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x86/kvm/hyper-v: Add support for synthetic debugger via hypercalls

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There is another mode for the synthetic debugger which uses hypercalls
to send/recv network data instead of the MSR interface.

This interface is much slower and less recommended since you might get
a lot of VMExits while KDVM polling for new packets to recv, rather
than simply checking the pending page to see if there is data avialble
and then request.

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Jon Doron <arilou@gmail.com>
Message-Id: <20200529134543.1127440-6-arilou@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jon Doron 2020-05-29 16:45:42 +03:00 committed by Paolo Bonzini
parent 45c38973ed
commit b187038b5e
1 changed files with 28 additions and 0 deletions
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28
arch/x86/kvm/hyperv.c
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@ -1835,6 +1835,34 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
}
ret = kvm_hv_send_ipi(vcpu, ingpa, outgpa, true, false);
break;
case HVCALL_POST_DEBUG_DATA:
case HVCALL_RETRIEVE_DEBUG_DATA:
if (unlikely(fast)) {
ret = HV_STATUS_INVALID_PARAMETER;
break;
}
fallthrough;
case HVCALL_RESET_DEBUG_SESSION: {
struct kvm_hv_syndbg *syndbg = vcpu_to_hv_syndbg(vcpu);
if (!kvm_hv_is_syndbg_enabled(vcpu)) {
ret = HV_STATUS_INVALID_HYPERCALL_CODE;
break;
}
if (!(syndbg->options & HV_X64_SYNDBG_OPTION_USE_HCALLS)) {
ret = HV_STATUS_OPERATION_DENIED;
break;
}
vcpu->run->exit_reason = KVM_EXIT_HYPERV;
vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL;
vcpu->run->hyperv.u.hcall.input = param;
vcpu->run->hyperv.u.hcall.params[0] = ingpa;
vcpu->run->hyperv.u.hcall.params[1] = outgpa;
vcpu->arch.complete_userspace_io =
kvm_hv_hypercall_complete_userspace;
return 0;
}
default:
ret = HV_STATUS_INVALID_HYPERCALL_CODE;
break;