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KVM: s390: Add MEMOP ioctls for reading/writing guest memory

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On s390, we've got to make sure to hold the IPTE lock while accessing
logical memory. So let's add an ioctl for reading and writing logical
memory to provide this feature for userspace, too.
The maximum transfer size of this call is limited to 64kB to prevent
that the guest can trigger huge copy_from/to_user transfers. QEMU
currently only requests up to one or two pages so far, so 16*4kB seems
to be a reasonable limit here.

Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Thomas Huth
2015-02-06 15:01:21 +01:00
committed by Christian Borntraeger
parent 664b497353
commit 41408c28f2
5 changed files with 165 additions and 0 deletions
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arch/s390/kvm/gaccess.h
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@@ -157,6 +157,8 @@ int read_guest_lc(struct kvm_vcpu *vcpu, unsigned long gra, void *data,
int guest_translate_address(struct kvm_vcpu *vcpu, unsigned long gva,
ar_t ar, unsigned long *gpa, int write);
int check_gva_range(struct kvm_vcpu *vcpu, unsigned long gva, ar_t ar,
unsigned long length, int is_write);
int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
unsigned long len, int write);