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authorChristian Krinitsin <mail@krinitsin.com>2025-07-06 16:43:19 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-07-06 16:43:19 +0000
commit238ec2b7cc1557d6f34c33cc482e4d0cd3e266dd (patch)
treecd8a1b75ba7b3543eb7fe6857f408e7be4d9fd0b /results/classifier/deepseek-r1:32b/reasoning/runtime/2304
parent96049c939b1916d80532630d63c14e04d5244f1d (diff)
downloadqemu-analysis-238ec2b7cc1557d6f34c33cc482e4d0cd3e266dd.tar.gz
qemu-analysis-238ec2b7cc1557d6f34c33cc482e4d0cd3e266dd.zip
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+<think>
+Alright, I'm trying to figure out how to classify this bug report for QEMU. Let me read through it again to make sure I understand the issue properly.
+
+The user is reporting that when they disable SVE (Scalable Vector Extension) using `-cpu max,sve=off` in QEMU, the system still reports SVE2 as enabled via `getauxval(AT_HWCAP2)`. This inconsistency is a problem because SVE is required for SVE2 to be valid. The user provided a small program that demonstrates this by checking both HWCAP and HWCAP2.
+
+From what I know, QEMU allows users to specify CPU features, including SVE. Disabling SVE should logically disable any extensions like SVE2 since they depend on it. However, the current behavior doesn't do that, which can lead to incorrect feature reporting in the guest OS or applications running inside.
+
+Looking at the categories provided: instruction, syscall, runtime. I need to determine where this bug fits.
+
+- **Instruction**: This would relate to how specific CPU instructions are handled. Since the issue is about feature flags being incorrectly set, it doesn't directly involve an instruction fault.
+  
+- **Syscall**: This category involves errors with system calls like read, write, etc. The problem here isn't a syscall error but rather incorrect reporting of hardware capabilities via `getauxval`.
+  
+- **Runtime**: This covers issues that occur during the execution or runtime environment setup. Since the problem is about how QEMU sets up the CPU features and their advertisement to the guest, it seems like a runtime issue because it affects the environment in which applications run.
+
+So, the bug relates to the configuration of CPU features at runtime, specifically when disabling SVE but still advertising SVE2. This misconfiguration affects what applications see when they query hardware capabilities, leading to potential issues where software assumes SVE is present if SVE2 is enabled.
+
+Therefore, this should fall under the **runtime** category because it's an error in how QEMU sets up the runtime environment regarding CPU features.
+</think>
+
+runtime
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