(HYPERVISOR_set_gdt(&gdtmachpfn, 512) != 0);
lgdt_finish();
diff -Nru a/freebsd-5.3-xen-sparse/i386-xen/i386-xen/mp_machdep.c
b/freebsd-5.3-xen-sparse/i386-xen/i386-xen/mp_machdep.c
--- a/freebsd-5.3-xen-sparse/i386-xen/i386-xen/mp_machdep.c 2005-05-18
10:05:52 -04:00
+++ b/freebsd-5.3-xen-sparse/i386-xen/i386-xen/mp_machdep.c 2005-05-18
10:05:52 -04:00
@@ -533,7 +533,7 @@
myid = bootAP;
gdtmachpfn = vtomach(gdt) >> PAGE_SHIFT;
- PANIC_IF(HYPERVISOR_set_gdt(&gdtmachpfn, LAST_RESERVED_GDT_ENTRY + 1)
!= 0);
+ PANIC_IF(HYPERVISOR_set_gdt(&gdtmachpfn, 512) != 0);
lgdt_finish();
diff -Nru a/linux-2.6.11-xen-sparse/arch/xen/i386/kernel/smpboot.c
b/linux-2.6.11-xen-sparse/arch/xen/i386/kernel/smpboot.c
--- a/linux-2.6.11-xen-sparse/arch/xen/i386/kernel/smpboot.c 2005-05-18
10:05:49 -04:00
+++ b/linux-2.6.11-xen-sparse/arch/xen/i386/kernel/smpboot.c 2005-05-18
10:05:49 -04:00
@@ -856,9 +856,6 @@
cpu_gdt_descr[cpu].size = cpu_gdt_descr[0].size;
memcpy((void *)cpu_gdt_descr[cpu].address,
(void *)cpu_gdt_descr[0].address, cpu_gdt_descr[0].size);
- memset((char *)cpu_gdt_descr[cpu].address +
- FIRST_RESERVED_GDT_ENTRY * 8, 0,
- NR_RESERVED_GDT_ENTRIES * 8);
memset(&ctxt, 0, sizeof(ctxt));
diff -Nru a/linux-2.6.11-xen-sparse/include/asm-xen/asm-i386/segment.h
b/linux-2.6.11-xen-sparse/include/asm-xen/asm-i386/segment.h
--- a/linux-2.6.11-xen-sparse/include/asm-xen/asm-i386/segment.h
2005-05-18 10:05:49 -04:00
+++ b/linux-2.6.11-xen-sparse/include/asm-xen/asm-i386/segment.h
2005-05-18 10:05:49 -04:00
@@ -74,9 +74,9 @@
#define GDT_ENTRY_DOUBLEFAULT_TSS 31
/*
- * The GDT has LAST_RESERVED_GDT_ENTRY + 1 entries
+ * The GDT has 32 entries
*/
-#define GDT_ENTRIES (LAST_RESERVED_GDT_ENTRY + 1)
+#define GDT_ENTRIES 32
#define GDT_SIZE (GDT_ENTRIES * 8)
diff -Nru a/linux-2.6.11-xen-sparse/include/asm-xen/asm-x86_64/segment.h
b/linux-2.6.11-xen-sparse/include/asm-xen/asm-x86_64/segment.h
--- a/linux-2.6.11-xen-sparse/include/asm-xen/asm-x86_64/segment.h
2005-05-18 10:05:49 -04:00
+++ b/linux-2.6.11-xen-sparse/include/asm-xen/asm-x86_64/segment.h
2005-05-18 10:05:49 -04:00
@@ -40,7 +40,7 @@
#define FS_TLS_SEL ((GDT_ENTRY_TLS_MIN+FS_TLS)*8 + 3)
#define IDT_ENTRIES 256
-#define GDT_ENTRIES (LAST_RESERVED_GDT_ENTRY + 1)
+#define GDT_ENTRIES 16
#define GDT_SIZE (GDT_ENTRIES * 8)
#define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)
diff -Nru a/netbsd-2.0-xen-sparse/sys/arch/xen/i386/machdep.c
b/netbsd-2.0-xen-sparse/sys/arch/xen/i386/machdep.c
--- a/netbsd-2.0-xen-sparse/sys/arch/xen/i386/machdep.c 2005-05-18 10:05:51
-04:00
