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Some Enlightened VMCS related code is needed both by Hyper-V on KVM and
KVM on Hyper-V. As a preparation to making Hyper-V emulation optional,
create dedicated 'hyperv_evmcs.{ch}' files which are used by both.
No functional change intended.
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Tested-by: Jeremi Piotrowski <jpiotrowski@linux.microsoft.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Link: https://lore.kernel.org/r/20231205103630.1391318-7-vkuznets@redhat.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
126 lines
3.2 KiB
C
126 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef __ARCH_X86_KVM_VMX_ONHYPERV_H__
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#define __ARCH_X86_KVM_VMX_ONHYPERV_H__
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#include <asm/hyperv-tlfs.h>
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#include <asm/mshyperv.h>
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#include <linux/jump_label.h>
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#include "capabilities.h"
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#include "hyperv_evmcs.h"
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#include "vmcs12.h"
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#define current_evmcs ((struct hv_enlightened_vmcs *)this_cpu_read(current_vmcs))
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#if IS_ENABLED(CONFIG_HYPERV)
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DECLARE_STATIC_KEY_FALSE(__kvm_is_using_evmcs);
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static __always_inline bool kvm_is_using_evmcs(void)
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{
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return static_branch_unlikely(&__kvm_is_using_evmcs);
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}
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static __always_inline int get_evmcs_offset(unsigned long field,
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u16 *clean_field)
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{
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int offset = evmcs_field_offset(field, clean_field);
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WARN_ONCE(offset < 0, "accessing unsupported EVMCS field %lx\n", field);
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return offset;
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}
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static __always_inline void evmcs_write64(unsigned long field, u64 value)
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{
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u16 clean_field;
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int offset = get_evmcs_offset(field, &clean_field);
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if (offset < 0)
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return;
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*(u64 *)((char *)current_evmcs + offset) = value;
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current_evmcs->hv_clean_fields &= ~clean_field;
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}
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static __always_inline void evmcs_write32(unsigned long field, u32 value)
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{
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u16 clean_field;
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int offset = get_evmcs_offset(field, &clean_field);
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if (offset < 0)
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return;
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*(u32 *)((char *)current_evmcs + offset) = value;
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current_evmcs->hv_clean_fields &= ~clean_field;
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}
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static __always_inline void evmcs_write16(unsigned long field, u16 value)
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{
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u16 clean_field;
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int offset = get_evmcs_offset(field, &clean_field);
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if (offset < 0)
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return;
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*(u16 *)((char *)current_evmcs + offset) = value;
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current_evmcs->hv_clean_fields &= ~clean_field;
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}
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static __always_inline u64 evmcs_read64(unsigned long field)
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{
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int offset = get_evmcs_offset(field, NULL);
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if (offset < 0)
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return 0;
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return *(u64 *)((char *)current_evmcs + offset);
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}
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static __always_inline u32 evmcs_read32(unsigned long field)
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{
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int offset = get_evmcs_offset(field, NULL);
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if (offset < 0)
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return 0;
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return *(u32 *)((char *)current_evmcs + offset);
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}
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static __always_inline u16 evmcs_read16(unsigned long field)
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{
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int offset = get_evmcs_offset(field, NULL);
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if (offset < 0)
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return 0;
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return *(u16 *)((char *)current_evmcs + offset);
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}
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static inline void evmcs_load(u64 phys_addr)
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{
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struct hv_vp_assist_page *vp_ap =
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hv_get_vp_assist_page(smp_processor_id());
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if (current_evmcs->hv_enlightenments_control.nested_flush_hypercall)
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vp_ap->nested_control.features.directhypercall = 1;
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vp_ap->current_nested_vmcs = phys_addr;
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vp_ap->enlighten_vmentry = 1;
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}
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void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf);
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#else /* !IS_ENABLED(CONFIG_HYPERV) */
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static __always_inline bool kvm_is_using_evmcs(void) { return false; }
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static __always_inline void evmcs_write64(unsigned long field, u64 value) {}
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static __always_inline void evmcs_write32(unsigned long field, u32 value) {}
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static __always_inline void evmcs_write16(unsigned long field, u16 value) {}
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static __always_inline u64 evmcs_read64(unsigned long field) { return 0; }
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static __always_inline u32 evmcs_read32(unsigned long field) { return 0; }
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static __always_inline u16 evmcs_read16(unsigned long field) { return 0; }
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static inline void evmcs_load(u64 phys_addr) {}
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#endif /* IS_ENABLED(CONFIG_HYPERV) */
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#endif /* __ARCH_X86_KVM_VMX_ONHYPERV_H__ */
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