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hyperv: add support for KVM_HYPERV_EVENTFD 

When setting up a notifier for Hyper-V event connection, try to use the
KVM-assisted one first, and fall back to userspace handling of the
hypercall if the kernel doesn't provide the requested feature.

Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
Message-Id: <20180921082217.29481-9-rkagan@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Roman Kagan 2018-09-21 11:22:15 +03:00 committed by Paolo Bonzini
parent e6ea9f45b7
commit 8d3bc0b753
1 changed files with 26 additions and 1 deletions
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27
hw/hyperv/hyperv.c
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@ -13,6 +13,7 @@
#include "exec/address-spaces.h"
#include "sysemu/kvm.h"
#include "qemu/bitops.h"
#include "qemu/error-report.h"
#include "qemu/queue.h"
#include "qemu/rcu.h"
#include "qemu/rcu_queue.h"
@ -470,7 +471,7 @@ static void __attribute__((constructor)) hv_init(void)
qemu_mutex_init(&handlers_mutex);
}
int hyperv_set_event_flag_handler(uint32_t conn_id, EventNotifier *notifier)
static int set_event_flag_handler(uint32_t conn_id, EventNotifier *notifier)
{
int ret;
EventFlagHandler *handler;
@ -503,6 +504,30 @@ unlock:
return ret;
}
static bool process_event_flags_userspace;
int hyperv_set_event_flag_handler(uint32_t conn_id, EventNotifier *notifier)
{
if (!process_event_flags_userspace &&
!kvm_check_extension(kvm_state, KVM_CAP_HYPERV_EVENTFD)) {
process_event_flags_userspace = true;
warn_report("Hyper-V event signaling is not supported by this kernel; "
"using slower userspace hypercall processing");
}
if (!process_event_flags_userspace) {
struct kvm_hyperv_eventfd hvevfd = {
.conn_id = conn_id,
.fd = notifier ? event_notifier_get_fd(notifier) : -1,
.flags = notifier ? 0 : KVM_HYPERV_EVENTFD_DEASSIGN,
};
return kvm_vm_ioctl(kvm_state, KVM_HYPERV_EVENTFD, &hvevfd);
}
return set_event_flag_handler(conn_id, notifier);
}
uint16_t hyperv_hcall_signal_event(uint64_t param, bool fast)
{
uint16_t ret;