vmx_onhyperv.h

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#ifndef __ARCH_X86_KVM_VMX_ONHYPERV_H__
#define __ARCH_X86_KVM_VMX_ONHYPERV_H__
 
#include <asm/hyperv-tlfs.h>
#include <asm/mshyperv.h>
 
#include <linux/jump_label.h>
 
#include "capabilities.h"
#include "hyperv_evmcs.h"
#include "vmcs12.h"
 
#define current_evmcs ((struct hv_enlightened_vmcs *)this_cpu_read(current_vmcs))
 
#if IS_ENABLED(CONFIG_HYPERV)
 
DECLARE_STATIC_KEY_FALSE(__kvm_is_using_evmcs);
 
static __always_inline bool kvm_is_using_evmcs(void)
{
    return static_branch_unlikely(&__kvm_is_using_evmcs);
}
 
static __always_inline int get_evmcs_offset(unsigned long field,
                        u16 *clean_field)
{
    int offset = evmcs_field_offset(field, clean_field);
 
    WARN_ONCE(offset < 0, "accessing unsupported EVMCS field %lx\n", field);
    return offset;
}
 
static __always_inline void evmcs_write64(unsigned long field, u64 value)
{
    u16 clean_field;
    int offset = get_evmcs_offset(field, &clean_field);
 
    if (offset < 0)
        return;
 
    *(u64 *)((char *)current_evmcs + offset) = value;
 
    current_evmcs->hv_clean_fields &= ~clean_field;
}
 
static __always_inline void evmcs_write32(unsigned long field, u32 value)
{
    u16 clean_field;
    int offset = get_evmcs_offset(field, &clean_field);
 
    if (offset < 0)
        return;
 
    *(u32 *)((char *)current_evmcs + offset) = value;
    current_evmcs->hv_clean_fields &= ~clean_field;
}
 
static __always_inline void evmcs_write16(unsigned long field, u16 value)
{
    u16 clean_field;
    int offset = get_evmcs_offset(field, &clean_field);
 
    if (offset < 0)
        return;
 
    *(u16 *)((char *)current_evmcs + offset) = value;
    current_evmcs->hv_clean_fields &= ~clean_field;
}
 
static __always_inline u64 evmcs_read64(unsigned long field)
{
    int offset = get_evmcs_offset(field, NULL);
 
    if (offset < 0)
        return 0;
 
    return *(u64 *)((char *)current_evmcs + offset);
}
 
static __always_inline u32 evmcs_read32(unsigned long field)
{
    int offset = get_evmcs_offset(field, NULL);
 
    if (offset < 0)
        return 0;
 
    return *(u32 *)((char *)current_evmcs + offset);
}
 
static __always_inline u16 evmcs_read16(unsigned long field)
{
    int offset = get_evmcs_offset(field, NULL);
 
    if (offset < 0)
        return 0;
 
    return *(u16 *)((char *)current_evmcs + offset);
}
 
static inline void evmcs_load(u64 phys_addr)
{
    struct hv_vp_assist_page *vp_ap =
        hv_get_vp_assist_page(smp_processor_id());
 
    if (current_evmcs->hv_enlightenments_control.nested_flush_hypercall)
        vp_ap->nested_control.features.directhypercall = 1;
    vp_ap->current_nested_vmcs = phys_addr;
    vp_ap->enlighten_vmentry = 1;
}
 
void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf);
#else /* !IS_ENABLED(CONFIG_HYPERV) */
static __always_inline bool kvm_is_using_evmcs(void) { return false; }
static __always_inline void evmcs_write64(unsigned long field, u64 value) {}
static __always_inline void evmcs_write32(unsigned long field, u32 value) {}
static __always_inline void evmcs_write16(unsigned long field, u16 value) {}
static __always_inline u64 evmcs_read64(unsigned long field) { return 0; }
static __always_inline u32 evmcs_read32(unsigned long field) { return 0; }
static __always_inline u16 evmcs_read16(unsigned long field) { return 0; }
static inline void evmcs_load(u64 phys_addr) {}
#endif /* IS_ENABLED(CONFIG_HYPERV) */
 
#endif /* __ARCH_X86_KVM_VMX_ONHYPERV_H__ */