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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2010-02-26 22:37:38 +0100
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-02-26 22:37:31 +0100
commit27d71602b4a605fbb31088e69ac12187e69a9443 (patch)
tree2f4203a85e5191abbb6ffd21c277eb2afb23a0ab /arch/s390
parent432ac5e04b931df8376e0858d4bf0fd41436a271 (diff)
downloadlinux-27d71602b4a605fbb31088e69ac12187e69a9443.tar.bz2
[S390] add MACHINE_IS_LPAR flag
Introduce the MACHINE_IS_LPAR flag for code that should only be executed if Linux is running in an LPAR. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/include/asm/setup.h3
-rw-r--r--arch/s390/kernel/early.c9
-rw-r--r--arch/s390/kernel/setup.c4
3 files changed, 11 insertions, 5 deletions
diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h
index 52a779c337e8..76f530b65f00 100644
--- a/arch/s390/include/asm/setup.h
+++ b/arch/s390/include/asm/setup.h
@@ -71,9 +71,12 @@ extern unsigned int user_mode;
#define MACHINE_FLAG_KVM (1UL << 9)
#define MACHINE_FLAG_HPAGE (1UL << 10)
#define MACHINE_FLAG_PFMF (1UL << 11)
+#define MACHINE_FLAG_LPAR (1UL << 12)
#define MACHINE_IS_VM (S390_lowcore.machine_flags & MACHINE_FLAG_VM)
#define MACHINE_IS_KVM (S390_lowcore.machine_flags & MACHINE_FLAG_KVM)
+#define MACHINE_IS_LPAR (S390_lowcore.machine_flags & MACHINE_FLAG_LPAR)
+
#define MACHINE_HAS_DIAG9C (S390_lowcore.machine_flags & MACHINE_FLAG_DIAG9C)
#ifndef __s390x__
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index e49e9e0c69fd..02e45861b55b 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -214,10 +214,13 @@ static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);
static noinline __init void detect_machine_type(void)
{
- /* No VM information? Looks like LPAR */
- if (stsi(&vmms, 3, 2, 2) == -ENOSYS)
+ /* Check current-configuration-level */
+ if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) {
+ S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
return;
- if (!vmms.count)
+ }
+ /* Get virtual-machine cpu information. */
+ if (stsi(&vmms, 3, 2, 2) == -ENOSYS || !vmms.count)
return;
/* Running under KVM? If not we assume z/VM */
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 8d8957b38ab3..d9fb98cde0fa 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -804,7 +804,7 @@ setup_arch(char **cmdline_p)
if (MACHINE_IS_VM)
pr_info("Linux is running as a z/VM "
"guest operating system in 31-bit mode\n");
- else
+ else if (MACHINE_IS_LPAR)
pr_info("Linux is running natively in 31-bit mode\n");
if (MACHINE_HAS_IEEE)
pr_info("The hardware system has IEEE compatible "
@@ -818,7 +818,7 @@ setup_arch(char **cmdline_p)
"guest operating system in 64-bit mode\n");
else if (MACHINE_IS_KVM)
pr_info("Linux is running under KVM in 64-bit mode\n");
- else
+ else if (MACHINE_IS_LPAR)
pr_info("Linux is running natively in 64-bit mode\n");
#endif /* CONFIG_64BIT */