[mirror_ubuntu-jammy-kernel.git] / arch / x86 / kvm / xen.h

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright © 2019 Oracle and/or its affiliates. All rights reserved.
 * Copyright © 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * KVM Xen emulation
 */

#ifndef __ARCH_X86_KVM_XEN_H__
#define __ARCH_X86_KVM_XEN_H__

#ifdef CONFIG_KVM_XEN
#include <linux/jump_label_ratelimit.h>

extern struct static_key_false_deferred kvm_xen_enabled;

int __kvm_xen_has_interrupt(struct kvm_vcpu *vcpu);
int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data);
int kvm_xen_vcpu_get_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data);
int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data);
int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data);
int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data);
int kvm_xen_hvm_config(struct kvm *kvm, struct kvm_xen_hvm_config *xhc);
void kvm_xen_init_vm(struct kvm *kvm);
void kvm_xen_destroy_vm(struct kvm *kvm);

static inline bool kvm_xen_msr_enabled(struct kvm *kvm)
{
	return static_branch_unlikely(&kvm_xen_enabled.key) &&
		kvm->arch.xen_hvm_config.msr;
}

static inline bool kvm_xen_hypercall_enabled(struct kvm *kvm)
{
	return static_branch_unlikely(&kvm_xen_enabled.key) &&
		(kvm->arch.xen_hvm_config.flags &
		 KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL);
}

static inline int kvm_xen_has_interrupt(struct kvm_vcpu *vcpu)
{
	if (static_branch_unlikely(&kvm_xen_enabled.key) &&
	    vcpu->arch.xen.vcpu_info_set && vcpu->kvm->arch.xen.upcall_vector)
		return __kvm_xen_has_interrupt(vcpu);

	return 0;
}
#else
static inline int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data)
{
	return 1;
}

static inline void kvm_xen_init_vm(struct kvm *kvm)
{
}

static inline void kvm_xen_destroy_vm(struct kvm *kvm)
{
}

static inline bool kvm_xen_msr_enabled(struct kvm *kvm)
{
	return false;
}

static inline bool kvm_xen_hypercall_enabled(struct kvm *kvm)
{
	return false;
}

static inline int kvm_xen_has_interrupt(struct kvm_vcpu *vcpu)
{
	return 0;
}
#endif

int kvm_xen_hypercall(struct kvm_vcpu *vcpu);

#include <asm/pvclock-abi.h>
#include <asm/xen/interface.h>
#include <xen/interface/vcpu.h>

void kvm_xen_update_runstate_guest(struct kvm_vcpu *vcpu, int state);

static inline void kvm_xen_runstate_set_running(struct kvm_vcpu *vcpu)
{
	kvm_xen_update_runstate_guest(vcpu, RUNSTATE_running);
}

static inline void kvm_xen_runstate_set_preempted(struct kvm_vcpu *vcpu)
{
	/*
	 * If the vCPU wasn't preempted but took a normal exit for
	 * some reason (hypercalls, I/O, etc.), that is accounted as
	 * still RUNSTATE_running, as the VMM is still operating on
	 * behalf of the vCPU. Only if the VMM does actually block
	 * does it need to enter RUNSTATE_blocked.
	 */
	if (WARN_ON_ONCE(!vcpu->preempted))
		return;

	kvm_xen_update_runstate_guest(vcpu, RUNSTATE_runnable);
}

/* 32-bit compatibility definitions, also used natively in 32-bit build */
struct compat_arch_vcpu_info {
	unsigned int cr2;
	unsigned int pad[5];
};

struct compat_vcpu_info {
	uint8_t evtchn_upcall_pending;
	uint8_t evtchn_upcall_mask;
	uint16_t pad;
	uint32_t evtchn_pending_sel;
	struct compat_arch_vcpu_info arch;
	struct pvclock_vcpu_time_info time;
}; /* 64 bytes (x86) */

struct compat_arch_shared_info {
	unsigned int max_pfn;
	unsigned int pfn_to_mfn_frame_list_list;
	unsigned int nmi_reason;
	unsigned int p2m_cr3;
	unsigned int p2m_vaddr;
	unsigned int p2m_generation;
	uint32_t wc_sec_hi;
};

struct compat_shared_info {
	struct compat_vcpu_info vcpu_info[MAX_VIRT_CPUS];
	uint32_t evtchn_pending[32];
	uint32_t evtchn_mask[32];
	struct pvclock_wall_clock wc;
	struct compat_arch_shared_info arch;
};

struct compat_vcpu_runstate_info {
    int state;
    uint64_t state_entry_time;
    uint64_t time[4];
} __attribute__((packed));

