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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c5fbdffbda
Store shadow TLB entries in memory, but only use it on host context switch (instead of every guest entry). This improves performance for most workloads on 440 by reducing the guest TLB miss rate. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
62 lines
1.8 KiB
C
62 lines
1.8 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 IBM Corp. 2008
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*
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* Authors: Hollis Blanchard <hollisb@us.ibm.com>
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*/
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#ifndef __ASM_44X_H__
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#define __ASM_44X_H__
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#include <linux/kvm_host.h>
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#define PPC44x_TLB_SIZE 64
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/* If the guest is expecting it, this can be as large as we like; we'd just
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* need to find some way of advertising it. */
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#define KVM44x_GUEST_TLB_SIZE 64
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struct kvmppc_44x_shadow_ref {
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struct page *page;
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u16 gtlb_index;
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u8 writeable;
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u8 tid;
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};
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struct kvmppc_vcpu_44x {
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/* Unmodified copy of the guest's TLB. */
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struct kvmppc_44x_tlbe guest_tlb[KVM44x_GUEST_TLB_SIZE];
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/* References to guest pages in the hardware TLB. */
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struct kvmppc_44x_shadow_ref shadow_refs[PPC44x_TLB_SIZE];
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/* State of the shadow TLB at guest context switch time. */
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struct kvmppc_44x_tlbe shadow_tlb[PPC44x_TLB_SIZE];
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u8 shadow_tlb_mod[PPC44x_TLB_SIZE];
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struct kvm_vcpu vcpu;
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};
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static inline struct kvmppc_vcpu_44x *to_44x(struct kvm_vcpu *vcpu)
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{
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return container_of(vcpu, struct kvmppc_vcpu_44x, vcpu);
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}
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void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 new_pid);
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void kvmppc_44x_tlb_put(struct kvm_vcpu *vcpu);
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void kvmppc_44x_tlb_load(struct kvm_vcpu *vcpu);
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#endif /* __ASM_44X_H__ */
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