vmx_onhyperv.h

  1/* SPDX-License-Identifier: GPL-2.0-only */
  2
  3#ifndef __ARCH_X86_KVM_VMX_ONHYPERV_H__
  4#define __ARCH_X86_KVM_VMX_ONHYPERV_H__
  5
  6#include <hyperv/hvhdk.h>
  7#include <asm/mshyperv.h>
  8
  9#include <linux/jump_label.h>
 10
 11#include "capabilities.h"
 12#include "hyperv_evmcs.h"
 13#include "vmcs12.h"
 14
 15#define current_evmcs ((struct hv_enlightened_vmcs *)this_cpu_read(current_vmcs))
 16
 17#if IS_ENABLED(CONFIG_HYPERV)
 18
 19DECLARE_STATIC_KEY_FALSE(__kvm_is_using_evmcs);
 20
 21static __always_inline bool kvm_is_using_evmcs(void)
 22{
 23	return static_branch_unlikely(&__kvm_is_using_evmcs);
 24}
 25
 26static __always_inline int get_evmcs_offset(unsigned long field,
 27					    u16 *clean_field)
 28{
 29	int offset = evmcs_field_offset(field, clean_field);
 30
 31	WARN_ONCE(offset < 0, "accessing unsupported EVMCS field %lx\n", field);
 32	return offset;
 33}
 34
 35static __always_inline void evmcs_write64(unsigned long field, u64 value)
 36{
 37	u16 clean_field;
 38	int offset = get_evmcs_offset(field, &clean_field);
 39
 40	if (offset < 0)
 41		return;
 42
 43	*(u64 *)((char *)current_evmcs + offset) = value;
 44
 45	current_evmcs->hv_clean_fields &= ~clean_field;
 46}
 47
 48static __always_inline void evmcs_write32(unsigned long field, u32 value)
 49{
 50	u16 clean_field;
 51	int offset = get_evmcs_offset(field, &clean_field);
 52
 53	if (offset < 0)
 54		return;
 55
 56	*(u32 *)((char *)current_evmcs + offset) = value;
 57	current_evmcs->hv_clean_fields &= ~clean_field;
 58}
 59
 60static __always_inline void evmcs_write16(unsigned long field, u16 value)
 61{
 62	u16 clean_field;
 63	int offset = get_evmcs_offset(field, &clean_field);
 64
 65	if (offset < 0)
 66		return;
 67
 68	*(u16 *)((char *)current_evmcs + offset) = value;
 69	current_evmcs->hv_clean_fields &= ~clean_field;
 70}
 71
 72static __always_inline u64 evmcs_read64(unsigned long field)
 73{
 74	int offset = get_evmcs_offset(field, NULL);
 75
 76	if (offset < 0)
 77		return 0;
 78
 79	return *(u64 *)((char *)current_evmcs + offset);
 80}
 81
 82static __always_inline u32 evmcs_read32(unsigned long field)
 83{
 84	int offset = get_evmcs_offset(field, NULL);
 85
 86	if (offset < 0)
 87		return 0;
 88
 89	return *(u32 *)((char *)current_evmcs + offset);
 90}
 91
 92static __always_inline u16 evmcs_read16(unsigned long field)
 93{
 94	int offset = get_evmcs_offset(field, NULL);
 95
 96	if (offset < 0)
 97		return 0;
 98
 99	return *(u16 *)((char *)current_evmcs + offset);
100}
101
102static inline void evmcs_load(u64 phys_addr)
103{
104	struct hv_vp_assist_page *vp_ap =
105		hv_get_vp_assist_page(smp_processor_id());
106
107	/*
108	 * When enabling eVMCS, KVM verifies that every CPU has a valid hv_vp_assist_page()
109	 * and aborts enabling the feature otherwise. CPU onlining path is also checked in
110	 * vmx_hardware_enable().
111	 */
112	if (KVM_BUG_ON(!vp_ap, kvm_get_running_vcpu()->kvm))
113		return;
114
115	if (current_evmcs->hv_enlightenments_control.nested_flush_hypercall)
116		vp_ap->nested_control.features.directhypercall = 1;
117	vp_ap->current_nested_vmcs = phys_addr;
118	vp_ap->enlighten_vmentry = 1;
119}
120
121void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf);
122#else /* !IS_ENABLED(CONFIG_HYPERV) */
123static __always_inline bool kvm_is_using_evmcs(void) { return false; }
124static __always_inline void evmcs_write64(unsigned long field, u64 value) {}
125static __always_inline void evmcs_write32(unsigned long field, u32 value) {}
126static __always_inline void evmcs_write16(unsigned long field, u16 value) {}
127static __always_inline u64 evmcs_read64(unsigned long field) { return 0; }
128static __always_inline u32 evmcs_read32(unsigned long field) { return 0; }
129static __always_inline u16 evmcs_read16(unsigned long field) { return 0; }
130static inline void evmcs_load(u64 phys_addr) {}
131#endif /* IS_ENABLED(CONFIG_HYPERV) */
132
133#endif /* __ARCH_X86_KVM_VMX_ONHYPERV_H__ */