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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [linux-2.6.18-xen] [IA64] Introduce xen specific gate page.
# HG changeset patch
# User Alex Williamson <alex.williamson@xxxxxx>
# Date 1185989016 21600
# Node ID 59582461a590f996fc2d09f14e4cef2625beb8de
# Parent 1c675d3a2a22e642dbbf32e164a170ee06cc53a2
[IA64] Introduce xen specific gate page.
With this transparent paravirtualization over head is eliminated.
Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
arch/ia64/Kconfig | 7 ---
arch/ia64/kernel/Makefile | 55 ++++++++++++++++++++++++++++
arch/ia64/kernel/gate.S | 78 ++++++++++++++--------------------------
arch/ia64/kernel/gate.lds.S | 24 +++++++++---
arch/ia64/kernel/patch.c | 47 ++++++++++++------------
arch/ia64/kernel/vmlinux.lds.S | 4 ++
arch/ia64/kernel/xengate-data.S | 3 +
arch/ia64/mm/init.c | 22 ++++++++++-
8 files changed, 152 insertions(+), 88 deletions(-)
diff -r 1c675d3a2a22 -r 59582461a590 arch/ia64/Kconfig
--- a/arch/ia64/Kconfig Wed Aug 01 09:53:36 2007 -0600
+++ b/arch/ia64/Kconfig Wed Aug 01 11:23:36 2007 -0600
@@ -64,13 +64,6 @@ config XEN
help
Enable Xen hypervisor support. Resulting kernel runs
both as a guest OS on Xen and natively on hardware.
-
-config XEN_IA64_VDSO_PARAVIRT
- bool "Xen/IA64 vdso area paravirtualization"
- depends on XEN && !ITANIUM
- default y
- help
- vDSO paravirtualization
config XEN_IA64_EXPOSE_P2M
bool "Xen/IA64 exposure p2m table"
diff -r 1c675d3a2a22 -r 59582461a590 arch/ia64/kernel/Makefile
--- a/arch/ia64/kernel/Makefile Wed Aug 01 09:53:36 2007 -0600
+++ b/arch/ia64/kernel/Makefile Wed Aug 01 11:23:36 2007 -0600
@@ -61,3 +61,58 @@ GATECFLAGS_gate-syms.o = -r
# We must build gate.so before we can assemble it.
# Note: kbuild does not track this dependency due to usage of .incbin
$(obj)/gate-data.o: $(obj)/gate.so
+
+
+#
+# gate page paravirtualization for xen
+#
+obj-$(CONFIG_XEN) += xengate-data.o
+
+# The gate DSO image is built using a special linker script.
+targets += xengate.so xengate-syms.o
+
+extra-$(CONFIG_XEN) += xengate.so xengate.lds xengate.o
+
+AFLAGS_xengate.o += -D__XEN_IA64_VDSO_PARAVIRT
+$(obj)/xengate.o: $(src)/gate.S FORCE
+ $(call if_changed_dep,as_o_S)
+
+CPPFLAGS_xengate.lds := -P -C -U$(ARCH) -D__XEN_IA64_VDSO_PARAVIRT
+$(obj)/xengate.lds: $(src)/gate.lds.S
+ $(call if_changed_dep,cpp_lds_S)
