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Matsunaga" , Jan Dakinevich , Vadim Rozenfeld , "Denis V. Lunev" , si-wei liu , Paolo Bonzini , Vitaly Kuznetsov , Cathy Avery Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" 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 --- target/i386/hyperv.h | 2 ++ target/i386/hyperv.c | 32 ++++++++++++++++++++++++++++++++ 2 files changed, 34 insertions(+) diff --git a/target/i386/hyperv.h b/target/i386/hyperv.h index df17d9c3b7..3d942e5524 100644 --- a/target/i386/hyperv.h +++ b/target/i386/hyperv.h @@ -41,4 +41,6 @@ bool hyperv_synic_usable(void); int hyperv_post_msg(HvSintRoute *sint_route, struct hyperv_message *msg); +int hyperv_set_evt_flag(HvSintRoute *sint_route, unsigned evtno); + #endif diff --git a/target/i386/hyperv.c b/target/i386/hyperv.c index 918ba26849..b557cd5d5d 100644 --- a/target/i386/hyperv.c +++ b/target/i386/hyperv.c @@ -18,6 +18,7 @@ #include "hw/qdev-properties.h" #include "exec/address-spaces.h" #include "sysemu/cpus.h" +#include "qemu/bitops.h" #include "migration/vmstate.h" #include "hyperv.h" #include "hyperv-proto.h" @@ -209,6 +210,37 @@ int hyperv_post_msg(HvSintRoute *sint_route, struct hyperv_message *src_msg) return 0; } +/* + * Set given event flag for a given sint on a given vcpu, and signal the sint. + */ +int hyperv_set_evt_flag(HvSintRoute *sint_route, unsigned evtno) +{ + int ret; + SynICState *synic = sint_route->synic; + unsigned long *flags, set_mask; + unsigned set_idx; + + if (evtno > HV_EVENT_FLAGS_COUNT) { + return -EINVAL; + } + if (!synic->enabled || !synic->evt_page_addr) { + return -ENXIO; + } + + set_idx = BIT_WORD(evtno); + set_mask = BIT_MASK(evtno); + flags = synic->evt_page->slot[sint_route->sint].flags; + + if ((atomic_fetch_or(&flags[set_idx], set_mask) & set_mask) != set_mask) { + memory_region_set_dirty(&synic->evt_page_mr, 0, + sizeof(*synic->evt_page)); + ret = kvm_hv_sint_route_set_sint(sint_route); + } else { + ret = 0; + } + return ret; +} + static void async_synic_update(CPUState *cs, run_on_cpu_data data) { SynICState *synic = data.host_ptr;