Revision - aca411a - KVM: s390: reset KVM_REQ_MMU_RELOAD if mapping the prefix failed - origin: https://github.com/torvalds/linux

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Revision aca411a4b17a4aebe14ecdf253373db5b7ee6058 authored by Julius Niedworok on 03 August 2016, 14:39:55 UTC, committed by Christian Borntraeger on 12 August 2016, 07:11:08 UTC

KVM: s390: reset KVM_REQ_MMU_RELOAD if mapping the prefix failed

When triggering KVM_RUN without a user memory region being mapped
(KVM_SET_USER_MEMORY_REGION) a validity intercept occurs. This could
happen, if the user memory region was not mapped initially or if it
was unmapped after the vcpu is initialized. The function
kvm_s390_handle_requests checks for the KVM_REQ_MMU_RELOAD bit. The
check function always clears this bit. If gmap_mprotect_notify
returns an error code, the mapping failed, but the KVM_REQ_MMU_RELOAD
was not set anymore. So the next time kvm_s390_handle_requests is
called, the execution would fall trough the check for
KVM_REQ_MMU_RELOAD. The bit needs to be resetted, if
gmap_mprotect_notify returns an error code. Resetting the bit with
kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu) fixes the bug.

Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Julius Niedworok <jniedwor@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

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Tip revision: aca411a4b17a4aebe14ecdf253373db5b7ee6058 authored by Julius Niedworok on 03 August 2016, 14:39:55 UTC
KVM: s390: reset KVM_REQ_MMU_RELOAD if mapping the prefix failed

Tip revision: aca411a

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KVM: s390: reset KVM_REQ_MMU_RELOAD if mapping the prefix failed

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