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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-07-26 15:04:03 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2013-07-29 09:03:19 +0200 |
| commit | ee6ee55bb505c5bd8e64bc652281a93fb99c07b3 (patch) | |
| tree | d967a92ce780c0353a7ceebb03d38c299b3cba4c | |
| parent | 3eabaee998c787e7e1565574821652548f7fc003 (diff) | |
| download | linux-ee6ee55bb505c5bd8e64bc652281a93fb99c07b3.tar.bz2 | |
KVM: s390: fix task size check
The gmap_map_segment function uses PGDIR_SIZE in the check for the
maximum address in the tasks address space. This incorrectly limits
the amount of memory usable for a kvm guest to 4TB. The correct limit
is (1UL << 53). As the TASK_SIZE has different values (4TB vs 8PB)
dependent on the existance of the fourth page table level, create
a new define 'TASK_MAX_SIZE' for (1UL << 53).
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/s390/include/asm/processor.h | 2 | ||||
| -rw-r--r-- | arch/s390/mm/pgtable.c | 2 |
2 files changed, 3 insertions, 1 deletions
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h index 6b499870662f..83c85c217f5c 100644 --- a/arch/s390/include/asm/processor.h +++ b/arch/s390/include/asm/processor.h @@ -43,6 +43,7 @@ extern void execve_tail(void); #ifndef CONFIG_64BIT #define TASK_SIZE (1UL << 31) +#define TASK_MAX_SIZE (1UL << 31) #define TASK_UNMAPPED_BASE (1UL << 30) #else /* CONFIG_64BIT */ @@ -51,6 +52,7 @@ extern void execve_tail(void); #define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \ (1UL << 30) : (1UL << 41)) #define TASK_SIZE TASK_SIZE_OF(current) +#define TASK_MAX_SIZE (1UL << 53) #endif /* CONFIG_64BIT */ diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index 6d332487f363..967d0bf1c059 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -335,7 +335,7 @@ int gmap_map_segment(struct gmap *gmap, unsigned long from, if ((from | to | len) & (PMD_SIZE - 1)) return -EINVAL; - if (len == 0 || from + len > PGDIR_SIZE || + if (len == 0 || from + len > TASK_MAX_SIZE || from + len < from || to + len < to) return -EINVAL; |