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author | Paolo Bonzini <pbonzini@redhat.com> | 2023-10-17 14:13:04 +0200 |
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committer | Paolo Bonzini <pbonzini@redhat.com> | 2023-10-25 17:35:15 +0200 |
commit | 126e7f780367b0263d9a112729736d6a0bd6d441 (patch) | |
tree | 0aef67081b061d11b1c2351aff7978abcdd0fdb4 /system | |
parent | 5d9ec1f4c78ed25720b4fd01ddcddb00db50fa6c (diff) | |
download | qemu-126e7f780367b0263d9a112729736d6a0bd6d441.zip qemu-126e7f780367b0263d9a112729736d6a0bd6d441.tar.gz qemu-126e7f780367b0263d9a112729736d6a0bd6d441.tar.bz2 |
kvm: require KVM_CAP_IOEVENTFD and KVM_CAP_IOEVENTFD_ANY_LENGTH
KVM_CAP_IOEVENTFD_ANY_LENGTH was added in Linux 4.4, released in 2016.
Assume that it is present.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'system')
-rw-r--r-- | system/memory.c | 16 |
1 files changed, 6 insertions, 10 deletions
diff --git a/system/memory.c b/system/memory.c index a800fbc..4928f25 100644 --- a/system/memory.c +++ b/system/memory.c @@ -1535,7 +1535,12 @@ MemTxResult memory_region_dispatch_write(MemoryRegion *mr, adjust_endianness(mr, &data, op); - if ((!kvm_eventfds_enabled()) && + /* + * FIXME: it's not clear why under KVM the write would be processed + * directly, instead of going through eventfd. This probably should + * test "tcg_enabled() || qtest_enabled()", or should just go away. + */ + if (!kvm_enabled() && memory_region_dispatch_write_eventfds(mr, addr, data, size, attrs)) { return MEMTX_OK; } @@ -2550,8 +2555,6 @@ void memory_region_clear_flush_coalesced(MemoryRegion *mr) } } -static bool userspace_eventfd_warning; - void memory_region_add_eventfd(MemoryRegion *mr, hwaddr addr, unsigned size, @@ -2568,13 +2571,6 @@ 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_memop(size) | MO_TE); } |