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Subject[PATCH RFC 12/19] KVM: x86: hyper-v: Introduce kvm_hv_is_tlb_flush_hcall()
Date
The newly introduced helper checks whether vCPU is performing a
Hyper-V TLB flush hypercall. This is required to filter out Direct TLB
flush hypercalls from L2 for processing.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/kvm/hyperv.h | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)

diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h
index 137f906eb8c3..0c0877a6aa74 100644
--- a/arch/x86/kvm/hyperv.h
+++ b/arch/x86/kvm/hyperv.h
@@ -168,6 +168,30 @@ static inline void kvm_hv_vcpu_empty_flush_tlb(struct kvm_vcpu *vcpu)
tlb_flush_ring = kvm_hv_get_tlb_flush_ring(vcpu);
tlb_flush_ring->read_idx = tlb_flush_ring->write_idx;
}
+
+static inline bool kvm_hv_is_tlb_flush_hcall(struct kvm_vcpu *vcpu)
+{
+ struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
+ u16 code;
+
+ if (!hv_vcpu)
+ return false;
+
+#ifdef CONFIG_X86_64
+ if (is_64_bit_hypercall(vcpu)) {
+ code = kvm_rcx_read(vcpu) & 0xffff;
+ } else
+#endif
+ {
+ code = kvm_rax_read(vcpu) & 0xffff;
+ }
+
+ return (code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE ||
+ code == HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST ||
+ code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX ||
+ code == HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX);
+}
+
void kvm_hv_vcpu_flush_tlb(struct kvm_vcpu *vcpu);


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2.35.1
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