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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [linux-2.6.18-xen] [IA64] Cleanup vdso paravirtualization.
# HG changeset patch
# User Alex Williamson <alex.williamson@xxxxxx>
# Date 1184882522 21600
# Node ID b64323b3a96337535f16e69d17a46086d069d941
# Parent dc1cdd6bbbf2365f6e6c8fff63358280e528b95b
[IA64] Cleanup vdso paravirtualization.
Hyperprivop calling convention was changed such that vpsr.ic
is left intact. So we don't have to worry about itlb miss
fault with vpsr.ic = 0
Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
arch/ia64/Kconfig | 2 -
arch/ia64/kernel/gate.S | 63 +++++++++++++-------------------------------
arch/ia64/kernel/gate.lds.S | 8 -----
arch/ia64/kernel/patch.c | 40 ---------------------------
arch/ia64/xen/hypercall.S | 37 -------------------------
5 files changed, 20 insertions(+), 130 deletions(-)
diff -r dc1cdd6bbbf2 -r b64323b3a963 arch/ia64/Kconfig
--- a/arch/ia64/Kconfig Thu Jul 19 15:45:59 2007 -0600
+++ b/arch/ia64/Kconfig Thu Jul 19 16:02:02 2007 -0600
@@ -66,7 +66,7 @@ config XEN
both as a guest OS on Xen and natively on hardware.
config XEN_IA64_VDSO_PARAVIRT
- bool
+ bool "Xen/IA64 vdso area paravirtualization"
depends on XEN && !ITANIUM
default y
help
diff -r dc1cdd6bbbf2 -r b64323b3a963 arch/ia64/kernel/gate.S
--- a/arch/ia64/kernel/gate.S Thu Jul 19 15:45:59 2007 -0600
+++ b/arch/ia64/kernel/gate.S Thu Jul 19 16:02:02 2007 -0600
@@ -33,17 +33,6 @@
.xdata4 ".data.patch.brl_fsys_bubble_down", 1b-.
#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
- // The page in which hyperprivop lives must be pinned by ITR.
- // However vDSO area isn't pinned. So issuing hyperprivop
- // from vDSO page causes trouble that Kevin pointed out.
- // After clearing vpsr.ic, the vcpu is pre-empted and the itlb
- // is flushed. Then vcpu get cpu again, tlb miss fault occures.
- // However it results in nested dtlb fault because vpsr.ic is off.
- // To avoid such a situation, we jump into the kernel text area
- // which is pinned, and then issue hyperprivop and return back
- // to vDSO page.
- // This is Dan Magenheimer's idea.
-
// 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.
@@ -52,21 +41,7 @@
#define LOAD_RUNNING_ON_XEN(reg) \
[1:] movl reg=0; \
.xdata4 ".data.patch.running_on_xen", 1b-.
-
- .section ".data.patch.brl_xen_ssm_i_0", "a"
- .previous
-#define BRL_COND_XEN_SSM_I_0(pr) \
-[1:](pr)brl.cond.sptk 0; \
- ;; ; \
- .xdata4 ".data.patch.brl_xen_ssm_i_0", 1b-.
-
- .section ".data.patch.brl_xen_ssm_i_1", "a"
- .previous
-#define BRL_COND_XEN_SSM_I_1(pr) \
-[1:](pr)brl.cond.sptk 0; \
- ;; ; \
- .xdata4 ".data.patch.brl_xen_ssm_i_1", 1b-.
-#endif
+#endif /* CONFIG_XEN_IA64_VDSO_PARAVIRT */
GLOBAL_ENTRY(__kernel_syscall_via_break)
.prologue
@@ -111,11 +86,9 @@ 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
// r20 = 1
// r22 = &vcpu->vcpu_info->evtchn_upcall_mask
- // r23 = &vpsr.ic
// r24 = &vcpu->vcpu_info->evtchn_upcall_pending
// r25 = tmp
// r28 = &running_on_xen
@@ -130,8 +103,6 @@ GLOBAL_ENTRY(__kernel_syscall_via_epc)
#define isRaw p13
LOAD_RUNNING_ON_XEN(r28)
movl r22=XSI_PSR_I_ADDR
- ;;
- movl r23=XSI_PSR_IC
mov r20=1
;;
ld4 r30=[r28]
@@ -144,8 +115,8 @@ GLOBAL_ENTRY(__kernel_syscall_via_epc)
(isXen) adds r24=-1,r22
(isXen) st1 [r22]=r20
(isXen) rum psr.be
- ;;
-#else
+#else
+ ;;
rsm psr.be | psr.i // M2 (5 cyc to srlz.d)
#endif
LOAD_FSYSCALL_TABLE(r14) // X
@@ -177,15 +148,26 @@ 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
- ;;
+
+#define XEN_SET_PSR_I(pr) \
+(pr) ld1 r31=[r22]; \
+(pr) ld1 r25=[r24]; \
+ ;; \
+(pr) st1 [r22]=r0; \
+(pr) cmp.ne.unc p14,p0=r0,r31; \
+ ;; \
+(p14) cmp.ne.unc p11,p0=r0,r25; \
+ ;; \
+(p11) st1 [r22]=r20; \
+(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
- BRL_COND_XEN_SSM_I_0(p14)
- .global .vdso_ssm_i_0_ret
-.vdso_ssm_i_0_ret:
+ XEN_SET_PSR_I(p14)
#else
nop.i 0
;;
@@ -213,19 +195,12 @@ GLOBAL_ENTRY(__kernel_syscall_via_epc)
#endif
#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
(isRaw) ssm psr.i
- BRL_COND_XEN_SSM_I_1(isXen)
- .global .vdso_ssm_i_1_ret
-.vdso_ssm_i_1_ret:
+ XEN_SET_PSR_I(isXen)
#else
ssm psr.i
#endif
mov r10=-1
(p10) mov r8=EINVAL
-#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
- dv_serialize_data // shut up gas warning.
