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1 /*
2  * This program is free software; you can redistribute it and/or modify
3  * it under the terms of the GNU General Public License, version 2, as
4  * published by the Free Software Foundation.
5  *
6  * This program is distributed in the hope that it will be useful,
7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
9  * GNU General Public License for more details.
10  *
11  * You should have received a copy of the GNU General Public License
12  * along with this program; if not, write to the Free Software
13  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
14  *
15  * Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
16  * Copyright 2011 David Gibson, IBM Corporation <dwg@au1.ibm.com>
17  */
18 
19 #include <linux/types.h>
20 #include <linux/string.h>
21 #include <linux/kvm.h>
22 #include <linux/kvm_host.h>
23 #include <linux/highmem.h>
24 #include <linux/gfp.h>
25 #include <linux/slab.h>
26 #include <linux/hugetlb.h>
27 #include <linux/list.h>
28 
29 #include <asm/tlbflush.h>
30 #include <asm/kvm_ppc.h>
31 #include <asm/kvm_book3s.h>
32 #include <asm/mmu-hash64.h>
33 #include <asm/hvcall.h>
34 #include <asm/synch.h>
35 #include <asm/ppc-opcode.h>
36 #include <asm/kvm_host.h>
37 #include <asm/udbg.h>
38 
39 #define TCES_PER_PAGE	(PAGE_SIZE / sizeof(u64))
40 
41 /* WARNING: This will be called in real-mode on HV KVM and virtual
42  *          mode on PR KVM
43  */
kvmppc_h_put_tce(struct kvm_vcpu * vcpu,unsigned long liobn,unsigned long ioba,unsigned long tce)44 long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
45 		      unsigned long ioba, unsigned long tce)
46 {
47 	struct kvm *kvm = vcpu->kvm;
48 	struct kvmppc_spapr_tce_table *stt;
49 
50 	/* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */
51 	/* 	    liobn, ioba, tce); */
52 
53 	list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) {
54 		if (stt->liobn == liobn) {
55 			unsigned long idx = ioba >> SPAPR_TCE_SHIFT;
56 			struct page *page;
57 			u64 *tbl;
58 
59 			/* udbg_printf("H_PUT_TCE: liobn 0x%lx => stt=%p  window_size=0x%x\n", */
60 			/* 	    liobn, stt, stt->window_size); */
61 			if (ioba >= stt->window_size)
62 				return H_PARAMETER;
63 
64 			page = stt->pages[idx / TCES_PER_PAGE];
65 			tbl = (u64 *)page_address(page);
66 
67 			/* FIXME: Need to validate the TCE itself */
68 			/* udbg_printf("tce @ %p\n", &tbl[idx % TCES_PER_PAGE]); */
69 			tbl[idx % TCES_PER_PAGE] = tce;
70 			return H_SUCCESS;
71 		}
72 	}
73 
74 	/* Didn't find the liobn, punt it to userspace */
75 	return H_TOO_HARD;
76 }
77 EXPORT_SYMBOL_GPL(kvmppc_h_put_tce);
78 
kvmppc_h_get_tce(struct kvm_vcpu * vcpu,unsigned long liobn,unsigned long ioba)79 long kvmppc_h_get_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
80 		      unsigned long ioba)
81 {
82 	struct kvm *kvm = vcpu->kvm;
83 	struct kvmppc_spapr_tce_table *stt;
84 
85 	list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) {
86 		if (stt->liobn == liobn) {
87 			unsigned long idx = ioba >> SPAPR_TCE_SHIFT;
88 			struct page *page;
89 			u64 *tbl;
90 
91 			if (ioba >= stt->window_size)
92 				return H_PARAMETER;
93 
94 			page = stt->pages[idx / TCES_PER_PAGE];
95 			tbl = (u64 *)page_address(page);
96 
97 			vcpu->arch.gpr[4] = tbl[idx % TCES_PER_PAGE];
98 			return H_SUCCESS;
99 		}
100 	}
101 
102 	/* Didn't find the liobn, punt it to userspace */
103 	return H_TOO_HARD;
104 }
105 EXPORT_SYMBOL_GPL(kvmppc_h_get_tce);
106