#endif /* __ARCH_X86_KVM_XEN_H__ */
Commit	Line	Data
23200b7a JM	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Copyright © 2019 Oracle and/or its affiliates. All rights reserved.
	4	* Copyright © 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
	5	*
	6	* KVM Xen emulation
	7	*/
	8
	9	#ifndef __ARCH_X86_KVM_XEN_H__
	10	#define __ARCH_X86_KVM_XEN_H__
	11
b59b153d	12	#ifdef CONFIG_KVM_XEN
7d6bbebb DW	13	#include <linux/jump_label_ratelimit.h>
	14
	15	extern struct static_key_false_deferred kvm_xen_enabled;
	16
40da8ccd	17	int __kvm_xen_has_interrupt(struct kvm_vcpu *vcpu);
3e324615 DW	18	int kvm_xen_vcpu_set_attr(struct kvm_vcpu vcpu, struct kvm_xen_vcpu_attr data);
3e324615 DW	19	int kvm_xen_vcpu_get_attr(struct kvm_vcpu vcpu, struct kvm_xen_vcpu_attr data);
a76b9641 JM	20	int kvm_xen_hvm_set_attr(struct kvm kvm, struct kvm_xen_hvm_attr data);
a76b9641 JM	21	int kvm_xen_hvm_get_attr(struct kvm kvm, struct kvm_xen_hvm_attr data);
23200b7a	22	int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data);
78e9878c	23	int kvm_xen_hvm_config(struct kvm kvm, struct kvm_xen_hvm_config xhc);
319afe68	24	void kvm_xen_init_vm(struct kvm *kvm);
7d6bbebb	25	void kvm_xen_destroy_vm(struct kvm *kvm);
23200b7a	26
30b5c851 DW	27	static inline bool kvm_xen_msr_enabled(struct kvm *kvm)
	28	{
	29	return static_branch_unlikely(&kvm_xen_enabled.key) &&
	30	kvm->arch.xen_hvm_config.msr;
	31	}
	32
23200b7a JM	33	static inline bool kvm_xen_hypercall_enabled(struct kvm *kvm)
23200b7a JM	34	{
7d6bbebb DW	35	return static_branch_unlikely(&kvm_xen_enabled.key) &&
	36	(kvm->arch.xen_hvm_config.flags &
	37	KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL);
23200b7a JM	38	}
23200b7a JM	39
40da8ccd DW	40	static inline int kvm_xen_has_interrupt(struct kvm_vcpu *vcpu)
	41	{
	42	if (static_branch_unlikely(&kvm_xen_enabled.key) &&
	43	vcpu->arch.xen.vcpu_info_set && vcpu->kvm->arch.xen.upcall_vector)
	44	return __kvm_xen_has_interrupt(vcpu);
	45
	46	return 0;
	47	}
b59b153d PB	48	#else
	49	static inline int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data)
	50	{
	51	return 1;
	52	}
	53
319afe68 PB	54	static inline void kvm_xen_init_vm(struct kvm *kvm)
	55	{
	56	}
	57
b59b153d PB	58	static inline void kvm_xen_destroy_vm(struct kvm *kvm)
	59	{
	60	}
	61
30b5c851 DW	62	static inline bool kvm_xen_msr_enabled(struct kvm *kvm)
	63	{
	64	return false;
	65	}
	66
b59b153d PB	67	static inline bool kvm_xen_hypercall_enabled(struct kvm *kvm)
	68	{
	69	return false;
	70	}
	71
	72	static inline int kvm_xen_has_interrupt(struct kvm_vcpu *vcpu)
	73	{
	74	return 0;
	75	}
	76	#endif
	77
	78	int kvm_xen_hypercall(struct kvm_vcpu *vcpu);
1ea9f2ed	79
1ea9f2ed DW	80	#include <asm/pvclock-abi.h>
1ea9f2ed DW	81	#include <asm/xen/interface.h>
30b5c851	82	#include <xen/interface/vcpu.h>
1ea9f2ed	83
30b5c851 DW	84	void kvm_xen_update_runstate_guest(struct kvm_vcpu *vcpu, int state);
	85
	86	static inline void kvm_xen_runstate_set_running(struct kvm_vcpu *vcpu)
	87	{
	88	kvm_xen_update_runstate_guest(vcpu, RUNSTATE_running);
	89	}
	90
	91	static inline void kvm_xen_runstate_set_preempted(struct kvm_vcpu *vcpu)
	92	{
	93	/*
	94	* If the vCPU wasn't preempted but took a normal exit for
	95	* some reason (hypercalls, I/O, etc.), that is accounted as
	96	* still RUNSTATE_running, as the VMM is still operating on
	97	* behalf of the vCPU. Only if the VMM does actually block
	98	* does it need to enter RUNSTATE_blocked.
	99	*/
2f580819 PB	100	if (WARN_ON_ONCE(!vcpu->preempted))
	101	return;
	102
	103	kvm_xen_update_runstate_guest(vcpu, RUNSTATE_runnable);
30b5c851 DW	104	}
	105
	106	/* 32-bit compatibility definitions, also used natively in 32-bit build */
1ea9f2ed DW	107	struct compat_arch_vcpu_info {
	108	unsigned int cr2;
	109	unsigned int pad[5];
	110	};
	111
	112	struct compat_vcpu_info {
7137b7ae SC	113	uint8_t evtchn_upcall_pending;
	114	uint8_t evtchn_upcall_mask;
	115	uint16_t pad;
	116	uint32_t evtchn_pending_sel;
	117	struct compat_arch_vcpu_info arch;
	118	struct pvclock_vcpu_time_info time;
1ea9f2ed DW	119	}; /* 64 bytes (x86) */
	120
	121	struct compat_arch_shared_info {
	122	unsigned int max_pfn;
	123	unsigned int pfn_to_mfn_frame_list_list;
	124	unsigned int nmi_reason;
	125	unsigned int p2m_cr3;
	126	unsigned int p2m_vaddr;
	127	unsigned int p2m_generation;
	128	uint32_t wc_sec_hi;
	129	};
	130
	131	struct compat_shared_info {
	132	struct compat_vcpu_info vcpu_info[MAX_VIRT_CPUS];
	133	uint32_t evtchn_pending[32];
	134	uint32_t evtchn_mask[32];
	135	struct pvclock_wall_clock wc;
	136	struct compat_arch_shared_info arch;
	137	};
	138
30b5c851 DW	139	struct compat_vcpu_runstate_info {
	140	int state;
	141	uint64_t state_entry_time;
	142	uint64_t time[4];
	143	} __attribute__((packed));
	144
23200b7a	145	#endif /* __ARCH_X86_KVM_XEN_H__ */