KVM: PPC: Book3S: Introduce hypervisor call H_GET_TCE
This introduces the H_GET_TCE hypervisor call, which is basically the reverse of H_PUT_TCE, as defined in the Power Architecture Platform Requirements (PAPR). The hcall H_GET_TCE is required by the kdump kernel, which uses it to retrieve TCEs set up by the previous (panicked) kernel. Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com> Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Paul Mackerras <paulus@samba.org>
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@ -129,6 +129,8 @@ extern long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
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struct kvm_create_spapr_tce *args);
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extern long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
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unsigned long ioba, unsigned long tce);
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extern long kvmppc_h_get_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
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unsigned long ioba);
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extern struct kvm_rma_info *kvm_alloc_rma(void);
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extern void kvm_release_rma(struct kvm_rma_info *ri);
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extern struct page *kvm_alloc_hpt(unsigned long nr_pages);
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@ -75,3 +75,31 @@ long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
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return H_TOO_HARD;
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}
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EXPORT_SYMBOL_GPL(kvmppc_h_put_tce);
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long kvmppc_h_get_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
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unsigned long ioba)
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{
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struct kvm *kvm = vcpu->kvm;
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struct kvmppc_spapr_tce_table *stt;
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list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) {
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if (stt->liobn == liobn) {
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unsigned long idx = ioba >> SPAPR_TCE_SHIFT;
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struct page *page;
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u64 *tbl;
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if (ioba >= stt->window_size)
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return H_PARAMETER;
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page = stt->pages[idx / TCES_PER_PAGE];
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tbl = (u64 *)page_address(page);
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vcpu->arch.gpr[4] = tbl[idx % TCES_PER_PAGE];
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return H_SUCCESS;
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}
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}
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/* Didn't find the liobn, punt it to userspace */
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return H_TOO_HARD;
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}
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EXPORT_SYMBOL_GPL(kvmppc_h_get_tce);
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@ -1691,7 +1691,7 @@ hcall_real_table:
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.long 0 /* 0x10 - H_CLEAR_MOD */
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.long 0 /* 0x14 - H_CLEAR_REF */
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.long .kvmppc_h_protect - hcall_real_table
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.long 0 /* 0x1c - H_GET_TCE */
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.long .kvmppc_h_get_tce - hcall_real_table
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.long .kvmppc_h_put_tce - hcall_real_table
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.long 0 /* 0x24 - H_SET_SPRG0 */
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.long .kvmppc_h_set_dabr - hcall_real_table
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