arch/powerpc/include/asm/kvm_44x.h

   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 IBM Corp. 2008
  16  *
  17  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
  18  */
  19
  20 #ifndef __ASM_44X_H__
  21 #define __ASM_44X_H__
  22
  23 #include <linux/kvm_host.h>
  24
  25 #define PPC44x_TLB_SIZE 64
  26
  27 /* If the guest is expecting it, this can be as large as we like; we'd just
  28  * need to find some way of advertising it. */
  29 #define KVM44x_GUEST_TLB_SIZE 64
  30
  31 struct kvmppc_44x_tlbe {
  32         u32 tid; /* Only the low 8 bits are used. */
  33         u32 word0;
  34         u32 word1;
  35         u32 word2;
  36 };
  37
  38 struct kvmppc_44x_shadow_ref {
  39         struct page *page;
  40         u16 gtlb_index;
  41         u8 writeable;
  42         u8 tid;
  43 };
  44
  45 struct kvmppc_vcpu_44x {
  46         /* Unmodified copy of the guest's TLB. */
  47         struct kvmppc_44x_tlbe guest_tlb[KVM44x_GUEST_TLB_SIZE];
  48
  49         /* References to guest pages in the hardware TLB. */
  50         struct kvmppc_44x_shadow_ref shadow_refs[PPC44x_TLB_SIZE];
  51
  52         /* State of the shadow TLB at guest context switch time. */
  53         struct kvmppc_44x_tlbe shadow_tlb[PPC44x_TLB_SIZE];
  54         u8 shadow_tlb_mod[PPC44x_TLB_SIZE];
  55
  56         struct kvm_vcpu vcpu;
  57 };
  58
  59 static inline struct kvmppc_vcpu_44x *to_44x(struct kvm_vcpu *vcpu)
  60 {
  61         return container_of(vcpu, struct kvmppc_vcpu_44x, vcpu);
  62 }
  63
  64 void kvmppc_44x_tlb_put(struct kvm_vcpu *vcpu);
  65 void kvmppc_44x_tlb_load(struct kvm_vcpu *vcpu);
  66
  67 #endif /* __ASM_44X_H__ */