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| author | Jon Doron <arilou@gmail.com> | 2020-05-29 16:45:42 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-06-01 04:26:11 -0400 |
| commit | b187038b5e3f8404dbafce89fd169e66fe604df4 (patch) | |
| tree | afa04fef30175b33e67c3ce58d33c31f64d3f6d0 /arch/x86/kvm | |
| parent | 45c38973ed1868b8448079edd48bf24ab8b326fa (diff) | |
| download | linux-b187038b5e3f8404dbafce89fd169e66fe604df4.tar.gz | |
x86/kvm/hyper-v: Add support for synthetic debugger via hypercalls
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>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/hyperv.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index 2fb1464a483f..4e1695db788a 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -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; |