+++ b/netbsd-2.0-xen-sparse/sys/arch/xen/i386/machdep.c 2005-05-18 10:05:52
-04:00
@@ -1430,8 +1430,8 @@
pmap_kenter_pa((vaddr_t)gdt, (uint32_t)gdt - KERNBASE,
VM_PROT_READ);
XENPRINTK(("loading gdt %lx, %d entries\n", frames[0] << PAGE_SHIFT,
- LAST_RESERVED_GDT_ENTRY + 1));
- if (HYPERVISOR_set_gdt(frames, LAST_RESERVED_GDT_ENTRY + 1))
+ NGDT);
+ if (HYPERVISOR_set_gdt(frames, NGDT))
panic("HYPERVISOR_set_gdt failed!\n");
lgdt_finish();
#endif
diff -Nru a/tools/libxc/xc_linux_restore.c b/tools/libxc/xc_linux_restore.c
--- a/tools/libxc/xc_linux_restore.c 2005-05-18 10:05:51 -04:00
+++ b/tools/libxc/xc_linux_restore.c 2005-05-18 10:05:51 -04:00
@@ -535,13 +535,6 @@
ctxt.gdt_frames[i] = pfn_to_mfn_table[pfn];
}
- /* Zero hypervisor GDT entries (supresses ugly warning) */
- p_gdt = xc_map_foreign_range(
- xc_handle, dom, PAGE_SIZE, PROT_WRITE, ctxt.gdt_frames[0]);
- memset( p_gdt + FIRST_RESERVED_GDT_ENTRY*8, 0,
- NR_RESERVED_GDT_ENTRIES*8 );
- munmap( p_gdt, PAGE_SIZE );
-
/* Uncanonicalise the page table base pointer. */
pfn = ctxt.pt_base >> PAGE_SHIFT;
if ( (pfn >= nr_pfns) || ((pfn_type[pfn]<ABTYPE_MASK) != L2TAB) )
diff -Nru a/xen/arch/x86/boot/x86_32.S b/xen/arch/x86/boot/x86_32.S
--- a/xen/arch/x86/boot/x86_32.S 2005-05-18 10:05:49 -04:00
+++ b/xen/arch/x86/boot/x86_32.S 2005-05-18 10:05:49 -04:00
@@ -1,5 +1,6 @@
#include <xen/config.h>
#include <public/xen.h>
+#include <asm/desc.h>
#include <asm/page.h>
#define SECONDARY_CPU_FLAG 0xA5A5A5A5
@@ -181,40 +182,39 @@
.word 0
idt_descr:
- .word 256*8-1
+ .word 256*8-1
idt:
.long idt_table
.word 0
gdt_descr:
- .word (LAST_RESERVED_GDT_ENTRY*8)+7
-gdt:
- .long gdt_table /* gdt base */
+ .word LAST_RESERVED_GDT_BYTE
+gdt:
+ .long gdt_table - FIRST_RESERVED_GDT_BYTE
.word 0
nopaging_gdt_descr:
- .word (LAST_RESERVED_GDT_ENTRY*8)+7
- .long gdt_table-__PAGE_OFFSET
+ .word LAST_RESERVED_GDT_BYTE
+ .long gdt_table - FIRST_RESERVED_GDT_BYTE - __PAGE_OFFSET
- ALIGN
+ .org 0x1000
/* NB. Rings != 0 get access up to 0xFC400000. This allows access to the */
/* machine->physical mapping table. Ring 0 can access all memory. */
ENTRY(gdt_table)
- .fill FIRST_RESERVED_GDT_ENTRY,8,0
.quad 0x0000000000000000 /* unused */
- .quad 0x00cf9a000000ffff /* 0x0808 ring 0 4.00GB code at 0x0 */
- .quad 0x00cf92000000ffff /* 0x0810 ring 0 4.00GB data at 0x0 */
- .quad 0x00cfba000000c3ff /* 0x0819 ring 1 3.95GB code at 0x0 */
- .quad 0x00cfb2000000c3ff /* 0x0821 ring 1 3.95GB data at 0x0 */
- .quad 0x00cffa000000c3ff /* 0x082b ring 3 3.95GB code at 0x0 */
- .quad 0x00cff2000000c3ff /* 0x0833 ring 3 3.95GB data at 0x0 */
