fix(bundle): Take the x86_64 kernel that boots on every vCPU - #15
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The amd64 kernel in hull-assets 0.1.6 leaves X86_X2APIC unset. cloud-hypervisor lists each vCPU as an x2APIC entry in the MADT, so that kernel ignores them, and an amd64 guest runs on one CPU whatever `brig run --cpus` asks for. hull-assets 0.1.7 builds X86_X2APIC in: - amd64: bzImage f00bcf35 (was a423bdb9), the same size - arm64: unchanged, Image e8bf35e4 Signed-off-by: Anastassios Nanos <ananos@nofire.ai>
ananos
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September 30, 2026 09:23
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Summary
The amd64 bundles from hull-assets 0.1.6 boot every guest on one CPU. That kernel leaves
X86_X2APICunset. cloud-hypervisor lists each vCPU as an x2APIC entry in the MADT, and the kernel ignores them:So
brig run --cpus 3starts cloud-hypervisor withboot=3, and the guest still reports one CPU. v0.1.0-rc12 ships that kernel. arm64 takes its CPUs from the device tree and is not affected.This patch moves the bundle to hull-assets 0.1.7, which builds
X86_X2APICin.Changes
scripts/build-bundle.sh:ASSETS_VERSIONmoves from 0.1.6 to 0.1.7.a423bdb9f00bcf35, the same sizee8bf35e4The initrd is the bundle's own and does not change.
Testing
The 0.1.7
linux-amd64artifact verifies against thebuild-assets.yml@refs/heads/mainidentity. Its kernel config differs from 0.1.6's inX86_X2APICalone, plus four symbols that depend on it and show as unset.The two kernels under the rc12 rootless bundle on an x86_64 KVM host, with
brig run --cpus 3:nproccpu/online/proc/cpuinfoa423bdb9)boot=3f00bcf35)boot=3CI builds the amd64 and arm64 bundles from 0.1.7.
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