+
+GATECFLAGS_xengate.so = -shared -s -Wl,-soname=linux-gate.so.1 \
+ $(call ld-option, -Wl$(comma)--hash-style=sysv)
+$(obj)/xengate.so: $(obj)/xengate.lds $(obj)/xengate.o FORCE
+ $(call if_changed,gate)
+
+ifeq ($(CONFIG_XEN), y)
+$(obj)/built-in.o: $(obj)/xengate-syms.o
+$(obj)/built-in.o: ld_flags += -R $(obj)/xengate-syms.o
+$(obj)/mca_recovery.o: $(obj)/gate-syms.o $(obj)/xengate-syms.o
+endif
+
+GATECFLAGS_xengate-syms.o = -r
+$(obj)/xengate-syms.o: $(obj)/xengate.lds $(obj)/xengate.o FORCE
+ $(call if_changed,gate)
+$(obj)/xengate-data.o: $(obj)/xengate.so
+
+
+#
+# .tmp_gate.o to calculate padding size for __kernel_syscall_via_epc
+#
+extra-y += gate-skip.s .tmp_gate.o
+
+ifeq ($(CONFIG_XEN), y)
+AFLAGS_gate.o += -D__KERNEL_SYSCALL_VIA_EPC_PADDING
+$(obj)/gate.o: $(obj)/gate-skip.s FORCE
+endif
+$(obj)/.tmp_gate.o: $(src)/gate.S FORCE
+ $(call if_changed_dep,as_o_S)
+quiet_cmd_gate_size = GATE_SIZE $@
+ cmd_gate_size = $(NM) --extern-only --print-size $(obj)/xengate.o | \
+ $(AWK) '/__kernel_syscall_via_epc/{printf "\t.skip 0x"$$2" - "}' > $@; \
+ $(NM) --extern-only --print-size $(obj)/.tmp_gate.o | \
+ $(AWK) '/__kernel_syscall_via_epc/{printf "0x"$$2"\n"}' >> $@
+$(obj)/gate-skip.s: $(obj)/xengate.o $(obj)/.tmp_gate.o FORCE
+ $(call if_changed,gate_size)
diff -r 1c675d3a2a22 -r 59582461a590 arch/ia64/kernel/gate.S
--- a/arch/ia64/kernel/gate.S Wed Aug 01 09:53:36 2007 -0600
+++ b/arch/ia64/kernel/gate.S Wed Aug 01 11:23:36 2007 -0600
@@ -31,17 +31,6 @@
#define BRL_COND_FSYS_BUBBLE_DOWN(pr) \
[1:](pr)brl.cond.sptk 0; \
.xdata4 ".data.patch.brl_fsys_bubble_down", 1b-.
-
-#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
- // Currently is_running_on_xen() is defined as running_on_xen.
- // If is_running_on_xen() is a real function, we must update
- // according to it.
- .section ".data.patch.running_on_xen", "a"
- .previous
-#define LOAD_RUNNING_ON_XEN(reg) \
-[1:] movl reg=0; \
- .xdata4 ".data.patch.running_on_xen", 1b-.
-#endif /* CONFIG_XEN_IA64_VDSO_PARAVIRT */
# define ARG0_OFF (16 + IA64_SIGFRAME_ARG0_OFFSET)
# define ARG1_OFF (16 + IA64_SIGFRAME_ARG1_OFFSET)
@@ -332,37 +321,24 @@ GLOBAL_ENTRY(__kernel_syscall_via_epc)
mov r10=0 // A default to successful
syscall execution
epc // B causes split-issue
}
-#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
+ ;;
+#ifdef __XEN_IA64_VDSO_PARAVIRT
// r20 = 1
