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From: Paolo Bonzini <pbonzini@redhat.com>
To: Jon Doron <arilou@gmail.com>,
	kvm@vger.kernel.org, linux-hyperv@vger.kernel.org
Cc: vkuznets@redhat.com
Subject: Re: [PATCH v11 5/7] x86/kvm/hyper-v: enable hypercalls without hypercall page with syndbg
Date: Fri, 29 May 2020 12:48:25 +0200
Message-ID: <7ad6cc8a-7c4a-f556-4f59-704234ce73cb@redhat.com> (raw)
In-Reply-To: <20200424113746.3473563-6-arilou@gmail.com>

On 24/04/20 13:37, Jon Doron wrote:
> diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
> index 435516595090..524b5466a515 100644
> --- a/arch/x86/kvm/hyperv.c
> +++ b/arch/x86/kvm/hyperv.c
> @@ -1650,7 +1650,10 @@ static u64 kvm_hv_send_ipi(struct kvm_vcpu *current_vcpu, u64 ingpa, u64 outgpa,
>  
>  bool kvm_hv_hypercall_enabled(struct kvm *kvm)
>  {
> -	return READ_ONCE(kvm->arch.hyperv.hv_hypercall) & HV_X64_MSR_HYPERCALL_ENABLE;
> +	struct kvm_hv *hv = &kvm->arch.hyperv;
> +
> +	return READ_ONCE(hv->hv_hypercall) & HV_X64_MSR_HYPERCALL_ENABLE ||
> +	       (hv->hv_syndbg.active && READ_ONCE(hv->hv_guest_os_id) != 0);
>  }

Here too we could just shrug and allow hypercalls if the guest OS is not
NULL.

Paolo


  parent reply index

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-24 11:37 [PATCH v11 0/7] x86/kvm/hyper-v: add support for synthetic debugger Jon Doron
2020-04-24 11:37 ` [PATCH v11 1/7] x86/kvm/hyper-v: Explicitly align hcall param for kvm_hyperv_exit Jon Doron
2020-05-13  8:42   ` Roman Kagan
2020-04-24 11:37 ` [PATCH v11 2/7] x86/kvm/hyper-v: Simplify addition for custom cpuid leafs Jon Doron
2020-05-13  9:24   ` Roman Kagan
2020-05-13 12:49     ` Jon Doron
2020-05-29 11:13       ` Paolo Bonzini
2020-04-24 11:37 ` [PATCH v11 3/7] x86/hyper-v: Add synthetic debugger definitions Jon Doron
2020-04-24 11:37 ` [PATCH v11 4/7] x86/kvm/hyper-v: Add support for synthetic debugger capability Jon Doron
2020-05-29 10:46   ` Paolo Bonzini
2020-05-29 12:08     ` Vitaly Kuznetsov
2020-05-29 12:17       ` Paolo Bonzini
2020-04-24 11:37 ` [PATCH v11 5/7] x86/kvm/hyper-v: enable hypercalls without hypercall page with syndbg Jon Doron
2020-05-13  9:57   ` Roman Kagan
2020-05-13 12:37     ` Jon Doron
2020-05-29 10:48   ` Paolo Bonzini [this message]
2020-04-24 11:37 ` [PATCH v11 6/7] x86/kvm/hyper-v: Add support for synthetic debugger via hypercalls Jon Doron
2020-05-12 15:33   ` Roman Kagan
2020-05-13 12:39     ` Jon Doron
2020-04-24 11:37 ` [PATCH v11 7/7] KVM: selftests: update hyperv_cpuid with SynDBG tests Jon Doron
2020-05-07  3:01 ` [PATCH v11 0/7] x86/kvm/hyper-v: add support for synthetic debugger Jon Doron
2020-05-07  7:57   ` Paolo Bonzini

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