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hyperv: add synic event flag signaling 

Add infrastructure to signal SynIC event flags by atomically setting the
corresponding bit in the event flags page and firing a SINT if
necessary.

Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
Message-Id: <20180921082217.29481-7-rkagan@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Roman Kagan 2018-09-21 11:22:13 +03:00 committed by Paolo Bonzini
parent 4cbaf3c133
commit f5642f8b45
2 changed files with 36 additions and 0 deletions
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32
hw/hyperv/hyperv.c
View File

@ -12,6 +12,7 @@
#include "qapi/error.h"
#include "exec/address-spaces.h"
#include "sysemu/kvm.h"
#include "qemu/bitops.h"
#include "hw/hyperv/hyperv.h"
typedef struct SynICState {
@ -310,6 +311,37 @@ static void sint_ack_handler(EventNotifier *notifier)
aio_bh_schedule_oneshot(qemu_get_aio_context(), sint_msg_bh, sint_route);
}
/*
* Set given event flag for a given sint on a given vcpu, and signal the sint.
*/
int hyperv_set_event_flag(HvSintRoute *sint_route, unsigned eventno)
{
int ret;
SynICState *synic = sint_route->synic;
unsigned long *flags, set_mask;
unsigned set_idx;
if (eventno > HV_EVENT_FLAGS_COUNT) {
return -EINVAL;
}
if (!synic->enabled || !synic->event_page_addr) {
return -ENXIO;
}
set_idx = BIT_WORD(eventno);
set_mask = BIT_MASK(eventno);
flags = synic->event_page->slot[sint_route->sint].flags;
if ((atomic_fetch_or(&flags[set_idx], set_mask) & set_mask) != set_mask) {
memory_region_set_dirty(&synic->event_page_mr, 0,
sizeof(*synic->event_page));
ret = hyperv_sint_route_set_sint(sint_route);
} else {
ret = 0;
}
return ret;
}
HvSintRoute *hyperv_sint_route_new(uint32_t vp_index, uint32_t sint,
HvSintMsgCb cb, void *cb_data)
{

4
include/hw/hyperv/hyperv.h
View File

@ -34,6 +34,10 @@ int hyperv_sint_route_set_sint(HvSintRoute *sint_route);
* with the @sint_route; until then no more messages are accepted.
*/
int hyperv_post_msg(HvSintRoute *sint_route, struct hyperv_message *msg);
/*
* Set event flag @eventno, and signal the SINT if the flag has changed.
*/
int hyperv_set_event_flag(HvSintRoute *sint_route, unsigned eventno);
static inline uint32_t hyperv_vp_index(CPUState *cs)
{