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authorLinus Torvalds <torvalds@linux-foundation.org>2008-05-08 10:47:39 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-05-08 10:47:39 -0700
commitda1ba891f22835db9a2c349315c3763e9f4e4e67 (patch)
tree958c53bfbe540c14370709d64c538e5c3f6cff2b /arch
parent8b2cc917a02936c3ea7d8da46801c7b7b6233093 (diff)
parent45e576b1c3d0020607b8666c0247164e92c7d719 (diff)
Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6
* 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6: [S390] guest page hinting light [S390] tty3270: fix put_char fail/success conversion. [S390] compat ptrace cleanup [S390] s390mach compile warning [S390] cio: Fix parsing mechanism for blacklisted devices. [S390] cio: Remove cio_msg kernel parameter. [S390] s390-kvm: leave sie context on work. Removes preemption requirement [S390] s390: Optimize user and work TIF check
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/Kconfig7
-rw-r--r--arch/s390/kernel/compat_wrapper.S2
-rw-r--r--arch/s390/kernel/entry.S29
-rw-r--r--arch/s390/kernel/entry64.S57
-rw-r--r--arch/s390/kernel/ptrace.c100
-rw-r--r--arch/s390/kvm/Kconfig1
-rw-r--r--arch/s390/kvm/intercept.c3
-rw-r--r--arch/s390/kvm/kvm-s390.c5
-rw-r--r--arch/s390/mm/Makefile1
-rw-r--r--arch/s390/mm/init.c3
-rw-r--r--arch/s390/mm/page-states.c79
11 files changed, 157 insertions, 130 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 29a7940f284f..1d035082e78e 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -430,6 +430,13 @@ config CMM_IUCV
Select this option to enable the special message interface to
the cooperative memory management.
+config PAGE_STATES
+ bool "Unused page notification"
+ help
+ This enables the notification of unused pages to the
+ hypervisor. The ESSA instruction is used to do the states
+ changes between a page that has content and the unused state.
+
config VIRT_TIMER
bool "Virtual CPU timer support"
help
diff --git a/arch/s390/kernel/compat_wrapper.S b/arch/s390/kernel/compat_wrapper.S
index 743d54f0b8db..d003a6e16afb 100644
--- a/arch/s390/kernel/compat_wrapper.S
+++ b/arch/s390/kernel/compat_wrapper.S
@@ -121,7 +121,7 @@ sys32_ptrace_wrapper:
lgfr %r3,%r3 # long
llgtr %r4,%r4 # long
llgfr %r5,%r5 # long
- jg sys_ptrace # branch to system call
+ jg compat_sys_ptrace # branch to system call
.globl sys32_alarm_wrapper
sys32_alarm_wrapper:
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index bdbb3bcd78a5..708cf9cf9a35 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -279,8 +279,6 @@ sysc_do_restart:
st %r2,SP_R2(%r15) # store return value (change R2 on stack)
sysc_return:
- tm SP_PSW+1(%r15),0x01 # returning to user ?
- bno BASED(sysc_restore)
tm __TI_flags+3(%r9),_TIF_WORK_SVC
bnz BASED(sysc_work) # there is work to do (signals etc.)
sysc_restore:
@@ -312,6 +310,8 @@ sysc_work_loop:
# One of the work bits is on. Find out which one.
#
sysc_work:
+ tm SP_PSW+1(%r15),0x01 # returning to user ?
+ bno BASED(sysc_restore)
tm __TI_flags+3(%r9),_TIF_MCCK_PENDING
bo BASED(sysc_mcck_pending)
tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
@@ -602,12 +602,6 @@ io_no_vtime:
la %r2,SP_PTREGS(%r15) # address of register-save area
basr %r14,%r1 # branch to standard irq handler
io_return:
- tm SP_PSW+1(%r15),0x01 # returning to user ?
-#ifdef CONFIG_PREEMPT
- bno BASED(io_preempt) # no -> check for preemptive scheduling
-#else
- bno BASED(io_restore) # no-> skip resched & signal
-#endif
tm __TI_flags+3(%r9),_TIF_WORK_INT
bnz BASED(io_work) # there is work to do (signals etc.)
io_restore:
@@ -629,10 +623,18 @@ io_restore_trace_psw:
.long 0, io_restore_trace + 0x80000000
#endif
-#ifdef CONFIG_PREEMPT
-io_preempt:
+#
+# switch to kernel stack, then check the TIF bits
+#
+io_work:
+ tm SP_PSW+1(%r15),0x01 # returning to user ?