// r22 = &vcpu->vcpu_info->evtchn_upcall_mask
// r24 = &vcpu->vcpu_info->evtchn_upcall_pending
// r25 = tmp
- // r28 = &running_on_xen
- // r30 = running_on_xen
// r31 = tmp
// p11 = tmp
- // p12 = running_on_xen
- // p13 = !running_on_xen
// p14 = tmp
- // p15 = tmp
-#define isXen p12
-#define isRaw p13
- LOAD_RUNNING_ON_XEN(r28)
+ mov r20=1
movl r22=XSI_PSR_I_ADDR
- mov r20=1
- ;;
- ld4 r30=[r28]
- ;;
- cmp.ne isXen,isRaw=r0,r30
- ;;
-(isXen) ld8 r22=[r22]
- ;;
-(isRaw) rsm psr.be | psr.i
-(isXen) adds r24=-1,r22
-(isXen) st1 [r22]=r20
-(isXen) rum psr.be
-#else
- ;;
+ ;;
+ ld8 r22=[r22]
+ ;;
+ st1 [r22]=r20
+ rum psr.be
+ adds r24=-1,r22
+#else
rsm psr.be | psr.i // M2 (5 cyc to srlz.d)
#endif
LOAD_FSYSCALL_TABLE(r14) // X
@@ -370,14 +346,14 @@ GLOBAL_ENTRY(__kernel_syscall_via_epc)
mov r16=IA64_KR(CURRENT) // M2 (12 cyc)
shladd r18=r17,3,r14 // A
mov r19=NR_syscalls-1 // A
+#ifdef __XEN_IA64_VDSO_PARAVIRT
+ XEN_HYPER_GET_PSR
;;
lfetch [r18] // M0|1
-#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
-(isRaw) mov r29=psr
-(isXen) XEN_HYPER_GET_PSR
- ;;
-(isXen) mov r29=r8
-#else
+ mov r29=r8
+#else
+ ;;
+ lfetch [r18] // M0|1
mov r29=psr // M2 (12 cyc)
#endif
// If r17 is a NaT, p6 will be zero
@@ -393,7 +369,7 @@ GLOBAL_ENTRY(__kernel_syscall_via_epc)
;;
nop.m 0
(p6) tbit.z.unc p8,p0=r18,0 // I0 (dual-issues with "mov
b7=r18"!)
-#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
+#ifdef __XEN_IA64_VDSO_PARAVIRT
#define XEN_SET_PSR_I(pred) \
(pred) ld1 r31=[r22]; \
@@ -408,12 +384,7 @@ GLOBAL_ENTRY(__kernel_syscall_via_epc)
(p11) XEN_HYPER_SSM_I;
;;
- // p14 = running_on_xen && p8
- // p15 = !running_on_xen && p8
-(p8) cmp.ne.unc p14,p15=r0,r30
- ;;
-(p15) ssm psr.i
- XEN_SET_PSR_I(p14)
+ XEN_SET_PSR_I(p8)
#else
nop.i 0
;;
@@ -439,9 +410,8 @@ GLOBAL_ENTRY(__kernel_syscall_via_epc)
#else
BRL_COND_FSYS_BUBBLE_DOWN(p6)
#endif
-#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
-(isRaw) ssm psr.i
- XEN_SET_PSR_I(isXen)
+#ifdef __XEN_IA64_VDSO_PARAVIRT
+ XEN_SET_PSR_I(p0)
#else
ssm psr.i
#endif
@@ -449,4 +419,12 @@ GLOBAL_ENTRY(__kernel_syscall_via_epc)
(p10) mov r8=EINVAL
(p9) mov r8=ENOSYS
FSYS_RETURN
+#ifdef __KERNEL_SYSCALL_VIA_EPC_PADDING
+ /*
+ * All values/sizes of __kernel_xxx symbol in gate.so and xengate.so
+ * must be same to each other.
+ * Adjust symbol size in gate.so to be same to the one in xengate.so.
