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This is how Xen guests do steal time accounting. The hypervisor records the amount of time spent in each of running/runnable/blocked/offline states. In the Xen accounting, a vCPU is still in state RUNSTATE_running while in Xen for a hypercall or I/O trap, etc. Only if Xen explicitly schedules does the state become RUNSTATE_blocked. In KVM this means that even when the vCPU exits the kvm_run loop, the state remains RUNSTATE_running. The VMM can explicitly set the vCPU to RUNSTATE_blocked by using the KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_CURRENT attribute, and can also use KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST to retrospectively add a given amount of time to the blocked state and subtract it from the running state. The state_entry_time corresponds to get_kvmclock_ns() at the time the vCPU entered the current state, and the total times of all four states should always add up to state_entry_time. Co-developed-by: Joao Martins <joao.m.martins@oracle.com> Signed-off-by: Joao Martins <joao.m.martins@oracle.com> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Message-Id: <20210301125309.874953-2-dwmw2@infradead.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
139 lines
3.6 KiB
C
139 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright © 2019 Oracle and/or its affiliates. All rights reserved.
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* Copyright © 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* KVM Xen emulation
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*/
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#ifndef __ARCH_X86_KVM_XEN_H__
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#define __ARCH_X86_KVM_XEN_H__
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#ifdef CONFIG_KVM_XEN
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#include <linux/jump_label_ratelimit.h>
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extern struct static_key_false_deferred kvm_xen_enabled;
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int __kvm_xen_has_interrupt(struct kvm_vcpu *vcpu);
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int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data);
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int kvm_xen_vcpu_get_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data);
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int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data);
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int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data);
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int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data);
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int kvm_xen_hvm_config(struct kvm *kvm, struct kvm_xen_hvm_config *xhc);
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void kvm_xen_destroy_vm(struct kvm *kvm);
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static inline bool kvm_xen_msr_enabled(struct kvm *kvm)
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{
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return static_branch_unlikely(&kvm_xen_enabled.key) &&
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kvm->arch.xen_hvm_config.msr;
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}
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static inline bool kvm_xen_hypercall_enabled(struct kvm *kvm)
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{
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return static_branch_unlikely(&kvm_xen_enabled.key) &&
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(kvm->arch.xen_hvm_config.flags &
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KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL);
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}
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static inline int kvm_xen_has_interrupt(struct kvm_vcpu *vcpu)
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{
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if (static_branch_unlikely(&kvm_xen_enabled.key) &&
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vcpu->arch.xen.vcpu_info_set && vcpu->kvm->arch.xen.upcall_vector)
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return __kvm_xen_has_interrupt(vcpu);
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return 0;
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}
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#else
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static inline int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data)
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{
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return 1;
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}
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static inline void kvm_xen_destroy_vm(struct kvm *kvm)
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{
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}
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static inline bool kvm_xen_msr_enabled(struct kvm *kvm)
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{
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return false;
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}
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static inline bool kvm_xen_hypercall_enabled(struct kvm *kvm)
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{
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return false;
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}
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static inline int kvm_xen_has_interrupt(struct kvm_vcpu *vcpu)
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{
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return 0;
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}
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#endif
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int kvm_xen_hypercall(struct kvm_vcpu *vcpu);
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#include <asm/pvclock-abi.h>
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#include <asm/xen/interface.h>
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#include <xen/interface/vcpu.h>
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void kvm_xen_update_runstate_guest(struct kvm_vcpu *vcpu, int state);
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static inline void kvm_xen_runstate_set_running(struct kvm_vcpu *vcpu)
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{
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kvm_xen_update_runstate_guest(vcpu, RUNSTATE_running);
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}
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static inline void kvm_xen_runstate_set_preempted(struct kvm_vcpu *vcpu)
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{
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/*
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* If the vCPU wasn't preempted but took a normal exit for
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* some reason (hypercalls, I/O, etc.), that is accounted as
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* still RUNSTATE_running, as the VMM is still operating on
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* behalf of the vCPU. Only if the VMM does actually block
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* does it need to enter RUNSTATE_blocked.
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*/
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if (vcpu->preempted)
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kvm_xen_update_runstate_guest(vcpu, RUNSTATE_runnable);
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}
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/* 32-bit compatibility definitions, also used natively in 32-bit build */
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struct compat_arch_vcpu_info {
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unsigned int cr2;
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unsigned int pad[5];
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};
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struct compat_vcpu_info {
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uint8_t evtchn_upcall_pending;
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uint8_t evtchn_upcall_mask;
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uint16_t pad;
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uint32_t evtchn_pending_sel;
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struct compat_arch_vcpu_info arch;
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struct pvclock_vcpu_time_info time;
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}; /* 64 bytes (x86) */
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struct compat_arch_shared_info {
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unsigned int max_pfn;
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unsigned int pfn_to_mfn_frame_list_list;
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unsigned int nmi_reason;
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unsigned int p2m_cr3;
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unsigned int p2m_vaddr;
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unsigned int p2m_generation;
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uint32_t wc_sec_hi;
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};
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struct compat_shared_info {
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struct compat_vcpu_info vcpu_info[MAX_VIRT_CPUS];
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uint32_t evtchn_pending[32];
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uint32_t evtchn_mask[32];
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struct pvclock_wall_clock wc;
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struct compat_arch_shared_info arch;
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};
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struct compat_vcpu_runstate_info {
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int state;
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uint64_t state_entry_time;
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uint64_t time[4];
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} __attribute__((packed));
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#endif /* __ARCH_X86_KVM_XEN_H__ */
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