+#ifndef CONFIG_PREEMPT
+ bno BASED(io_restore) # no-> skip resched & signal
+#else
+ bnz BASED(io_work_user) # no -> check for preemptive scheduling
+ # check for preemptive scheduling
icm %r0,15,__TI_precount(%r9)
- bnz BASED(io_restore)
+ bnz BASED(io_restore) # preemption disabled
l %r1,SP_R15(%r15)
s %r1,BASED(.Lc_spsize)
mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
@@ -646,10 +648,7 @@ io_resume_loop:
br %r1 # call schedule
#endif
-#
-# switch to kernel stack, then check the TIF bits
-#
-io_work:
+io_work_user:
l %r1,__LC_KERNEL_STACK
s %r1,BASED(.Lc_spsize)
mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index 5a4a7bcd2bba..fee10177dbfc 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -271,8 +271,6 @@ sysc_noemu:
stg %r2,SP_R2(%r15) # store return value (change R2 on stack)
sysc_return:
- tm SP_PSW+1(%r15),0x01 # returning to user ?
- jno sysc_restore
tm __TI_flags+7(%r9),_TIF_WORK_SVC
jnz sysc_work # there is work to do (signals etc.)
sysc_restore:
@@ -304,6 +302,8 @@ sysc_work_loop:
# One of the work bits is on. Find out which one.
#
sysc_work:
+ tm SP_PSW+1(%r15),0x01 # returning to user ?
+ jno sysc_restore
tm __TI_flags+7(%r9),_TIF_MCCK_PENDING
jo sysc_mcck_pending
tm __TI_flags+7(%r9),_TIF_NEED_RESCHED
@@ -585,12 +585,6 @@ io_no_vtime:
la %r2,SP_PTREGS(%r15) # address of register-save area
brasl %r14,do_IRQ # call standard irq handler
io_return:
- tm SP_PSW+1(%r15),0x01 # returning to user ?
-#ifdef CONFIG_PREEMPT
- jno io_preempt # no -> check for preemptive scheduling
-#else
- jno io_restore # no-> skip resched & signal
-#endif
tm __TI_flags+7(%r9),_TIF_WORK_INT
jnz io_work # there is work to do (signals etc.)
io_restore:
@@ -612,10 +606,41 @@ io_restore_trace_psw:
.quad 0, io_restore_trace
#endif
-#ifdef CONFIG_PREEMPT
-io_preempt:
+#
+# There is work todo, we need to check if we return to userspace, then
+# check, if we are in SIE, if yes leave it
+#
+io_work:
+ tm SP_PSW+1(%r15),0x01 # returning to user ?
+#ifndef CONFIG_PREEMPT
+#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
+ jnz io_work_user # yes -> no need to check for SIE
+ la %r1, BASED(sie_opcode) # we return to kernel here
+ lg %r2, SP_PSW+8(%r15)
+ clc 0(2,%r1), 0(%r2) # is current instruction = SIE?
+ jne io_restore # no-> return to kernel
+ lg %r1, SP_PSW+8(%r15) # yes-> add 4 bytes to leave SIE
+ aghi %r1, 4
+ stg %r1, SP_PSW+8(%r15)
+ j io_restore # return to kernel
+#else
+ jno io_restore # no-> skip resched & signal
+#endif
+#else
+ jnz io_work_user # yes -> do resched & signal
+#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
+ la %r1, BASED(sie_opcode)
+ lg %r2, SP_PSW+8(%r15)
+ clc 0(2,%r1), 0(%r2) # is current instruction = SIE?
