linux-kernel - Re: [PATCH v3 30/34] KVM: selftests: Sync 'struct hv_vp_assist

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Date:   Wed, 11 May 2022 15:18:03 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        Siddharth Chandrasekaran <sidcha@...zon.de>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 30/34] KVM: selftests: Sync 'struct
 hv_vp_assist_page' definition with hyperv-tlfs.h

On Thu, 2022-04-14 at 15:20 +0200, Vitaly Kuznetsov wrote:
> 'struct hv_vp_assist_page' definition doesn't match TLFS. Also, define
> 'struct hv_nested_enlightenments_control' and use it instead of opaque
> '__u64'.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---
>  .../selftests/kvm/include/x86_64/evmcs.h      | 22 ++++++++++++++-----
>  1 file changed, 17 insertions(+), 5 deletions(-)
> 
> diff --git a/tools/testing/selftests/kvm/include/x86_64/evmcs.h b/tools/testing/selftests/kvm/include/x86_64/evmcs.h
> index b6067b555110..9c965ba73dec 100644
> --- a/tools/testing/selftests/kvm/include/x86_64/evmcs.h
> +++ b/tools/testing/selftests/kvm/include/x86_64/evmcs.h
> @@ -20,14 +20,26 @@
>  
>  extern bool enable_evmcs;
>  
> +struct hv_nested_enlightenments_control {
> +	struct {
> +		__u32 directhypercall:1;
> +		__u32 reserved:31;
> +	} features;
> +	struct {
> +		__u32 reserved;
> +	} hypercallControls;
> +} __packed;
> +
> +/* Define virtual processor assist page structure. */
>  struct hv_vp_assist_page {
>  	__u32 apic_assist;
> -	__u32 reserved;
> -	__u64 vtl_control[2];
> -	__u64 nested_enlightenments_control[2];
> -	__u32 enlighten_vmentry;
> +	__u32 reserved1;
> +	__u64 vtl_control[3];
> +	struct hv_nested_enlightenments_control nested_control;
> +	__u8 enlighten_vmentry;
> +	__u8 reserved2[7];
>  	__u64 current_nested_vmcs;
> -};
> +} __packed;
>  
>  struct hv_enlightened_vmcs {
>  	u32 revision_id;

Seems to match the spec.

Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>

Best regards,
	Maxim Levitsky