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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2021-01-26 16:48:12 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-02-09 16:17:14 +0300 |
| commit | f2bc14b69c38b60f201fdf90c08cb2dc8966f331 (patch) | |
| tree | dd3309e39072fffc22670f5a43fb5bfedb53ec7d /arch/x86/kvm/hyperv.h | |
| parent | 9ff5e0304e949a8a4e584c8c2b11fad9b2e0b133 (diff) | |
| download | linux-f2bc14b69c38b60f201fdf90c08cb2dc8966f331.tar.xz | |
KVM: x86: hyper-v: Prepare to meet unallocated Hyper-V context
Currently, Hyper-V context is part of 'struct kvm_vcpu_arch' and is always
available. As a preparation to allocating it dynamically, check that it is
not NULL at call sites which can normally proceed without it i.e. the
behavior is identical to the situation when Hyper-V emulation is not being
used by the guest.
When Hyper-V context for a particular vCPU is not allocated, we may still
need to get 'vp_index' from there. E.g. in a hypothetical situation when
Hyper-V emulation was enabled on one CPU and wasn't on another, Hyper-V
style send-IPI hypercall may still be used. Luckily, vp_index is always
initialized to kvm_vcpu_get_idx() and can only be changed when Hyper-V
context is present. Introduce kvm_hv_get_vpindex() helper for
simplification.
No functional change intended.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20210126134816.1880136-12-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/hyperv.h')
| -rw-r--r-- | arch/x86/kvm/hyperv.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h index be1e3f5d1df6..57e53a88f5eb 100644 --- a/arch/x86/kvm/hyperv.h +++ b/arch/x86/kvm/hyperv.h @@ -83,6 +83,13 @@ static inline struct kvm_hv_syndbg *to_hv_syndbg(struct kvm_vcpu *vcpu) return &vcpu->kvm->arch.hyperv.hv_syndbg; } +static inline u32 kvm_hv_get_vpindex(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); + + return hv_vcpu ? hv_vcpu->vp_index : kvm_vcpu_get_idx(vcpu); +} + int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host); int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host); @@ -121,6 +128,9 @@ static inline bool kvm_hv_has_stimer_pending(struct kvm_vcpu *vcpu) { struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); + if (!hv_vcpu) + return false; + return !bitmap_empty(hv_vcpu->stimer_pending_bitmap, HV_SYNIC_STIMER_COUNT); } |