+ */
+.include "arch/ia64/kernel/gate-skip.s"
+#endif
END(__kernel_syscall_via_epc)
diff -r 1c675d3a2a22 -r 59582461a590 arch/ia64/kernel/gate.lds.S
--- a/arch/ia64/kernel/gate.lds.S Wed Aug 01 09:53:36 2007 -0600
+++ b/arch/ia64/kernel/gate.lds.S Wed Aug 01 11:23:36 2007 -0600
@@ -28,6 +28,24 @@ SECTIONS
. = GATE_ADDR + 0x500;
.data.patch : {
+#ifdef __XEN_IA64_VDSO_PARAVIRT
+#define __start_gate_mckinley_e9_patchlist \
+ __start_gate_mckinley_e9_patchlist_xen
+#define __end_gate_mckinley_e9_patchlist \
+ __end_gate_mckinley_e9_patchlist_xen
+#define __start_gate_vtop_patchlist \
+ __start_gate_vtop_patchlist_xen
+#define __end_gate_vtop_patchlist \
+ __end_gate_vtop_patchlist_xen
+#define __start_gate_fsyscall_patchlist \
+ __start_gate_fsyscall_patchlist_xen
+#define __end_gate_fsyscall_patchlist \
+ __end_gate_fsyscall_patchlist_xen
+#define __start_gate_brl_fsys_bubble_down_patchlist \
+ __start_gate_brl_fsys_bubble_down_patchlist_xen
+#define __end_gate_brl_fsys_bubble_down_patchlist \
+ __end_gate_brl_fsys_bubble_down_patchlist_xen
+#endif
__start_gate_mckinley_e9_patchlist = .;
*(.data.patch.mckinley_e9)
__end_gate_mckinley_e9_patchlist = .;
@@ -43,12 +61,6 @@ SECTIONS
__start_gate_brl_fsys_bubble_down_patchlist
= .;
*(.data.patch.brl_fsys_bubble_down)
__end_gate_brl_fsys_bubble_down_patchlist =
.;
-
-#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
- __start_gate_running_on_xen_patchlist = .;
- *(.data.patch.running_on_xen)
- __end_gate_running_on_xen_patchlist = .;
-#endif
}
:readable
.IA_64.unwind_info : { *(.IA_64.unwind_info*) }
.IA_64.unwind : { *(.IA_64.unwind*) }
:readable :unwind
diff -r 1c675d3a2a22 -r 59582461a590 arch/ia64/kernel/patch.c
--- a/arch/ia64/kernel/patch.c Wed Aug 01 09:53:36 2007 -0600
+++ b/arch/ia64/kernel/patch.c Wed Aug 01 11:23:36 2007 -0600
@@ -184,41 +184,42 @@ patch_brl_fsys_bubble_down (unsigned lon
ia64_srlz_i();
}
-#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
-extern char __start_gate_running_on_xen_patchlist[];
-extern char __end_gate_running_on_xen_patchlist[];
-
-void
-patch_running_on_xen(unsigned long start, unsigned long end)
-{
- extern const int running_on_xen;
- s32 *offp = (s32 *)start;
- u64 ip;
-
- while (offp < (s32 *)end) {
- ip = (u64)ia64_imva((char *)offp + *offp);
- ia64_patch_imm64(ip, (u64)&running_on_xen);
- ia64_fc((void *)ip);
- ++offp;
- }
- ia64_sync_i();
- ia64_srlz_i();
+#ifdef CONFIG_XEN
+void __init
+ia64_patch_gate_xen (void)
+{
+ extern char __start_gate_mckinley_e9_patchlist_xen[],
__end_gate_mckinley_e9_patchlist_xen[];
+ extern char __start_gate_vtop_patchlist_xen[],
__end_gate_vtop_patchlist_xen[];
+ extern char __start_gate_fsyscall_patchlist_xen[],
__end_gate_fsyscall_patchlist_xen[];
+ extern char __start_gate_brl_fsys_bubble_down_patchlist_xen[],
__end_gate_brl_fsys_bubble_down_patchlist_xen[];
+# define START(name) ((unsigned long)
__start_gate_##name##_patchlist_xen)
+# define END(name) ((unsigned
long)__end_gate_##name##_patchlist_xen)
+
+ patch_fsyscall_table(START(fsyscall), END(fsyscall));
+ patch_brl_fsys_bubble_down(START(brl_fsys_bubble_down),
