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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] [IA64] vDSO paravirtualization: paravirtualize vDSO
# HG changeset patch
# User awilliam@xxxxxxxxxxx
# Node ID 8d501f39286c28cddfd0f26e5e92a6e86176bbe4
# Parent 614deef19299e3352233d5e27017b677830d47f3
[IA64] vDSO paravirtualization: paravirtualize vDSO
paravirtualize vdso areabased on Kevin's pointout and Dan's Idea.
introduce hyperprivop HYPERPRIVOP_RSM_BE and HYPERPRIVOP_GET_PSR.
and paravirtualize vdso area using them.
Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
linux-2.6-xen-sparse/arch/ia64/Kconfig | 7 +
linux-2.6-xen-sparse/arch/ia64/kernel/gate.S | 112 +++++++++++++++++++++
linux-2.6-xen-sparse/arch/ia64/kernel/gate.lds.S | 22 ++++
linux-2.6-xen-sparse/arch/ia64/kernel/patch.c | 71 +++++++++++++
linux-2.6-xen-sparse/arch/ia64/xen/hypercall.S | 56 ++++++++++
linux-2.6-xen-sparse/include/asm-ia64/xen/privop.h | 2
xen/arch/ia64/xen/privop.c | 7 +
xen/include/public/arch-ia64.h | 4
8 files changed, 280 insertions(+), 1 deletion(-)
diff -r 614deef19299 -r 8d501f39286c linux-2.6-xen-sparse/arch/ia64/Kconfig
--- a/linux-2.6-xen-sparse/arch/ia64/Kconfig Mon Jul 24 13:04:40 2006 -0600
+++ b/linux-2.6-xen-sparse/arch/ia64/Kconfig Mon Jul 24 13:43:35 2006 -0600
@@ -70,6 +70,13 @@ config XEN_IA64_DOM0_NON_VP
default y
help
dom0 P=M model
+
+config XEN_IA64_VDSO_PARAVIRT
+ bool
+ depends on XEN && !ITANIUM
+ default y
+ help
+ vDSO paravirtualization
config SCHED_NO_NO_OMIT_FRAME_POINTER
bool
diff -r 614deef19299 -r 8d501f39286c
linux-2.6-xen-sparse/arch/ia64/kernel/gate.S
--- a/linux-2.6-xen-sparse/arch/ia64/kernel/gate.S Mon Jul 24 13:04:40
2006 -0600
+++ b/linux-2.6-xen-sparse/arch/ia64/kernel/gate.S Mon Jul 24 13:43:35
2006 -0600
@@ -14,6 +14,9 @@
#include <asm/sigcontext.h>
#include <asm/system.h>
#include <asm/unistd.h>
+#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
+# include <asm/privop.h>
+#endif
/*
* We can't easily refer to symbols inside the kernel. To avoid full runtime
relocation,
@@ -32,6 +35,52 @@
#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
+ // 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.
+ .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-.
+
+ .section ".data.patch.brl_xen_rsm_be_i", "a"
+ .previous
+#define BRL_COND_XEN_RSM_BE_I(pr) \
+[1:](pr)brl.cond.sptk 0; \
+ .xdata4 ".data.patch.brl_xen_rsm_be_i", 1b-.
+
+ .section ".data.patch.brl_xen_get_psr", "a"
+ .previous
+#define BRL_COND_XEN_GET_PSR(pr) \
+[1:](pr)brl.cond.sptk 0; \
+ .xdata4 ".data.patch.brl_xen_get_psr", 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
GLOBAL_ENTRY(__kernel_syscall_via_break)
.prologue
@@ -77,7 +126,39 @@ GLOBAL_ENTRY(__kernel_syscall_via_epc)
epc // B causes split-issue
}
;;
+#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
+ // r20 = 1
+ // r22 = &vcpu->evtchn_mask
+ // r23 = &vpsr.ic
+ // r24 = vcpu->pending_interruption
+ // 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)
+ movl r22=XSI_PSR_I_ADDR
+ movl r23=XSI_PSR_IC
+ movl r24=XSI_PSR_I_ADDR+(XSI_PEND_OFS-XSI_PSR_I_ADDR_OFS)
+ mov r20=1
+ ;;
+ ld4 r30=[r28]
+ ;;
+ cmp.ne isXen,isRaw=r0,r30
+ ;;
+(isRaw) rsm psr.be | psr.i
+ BRL_COND_XEN_RSM_BE_I(isXen)
+ .global .vdso_rsm_be_i_ret
+.vdso_rsm_be_i_ret:
+#else
rsm psr.be | psr.i // M2 (5 cyc to srlz.d)
+#endif
LOAD_FSYSCALL_TABLE(r14) // X
;;
mov r16=IA64_KR(CURRENT) // M2 (12 cyc)
@@ -85,7 +166,14 @@ GLOBAL_ENTRY(__kernel_syscall_via_epc)
mov r19=NR_syscalls-1 // A
;;
lfetch [r18] // M0|1
+#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
+(isRaw) mov r29=psr
+ BRL_COND_XEN_GET_PSR(isXen)
+ .global .vdso_get_psr_ret
+.vdso_get_psr_ret:
+#else
mov r29=psr // M2 (12 cyc)
+#endif
// If r17 is a NaT, p6 will be zero
cmp.geu p6,p7=r19,r17 // A (sysnr > 0 && sysnr <
1024+NR_syscalls)?
