提交 603d1a50 编写于 作者: M Martin Schwidefsky

[S390] move sie code to entry.S

The entry to / exit from sie has subtle dependencies to the first level
interrupt handler. Move the sie assembler code to entry64.S and replace
the SIE_HOOK callback with a test and the new _TIF_SIE bit.
In addition this patch fixes several problems in regard to the check for
the_TIF_EXIT_SIE bits. The old code checked the TIF bits before executing
the interrupt handler and it only modified the instruction address if it
pointed directly to the sie instruction. In both cases it could miss
a TIF bit that normally would cause an exit from the guest and would
reenter the guest context.
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
上级 bb25b9ba
......@@ -94,6 +94,7 @@ static inline struct thread_info *current_thread_info(void)
#define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */
#define TIF_SECCOMP 10 /* secure computing */
#define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */
#define TIF_SIE 12 /* guest execution active */
#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling
TIF_NEED_RESCHED */
#define TIF_31BIT 17 /* 32bit process */
......@@ -113,6 +114,7 @@ static inline struct thread_info *current_thread_info(void)
#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP (1<<TIF_SECCOMP)
#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
#define _TIF_SIE (1<<TIF_SIE)
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
#define _TIF_31BIT (1<<TIF_31BIT)
#define _TIF_SINGLE_STEP (1<<TIF_FREEZE)
......
......@@ -56,15 +56,28 @@ _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
_TIF_MCCK_PENDING)
_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \
_TIF_SECCOMP>>8 | _TIF_SYSCALL_TRACEPOINT>>8)
_TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
#define BASED(name) name-system_call(%r13)
.macro SPP newpp
#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_SPP
jz .+8
.insn s,0xb2800000,\newpp
#endif
.endm
.macro HANDLE_SIE_INTERCEPT
#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
lg %r3,__LC_SIE_HOOK
ltgr %r3,%r3
tm __TI_flags+6(%r12),_TIF_SIE>>8
jz 0f
basr %r14,%r3
SPP __LC_CMF_HPP # set host id
clc SP_PSW+8(8,%r15),BASED(.Lsie_loop)
jl 0f
clc SP_PSW+8(8,%r15),BASED(.Lsie_done)
jhe 0f
mvc SP_PSW+8(8,%r15),BASED(.Lsie_loop)
0:
#endif
.endm
......@@ -465,6 +478,7 @@ pgm_check_handler:
xc SP_ILC(4,%r15),SP_ILC(%r15)
mvc SP_PSW(16,%r15),__LC_PGM_OLD_PSW
lg %r12,__LC_THREAD_INFO # load pointer to thread_info struct
HANDLE_SIE_INTERCEPT
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
jz pgm_no_vtime
UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
......@@ -472,7 +486,6 @@ pgm_check_handler:
mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
LAST_BREAK
pgm_no_vtime:
HANDLE_SIE_INTERCEPT
stg %r11,SP_ARGS(%r15)
lgf %r3,__LC_PGM_ILC # load program interruption code
lg %r4,__LC_TRANS_EXC_CODE
......@@ -507,6 +520,7 @@ pgm_per_std:
CREATE_STACK_FRAME __LC_SAVE_AREA
mvc SP_PSW(16,%r15),__LC_PGM_OLD_PSW
lg %r12,__LC_THREAD_INFO # load pointer to thread_info struct
HANDLE_SIE_INTERCEPT
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
jz pgm_no_vtime2
UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
......@@ -514,7 +528,6 @@ pgm_per_std:
mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
LAST_BREAK
pgm_no_vtime2:
HANDLE_SIE_INTERCEPT
lg %r1,__TI_task(%r12)
tm SP_PSW+1(%r15),0x01 # kernel per event ?