END(brl_fsys_bubble_down));
+ ia64_patch_vtop(START(vtop), END(vtop));
+ ia64_patch_mckinley_e9(START(mckinley_e9), END(mckinley_e9));
+
+# undef START
+# undef END
}
#else
-#define patch_running_on_xen(start, end) do { } while (0)
+#define ia64_patch_gate_xen() do { } while (0)
#endif
void __init
ia64_patch_gate (void)
{
+ if (is_running_on_xen()) {
+ ia64_patch_gate_xen();
+ return;
+ }
+
# define START(name) ((unsigned long)
__start_gate_##name##_patchlist)
# define END(name) ((unsigned long)__end_gate_##name##_patchlist)
patch_fsyscall_table(START(fsyscall), END(fsyscall));
patch_brl_fsys_bubble_down(START(brl_fsys_bubble_down),
END(brl_fsys_bubble_down));
-#ifdef CONFIG_XEN
- patch_running_on_xen(START(running_on_xen), END(running_on_xen));
-#endif
ia64_patch_vtop(START(vtop), END(vtop));
ia64_patch_mckinley_e9(START(mckinley_e9), END(mckinley_e9));
}
diff -r 1c675d3a2a22 -r 59582461a590 arch/ia64/kernel/vmlinux.lds.S
--- a/arch/ia64/kernel/vmlinux.lds.S Wed Aug 01 09:53:36 2007 -0600
+++ b/arch/ia64/kernel/vmlinux.lds.S Wed Aug 01 11:23:36 2007 -0600
@@ -183,6 +183,10 @@ SECTIONS
__start_gate_section = .;
*(.data.gate)
__stop_gate_section = .;
+ . = ALIGN(PAGE_SIZE);
+ __start_xen_gate_section = .;
+ *(.data.gate.xen)
+ __stop_xen_gate_section = .;
}
. = ALIGN(PAGE_SIZE); /* make sure the gate page doesn't
expose kernel data */
diff -r 1c675d3a2a22 -r 59582461a590 arch/ia64/kernel/xengate-data.S
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/arch/ia64/kernel/xengate-data.S Wed Aug 01 11:23:36 2007 -0600
@@ -0,0 +1,3 @@
+ .section .data.gate.xen, "aw"
+
+ .incbin "arch/ia64/kernel/xengate.so"
diff -r 1c675d3a2a22 -r 59582461a590 arch/ia64/mm/init.c
--- a/arch/ia64/mm/init.c Wed Aug 01 09:53:36 2007 -0600
+++ b/arch/ia64/mm/init.c Wed Aug 01 11:23:36 2007 -0600
@@ -303,16 +303,34 @@ setup_gate (void)
setup_gate (void)
{
struct page *page;
+ void *gate_page_addr = __start_gate_section;
+
+#ifdef CONFIG_XEN
+ unsigned long unused_gate;
+ extern char __start_xen_gate_section[];
+ if (is_running_on_xen()) {
+ gate_page_addr = __start_xen_gate_section;
+ unused_gate = (unsigned long)ia64_imva(__start_gate_section);
+ } else
+ unused_gate =
+ (unsigned long)ia64_imva(__start_xen_gate_section);
+#ifndef HAVE_BUGGY_SEGREL
+ ClearPageReserved(virt_to_page(unused_gate));
+ init_page_count(virt_to_page(unused_gate));
+ free_page(unused_gate);
+ ++totalram_pages;
+#endif
+#endif
/*
* Map the gate page twice: once read-only to export the ELF
* headers etc. and once execute-only page to enable
* privilege-promotion via "epc":
*/
- page = virt_to_page(ia64_imva(__start_gate_section));
+ page = virt_to_page(ia64_imva(gate_page_addr));
put_kernel_page(page, GATE_ADDR, PAGE_READONLY);
#ifdef HAVE_BUGGY_SEGREL
- page = virt_to_page(ia64_imva(__start_gate_section + PAGE_SIZE));
+ page = virt_to_page(ia64_imva(gate_page_addr + PAGE_SIZE));
put_kernel_page(page, GATE_ADDR + PAGE_SIZE, PAGE_GATE);
#else
put_kernel_page(page, GATE_ADDR + PERCPU_PAGE_SIZE, PAGE_GATE);
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