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>
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@ -43,6 +43,7 @@ extern void execve_tail(void);
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#ifndef CONFIG_64BIT
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#define TASK_SIZE (1UL << 31)
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#define TASK_MAX_SIZE (1UL << 31)
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#define TASK_UNMAPPED_BASE (1UL << 30)
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#else /* CONFIG_64BIT */
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@ -51,6 +52,7 @@ extern void execve_tail(void);
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#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_31BIT) ? \
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(1UL << 30) : (1UL << 41))
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#define TASK_SIZE TASK_SIZE_OF(current)
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#define TASK_MAX_SIZE (1UL << 53)
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#endif /* CONFIG_64BIT */
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@ -335,7 +335,7 @@ int gmap_map_segment(struct gmap *gmap, unsigned long from,
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if ((from | to | len) & (PMD_SIZE - 1))
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return -EINVAL;
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if (len == 0 || from + len > PGDIR_SIZE ||
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if (len == 0 || from + len > TASK_MAX_SIZE ||
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from + len < from || to + len < to)
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return -EINVAL;
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