linux-kernel - [PATCH 0/5] Fix x2apic enablement and allow up to 32768 CPUs without IR where supported

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Date:   Wed, 07 Oct 2020 13:20:20 +0100
From:   David Woodhouse <dwmw2@...radead.org>
To:     x86 <x86@...nel.org>
Cc:     kvm <kvm@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>,
        Paolo Bonzini <pbonzini@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/5] Fix x2apic enablement and allow up to 32768 CPUs
 without IR where supported

Splitting out the simpler parts of my previous patch set. The full
support for per-irqdomain affinity limits will take a bit more work but
this part is quite simple.

Since we don't yet have per-irqdomain affinity, we currently attempt to
avoid bringing CPUs online at all if they can't be targeted by external
interrupts. Except we still let them get hotplugged later... which is
moderately suboptimal.

Fix that, and support the hypervisor enlightenment which at least
extends the range of targetable APIC IDs to 15 bits, as seen in the
patch at https://patchwork.kernel.org/patch/11816693/ for qemu.


David Woodhouse (5):
      x86/apic: Fix x2apic enablement without interrupt remapping
      x86/msi: Only use high bits of MSI address for DMAR unit
      x86/ioapic: Handle Extended Destination ID field in RTE
      x86/apic: Support 15 bits of APIC ID in IOAPIC/MSI where available
      x86/kvm: Add KVM_FEATURE_MSI_EXT_DEST_ID

 Documentation/virt/kvm/cpuid.rst     |  4 ++++
 arch/x86/include/asm/apic.h          |  1 +
 arch/x86/include/asm/io_apic.h       |  3 ++-
 arch/x86/include/asm/mpspec.h        |  1 +
 arch/x86/include/asm/x86_init.h      |  2 ++
 arch/x86/include/uapi/asm/kvm_para.h |  1 +
 arch/x86/kernel/apic/apic.c          | 27 +++++++++++++++++++++------
 arch/x86/kernel/apic/io_apic.c       | 19 +++++++++++++------
 arch/x86/kernel/apic/msi.c           | 41 +++++++++++++++++++++++++++++++++++------
 arch/x86/kernel/apic/x2apic_phys.c   |  9 +++++++++
 arch/x86/kernel/kvm.c                |  6 ++++++
 arch/x86/kernel/x86_init.c           |  1 +
 12 files changed, 96 insertions(+), 19 deletions(-)

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