+ jne 0f # no -> leave PSW alone
+ lg %r1, SP_PSW+8(%r15) # yes-> add 4 bytes to leave SIE
+ aghi %r1, 4
+ stg %r1, SP_PSW+8(%r15)
+0:
+#endif
+ # check for preemptive scheduling
icm %r0,15,__TI_precount(%r9)
- jnz io_restore
+ jnz io_restore # preemption is disabled
# switch to kernel stack
lg %r1,SP_R15(%r15)
aghi %r1,-SP_SIZE
@@ -629,10 +654,7 @@ io_resume_loop:
jg preempt_schedule_irq
#endif
-#
-# switch to kernel stack, then check TIF bits
-#
-io_work:
+io_work_user:
lg %r1,__LC_KERNEL_STACK
aghi %r1,-SP_SIZE
mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
@@ -653,6 +675,11 @@ io_work_loop:
j io_restore
io_work_done:
+#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
+sie_opcode:
+ .long 0xb2140000
+#endif
+
#
# _TIF_MCCK_PENDING is set, call handler
#
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index 7f4270163744..35827b9bd4d1 100644
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -292,8 +292,7 @@ poke_user(struct task_struct *child, addr_t addr, addr_t data)
return 0;
}
-static int
-do_ptrace_normal(struct task_struct *child, long request, long addr, long data)
+long arch_ptrace(struct task_struct *child, long request, long addr, long data)
{
ptrace_area parea;
int copied, ret;
@@ -529,35 +528,19 @@ poke_user_emu31(struct task_struct *child, addr_t addr, addr_t data)
return 0;
}
-static int
-do_ptrace_emu31(struct task_struct *child, long request, long addr, long data)
+long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
+ compat_ulong_t caddr, compat_ulong_t cdata)
{
- unsigned int tmp; /* 4 bytes !! */
+ unsigned long addr = caddr;
+ unsigned long data = cdata;
ptrace_area_emu31 parea;
int copied, ret;
switch (request) {
- case PTRACE_PEEKTEXT:
- case PTRACE_PEEKDATA:
- /* read word at location addr. */
- copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
- if (copied != sizeof(tmp))
- return -EIO;
- return put_user(tmp, (unsigned int __force __user *) data);
-
case PTRACE_PEEKUSR:
/* read the word at location addr in the USER area. */
return peek_user_emu31(child, addr, data);
- case PTRACE_POKETEXT:
- case PTRACE_POKEDATA:
- /* write the word at location addr. */
- tmp = data;
- copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 1);
- if (copied != sizeof(tmp))
- return -EIO;
- return 0;
-
case PTRACE_POKEUSR:
/* write the word at location addr in the USER area */
return poke_user_emu31(child, addr, data);
@@ -587,82 +570,11 @@ do_ptrace_emu31(struct task_struct *child, long request, long addr, long data)
copied += sizeof(unsigned int);
}
return 0;
- case PTRACE_GETEVENTMSG:
- return put_user((__u32) child->ptrace_message,
- (unsigned int __force __user *) data);
- case PTRACE_GETSIGINFO:
- if (child->last_siginfo == NULL)
- return -EINVAL;
- return copy_siginfo_to_user32((compat_siginfo_t
- __force __user *) data,
- child->last_siginfo);
- case PTRACE_SETSIGINFO:
- if (child->last_siginfo == NULL)
- return -EINVAL;
- return copy_siginfo_from_user32(child->last_siginfo,
- (compat_siginfo_t
- __force __user *) data);
}
- return ptrace_request(child, request, addr, data);
+ return compat_ptrace_request(child, request, addr, data);
}
#endif
-long arch_ptrace(struct task_struct *child, long request, long addr, long data)
-{
- switch (request) {
- case PTRACE_SYSCALL:
- /* continue and stop at next (return from) syscall */
- case PTRACE_CONT:
- /* restart after signal. */
- if (!valid_signal(data))
- return -EIO;
- if (request == PTRACE_SYSCALL)
- set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- else
- clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- child->exit_code = data;
- /* make sure the single step bit is not set. */
- user_disable_single_step(child);
- wake_up_process(child);
- return 0;
-
- case PTRACE_KILL:
- /*
- * make the child exit. Best I can do is send it a sigkill.
- * perhaps it should be put in the status that it wants to
- * exit.
- */
- if (child->exit_state == EXIT_ZOMBIE) /* already dead */
- return 0;
- child->exit_code = SIGKILL;
- /* make sure the single step bit is not set. */
- user_disable_single_step(child);
- wake_up_process(child);
- return 0;
-
- case PTRACE_SINGLESTEP:
- /* set the trap flag. */
- if (!valid_signal(data))
- return -EIO;
- clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- child->exit_code = data;
- user_enable_single_step(child);
- /* give it a chance to run. */
