Hyper-V supports injecting synthetic L2->L1 exit after performing
L2 TLB flush operation but the procedure is vendor specific.
Introduce .post_hv_l2_tlb_flush() nested hook for it.
Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/Makefile | 3 ++-
arch/x86/kvm/svm/hyperv.c | 11 +++++++++++
arch/x86/kvm/svm/hyperv.h | 2 ++
arch/x86/kvm/svm/nested.c | 1 +
arch/x86/kvm/vmx/evmcs.c | 4 ++++
arch/x86/kvm/vmx/evmcs.h | 1 +
arch/x86/kvm/vmx/nested.c | 1 +
8 files changed, 23 insertions(+), 1 deletion(-)
create mode 100644 arch/x86/kvm/svm/hyperv.c
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 8b2a52bf26c0..ce62fde5f4ff 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1558,6 +1558,7 @@ struct kvm_x86_nested_ops {
int (*enable_evmcs)(struct kvm_vcpu *vcpu,
uint16_t *vmcs_version);
uint16_t (*get_evmcs_version)(struct kvm_vcpu *vcpu);
+ void (*post_hv_l2_tlb_flush)(struct kvm_vcpu *vcpu);
};
struct kvm_x86_init_ops {
diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index 30f244b64523..b6d53b045692 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -25,7 +25,8 @@ kvm-intel-y += vmx/vmx.o vmx/vmenter.o vmx/pmu_intel.o vmx/vmcs12.o \
vmx/evmcs.o vmx/nested.o vmx/posted_intr.o
kvm-intel-$(CONFIG_X86_SGX_KVM) += vmx/sgx.o
-kvm-amd-y += svm/svm.o svm/vmenter.o svm/pmu.o svm/nested.o svm/avic.o svm/sev.o
+kvm-amd-y += svm/svm.o svm/vmenter.o svm/pmu.o svm/nested.o svm/avic.o \
+ svm/sev.o svm/hyperv.o
ifdef CONFIG_HYPERV
kvm-amd-y += svm/svm_onhyperv.o
diff --git a/arch/x86/kvm/svm/hyperv.c b/arch/x86/kvm/svm/hyperv.c
new file mode 100644
index 000000000000..c0749fc282fe
--- /dev/null
+++ b/arch/x86/kvm/svm/hyperv.c
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AMD SVM specific code for Hyper-V on KVM.
+ *
+ * Copyright 2022 Red Hat, Inc. and/or its affiliates.
+ */
+#include "hyperv.h"
+
+void svm_post_hv_l2_tlb_flush(struct kvm_vcpu *vcpu)
+{
+}
diff --git a/arch/x86/kvm/svm/hyperv.h b/arch/x86/kvm/svm/hyperv.h
index 8cf702fed7e5..a2b0d7580b0d 100644
--- a/arch/x86/kvm/svm/hyperv.h
+++ b/arch/x86/kvm/svm/hyperv.h
@@ -48,4 +48,6 @@ static inline void nested_svm_hv_update_vm_vp_ids(struct kvm_vcpu *vcpu)
hv_vcpu->nested.vp_id = hve->hv_vp_id;
}
+void svm_post_hv_l2_tlb_flush(struct kvm_vcpu *vcpu);
+
#endif /* __ARCH_X86_KVM_SVM_HYPERV_H__ */
diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index 2d1a76343404..de3f27301b5c 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -1665,4 +1665,5 @@ struct kvm_x86_nested_ops svm_nested_ops = {
.get_nested_state_pages = svm_get_nested_state_pages,
.get_state = svm_get_nested_state,
.set_state = svm_set_nested_state,
+ .post_hv_l2_tlb_flush = svm_post_hv_l2_tlb_flush,
};
diff --git a/arch/x86/kvm/vmx/evmcs.c b/arch/x86/kvm/vmx/evmcs.c
index 87e3dc10edf4..e390e67496df 100644
--- a/arch/x86/kvm/vmx/evmcs.c
+++ b/arch/x86/kvm/vmx/evmcs.c
@@ -437,3 +437,7 @@ int nested_enable_evmcs(struct kvm_vcpu *vcpu,
return 0;
}
+
+void vmx_post_hv_l2_tlb_flush(struct kvm_vcpu *vcpu)
+{
+}
diff --git a/arch/x86/kvm/vmx/evmcs.h b/arch/x86/kvm/vmx/evmcs.h
index 8d70f9aea94b..b120b0ead4f3 100644
--- a/arch/x86/kvm/vmx/evmcs.h
+++ b/arch/x86/kvm/vmx/evmcs.h
@@ -244,5 +244,6 @@ int nested_enable_evmcs(struct kvm_vcpu *vcpu,
uint16_t *vmcs_version);
void nested_evmcs_filter_control_msr(u32 msr_index, u64 *pdata);
int nested_evmcs_check_controls(struct vmcs12 *vmcs12);
+void vmx_post_hv_l2_tlb_flush(struct kvm_vcpu *vcpu);
#endif /* __KVM_X86_VMX_EVMCS_H */
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index ee88921c6156..cc6c944b5815 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -6850,4 +6850,5 @@ struct kvm_x86_nested_ops vmx_nested_ops = {
.write_log_dirty = nested_vmx_write_pml_buffer,
.enable_evmcs = nested_enable_evmcs,
.get_evmcs_version = nested_get_evmcs_version,
+ .post_hv_l2_tlb_flush = vmx_post_hv_l2_tlb_flush,
};
--
2.35.1
