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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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69e9fbb278
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>
106 lines
3.0 KiB
C
106 lines
3.0 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
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* Copyright 2011 David Gibson, IBM Corporation <dwg@au1.ibm.com>
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*/
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/kvm.h>
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#include <linux/kvm_host.h>
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#include <linux/highmem.h>
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#include <linux/gfp.h>
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#include <linux/slab.h>
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#include <linux/hugetlb.h>
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#include <linux/list.h>
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#include <asm/tlbflush.h>
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#include <asm/kvm_ppc.h>
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#include <asm/kvm_book3s.h>
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#include <asm/mmu-hash64.h>
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#include <asm/hvcall.h>
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#include <asm/synch.h>
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#include <asm/ppc-opcode.h>
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#include <asm/kvm_host.h>
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#include <asm/udbg.h>
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#define TCES_PER_PAGE (PAGE_SIZE / sizeof(u64))
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/* WARNING: This will be called in real-mode on HV KVM and virtual
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* mode on PR KVM
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*/
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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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{
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struct kvm *kvm = vcpu->kvm;
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struct kvmppc_spapr_tce_table *stt;
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/* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */
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/* liobn, ioba, tce); */
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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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/* udbg_printf("H_PUT_TCE: liobn 0x%lx => stt=%p window_size=0x%x\n", */
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/* liobn, stt, stt->window_size); */
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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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/* FIXME: Need to validate the TCE itself */
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/* udbg_printf("tce @ %p\n", &tbl[idx % TCES_PER_PAGE]); */
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tbl[idx % TCES_PER_PAGE] = tce;
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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_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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