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KVM: s390: Remove the sanity checks for kvm memory slot

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To model the standby memory with memory_region_add_subregion
and friends, the guest would have one or more regions of ram.
Remove the check allowing only one memory slot and the check
requiring the real address of memory slot starts at zero.

Signed-off-by: Nick Wang <jfwang@us.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Nick Wang 2013-03-25 17:22:57 +01:00 committed by Gleb Natapov
parent 3188bf6b80
commit dd2887e7c3
1 changed files with 4 additions and 12 deletions
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16
arch/s390/kvm/kvm-s390.c
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@ -977,18 +977,10 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem, struct kvm_userspace_memory_region *mem,
enum kvm_mr_change change) enum kvm_mr_change change)
{ {
/* A few sanity checks. We can have exactly one memory slot which has /* A few sanity checks. We can have memory slots which have to be
to start at guest virtual zero and which has to be located at a located/ended at a segment boundary (1MB). The memory in userland is
page boundary in userland and which has to end at a page boundary. ok to be fragmented into various different vmas. It is okay to mmap()
The memory in userland is ok to be fragmented into various different and munmap() stuff in this slot after doing this call at any time */
vmas. It is okay to mmap() and munmap() stuff in this slot after
doing this call at any time */
if (mem->slot)
return -EINVAL;
if (mem->guest_phys_addr)
return -EINVAL;
if (mem->userspace_addr & 0xffffful) if (mem->userspace_addr & 0xffffful)
return -EINVAL; return -EINVAL;