;;
@@ -99,9 +187,21 @@ 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
+ ;;
+ // 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:
+#else
nop.i 0
;;
(p8) ssm psr.i
+#endif
(p6) mov b7=r18 // I0
(p8) br.dptk.many b7 // B
@@ -122,9 +222,21 @@ GLOBAL_ENTRY(__kernel_syscall_via_epc)
#else
BRL_COND_FSYS_BUBBLE_DOWN(p6)
#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:
+#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 614deef19299 -r 8d501f39286c
linux-2.6-xen-sparse/arch/ia64/kernel/gate.lds.S
--- a/linux-2.6-xen-sparse/arch/ia64/kernel/gate.lds.S Mon Jul 24 13:04:40
2006 -0600
+++ b/linux-2.6-xen-sparse/arch/ia64/kernel/gate.lds.S Mon Jul 24 13:43:35
2006 -0600
@@ -43,6 +43,28 @@ 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 = .;
+
+ __start_gate_brl_xen_rsm_be_i_patchlist = .;
+ *(.data.patch.brl_xen_rsm_be_i)
+ __end_gate_brl_xen_rsm_be_i_patchlist = .;
+
+ __start_gate_brl_xen_get_psr_patchlist = .;
+ *(.data.patch.brl_xen_get_psr)
+ __end_gate_brl_xen_get_psr_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*) }
.IA_64.unwind : { *(.IA_64.unwind*) }
:readable :unwind
diff -r 614deef19299 -r 8d501f39286c
linux-2.6-xen-sparse/arch/ia64/kernel/patch.c
--- a/linux-2.6-xen-sparse/arch/ia64/kernel/patch.c Mon Jul 24 13:04:40
2006 -0600
+++ b/linux-2.6-xen-sparse/arch/ia64/kernel/patch.c Mon Jul 24 13:43:35
2006 -0600
@@ -184,6 +184,73 @@ 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 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();
+}
+
+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_rsm_be_i);
+ EXTERN_PATCHLIST(xen_get_psr);
+ EXTERN_PATCHLIST(xen_ssm_i_0);
+ EXTERN_PATCHLIST(xen_ssm_i_1);
+
+ PATCH_BRL_SYMADDR(xen_rsm_be_i);
+ PATCH_BRL_SYMADDR(xen_get_psr);
+ 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
ia64_patch_gate (void)
{
@@ -192,6 +259,10 @@ ia64_patch_gate (void)
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));
+ patch_brl_in_vdso();
+#endif
ia64_patch_vtop(START(vtop), END(vtop));
ia64_patch_mckinley_e9(START(mckinley_e9), END(mckinley_e9));
}
diff -r 614deef19299 -r 8d501f39286c
linux-2.6-xen-sparse/arch/ia64/xen/hypercall.S
--- a/linux-2.6-xen-sparse/arch/ia64/xen/hypercall.S Mon Jul 24 13:04:40
2006 -0600
+++ b/linux-2.6-xen-sparse/arch/ia64/xen/hypercall.S Mon Jul 24 13:43:35
2006 -0600
@@ -351,3 +351,59 @@ GLOBAL_ENTRY(xen_send_ipi)
br.ret.sptk.many rp
;;
END(xen_send_ipi)
+
+#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
+// Those are vdso specialized.
+// In fsys mode, call, ret can't be used.
