Commit f5642f8b authored by Roman Kagan's avatar Roman Kagan Committed by Paolo Bonzini
Browse files

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: default avatarRoman Kagan <rkagan@virtuozzo.com>
Message-Id: <20180921082217.29481-7-rkagan@virtuozzo.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 4cbaf3c1

hw/hyperv/hyperv.c

+32 −0
Original line number Diff line number Diff line
@@ -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)

{

include/hw/hyperv/hyperv.h

+4 −0
Original line number Diff line number Diff line
@@ -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)

{