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KVM: s390: add capability indicating COW support

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Currently qemu/kvm on s390 uses a guest mapping that does not
allow the guest backing page table to be write-protected to
support older systems. On those older systems a host write
protection fault will be delivered to the guest.

Newer systems allow to write-protect the guest backing memory
and let the fault be delivered to the host, thus allowing COW.

Use a capability bit to tell qemu if that is possible.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Christian Borntraeger 2012-05-15 14:15:25 +02:00 • committed by Marcelo Tosatti
parent d8368af8b4
commit 1526bf9ccf
4 changed files with 17 additions and 1 deletions
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include/linux/kvm.h
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@ -616,6 +616,7 @@ struct kvm_ppc_smmu_info {
#define KVM_CAP_KVMCLOCK_CTRL 76
#define KVM_CAP_SIGNAL_MSI 77
#define KVM_CAP_PPC_GET_SMMU_INFO 78
#define KVM_CAP_S390_COW 79
#ifdef KVM_CAP_IRQ_ROUTING