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0f02bd0ade
A missing VMCS12 was not causing -EINVAL (it was just read with copy_from_user, so it is not a security issue, but it is still wrong). Test for VMCS12 validity and reject the nested state if a VMCS12 is required but not present. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
293 lines
8.8 KiB
C
293 lines
8.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __KVM_X86_VMX_NESTED_H
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#define __KVM_X86_VMX_NESTED_H
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#include "kvm_cache_regs.h"
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#include "vmcs12.h"
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#include "vmx.h"
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/*
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* Status returned by nested_vmx_enter_non_root_mode():
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*/
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enum nvmx_vmentry_status {
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NVMX_VMENTRY_SUCCESS, /* Entered VMX non-root mode */
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NVMX_VMENTRY_VMFAIL, /* Consistency check VMFail */
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NVMX_VMENTRY_VMEXIT, /* Consistency check VMExit */
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NVMX_VMENTRY_KVM_INTERNAL_ERROR,/* KVM internal error */
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};
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void vmx_leave_nested(struct kvm_vcpu *vcpu);
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void nested_vmx_setup_ctls_msrs(struct nested_vmx_msrs *msrs, u32 ept_caps);
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void nested_vmx_hardware_unsetup(void);
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__init int nested_vmx_hardware_setup(int (*exit_handlers[])(struct kvm_vcpu *));
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void nested_vmx_set_vmcs_shadowing_bitmap(void);
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void nested_vmx_free_vcpu(struct kvm_vcpu *vcpu);
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enum nvmx_vmentry_status nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu,
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bool from_vmentry);
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bool nested_vmx_reflect_vmexit(struct kvm_vcpu *vcpu);
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void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 vm_exit_reason,
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u32 exit_intr_info, unsigned long exit_qualification);
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void nested_sync_vmcs12_to_shadow(struct kvm_vcpu *vcpu);
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int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
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int vmx_get_vmx_msr(struct nested_vmx_msrs *msrs, u32 msr_index, u64 *pdata);
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int get_vmx_mem_address(struct kvm_vcpu *vcpu, unsigned long exit_qualification,
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u32 vmx_instruction_info, bool wr, int len, gva_t *ret);
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void nested_vmx_pmu_entry_exit_ctls_update(struct kvm_vcpu *vcpu);
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void nested_mark_vmcs12_pages_dirty(struct kvm_vcpu *vcpu);
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bool nested_vmx_check_io_bitmaps(struct kvm_vcpu *vcpu, unsigned int port,
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int size);
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static inline struct vmcs12 *get_vmcs12(struct kvm_vcpu *vcpu)
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{
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return to_vmx(vcpu)->nested.cached_vmcs12;
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}
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static inline struct vmcs12 *get_shadow_vmcs12(struct kvm_vcpu *vcpu)
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{
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return to_vmx(vcpu)->nested.cached_shadow_vmcs12;
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}
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/*
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* Note: the same condition is checked against the state provided by userspace
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* in vmx_set_nested_state; if it is satisfied, the nested state must include
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* the VMCS12.
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*/
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static inline int vmx_has_valid_vmcs12(struct kvm_vcpu *vcpu)
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{
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struct vcpu_vmx *vmx = to_vmx(vcpu);
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/*
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* In case we do two consecutive get/set_nested_state()s while L2 was
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* running hv_evmcs may end up not being mapped (we map it from
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* nested_vmx_run()/vmx_vcpu_run()). Check is_guest_mode() as we always
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* have vmcs12 if it is true.
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*/
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return is_guest_mode(vcpu) || vmx->nested.current_vmptr != -1ull ||
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vmx->nested.hv_evmcs;
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}
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static inline u16 nested_get_vpid02(struct kvm_vcpu *vcpu)
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{
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struct vcpu_vmx *vmx = to_vmx(vcpu);
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return vmx->nested.vpid02 ? vmx->nested.vpid02 : vmx->vpid;
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}
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static inline unsigned long nested_ept_get_eptp(struct kvm_vcpu *vcpu)
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{
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/* return the page table to be shadowed - in our case, EPT12 */
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return get_vmcs12(vcpu)->ept_pointer;
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}
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static inline bool nested_ept_ad_enabled(struct kvm_vcpu *vcpu)
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{
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return nested_ept_get_eptp(vcpu) & VMX_EPTP_AD_ENABLE_BIT;
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}
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/*
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* Return the cr0 value that a nested guest would read. This is a combination
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* of the real cr0 used to run the guest (guest_cr0), and the bits shadowed by
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* its hypervisor (cr0_read_shadow).
