diff options
| author | Laurent Dufour <ldufour@linux.vnet.ibm.com> | 2014-02-21 19:31:10 +0400 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2014-03-26 16:34:27 +0400 |
| commit | 69e9fbb278af8de3059f1d1017b52a32b5f9f0bd (patch) | |
| tree | 7b96728fb8533860aca4cf607417a5f1ab332ad4 /arch/powerpc/kvm/book3s_64_vio_hv.c | |
| parent | e59d24e61269de34d79d2f39d3d581c219ac7a94 (diff) | |
| download | linux-69e9fbb278af8de3059f1d1017b52a32b5f9f0bd.tar.xz | |
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>
Diffstat (limited to 'arch/powerpc/kvm/book3s_64_vio_hv.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_vio_hv.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_64_vio_hv.c b/arch/powerpc/kvm/book3s_64_vio_hv.c index 2c25f5412bdb..89e96b3e0039 100644 --- a/arch/powerpc/kvm/book3s_64_vio_hv.c +++ b/arch/powerpc/kvm/book3s_64_vio_hv.c @@ -75,3 +75,31 @@ long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn, return H_TOO_HARD; } EXPORT_SYMBOL_GPL(kvmppc_h_put_tce); + +long kvmppc_h_get_tce(struct kvm_vcpu *vcpu, unsigned long liobn, + unsigned long ioba) +{ + struct kvm *kvm = vcpu->kvm; + struct kvmppc_spapr_tce_table *stt; + + list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) { + if (stt->liobn == liobn) { + unsigned long idx = ioba >> SPAPR_TCE_SHIFT; + struct page *page; + u64 *tbl; + + if (ioba >= stt->window_size) + return H_PARAMETER; + + page = stt->pages[idx / TCES_PER_PAGE]; + tbl = (u64 *)page_address(page); + + vcpu->arch.gpr[4] = tbl[idx % TCES_PER_PAGE]; + return H_SUCCESS; + } + } + + /* Didn't find the liobn, punt it to userspace */ + return H_TOO_HARD; +} +EXPORT_SYMBOL_GPL(kvmppc_h_get_tce); |