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authorPaul Mackerras <paulus@ozlabs.org>2016-05-05 16:17:10 +1000
committerPaul Mackerras <paulus@samba.org>2016-05-11 21:19:10 +1000
commiteb8b0560160d8363bc40ca05a75ef144cebaae72 (patch)
tree6f550cfc3b32b335984bbd7f8ed6760ff799364b /Documentation
parentade3ac660a1813344bcf4fe58b9ac5fbe7c0ed4b (diff)
KVM: PPC: Fix emulated MMIO sign-extension
When the guest does a sign-extending load instruction (such as lha or lwa) to an emulated MMIO location, it results in a call to kvmppc_handle_loads() in the host. That function sets the vcpu->arch.mmio_sign_extend flag and calls kvmppc_handle_load() to do the rest of the work. However, kvmppc_handle_load() sets the mmio_sign_extend flag to 0 unconditionally, so the sign extension never gets done. To fix this, we rename kvmppc_handle_load to __kvmppc_handle_load and add an explicit parameter to indicate whether sign extension is required. kvmppc_handle_load() and kvmppc_handle_loads() then become 1-line functions that just call __kvmppc_handle_load() with the extra parameter. Reported-by: Bin Lu <lblulb@linux.vnet.ibm.com> Signed-off-by: Paul Mackerras <paulus@ozlabs.org> Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
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