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hyperv: Add support to process syndbg commands

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SynDbg commands can come from two different flows:
1. Hypercalls, in this mode the data being sent is fully
   encapsulated network packets.
2. SynDbg specific MSRs, in this mode only the data that needs to be
   transfered is passed.

Signed-off-by: Jon Doron <arilou@gmail.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-Id: <20220216102500.692781-4-arilou@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jon Doron 2022-02-16 12:24:59 +02:00 • committed by Paolo Bonzini
parent ccbdf5e81b
commit 73d2407407
8 changed files with 451 additions and 8 deletions
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52
target/i386/kvm/hyperv.c
View file

@ -81,20 +81,66 @@ int kvm_hv_handle_exit(X86CPU *cpu, struct kvm_hyperv_exit *exit)
case KVM_EXIT_HYPERV_HCALL: {
uint16_t code = exit->u.hcall.input & 0xffff;
bool fast = exit->u.hcall.input & HV_HYPERCALL_FAST;
uint64_t param = exit->u.hcall.params[0];
uint64_t in_param = exit->u.hcall.params[0];
uint64_t out_param = exit->u.hcall.params[1];
switch (code) {
case HV_POST_MESSAGE:
exit->u.hcall.result = hyperv_hcall_post_message(param, fast);
exit->u.hcall.result = hyperv_hcall_post_message(in_param, fast);
break;
case HV_SIGNAL_EVENT:
exit->u.hcall.result = hyperv_hcall_signal_event(param, fast);
exit->u.hcall.result = hyperv_hcall_signal_event(in_param, fast);
break;
case HV_POST_DEBUG_DATA:
exit->u.hcall.result =
hyperv_hcall_post_dbg_data(in_param, out_param, fast);
break;
case HV_RETRIEVE_DEBUG_DATA:
exit->u.hcall.result =
hyperv_hcall_retreive_dbg_data(in_param, out_param, fast);
break;
case HV_RESET_DEBUG_SESSION:
exit->u.hcall.result =
hyperv_hcall_reset_dbg_session(out_param);
break;
default:
exit->u.hcall.result = HV_STATUS_INVALID_HYPERCALL_CODE;
}
return 0;
}
case KVM_EXIT_HYPERV_SYNDBG:
if (!hyperv_feat_enabled(cpu, HYPERV_FEAT_SYNDBG)) {
return -1;
}
switch (exit->u.syndbg.msr) {
case HV_X64_MSR_SYNDBG_CONTROL: {
uint64_t control = exit->u.syndbg.control;
env->msr_hv_syndbg_control = control;
env->msr_hv_syndbg_send_page = exit->u.syndbg.send_page;
env->msr_hv_syndbg_recv_page = exit->u.syndbg.recv_page;
exit->u.syndbg.status = HV_STATUS_SUCCESS;
if (control & HV_SYNDBG_CONTROL_SEND) {
exit->u.syndbg.status =
hyperv_syndbg_send(env->msr_hv_syndbg_send_page,
HV_SYNDBG_CONTROL_SEND_SIZE(control));
} else if (control & HV_SYNDBG_CONTROL_RECV) {
exit->u.syndbg.status =
hyperv_syndbg_recv(env->msr_hv_syndbg_recv_page,
TARGET_PAGE_SIZE);
}
break;
}
case HV_X64_MSR_SYNDBG_PENDING_BUFFER:
env->msr_hv_syndbg_pending_page = exit->u.syndbg.pending_page;
hyperv_syndbg_set_pending_page(env->msr_hv_syndbg_pending_page);
break;
default:
return -1;
}
return 0;
default:
return -1;
}