jz kernel_per
......@@ -579,6 +592,7 @@ io_int_handler:
CREATE_STACK_FRAME __LC_SAVE_AREA+40
mvc SP_PSW(16,%r15),0(%r12) # move user PSW to stack
lg %r12,__LC_THREAD_INFO # load pointer to thread_info struct
HANDLE_SIE_INTERCEPT
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
jz io_no_vtime
UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
......@@ -586,7 +600,6 @@ io_int_handler:
mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
LAST_BREAK
io_no_vtime:
HANDLE_SIE_INTERCEPT
TRACE_IRQS_OFF
la %r2,SP_PTREGS(%r15) # address of register-save area
brasl %r14,do_IRQ # call standard irq handler
......@@ -714,6 +727,7 @@ ext_int_handler:
CREATE_STACK_FRAME __LC_SAVE_AREA+40
mvc SP_PSW(16,%r15),0(%r12) # move user PSW to stack
lg %r12,__LC_THREAD_INFO # load pointer to thread_info struct
HANDLE_SIE_INTERCEPT
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
jz ext_no_vtime
UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
......@@ -721,7 +735,6 @@ ext_int_handler:
mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
LAST_BREAK
ext_no_vtime:
HANDLE_SIE_INTERCEPT
TRACE_IRQS_OFF
lghi %r1,4096
la %r2,SP_PTREGS(%r15) # address of register-save area
......@@ -785,6 +798,7 @@ mcck_int_main:
lg %r12,__LC_THREAD_INFO # load pointer to thread_info struct
tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid?
jno mcck_no_vtime # no -> no timer update
HANDLE_SIE_INTERCEPT
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
jz mcck_no_vtime
UPDATE_VTIME __LC_EXIT_TIMER,__LC_MCCK_ENTER_TIMER,__LC_USER_TIMER
......@@ -804,7 +818,6 @@ mcck_no_vtime:
stosm __SF_EMPTY(%r15),0x04 # turn dat on
tm __TI_flags+7(%r12),_TIF_MCCK_PENDING
jno mcck_return
HANDLE_SIE_INTERCEPT
TRACE_IRQS_OFF
brasl %r14,s390_handle_mcck
TRACE_IRQS_ON
......@@ -1036,6 +1049,57 @@ cleanup_io_restore_insn:
.Lcritical_end:
.quad __critical_end
#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
/*
* sie64a calling convention:
* %r2 pointer to sie control block
* %r3 guest register save area
*/
.globl sie64a
sie64a:
stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers
stg %r2,__SF_EMPTY(%r15) # save control block pointer
stg %r3,__SF_EMPTY+8(%r15) # save guest register save area
lmg %r0,%r13,0(%r3) # load guest gprs 0-13
lg %r14,__LC_THREAD_INFO # pointer thread_info struct
oi __TI_flags+6(%r14),_TIF_SIE>>8
sie_loop:
lg %r14,__LC_THREAD_INFO # pointer thread_info struct
tm __TI_flags+7(%r14),_TIF_EXIT_SIE
jnz sie_exit
lg %r14,__SF_EMPTY(%r15) # get control block pointer
SPP __SF_EMPTY(%r15) # set guest id
sie 0(%r14)
sie_done:
SPP __LC_CMF_HPP # set host id
lg %r14,__LC_THREAD_INFO # pointer thread_info struct
sie_exit:
ni __TI_flags+6(%r14),255-(_TIF_SIE>>8)
lg %r14,__SF_EMPTY+8(%r15) # load guest register save area
stmg %r0,%r13,0(%r14) # save guest gprs 0-13
lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers
lghi %r2,0
br %r14
sie_fault:
lg %r14,__LC_THREAD_INFO # pointer thread_info struct
ni __TI_flags+6(%r14),255-(_TIF_SIE>>8)
lg %r14,__SF_EMPTY+8(%r15) # load guest register save area
stmg %r0,%r13,0(%r14) # save guest gprs 0-13
lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers
lghi %r2,-EFAULT
br %r14
.align 8
.Lsie_loop:
.quad sie_loop
.Lsie_done:
.quad sie_done
.section __ex_table,"a"
.quad sie_loop,sie_fault
.previous
#endif
.section .rodata, "a"
#define SYSCALL(esa,esame,emu) .long esame
.globl sys_call_table
......