- wake_up_process(child);
- return 0;
-
- /* Do requests that differ for 31/64 bit */
- default:
-#ifdef CONFIG_COMPAT
- if (test_thread_flag(TIF_31BIT))
- return do_ptrace_emu31(child, request, addr, data);
-#endif
- return do_ptrace_normal(child, request, addr, data);
- }
- /* Not reached. */
- return -EIO;
-}
-
asmlinkage void
syscall_trace(struct pt_regs *regs, int entryexit)
{
diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig
index 1761b74d639b..e051cad1f1e0 100644
--- a/arch/s390/kvm/Kconfig
+++ b/arch/s390/kvm/Kconfig
@@ -22,7 +22,6 @@ config KVM
select PREEMPT_NOTIFIERS
select ANON_INODES
select S390_SWITCH_AMODE
- select PREEMPT
---help---
Support hosting paravirtualized guest machines using the SIE
virtualization capability on the mainframe. This should work
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
index 349581a26103..47a0b642174c 100644
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -105,6 +105,9 @@ static intercept_handler_t instruction_handlers[256] = {
static int handle_noop(struct kvm_vcpu *vcpu)
{
switch (vcpu->arch.sie_block->icptcode) {
+ case 0x0:
+ vcpu->stat.exit_null++;
+ break;
case 0x10:
vcpu->stat.exit_external_request++;
break;
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 98d1e73e01f1..0ac36a649eba 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -31,6 +31,7 @@
struct kvm_stats_debugfs_item debugfs_entries[] = {
{ "userspace_handled", VCPU_STAT(exit_userspace) },
+ { "exit_null", VCPU_STAT(exit_null) },
{ "exit_validity", VCPU_STAT(exit_validity) },
{ "exit_stop_request", VCPU_STAT(exit_stop_request) },
{ "exit_external_request", VCPU_STAT(exit_external_request) },
@@ -221,10 +222,6 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
vcpu->arch.guest_fpregs.fpc &= FPC_VALID_MASK;
restore_fp_regs(&vcpu->arch.guest_fpregs);
restore_access_regs(vcpu->arch.guest_acrs);
-
- if (signal_pending(current))
- atomic_set_mask(CPUSTAT_STOP_INT,
- &vcpu->arch.sie_block->cpuflags);
}
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
diff --git a/arch/s390/mm/Makefile b/arch/s390/mm/Makefile
index fb988a48a754..2a7458134544 100644
--- a/arch/s390/mm/Makefile
+++ b/arch/s390/mm/Makefile
@@ -5,3 +5,4 @@
obj-y := init.o fault.o extmem.o mmap.o vmem.o pgtable.o
obj-$(CONFIG_CMM) += cmm.o
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
+obj-$(CONFIG_PAGE_STATES) += page-states.o
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index fa31de6ae97a..29f3a63806b9 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -126,6 +126,9 @@ void __init mem_init(void)
/* clear the zero-page */
memset(empty_zero_page, 0, PAGE_SIZE);
+ /* Setup guest page hinting */
+ cmma_init();
+
/* this will put all low memory onto the freelists */
totalram_pages += free_all_bootmem();
diff --git a/arch/s390/mm/page-states.c b/arch/s390/mm/page-states.c
new file mode 100644
index 000000000000..fc0ad73ffd90
--- /dev/null
+++ b/arch/s390/mm/page-states.c
@@ -0,0 +1,79 @@
+/*
+ * arch/s390/mm/page-states.c
+ *
+ * Copyright IBM Corp. 2008
+ *
+ * Guest page hinting for unused pages.
+ *
+ * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+
+#define ESSA_SET_STABLE 1
+#define ESSA_SET_UNUSED 2
+
+static int cmma_flag;
+
+static int __init cmma(char *str)
+{
+ char *parm;
+ parm = strstrip(str);
+ if (strcmp(parm, "yes") == 0 || strcmp(parm, "on") == 0) {
+ cmma_flag = 1;
+ return 1;
+ }
+ cmma_flag = 0;
+ if (strcmp(parm, "no") == 0 || strcmp(parm, "off") == 0)
+ return 1;
+ return 0;
+}
+
+__setup("cmma=", cmma);
+
+void __init cmma_init(void)
+{
+ register unsigned long tmp asm("0") = 0;
+ register int rc asm("1") = -EOPNOTSUPP;
+
+ if (!cmma_flag)
+ return;
+ asm volatile(
+ " .insn rrf,0xb9ab0000,%1,%1,0,0\n"
+ "0: la %0,0\n"
+ "1:\n"
+ EX_TABLE(0b,1b)
+ : "+&d" (rc), "+&d" (tmp));
+ if (rc)
+ cmma_flag = 0;
+}
+
+void arch_free_page(struct page *page, int order)
+{
+ int i, rc;
+
+ if (!cmma_flag)
+ return;
+ for (i = 0; i < (1 << order); i++)
+ asm volatile(".insn rrf,0xb9ab0000,%0,%1,%2,0"
+ : "=&d" (rc)
+ : "a" ((page_to_pfn(page) + i) << PAGE_SHIFT),
+ "i" (ESSA_SET_UNUSED));
+}
+
+void arch_alloc_page(struct page *page, int order)
+{
+ int i, rc;
+
+ if (!cmma_flag)
+ return;
+ for (i = 0; i < (1 << order); i++)
+ asm volatile(".insn rrf,0xb9ab0000,%0,%1,%2,0"
+ : "=&d" (rc)
+ : "a" ((page_to_pfn(page) + i) << PAGE_SHIFT),
+ "i" (ESSA_SET_STABLE));
+}