- // we know xen_hyper_ssm_i_0 or xen_hyper_ssm_i_1
- // doesn't change p9 and p10
-#endif
(p9) mov r8=ENOSYS
FSYS_RETURN
END(__kernel_syscall_via_epc)
diff -r dc1cdd6bbbf2 -r b64323b3a963 arch/ia64/kernel/gate.lds.S
--- a/arch/ia64/kernel/gate.lds.S Thu Jul 19 15:45:59 2007 -0600
+++ b/arch/ia64/kernel/gate.lds.S Thu Jul 19 16:02:02 2007 -0600
@@ -48,14 +48,6 @@ SECTIONS
__start_gate_running_on_xen_patchlist = .;
*(.data.patch.running_on_xen)
__end_gate_running_on_xen_patchlist = .;
-
- __start_gate_brl_xen_ssm_i_0_patchlist = .;
- *(.data.patch.brl_xen_ssm_i_0)
- __end_gate_brl_xen_ssm_i_0_patchlist = .;
-
- __start_gate_brl_xen_ssm_i_1_patchlist = .;
- *(.data.patch.brl_xen_ssm_i_1)
- __end_gate_brl_xen_ssm_i_1_patchlist = .;
#endif
}
:readable
.IA_64.unwind_info : { *(.IA_64.unwind_info*) }
diff -r dc1cdd6bbbf2 -r b64323b3a963 arch/ia64/kernel/patch.c
--- a/arch/ia64/kernel/patch.c Thu Jul 19 15:45:59 2007 -0600
+++ b/arch/ia64/kernel/patch.c Thu Jul 19 16:02:02 2007 -0600
@@ -204,47 +204,8 @@ patch_running_on_xen(unsigned long start
ia64_sync_i();
ia64_srlz_i();
}
-
-static void
-patch_brl_symaddr(unsigned long start, unsigned long end,
- unsigned long symaddr)
-{
- s32 *offp = (s32 *)start;
- u64 ip;
-
- while (offp < (s32 *)end) {
- ip = (u64)offp + *offp;
- ia64_patch_imm60((u64)ia64_imva((void *)ip),
- (u64)(symaddr - (ip & -16)) / 16);
- ia64_fc((void *)ip);
- ++offp;
- }
- ia64_sync_i();
- ia64_srlz_i();
-}
-
-#define EXTERN_PATCHLIST(name) \
- extern char __start_gate_brl_##name##_patchlist[]; \
- extern char __end_gate_brl_##name##_patchlist[]; \
- extern char name[]
-
-#define PATCH_BRL_SYMADDR(name)
\
- patch_brl_symaddr((unsigned long)__start_gate_brl_##name##_patchlist, \
- (unsigned long)__end_gate_brl_##name##_patchlist, \
- (unsigned long)name)
-
-static void
-patch_brl_in_vdso(void)
-{
- EXTERN_PATCHLIST(xen_ssm_i_0);
- EXTERN_PATCHLIST(xen_ssm_i_1);
-
- PATCH_BRL_SYMADDR(xen_ssm_i_0);
- PATCH_BRL_SYMADDR(xen_ssm_i_1);
-}
#else
#define patch_running_on_xen(start, end) do { } while (0)
-#define patch_brl_in_vdso() do { } while (0)
#endif
void __init
@@ -257,7 +218,6 @@ ia64_patch_gate (void)
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));
- patch_brl_in_vdso();
#endif
ia64_patch_vtop(START(vtop), END(vtop));
ia64_patch_mckinley_e9(START(mckinley_e9), END(mckinley_e9));
diff -r dc1cdd6bbbf2 -r b64323b3a963 arch/ia64/xen/hypercall.S
--- a/arch/ia64/xen/hypercall.S Thu Jul 19 15:45:59 2007 -0600
+++ b/arch/ia64/xen/hypercall.S Thu Jul 19 16:02:02 2007 -0600
@@ -133,46 +133,9 @@ GLOBAL_ENTRY(xen_send_ipi)
;;
END(xen_send_ipi)
-#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
-// Those are vdso specialized.
-// In fsys mode, call, ret can't be used.
-
- // see xen_ssm_i() in privop.h
- // r22 = &vcpu->vcpu_info->evtchn_upcall_mask
- // r23 = &vpsr.ic
- // r24 = &vcpu->vcpu_info->evtchn_upcall_pending
- // r25 = tmp
- // r31 = tmp
- // p11 = tmp
- // p14 = tmp
-#define XEN_SET_PSR_I \
- ld1 r31=[r22]; \
- ld1 r25=[r24]; \
- ;; \
- st1 [r22]=r0; \
- cmp.ne.unc p14,p0=r0,r31; \
- ;; \
-(p14) cmp.ne.unc p11,p0=r0,r25; \
- ;; \
-(p11) st1 [r22]=r20; \
-(p11) XEN_HYPER_SSM_I;
-
-GLOBAL_ENTRY(xen_ssm_i_0)
- XEN_SET_PSR_I
- brl.cond.sptk .vdso_ssm_i_0_ret
- ;;
-END(xen_ssm_i_0)
-
-GLOBAL_ENTRY(xen_ssm_i_1)
- XEN_SET_PSR_I
- brl.cond.sptk .vdso_ssm_i_1_ret
- ;;
-END(xen_ssm_i_1)
-
GLOBAL_ENTRY(__hypercall)
mov r2=r37
break 0x1000
br.ret.sptk.many b0
;;
END(__hypercall)
-#endif
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