kvm/powerpc: Add new ioctl to retreive server MMU infos
This is necessary for qemu to be able to pass the right information
to the guest, such as the supported page sizes and corresponding
encodings in the SLB and hash table, which can vary depending
on the processor type, the type of KVM used (PR vs HV) and the
version of KVM
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[agraf: fix compilation on hv, adjust for newer ioctl numbers]
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 59c2967..bb5a0f4 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -1175,6 +1175,38 @@
return fd;
}
+static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps,
+ int linux_psize)
+{
+ struct mmu_psize_def *def = &mmu_psize_defs[linux_psize];
+
+ if (!def->shift)
+ return;
+ (*sps)->page_shift = def->shift;
+ (*sps)->slb_enc = def->sllp;
+ (*sps)->enc[0].page_shift = def->shift;
+ (*sps)->enc[0].pte_enc = def->penc;
+ (*sps)++;
+}
+
+int kvm_vm_ioctl_get_smmu_info(struct kvm *kvm, struct kvm_ppc_smmu_info *info)
+{
+ struct kvm_ppc_one_seg_page_size *sps;
+
+ info->flags = KVM_PPC_PAGE_SIZES_REAL;
+ if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
+ info->flags |= KVM_PPC_1T_SEGMENTS;
+ info->slb_size = mmu_slb_size;
+
+ /* We only support these sizes for now, and no muti-size segments */
+ sps = &info->sps[0];
+ kvmppc_add_seg_page_size(&sps, MMU_PAGE_4K);
+ kvmppc_add_seg_page_size(&sps, MMU_PAGE_64K);
+ kvmppc_add_seg_page_size(&sps, MMU_PAGE_16M);
+
+ return 0;
+}
+
/*
* Get (and clear) the dirty memory log for a memory slot.
*/