diff options
| -rw-r--r-- | kvm-all.c | 6 | ||||
| -rw-r--r-- | memory.c | 42 |
2 files changed, 46 insertions, 2 deletions
@@ -1628,8 +1628,10 @@ static int kvm_init(MachineState *ms) kvm_state = s; - s->memory_listener.listener.eventfd_add = kvm_mem_ioeventfd_add; - s->memory_listener.listener.eventfd_del = kvm_mem_ioeventfd_del; + if (kvm_eventfds_allowed) { + s->memory_listener.listener.eventfd_add = kvm_mem_ioeventfd_add; + s->memory_listener.listener.eventfd_del = kvm_mem_ioeventfd_del; + } s->memory_listener.listener.coalesced_mmio_add = kvm_coalesce_mmio_region; s->memory_listener.listener.coalesced_mmio_del = kvm_uncoalesce_mmio_region; @@ -18,12 +18,14 @@ #include "exec/ioport.h" #include "qapi/visitor.h" #include "qemu/bitops.h" +#include "qemu/error-report.h" #include "qom/object.h" #include "trace.h" #include <assert.h> #include "exec/memory-internal.h" #include "exec/ram_addr.h" +#include "sysemu/kvm.h" #include "sysemu/sysemu.h" //#define DEBUG_UNASSIGNED @@ -1136,6 +1138,32 @@ MemTxResult memory_region_dispatch_read(MemoryRegion *mr, return r; } +/* Return true if an eventfd was signalled */ +static bool memory_region_dispatch_write_eventfds(MemoryRegion *mr, + hwaddr addr, + uint64_t data, + unsigned size, + MemTxAttrs attrs) +{ + MemoryRegionIoeventfd ioeventfd = { + .addr = addrrange_make(int128_make64(addr), int128_make64(size)), + .data = data, + }; + unsigned i; + + for (i = 0; i < mr->ioeventfd_nb; i++) { + ioeventfd.match_data = mr->ioeventfds[i].match_data; + ioeventfd.e = mr->ioeventfds[i].e; + + if (memory_region_ioeventfd_equal(ioeventfd, mr->ioeventfds[i])) { + event_notifier_set(ioeventfd.e); + return true; + } + } + + return false; +} + MemTxResult memory_region_dispatch_write(MemoryRegion *mr, hwaddr addr, uint64_t data, @@ -1149,6 +1177,11 @@ MemTxResult memory_region_dispatch_write(MemoryRegion *mr, adjust_endianness(mr, &data, size); + if ((!kvm_eventfds_enabled()) && + memory_region_dispatch_write_eventfds(mr, addr, data, size, attrs)) { + return MEMTX_OK; + } + if (mr->ops->write) { return access_with_adjusted_size(addr, &data, size, mr->ops->impl.min_access_size, @@ -1667,6 +1700,8 @@ void memory_region_clear_global_locking(MemoryRegion *mr) mr->global_locking = false; } +static bool userspace_eventfd_warning; + void memory_region_add_eventfd(MemoryRegion *mr, hwaddr addr, unsigned size, @@ -1683,6 +1718,13 @@ void memory_region_add_eventfd(MemoryRegion *mr, }; unsigned i; + if (kvm_enabled() && (!(kvm_eventfds_enabled() || + userspace_eventfd_warning))) { + userspace_eventfd_warning = true; + error_report("Using eventfd without MMIO binding in KVM. " + "Suboptimal performance expected"); + } + if (size) { adjust_endianness(mr, &mrfd.data, size); } |