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3fa5e8fd0a
Right now, svm_hv_vmcb_dirty_nested_enlightenments has an incorrect dereference of vmcb->control.reserved_sw before the vmcb is checked for being non-NULL. The compiler is usually sinking the dereference after the check; instead of doing this ourselves in the source, ensure that svm_hv_vmcb_dirty_nested_enlightenments is only called with a non-NULL VMCB. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Cc: Vineeth Pillai <viremana@linux.microsoft.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> [Untested for now due to issues with my AMD machine. - Paolo]
131 lines
3.2 KiB
C
131 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* KVM L1 hypervisor optimizations on Hyper-V for SVM.
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*/
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#ifndef __ARCH_X86_KVM_SVM_ONHYPERV_H__
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#define __ARCH_X86_KVM_SVM_ONHYPERV_H__
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#if IS_ENABLED(CONFIG_HYPERV)
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#include <asm/mshyperv.h>
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#include "hyperv.h"
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#include "kvm_onhyperv.h"
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static struct kvm_x86_ops svm_x86_ops;
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/*
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* Hyper-V uses the software reserved 32 bytes in VMCB
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* control area to expose SVM enlightenments to guests.
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*/
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struct hv_enlightenments {
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struct __packed hv_enlightenments_control {
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u32 nested_flush_hypercall:1;
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u32 msr_bitmap:1;
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u32 enlightened_npt_tlb: 1;
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u32 reserved:29;
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} __packed hv_enlightenments_control;
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u32 hv_vp_id;
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u64 hv_vm_id;
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u64 partition_assist_page;
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u64 reserved;
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} __packed;
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/*
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* Hyper-V uses the software reserved clean bit in VMCB
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*/
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#define VMCB_HV_NESTED_ENLIGHTENMENTS VMCB_SW
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int svm_hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu);
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static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
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{
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struct hv_enlightenments *hve =
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(struct hv_enlightenments *)vmcb->control.reserved_sw;
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if (npt_enabled &&
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ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB)
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hve->hv_enlightenments_control.enlightened_npt_tlb = 1;
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}
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static inline void svm_hv_hardware_setup(void)
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{
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if (npt_enabled &&
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ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) {
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pr_info("kvm: Hyper-V enlightened NPT TLB flush enabled\n");
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svm_x86_ops.tlb_remote_flush = hv_remote_flush_tlb;
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svm_x86_ops.tlb_remote_flush_with_range =
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hv_remote_flush_tlb_with_range;
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}
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if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) {
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int cpu;
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pr_info("kvm: Hyper-V Direct TLB Flush enabled\n");
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for_each_online_cpu(cpu) {
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struct hv_vp_assist_page *vp_ap =
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hv_get_vp_assist_page(cpu);
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if (!vp_ap)
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continue;
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vp_ap->nested_control.features.directhypercall = 1;
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}
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svm_x86_ops.enable_direct_tlbflush =
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svm_hv_enable_direct_tlbflush;
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}
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}
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static inline void svm_hv_vmcb_dirty_nested_enlightenments(
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struct kvm_vcpu *vcpu)
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{
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struct vmcb *vmcb = to_svm(vcpu)->vmcb;
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struct hv_enlightenments *hve =
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(struct hv_enlightenments *)vmcb->control.reserved_sw;
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/*
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* vmcb can be NULL if called during early vcpu init.
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* And its okay not to mark vmcb dirty during vcpu init
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* as we mark it dirty unconditionally towards end of vcpu
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* init phase.
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*/
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if (vmcb_is_clean(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS) &&
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hve->hv_enlightenments_control.msr_bitmap)
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vmcb_mark_dirty(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS);
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}
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static inline void svm_hv_update_vp_id(struct vmcb *vmcb,
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struct kvm_vcpu *vcpu)
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{
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struct hv_enlightenments *hve =
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(struct hv_enlightenments *)vmcb->control.reserved_sw;
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u32 vp_index = kvm_hv_get_vpindex(vcpu);
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if (hve->hv_vp_id != vp_index) {
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hve->hv_vp_id = vp_index;
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vmcb_mark_dirty(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS);
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}
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}
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#else
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static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
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{
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}
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static inline void svm_hv_hardware_setup(void)
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{
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}
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static inline void svm_hv_vmcb_dirty_nested_enlightenments(
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struct kvm_vcpu *vcpu)
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{
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}
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static inline void svm_hv_update_vp_id(struct vmcb *vmcb,
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struct kvm_vcpu *vcpu)
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{
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}
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#endif /* CONFIG_HYPERV */
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#endif /* __ARCH_X86_KVM_SVM_ONHYPERV_H__ */
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