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authorOliver Upton <oliver.upton@linux.dev>2025-03-20 00:53:09 +0300
committerOliver Upton <oliver.upton@linux.dev>2025-03-20 00:53:16 +0300
commitd300b0168ea8fd5022a1413bd37ab63f4e5a7d4d (patch)
treeaa9e431f8b5db99e1a3c70dcec6c451108f1c62a /tools/perf/scripts/python/gecko.py
parent13f64f6d215ca229a615ef26cf452e38e22f4cdb (diff)
parent44ff44cadbd144ee1159f5687a852c49c4290262 (diff)
downloadlinux-d300b0168ea8fd5022a1413bd37ab63f4e5a7d4d.tar.xz
Merge branch 'kvm-arm64/pv-cpuid' into kvmarm/next
* kvm-arm64/pv-cpuid: : Paravirtualized implementation ID, courtesy of Shameer Kolothum : : Big-little has historically been a pain in the ass to virtualize. The : implementation ID (MIDR, REVIDR, AIDR) of a vCPU can change at the whim : of vCPU scheduling. This can be particularly annoying when the guest : needs to know the underlying implementation to mitigate errata. : : "Hyperscalers" face a similar scheduling problem, where VMs may freely : migrate between hosts in a pool of heterogenous hardware. And yes, our : server-class friends are equally riddled with errata too. : : In absence of an architected solution to this wart on the ecosystem, : introduce support for paravirtualizing the implementation exposed : to a VM, allowing the VMM to describe the pool of implementations that a : VM may be exposed to due to scheduling/migration. : : Userspace is expected to intercept and handle these hypercalls using the : SMCCC filter UAPI, should it choose to do so. smccc: kvm_guest: Fix kernel builds for 32 bit arm KVM: selftests: Add test for KVM_REG_ARM_VENDOR_HYP_BMAP_2 smccc/kvm_guest: Enable errata based on implementation CPUs arm64: Make  _midr_in_range_list() an exported function KVM: arm64: Introduce KVM_REG_ARM_VENDOR_HYP_BMAP_2 KVM: arm64: Specify hypercall ABI for retrieving target implementations arm64: Modify _midr_range() functions to read MIDR/REVIDR internally Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
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