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ia64/pv_ops: add hooks to paravirtualize fsyscall implementation.

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Add two hooks, paravirt_get_fsyscall_table() and
paravirt_get_fsys_bubble_doen() to paravirtualize fsyscall implementation.
This patch just add the hooks fsyscall and don't paravirtualize it.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Isaku Yamahata 2009-03-04 21:05:34 +09:00 committed by Tony Luck
parent ac93925acb
commit dd97d5cb54
6 changed files with 54 additions and 14 deletions
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3
arch/ia64/include/asm/native/inst.h
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@ -30,6 +30,9 @@
#define __paravirt_work_processed_syscall_target \
ia64_work_processed_syscall
#define paravirt_fsyscall_table ia64_native_fsyscall_table
#define paravirt_fsys_bubble_down ia64_native_fsys_bubble_down
#ifdef CONFIG_PARAVIRT_GUEST_ASM_CLOBBER_CHECK
# define PARAVIRT_POISON 0xdeadbeefbaadf00d
# define CLOBBER(clob) \

15
arch/ia64/include/asm/paravirt.h
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@ -22,6 +22,21 @@
#ifndef __ASM_PARAVIRT_H
#define __ASM_PARAVIRT_H
#ifndef __ASSEMBLY__
/******************************************************************************
* fsys related addresses
*/
struct pv_fsys_data {
unsigned long *fsyscall_table;
void *fsys_bubble_down;
};
extern struct pv_fsys_data pv_fsys_data;
unsigned long *paravirt_get_fsyscall_table(void);
char *paravirt_get_fsys_bubble_down(void);
#endif
#ifdef CONFIG_PARAVIRT_GUEST
#define PARAVIRT_HYPERVISOR_TYPE_DEFAULT 0

4
arch/ia64/kernel/Makefile
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@ -111,9 +111,9 @@ include/asm-ia64/nr-irqs.h: arch/$(SRCARCH)/kernel/nr-irqs.s
clean-files += $(objtree)/include/asm-ia64/nr-irqs.h
#
# native ivt.S and entry.S
# native ivt.S, entry.S and fsys.S
#
ASM_PARAVIRT_OBJS = ivt.o entry.o
ASM_PARAVIRT_OBJS = ivt.o entry.o fsys.o
define paravirtualized_native
AFLAGS_$(1) += -D__IA64_ASM_PARAVIRTUALIZED_NATIVE
AFLAGS_pvchk-sed-$(1) += -D__IA64_ASM_PARAVIRTUALIZED_PVCHECK

17
arch/ia64/kernel/fsys.S
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@ -25,6 +25,7 @@
#include <asm/unistd.h>
#include "entry.h"
#include "paravirt_inst.h"
/*
* See Documentation/ia64/fsys.txt for details on fsyscalls.
@ -602,7 +603,7 @@ ENTRY(fsys_fallback_syscall)
mov r26=ar.pfs
END(fsys_fallback_syscall)
/* FALL THROUGH */
GLOBAL_ENTRY(fsys_bubble_down)
GLOBAL_ENTRY(paravirt_fsys_bubble_down)
.prologue
.altrp b6
.body
@ -640,7 +641,7 @@ GLOBAL_ENTRY(fsys_bubble_down)
*
* PSR.BE : already is turned off in __kernel_syscall_via_epc()
* PSR.AC : don't care (kernel normally turns PSR.AC on)
* PSR.I : already turned off by the time fsys_bubble_down gets
* PSR.I : already turned off by the time paravirt_fsys_bubble_down gets
* invoked
* PSR.DFL: always 0 (kernel never turns it on)
* PSR.DFH: don't care --- kernel never touches f32-f127 on its own
@ -650,7 +651,7 @@ GLOBAL_ENTRY(fsys_bubble_down)
* PSR.DB : don't care --- kernel never enables kernel-level
* breakpoints
* PSR.TB : must be 0 already; if it wasn't zero on entry to
* __kernel_syscall_via_epc, the branch to fsys_bubble_down
* __kernel_syscall_via_epc, the branch to paravirt_fsys_bubble_down
* will trigger a taken branch; the taken-trap-handler then
* converts the syscall into a break-based system-call.
*/
@ -741,14 +742,14 @@ GLOBAL_ENTRY(fsys_bubble_down)
nop.m 0
(p8) br.call.sptk.many b6=b6 // B (ignore return address)
br.cond.spnt ia64_trace_syscall // B
END(fsys_bubble_down)
END(paravirt_fsys_bubble_down)
.rodata
.align 8
.globl fsyscall_table
.globl paravirt_fsyscall_table
data8 fsys_bubble_down
fsyscall_table:
data8 paravirt_fsys_bubble_down
paravirt_fsyscall_table:
data8 fsys_ni_syscall
data8 0 // exit // 1025
data8 0 // read
@ -1033,4 +1034,4 @@ fsyscall_table:
// fill in zeros for the remaining entries
.zero:
.space fsyscall_table + 8*NR_syscalls - .zero, 0
.space paravirt_fsyscall_table + 8*NR_syscalls - .zero, 0

26
arch/ia64/kernel/patch.c
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@ -7,6 +7,7 @@
#include <linux/init.h>
#include <linux/string.h>
#include <asm/paravirt.h>
#include <asm/patch.h>
#include <asm/processor.h>
#include <asm/sections.h>
@ -169,16 +170,35 @@ ia64_patch_mckinley_e9 (unsigned long start, unsigned long end)
ia64_srlz_i();
}
extern unsigned long ia64_native_fsyscall_table[NR_syscalls];
extern char ia64_native_fsys_bubble_down[];
struct pv_fsys_data pv_fsys_data __initdata = {
.fsyscall_table = (unsigned long *)ia64_native_fsyscall_table,
.fsys_bubble_down = (void *)ia64_native_fsys_bubble_down,
};
unsigned long * __init
paravirt_get_fsyscall_table(void)
{
return pv_fsys_data.fsyscall_table;
}
char * __init
paravirt_get_fsys_bubble_down(void)
{
return pv_fsys_data.fsys_bubble_down;
}
static void __init
patch_fsyscall_table (unsigned long start, unsigned long end)
{
extern unsigned long fsyscall_table[NR_syscalls];
u64 fsyscall_table = (u64)paravirt_get_fsyscall_table();
s32 *offp = (s32 *) start;
u64 ip;
while (offp < (s32 *) end) {
ip = (u64) ia64_imva((char *) offp + *offp);
ia64_patch_imm64(ip, (u64) fsyscall_table);
ia64_patch_imm64(ip, fsyscall_table);
ia64_fc((void *) ip);
++offp;
}
@ -189,7 +209,7 @@ patch_fsyscall_table (unsigned long start, unsigned long end)
static void __init
patch_brl_fsys_bubble_down (unsigned long start, unsigned long end)
{
extern char fsys_bubble_down[];
u64 fsys_bubble_down = (u64)paravirt_get_fsys_bubble_down();
s32 *offp = (s32 *) start;
u64 ip;

3
arch/ia64/mm/init.c
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@ -35,6 +35,7 @@
#include <asm/uaccess.h>
#include <asm/unistd.h>
#include <asm/mca.h>
#include <asm/paravirt.h>
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
@ -667,8 +668,8 @@ mem_init (void)
* code can tell them apart.
*/
for (i = 0; i < NR_syscalls; ++i) {
extern unsigned long fsyscall_table[NR_syscalls];
extern unsigned long sys_call_table[NR_syscalls];
unsigned long *fsyscall_table = paravirt_get_fsyscall_table();
if (!fsyscall_table[i] || nolwsys)
fsyscall_table[i] = sys_call_table[i] | 1;