add 18th iteration of classifier

1 files changed, 74 insertions, 0 deletions

diff --git a/results/classifier/118/virtual/2025586 b/results/classifier/118/virtual/2025586
new file mode 100644
index 000000000..ebccc768d
--- /dev/null
+++ b/results/classifier/118/virtual/2025586
@@ -0,0 +1,74 @@
+virtual: 0.942
+x86: 0.918
+device: 0.909
+performance: 0.848
+kernel: 0.791
+mistranslation: 0.776
+architecture: 0.766
+PID: 0.762
+hypervisor: 0.751
+files: 0.750
+graphic: 0.749
+KVM: 0.740
+semantic: 0.693
+VMM: 0.691
+network: 0.663
+socket: 0.650
+permissions: 0.640
+ppc: 0.609
+register: 0.609
+peripherals: 0.598
+vnc: 0.593
+debug: 0.551
+user-level: 0.549
+risc-v: 0.548
+TCG: 0.454
+arm: 0.429
+boot: 0.399
+i386: 0.377
+assembly: 0.250
+
+Align the iov length to the logical block size
+
+[Impact]
+When the logical block size of the virtual block device is smaller than the block device it is backed by on the host,
+qemu encounters a situation where it needs to bounce unaligned buffers during the use of direct IO.
+In the past, the logical block size happened to align with the memory page offset, leading qemu to mistakenly use the memory offset as the block size.
+However, a kernel commit b1a000d3b8ec resolved this issue by separating memory alignment from the logical block size.
+As a result, qemu now has an incorrect understanding of the minimum vector size.
+
+[Fix]
+Upstream commit 25474d90aa50 fixed this issue.
+==========
+Author:     Keith Busch <email address hidden>
+CommitDate: Fri Sep 30 18:43:44 2022 +0200
+
+    block: use the request length for iov alignment
+
+    An iov length needs to be aligned to the logical block size, which may
+    be larger than the memory alignment.
+
+    Tested-by: Jens Axboe <email address hidden>
+    Signed-off-by: Keith Busch <email address hidden>
+    Message-Id: <email address hidden>
+    Reviewed-by: Kevin Wolf <email address hidden>
+    Signed-off-by: Kevin Wolf <email address hidden>
+==========
+
+[Test Plan]
+1. Get a ubuntu image and convert it to RAW format
+wget https://cloud-images.ubuntu.com/jammy/current/jammy-server-cloudimg-amd64-disk-kvm.img
+qemu-img convert jammy-server-cloudimg-amd64-disk-kvm.img jammy-server-cloudimg-amd64-disk-kvm.raw
+2. Set up a loop device with RAW image
+losetup -b 4096 -f jammy-server-cloudimg-amd64-disk-kvm.raw
+3. Get loop device number by `losetup -a` command
+4. Start the virtual machine
+qemu-system-x86_64 -enable-kvm -drive file=/dev/loopX,format=raw,cache=none --nographic
+
+[Where problems could occur]
+The patch addressed the issue of misusing the memory offset as the block size.
+This problem only occurred when the cache option was set to "none" and the Linux kernel being used had the commit b1a000d3b8ec.
+However, it is worth noting that the patch also worked effectively with older kernels.
+
+[Other Info]
+