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*/
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static inline unsigned long nested_read_cr0(struct vmcs12 *fields)
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{
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return (fields->guest_cr0 & ~fields->cr0_guest_host_mask) |
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(fields->cr0_read_shadow & fields->cr0_guest_host_mask);
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}
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static inline unsigned long nested_read_cr4(struct vmcs12 *fields)
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{
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return (fields->guest_cr4 & ~fields->cr4_guest_host_mask) |
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(fields->cr4_read_shadow & fields->cr4_guest_host_mask);
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}
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static inline unsigned nested_cpu_vmx_misc_cr3_count(struct kvm_vcpu *vcpu)
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{
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return vmx_misc_cr3_count(to_vmx(vcpu)->nested.msrs.misc_low);
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}
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/*
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* Do the virtual VMX capability MSRs specify that L1 can use VMWRITE
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* to modify any valid field of the VMCS, or are the VM-exit
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* information fields read-only?
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*/
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static inline bool nested_cpu_has_vmwrite_any_field(struct kvm_vcpu *vcpu)
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{
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return to_vmx(vcpu)->nested.msrs.misc_low &
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MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS;
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}
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static inline bool nested_cpu_has_zero_length_injection(struct kvm_vcpu *vcpu)
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{
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return to_vmx(vcpu)->nested.msrs.misc_low & VMX_MISC_ZERO_LEN_INS;
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}
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static inline bool nested_cpu_supports_monitor_trap_flag(struct kvm_vcpu *vcpu)
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{
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return to_vmx(vcpu)->nested.msrs.procbased_ctls_high &
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CPU_BASED_MONITOR_TRAP_FLAG;
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}
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static inline bool nested_cpu_has_vmx_shadow_vmcs(struct kvm_vcpu *vcpu)
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{
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return to_vmx(vcpu)->nested.msrs.secondary_ctls_high &
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SECONDARY_EXEC_SHADOW_VMCS;
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}
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static inline bool nested_cpu_has(struct vmcs12 *vmcs12, u32 bit)
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{
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return vmcs12->cpu_based_vm_exec_control & bit;
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}
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static inline bool nested_cpu_has2(struct vmcs12 *vmcs12, u32 bit)
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{
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return (vmcs12->cpu_based_vm_exec_control &
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CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) &&
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(vmcs12->secondary_vm_exec_control & bit);
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}
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static inline bool nested_cpu_has_preemption_timer(struct vmcs12 *vmcs12)
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{
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return vmcs12->pin_based_vm_exec_control &
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PIN_BASED_VMX_PREEMPTION_TIMER;
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}
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static inline bool nested_cpu_has_nmi_exiting(struct vmcs12 *vmcs12)
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{
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return vmcs12->pin_based_vm_exec_control & PIN_BASED_NMI_EXITING;
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}
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static inline bool nested_cpu_has_virtual_nmis(struct vmcs12 *vmcs12)
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{
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return vmcs12->pin_based_vm_exec_control & PIN_BASED_VIRTUAL_NMIS;
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}
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static inline int nested_cpu_has_mtf(struct vmcs12 *vmcs12)
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{
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return nested_cpu_has(vmcs12, CPU_BASED_MONITOR_TRAP_FLAG);
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}
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static inline int nested_cpu_has_ept(struct vmcs12 *vmcs12)
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{
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return nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_EPT);
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}
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static inline bool nested_cpu_has_xsaves(struct vmcs12 *vmcs12)
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{
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return nested_cpu_has2(vmcs12, SECONDARY_EXEC_XSAVES);
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}
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static inline bool nested_cpu_has_pml(struct vmcs12 *vmcs12)
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{
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return nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_PML);
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}
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static inline bool nested_cpu_has_virt_x2apic_mode(struct vmcs12 *vmcs12)
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{
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return nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE);
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}
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static inline bool nested_cpu_has_vpid(struct vmcs12 *vmcs12)
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{
