Re: [PATCH v6 15/38] KVM: x86: Introduce .hv_inject_synthetic_vmexit_post_tlb_flush() nested hook

[Maxim Levitsky]

On Mon, 2022-06-06 at 10:36 +0200, Vitaly Kuznetsov wrote:
> Hyper-V supports injecting synthetic L2->L1 exit after performing
> L2 TLB flush operation but the procedure is vendor specific. Introduce
> .hv_inject_synthetic_vmexit_post_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 02bef551dafb..5d60c66ee0de 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -1603,6 +1603,7 @@ 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 (*hv_inject_synthetic_vmexit_post_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..911f51021af1
> --- /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_hv_inject_synthetic_vmexit_post_tlb_flush(struct kvm_vcpu *vcpu)
> +{
> +}
> diff --git a/arch/x86/kvm/svm/hyperv.h b/arch/x86/kvm/svm/hyperv.h
> index 8cf702fed7e5..dd2e393f84a0 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_hv_inject_synthetic_vmexit_post_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 e8908cc56e22..28b63663e1d9 100644
> --- a/arch/x86/kvm/svm/nested.c
> +++ b/arch/x86/kvm/svm/nested.c
> @@ -1721,4 +1721,5 @@ 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,
> +       .hv_inject_synthetic_vmexit_post_tlb_flush = svm_hv_inject_synthetic_vmexit_post_tlb_flush,
>  };
> diff --git a/arch/x86/kvm/vmx/evmcs.c b/arch/x86/kvm/vmx/evmcs.c
> index 6a61b1ae7942..805afc170b5b 100644
> --- a/arch/x86/kvm/vmx/evmcs.c
> +++ b/arch/x86/kvm/vmx/evmcs.c
> @@ -439,3 +439,7 @@ int nested_enable_evmcs(struct kvm_vcpu *vcpu,
>  
>         return 0;
>  }
> +
> +void vmx_hv_inject_synthetic_vmexit_post_tlb_flush(struct kvm_vcpu *vcpu)
> +{
> +}
> diff --git a/arch/x86/kvm/vmx/evmcs.h b/arch/x86/kvm/vmx/evmcs.h
> index f886a8ff0342..584741b85eb6 100644
> --- a/arch/x86/kvm/vmx/evmcs.h
> +++ b/arch/x86/kvm/vmx/evmcs.h
> @@ -245,5 +245,6 @@ 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_hv_inject_synthetic_vmexit_post_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 6e264a7f205b..4a827b3d929a 100644
> --- a/arch/x86/kvm/vmx/nested.c
> +++ b/arch/x86/kvm/vmx/nested.c
> @@ -6863,4 +6863,5 @@ 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,
> +       .hv_inject_synthetic_vmexit_post_tlb_flush = vmx_hv_inject_synthetic_vmexit_post_tlb_flush,
>  };


Reviewed-by: Maxim Levitsky <mlevitsk@xxxxxxxxxx>

Best regards,
	Maxim Levitsky