On Thu, Jul 23, 2020 at 01:07:21PM -0700, Ram Pai wrote: > The Ultravisor is expected to explicitly call H_SVM_PAGE_IN for all the > pages of the SVM before calling H_SVM_INIT_DONE. This causes a huge > delay in tranistioning the VM to SVM. The Ultravisor is only interested > in the pages that contain the kernel, initrd and other important data > structures. The rest contain throw-away content. > > However if not all pages are requested by the Ultravisor, the Hypervisor > continues to consider the GFNs corresponding to the non-requested pages > as normal GFNs. This can lead to data-corruption and undefined behavior. > > In H_SVM_INIT_DONE handler, move all the PFNs associated with the SVM's > GFNs to secure-PFNs. Skip the GFNs that are already Paged-in or Shared > or Paged-in followed by a Paged-out. > > Cc: Paul Mackerras <pau...@ozlabs.org> > Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org> > Cc: Michael Ellerman <m...@ellerman.id.au> > Cc: Bharata B Rao <bhar...@linux.ibm.com> > Cc: Aneesh Kumar K.V <aneesh.ku...@linux.ibm.com> > Cc: Sukadev Bhattiprolu <suka...@linux.vnet.ibm.com> > Cc: Laurent Dufour <lduf...@linux.ibm.com> > Cc: Thiago Jung Bauermann <bauer...@linux.ibm.com> > Cc: David Gibson <da...@gibson.dropbear.id.au> > Cc: Claudio Carvalho <cclau...@linux.ibm.com> > Cc: kvm-...@vger.kernel.org > Cc: linuxppc-dev@lists.ozlabs.org > Signed-off-by: Ram Pai <linux...@us.ibm.com> > --- > Documentation/powerpc/ultravisor.rst | 2 + > arch/powerpc/include/asm/kvm_book3s_uvmem.h | 2 + > arch/powerpc/kvm/book3s_hv_uvmem.c | 136 > +++++++++++++++++++++++++--- > 3 files changed, 127 insertions(+), 13 deletions(-) > > diff --git a/Documentation/powerpc/ultravisor.rst > b/Documentation/powerpc/ultravisor.rst > index a1c8c37..ba6b1bf 100644 > --- a/Documentation/powerpc/ultravisor.rst > +++ b/Documentation/powerpc/ultravisor.rst > @@ -934,6 +934,8 @@ Return values > * H_UNSUPPORTED if called from the wrong context (e.g. > from an SVM or before an H_SVM_INIT_START > hypercall). > + * H_STATE if the hypervisor could not successfully > + transition the VM to Secure VM. > > Description > ~~~~~~~~~~~ > diff --git a/arch/powerpc/include/asm/kvm_book3s_uvmem.h > b/arch/powerpc/include/asm/kvm_book3s_uvmem.h > index 9cb7d8b..f229ab5 100644 > --- a/arch/powerpc/include/asm/kvm_book3s_uvmem.h > +++ b/arch/powerpc/include/asm/kvm_book3s_uvmem.h > @@ -23,6 +23,8 @@ unsigned long kvmppc_h_svm_page_out(struct kvm *kvm, > unsigned long kvmppc_h_svm_init_abort(struct kvm *kvm); > void kvmppc_uvmem_drop_pages(const struct kvm_memory_slot *free, > struct kvm *kvm, bool skip_page_out); > +int kvmppc_uv_migrate_mem_slot(struct kvm *kvm, > + const struct kvm_memory_slot *memslot);
I still don't see why this be a global function. You should be able to move around a few functions in book3s_hv_uvmem.c up/down and satisfy the calling order dependencies. Otherwise, Reviewed-by: Bharata B Rao <bhar...@linux.ibm.com>
