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hw/xen: Add xen_evtchn device for event channel emulation

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Include basic support for setting HVM_PARAM_CALLBACK_IRQ to the global
vector method HVM_PARAM_CALLBACK_TYPE_VECTOR, which is handled in-kernel
by raising the vector whenever the vCPU's vcpu_info->evtchn_upcall_pending
flag is set.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
This commit is contained in:
David Woodhouse 2022-12-16 14:02:29 +00:00
parent 5dbcd01a8d
commit 91cce75617
5 changed files with 194 additions and 1 deletions
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15
target/i386/kvm/xen-emu.c
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@ -22,6 +22,7 @@
#include "sysemu/runstate.h"
#include "hw/i386/kvm/xen_overlay.h"
#include "hw/i386/kvm/xen_evtchn.h"
#include "hw/xen/interface/version.h"
#include "hw/xen/interface/sched.h"
@ -510,6 +511,10 @@ static bool handle_set_param(struct kvm_xen_exit *exit, X86CPU *cpu,
}
switch (hp.index) {
case HVM_PARAM_CALLBACK_IRQ:
err = xen_evtchn_set_callback_param(hp.value);
xen_set_long_mode(exit->u.hcall.longmode);
break;
default:
return false;
}
@ -719,6 +724,16 @@ int kvm_xen_soft_reset(void)
trace_kvm_xen_soft_reset();
/*
* Zero is the reset/startup state for HVM_PARAM_CALLBACK_IRQ. Strictly,
* it maps to HVM_PARAM_CALLBACK_TYPE_GSI with GSI#0, but Xen refuses to
* to deliver to the timer interrupt and treats that as 'disabled'.
*/
err = xen_evtchn_set_callback_param(0);
if (err) {
return err;
}
CPU_FOREACH(cpu) {
async_run_on_cpu(cpu, do_vcpu_soft_reset, RUN_ON_CPU_NULL);
}