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id = 743
title = "aarch64: Number of SMP CPUS exceeds max CPUs supported by machine (10 > 8) for M1 Pro/Max"
state = "closed"
created_at = "2021-11-23T01:25:52.101Z"
closed_at = "2024-04-18T09:08:36.323Z"
labels = ["accel: HVF", "target: arm"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/743"
host-os = "macOS Monterey 12.0.1"
host-arch = "ARM64"
qemu-version = "6.1.0"
guest-os = "N/A"
guest-arch = "ARM64"
description = """Trying to launch QEMU with more than 8 cores gives the following error:
`qemu-system-aarch64: Number of SMP CPUs requested (10) exceeds max CPUs supported by machine 'mach-virt' (8)`
Apple M1 Pro can have up to 10 cores while M1 Max only has 10 cores."""
reproduce = """1. Install QEMU via homebrew (or MacPorts or from source)
2. Run `qemu-system-aarch64 -machine virt,highmem=off -accel hvf -cpu cortex-a72 -smp 10`
3. Get error, QEMU doesn't start"""
additional = "n/a"
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