#include <linux/module.h>
#include <linux/kvm_host.h>
#include <asm/ftrace.h>
#ifdef CONFIG_FUNCTION_TRACER
EXPORT_SYMBOL(_mcount);
#endif
#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
EXPORT_SYMBOL(sie64a);
#endif
......@@ -10,5 +10,5 @@ common-objs = $(addprefix ../../../virt/kvm/, kvm_main.o)
ccflags-y := -Ivirt/kvm -Iarch/s390/kvm
kvm-objs := $(common-objs) kvm-s390.o sie64a.o intercept.o interrupt.o priv.o sigp.o diag.o
kvm-objs := $(common-objs) kvm-s390.o intercept.o interrupt.o priv.o sigp.o diag.o
obj-$(CONFIG_KVM) += kvm.o
/*
* sie64a.S - low level sie call
*
* Copyright IBM Corp. 2008,2010
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (version 2 only)
* as published by the Free Software Foundation.
*
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
* Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
*/
#include <linux/errno.h>
#include <asm/asm-offsets.h>
#include <asm/setup.h>
#include <asm/asm-offsets.h>
#include <asm/ptrace.h>
#include <asm/thread_info.h>
_TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
/*
* offsets into stackframe
* SP_ = offsets into stack sie64 is called with
* SPI_ = offsets into irq stack
*/
SP_GREGS = __SF_EMPTY
SP_HOOK = __SF_EMPTY+8
SP_GPP = __SF_EMPTY+16
SPI_PSW = STACK_FRAME_OVERHEAD + __PT_PSW
.macro SPP newpp
tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_SPP
jz 0f
.insn s,0xb2800000,\newpp
0:
.endm
sie_irq_handler:
SPP __LC_CMF_HPP # set host id
larl %r2,sie_inst
clg %r2,SPI_PSW+8(0,%r15) # intercepted sie
jne 1f
xc __LC_SIE_HOOK(8),__LC_SIE_HOOK
lg %r2,__LC_THREAD_INFO # pointer thread_info struct
tm __TI_flags+7(%r2),_TIF_EXIT_SIE
jz 0f
larl %r2,sie_exit # work pending, leave sie
stg %r2,SPI_PSW+8(0,%r15)
br %r14
0: larl %r2,sie_reenter # re-enter with guest id
stg %r2,SPI_PSW+8(0,%r15)
1: br %r14
/*
* sie64a calling convention:
* %r2 pointer to sie control block
* %r3 guest register save area
*/
.globl sie64a
sie64a:
stg %r3,SP_GREGS(%r15) # save guest register save area
stmg %r6,%r14,__SF_GPRS(%r15) # save registers on entry
lgr %r14,%r2 # pointer to sie control block
larl %r5,sie_irq_handler
stg %r2,SP_GPP(%r15)
stg %r5,SP_HOOK(%r15) # save hook target
lmg %r0,%r13,0(%r3) # load guest gprs 0-13
sie_reenter:
mvc __LC_SIE_HOOK(8),SP_HOOK(%r15)
SPP SP_GPP(%r15) # set guest id
sie_inst:
sie 0(%r14)
xc __LC_SIE_HOOK(8),__LC_SIE_HOOK
SPP __LC_CMF_HPP # set host id
sie_exit:
lg %r14,SP_GREGS(%r15)
stmg %r0,%r13,0(%r14) # save guest gprs 0-13
lghi %r2,0
lmg %r6,%r14,__SF_GPRS(%r15)
br %r14
sie_err:
xc __LC_SIE_HOOK(8),__LC_SIE_HOOK
SPP __LC_CMF_HPP # set host id
lg %r14,SP_GREGS(%r15)
stmg %r0,%r13,0(%r14) # save guest gprs 0-13
lghi %r2,-EFAULT
lmg %r6,%r14,__SF_GPRS(%r15)
br %r14
.section __ex_table,"a"
.quad sie_inst,sie_err
.quad sie_exit,sie_err
.quad sie_reenter,sie_err
.previous
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