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kvm/powerpc: Add new ioctl to retreive server MMU infos

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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>
This commit is contained in:
Benjamin Herrenschmidt
2012-04-26 19:43:42 +00:00
committed by Alexander Graf
parent f31e65e117
commit 5b74716eba
7 changed files with 177 additions and 1 deletions
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32
arch/powerpc/kvm/book3s_hv.c
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@@ -1175,6 +1175,38 @@ long kvm_vm_ioctl_allocate_rma(struct kvm *kvm, struct kvm_allocate_rma *ret)
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.
*/