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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d30f6e4800
Chips such as e500mc that implement category E.HV in Power ISA 2.06 provide hardware virtualization features, including a new MSR mode for guest state. The guest OS can perform many operations without trapping into the hypervisor, including transitions to and from guest userspace. Since we can use SRR1[GS] to reliably tell whether an exception came from guest state, instead of messing around with IVPR, we use DO_KVM similarly to book3s. Current issues include: - Machine checks from guest state are not routed to the host handler. - The guest can cause a host oops by executing an emulated instruction in a page that lacks read permission. Existing e500/4xx support has the same problem. Includes work by Ashish Kalra <Ashish.Kalra@freescale.com>, Varun Sethi <Varun.Sethi@freescale.com>, and Liu Yu <yu.liu@freescale.com>. Signed-off-by: Scott Wood <scottwood@freescale.com> [agraf: remove pt_regs usage] Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
113 lines
3.2 KiB
C
113 lines
3.2 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: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
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*/
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#ifndef __POWERPC_KVM_EXITTIMING_H__
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#define __POWERPC_KVM_EXITTIMING_H__
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#include <linux/kvm_host.h>
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#include <asm/kvm_host.h>
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#ifdef CONFIG_KVM_EXIT_TIMING
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void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu);
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void kvmppc_update_timing_stats(struct kvm_vcpu *vcpu);
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void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu, unsigned int id);
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void kvmppc_remove_vcpu_debugfs(struct kvm_vcpu *vcpu);
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static inline void kvmppc_set_exit_type(struct kvm_vcpu *vcpu, int type)
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{
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vcpu->arch.last_exit_type = type;
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}
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#else
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/* if exit timing is not configured there is no need to build the c file */
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static inline void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu) {}
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static inline void kvmppc_update_timing_stats(struct kvm_vcpu *vcpu) {}
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static inline void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu,
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unsigned int id) {}
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static inline void kvmppc_remove_vcpu_debugfs(struct kvm_vcpu *vcpu) {}
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static inline void kvmppc_set_exit_type(struct kvm_vcpu *vcpu, int type) {}
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#endif /* CONFIG_KVM_EXIT_TIMING */
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/* account the exit in kvm_stats */
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static inline void kvmppc_account_exit_stat(struct kvm_vcpu *vcpu, int type)
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{
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/* type has to be known at build time for optimization */
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/* The BUILD_BUG_ON below breaks in funny ways, commented out
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* for now ... -BenH
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BUILD_BUG_ON(!__builtin_constant_p(type));
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*/
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switch (type) {
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case EXT_INTR_EXITS:
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vcpu->stat.ext_intr_exits++;
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break;
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case DEC_EXITS:
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vcpu->stat.dec_exits++;
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break;
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case EMULATED_INST_EXITS:
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vcpu->stat.emulated_inst_exits++;
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break;
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case DCR_EXITS:
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vcpu->stat.dcr_exits++;
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break;
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case DSI_EXITS:
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vcpu->stat.dsi_exits++;
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break;
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case ISI_EXITS:
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vcpu->stat.isi_exits++;
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break;
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case SYSCALL_EXITS:
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vcpu->stat.syscall_exits++;
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break;
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case DTLB_REAL_MISS_EXITS:
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vcpu->stat.dtlb_real_miss_exits++;
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break;
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case DTLB_VIRT_MISS_EXITS:
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vcpu->stat.dtlb_virt_miss_exits++;
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break;
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case MMIO_EXITS:
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vcpu->stat.mmio_exits++;
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break;
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case ITLB_REAL_MISS_EXITS:
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vcpu->stat.itlb_real_miss_exits++;
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break;
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case ITLB_VIRT_MISS_EXITS:
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vcpu->stat.itlb_virt_miss_exits++;
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break;
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case SIGNAL_EXITS:
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vcpu->stat.signal_exits++;
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break;
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case DBELL_EXITS:
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vcpu->stat.dbell_exits++;
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break;
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case GDBELL_EXITS:
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vcpu->stat.gdbell_exits++;
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break;
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}
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}
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/* wrapper to set exit time and account for it in kvm_stats */
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static inline void kvmppc_account_exit(struct kvm_vcpu *vcpu, int type)
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{
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kvmppc_set_exit_type(vcpu, type);
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kvmppc_account_exit_stat(vcpu, type);
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}
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#endif /* __POWERPC_KVM_EXITTIMING_H__ */
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