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KVM: x86/mmu: Declare flush_remote_tlbs{_range}() hooks iff HYPERV!=n

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Declare the kvm_x86_ops hooks used to wire up paravirt TLB flushes when
running under Hyper-V if and only if CONFIG_HYPERV!=n.  Wrapping yet more
code with IS_ENABLED(CONFIG_HYPERV) eliminates a handful of conditional
branches, and makes it super obvious why the hooks *might* be valid.

Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Link: https://lore.kernel.org/r/20231018192325.1893896-1-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2023-10-18 12:23:25 -07:00
parent e9e60c82fe
commit 0277022a77
3 changed files with 18 additions and 8 deletions
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2
arch/x86/include/asm/kvm-x86-ops.h
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@ -55,8 +55,10 @@ KVM_X86_OP(set_rflags)
KVM_X86_OP(get_if_flag)
KVM_X86_OP(flush_tlb_all)
KVM_X86_OP(flush_tlb_current)
#if IS_ENABLED(CONFIG_HYPERV)
KVM_X86_OP_OPTIONAL(flush_remote_tlbs)
KVM_X86_OP_OPTIONAL(flush_remote_tlbs_range)
#endif
KVM_X86_OP(flush_tlb_gva)
KVM_X86_OP(flush_tlb_guest)
KVM_X86_OP(vcpu_pre_run)

12
arch/x86/include/asm/kvm_host.h
View File

@ -1614,9 +1614,11 @@ struct kvm_x86_ops {
void (*flush_tlb_all)(struct kvm_vcpu *vcpu);
void (*flush_tlb_current)(struct kvm_vcpu *vcpu);
#if IS_ENABLED(CONFIG_HYPERV)
int (*flush_remote_tlbs)(struct kvm *kvm);
int (*flush_remote_tlbs_range)(struct kvm *kvm, gfn_t gfn,
gfn_t nr_pages);
#endif
/*
* Flush any TLB entries associated with the given GVA.
@ -1825,6 +1827,7 @@ static inline struct kvm *kvm_arch_alloc_vm(void)
#define __KVM_HAVE_ARCH_VM_FREE
void kvm_arch_free_vm(struct kvm *kvm);
#if IS_ENABLED(CONFIG_HYPERV)
#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS
static inline int kvm_arch_flush_remote_tlbs(struct kvm *kvm)
{
@ -1836,6 +1839,15 @@ static inline int kvm_arch_flush_remote_tlbs(struct kvm *kvm)
}
#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE
static inline int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn,
u64 nr_pages)
{
if (!kvm_x86_ops.flush_remote_tlbs_range)
return -EOPNOTSUPP;
return static_call(kvm_x86_flush_remote_tlbs_range)(kvm, gfn, nr_pages);
}
#endif /* CONFIG_HYPERV */
#define kvm_arch_pmi_in_guest(vcpu) \
((vcpu) && (vcpu)->arch.handling_intr_from_guest)

12
arch/x86/kvm/mmu/mmu.c
View File

@ -271,15 +271,11 @@ static inline unsigned long kvm_mmu_get_guest_pgd(struct kvm_vcpu *vcpu,
static inline bool kvm_available_flush_remote_tlbs_range(void)
{
#if IS_ENABLED(CONFIG_HYPERV)
return kvm_x86_ops.flush_remote_tlbs_range;
}
int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 nr_pages)
{
if (!kvm_x86_ops.flush_remote_tlbs_range)
return -EOPNOTSUPP;
return static_call(kvm_x86_flush_remote_tlbs_range)(kvm, gfn, nr_pages);
#else
return false;
#endif
}
static gfn_t kvm_mmu_page_get_gfn(struct kvm_mmu_page *sp, int index);