+GLOBAL_ENTRY(xen_rsm_be_i)
+ ld8 r22=[r22]
+ ;;
+ st1 [r22]=r20
+ st4 [r23]=r0
+ XEN_HYPER_RSM_BE
+ st4 [r23]=r20
+ brl.cond.sptk .vdso_rsm_be_i_ret
+ ;;
+END(xen_rsm_be_i)
+
+GLOBAL_ENTRY(xen_get_psr)
+ mov r31=r8
+ mov r25=IA64_PSR_IC
+ st4 [r23]=r0
+ XEN_HYPER_GET_PSR
+ ;;
+ st4 [r23]=r20
+ or r29=r8,r25 // vpsr.ic was cleared for hyperprivop
+ mov r8=r31
+ brl.cond.sptk .vdso_get_psr_ret
+ ;;
+END(xen_get_psr)
+
+GLOBAL_ENTRY(xen_ssm_i_0)
+ st4 [r22]=r20
+ ld4 r25=[r24]
+ ;;
+ cmp.ne.unc p11,p0=r0, r25
+ ;;
+(p11) st4 [r22]=r0
+(p11) st4 [r23]=r0
+(p11) XEN_HYPER_SSM_I
+
+ brl.cond.sptk .vdso_ssm_i_0_ret
+ ;;
+END(xen_ssm_i_0)
+
+GLOBAL_ENTRY(xen_ssm_i_1)
+ st4 [r22]=r20
+ ld4 r25=[r24]
+ ;;
+ cmp.ne.unc p11,p0=r0, r25
+ ;;
+(p11) st4 [r22]=r0
+(p11) st4 [r23]=r0
+(p11) XEN_HYPER_SSM_I
+ ;;
+ brl.cond.sptk .vdso_ssm_i_1_ret
+ ;;
+END(xen_ssm_i_1)
+#endif
diff -r 614deef19299 -r 8d501f39286c
linux-2.6-xen-sparse/include/asm-ia64/xen/privop.h
--- a/linux-2.6-xen-sparse/include/asm-ia64/xen/privop.h Mon Jul 24
13:04:40 2006 -0600
+++ b/linux-2.6-xen-sparse/include/asm-ia64/xen/privop.h Mon Jul 24
13:43:35 2006 -0600
@@ -48,6 +48,8 @@
#define XEN_HYPER_GET_PMD break HYPERPRIVOP_GET_PMD
#define XEN_HYPER_GET_EFLAG break HYPERPRIVOP_GET_EFLAG
#define XEN_HYPER_SET_EFLAG break HYPERPRIVOP_SET_EFLAG
+#define XEN_HYPER_RSM_BE break HYPERPRIVOP_RSM_BE
+#define XEN_HYPER_GET_PSR break HYPERPRIVOP_GET_PSR
#define XSI_IFS (XSI_BASE + XSI_IFS_OFS)
#define XSI_PRECOVER_IFS (XSI_BASE + XSI_PRECOVER_IFS_OFS)
diff -r 614deef19299 -r 8d501f39286c xen/arch/ia64/xen/privop.c
--- a/xen/arch/ia64/xen/privop.c Mon Jul 24 13:04:40 2006 -0600
+++ b/xen/arch/ia64/xen/privop.c Mon Jul 24 13:43:35 2006 -0600
@@ -789,6 +789,13 @@ ia64_hyperprivop(unsigned long iim, REGS
case HYPERPRIVOP_SET_EFLAG:
(void)vcpu_set_ar(v,24,regs->r8);
return 1;
+ case HYPERPRIVOP_RSM_BE:
+ (void)vcpu_reset_psr_sm(v, IA64_PSR_BE);
+ return 1;
+ case HYPERPRIVOP_GET_PSR:
+ (void)vcpu_get_psr(v, &val);
+ regs->r8 = val;
+ return 1;
}
return 0;
}
diff -r 614deef19299 -r 8d501f39286c xen/include/public/arch-ia64.h
--- a/xen/include/public/arch-ia64.h Mon Jul 24 13:04:40 2006 -0600
+++ b/xen/include/public/arch-ia64.h Mon Jul 24 13:43:35 2006 -0600
@@ -420,7 +420,9 @@ struct xen_ia64_boot_param {
#define HYPERPRIVOP_GET_PMD 0x15
#define HYPERPRIVOP_GET_EFLAG 0x16
#define HYPERPRIVOP_SET_EFLAG 0x17
-#define HYPERPRIVOP_MAX 0x17
+#define HYPERPRIVOP_RSM_BE 0x18
+#define HYPERPRIVOP_GET_PSR 0x19
+#define HYPERPRIVOP_MAX 0x19
#endif /* __HYPERVISOR_IF_IA64_H__ */
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