+ .quad 0x00cf9a000000ffff /* 0xe008 ring 0 4.00GB code at 0x0 */
+ .quad 0x00cf92000000ffff /* 0xe010 ring 0 4.00GB data at 0x0 */
+ .quad 0x00cfba000000c3ff /* 0xe019 ring 1 3.95GB code at 0x0 */
+ .quad 0x00cfb2000000c3ff /* 0xe021 ring 1 3.95GB data at 0x0 */
+ .quad 0x00cffa000000c3ff /* 0xe02b ring 3 3.95GB code at 0x0 */
+ .quad 0x00cff2000000c3ff /* 0xe033 ring 3 3.95GB data at 0x0 */
.quad 0x0000000000000000 /* unused */
.fill 2*NR_CPUS,8,0 /* space for TSS and LDT per CPU */
- .org 0x1000
-ENTRY(idle_pg_table) # Initial page directory is 4kB
.org 0x2000
+ENTRY(idle_pg_table) # Initial page directory is 4kB
+ .org 0x3000
ENTRY(cpu0_stack)
- .org 0x2000 + STACK_SIZE
+ .org 0x3000 + STACK_SIZE
ENTRY(stext)
ENTRY(_stext)
diff -Nru a/xen/arch/x86/boot/x86_64.S b/xen/arch/x86/boot/x86_64.S
--- a/xen/arch/x86/boot/x86_64.S 2005-05-18 10:05:49 -04:00
+++ b/xen/arch/x86/boot/x86_64.S 2005-05-18 10:05:49 -04:00
@@ -1,5 +1,6 @@
#include <xen/config.h>
#include <public/xen.h>
+#include <asm/desc.h>
#include <asm/page.h>
#include <asm/msr.h>
@@ -51,7 +52,7 @@
cli
/* Set up a few descriptors: on entry only CS is guaranteed good. */
- lgdt %cs:0x1001f0
+ lgdt %cs:0x100400
mov $(__HYPERVISOR_DS32),%ecx
mov %ecx,%ds
mov %ecx,%es
@@ -64,7 +65,7 @@
jne not_multiboot
/* Save the Multiboot info structure for later use. */
- mov %ebx,0x1001e0
+ mov %ebx,0x100300
/* We begin by interrogating the CPU for the presence of long mode. */
mov $0x80000000,%eax
@@ -167,44 +168,40 @@
loop 1b
/* Pass off the Multiboot info structure to C land. */
- mov 0x1001e0,%edi
+ mov 0x100300,%edi
lea start(%rip),%rax
sub $0x100000,%rax
add %rax,%rdi
call __start_xen
ud2 /* Force a panic (invalid opcode). */
+/* This is the default interrupt handler. */
+int_msg:
+ .asciz "Unknown interrupt\n"
+ignore_int:
+ cld
+ leaq int_msg(%rip),%rdi
+ call printf
+1: jmp 1b
+
.code32
- .org 0x1e0
+ .org 0x300
/*** DESCRIPTOR TABLES ***/
.globl idt
-.globl gdt
+.globl gdt
- .org 0x1f0
- .word (LAST_RESERVED_GDT_ENTRY*8)+7
- .long 0x100200 # gdt_table
+ .org 0x400
+ .word LAST_RESERVED_GDT_BYTE
+ .long 0x101000 - FIRST_RESERVED_GDT_BYTE
- .org 0x200
-ENTRY(gdt_table)
- .fill FIRST_RESERVED_GDT_ENTRY,8,0
- .quad 0x0000000000000000 /* unused */
- .quad 0x00cf9a000000ffff /* 0x0808 ring 0 code, compatibility */
- .quad 0x00af9a000000ffff /* 0x0810 ring 0 code, 64-bit mode */
- .quad 0x00cf92000000ffff /* 0x0818 ring 0 data */
- .quad 0x00cffa000000ffff /* 0x0823 ring 3 code, compatibility */
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