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return nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_VPID);
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}
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static inline bool nested_cpu_has_apic_reg_virt(struct vmcs12 *vmcs12)
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{
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return nested_cpu_has2(vmcs12, SECONDARY_EXEC_APIC_REGISTER_VIRT);
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}
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static inline bool nested_cpu_has_vid(struct vmcs12 *vmcs12)
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{
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return nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY);
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}
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static inline bool nested_cpu_has_posted_intr(struct vmcs12 *vmcs12)
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{
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return vmcs12->pin_based_vm_exec_control & PIN_BASED_POSTED_INTR;
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}
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static inline bool nested_cpu_has_vmfunc(struct vmcs12 *vmcs12)
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{
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return nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_VMFUNC);
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}
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static inline bool nested_cpu_has_eptp_switching(struct vmcs12 *vmcs12)
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{
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return nested_cpu_has_vmfunc(vmcs12) &&
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(vmcs12->vm_function_control &
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VMX_VMFUNC_EPTP_SWITCHING);
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}
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static inline bool nested_cpu_has_shadow_vmcs(struct vmcs12 *vmcs12)
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{
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return nested_cpu_has2(vmcs12, SECONDARY_EXEC_SHADOW_VMCS);
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}
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static inline bool nested_cpu_has_save_preemption_timer(struct vmcs12 *vmcs12)
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{
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return vmcs12->vm_exit_controls &
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VM_EXIT_SAVE_VMX_PREEMPTION_TIMER;
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}
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static inline bool nested_exit_on_nmi(struct kvm_vcpu *vcpu)
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{
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return nested_cpu_has_nmi_exiting(get_vmcs12(vcpu));
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}
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/*
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* In nested virtualization, check if L1 asked to exit on external interrupts.
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* For most existing hypervisors, this will always return true.
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*/
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static inline bool nested_exit_on_intr(struct kvm_vcpu *vcpu)
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{
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return get_vmcs12(vcpu)->pin_based_vm_exec_control &
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PIN_BASED_EXT_INTR_MASK;
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}
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/*
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* if fixed0[i] == 1: val[i] must be 1
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* if fixed1[i] == 0: val[i] must be 0
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*/
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static inline bool fixed_bits_valid(u64 val, u64 fixed0, u64 fixed1)
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{
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return ((val & fixed1) | fixed0) == val;
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}
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static inline bool nested_guest_cr0_valid(struct kvm_vcpu *vcpu, unsigned long val)
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{
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u64 fixed0 = to_vmx(vcpu)->nested.msrs.cr0_fixed0;
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u64 fixed1 = to_vmx(vcpu)->nested.msrs.cr0_fixed1;
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struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
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if (to_vmx(vcpu)->nested.msrs.secondary_ctls_high &
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SECONDARY_EXEC_UNRESTRICTED_GUEST &&
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nested_cpu_has2(vmcs12, SECONDARY_EXEC_UNRESTRICTED_GUEST))
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fixed0 &= ~(X86_CR0_PE | X86_CR0_PG);
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return fixed_bits_valid(val, fixed0, fixed1);
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}
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static inline bool nested_host_cr0_valid(struct kvm_vcpu *vcpu, unsigned long val)
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{
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u64 fixed0 = to_vmx(vcpu)->nested.msrs.cr0_fixed0;
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u64 fixed1 = to_vmx(vcpu)->nested.msrs.cr0_fixed1;
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return fixed_bits_valid(val, fixed0, fixed1);
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}
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static inline bool nested_cr4_valid(struct kvm_vcpu *vcpu, unsigned long val)
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{
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u64 fixed0 = to_vmx(vcpu)->nested.msrs.cr4_fixed0;
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u64 fixed1 = to_vmx(vcpu)->nested.msrs.cr4_fixed1;
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return fixed_bits_valid(val, fixed0, fixed1);
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}
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/* No difference in the restrictions on guest and host CR4 in VMX operation. */
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#define nested_guest_cr4_valid nested_cr4_valid
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#define nested_host_cr4_valid nested_cr4_valid
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extern struct kvm_x86_nested_ops vmx_nested_ops;
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#endif /* __KVM_X86_VMX_NESTED_H */
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