linux-kernel - [PATCH v2 0/8] Fix x2apic enablement and allow up to 32768 CPUs without IR where supported

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Date:   Fri,  9 Oct 2020 11:46:08 +0100
From:   David Woodhouse <dwmw2@...radead.org>
To:     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>,
        linux-hyperv@...r.kernel.org
Subject: [PATCH v2 0/8] Fix x2apic enablement and allow up to 32768 CPUs without IR where supported


Fix the conditions for enabling x2apic on guests without interrupt 
remapping, and support 15-bit Extended Destination ID to allow 32768 
CPUs without IR on hypervisors that support it.

The last patch in the series now makes io_apic.c generate its RTE from 
the MSI message created by the parent irqchip, and removes all the nasty 
hackery where IRQ remapping drivers would frob I/OAPIC RTEs for 
themselves directly. It's last because I'd quite like to see it tested 
especially with Hyper-V and it doesn't actually eliminate the need for 
io_apic.c to know about the 15-bit extension anyway.

v2:
 • Minor cleanups.
 • Move __irq_msi_compose_msg() to apic.c, make virt_ext_dest_id static.
 • Generate I/OAPIC RTE directly from parent irqchip's MSI messages.
 • Clean up HPET MSI support into hpet.c now that we can.

David Woodhouse (8):
      x86/apic: Fix x2apic enablement without interrupt remapping
      x86/msi: Only use high bits of MSI address for DMAR unit
      x86/apic: Always provide irq_compose_msi_msg() method for vector domain
      x86/ioapic: Handle Extended Destination ID field in RTE
      x86/apic: Support 15 bits of APIC ID in MSI where available
      x86/kvm: Add KVM_FEATURE_MSI_EXT_DEST_ID
      x86/hpet: Move MSI support into hpet.c
      x86/ioapic: Generate RTE directly from parent irqchip's MSI message

 Documentation/virt/kvm/cpuid.rst     |   4 +
 arch/x86/include/asm/apic.h          |   9 +--
 arch/x86/include/asm/hpet.h          |  11 ---
 arch/x86/include/asm/hw_irq.h        |  11 ++-
 arch/x86/include/asm/io_apic.h       |   3 +-
 arch/x86/include/asm/msidef.h        |   2 +
 arch/x86/include/asm/x86_init.h      |   2 +
 arch/x86/include/uapi/asm/kvm_para.h |   1 +
 arch/x86/kernel/apic/apic.c          |  68 ++++++++++++++--
 arch/x86/kernel/apic/io_apic.c       |  66 +++++++++------
 arch/x86/kernel/apic/msi.c           | 152 +++--------------------------------
 arch/x86/kernel/apic/vector.c        |   6 ++
 arch/x86/kernel/apic/x2apic_phys.c   |   9 +++
 arch/x86/kernel/hpet.c               | 116 ++++++++++++++++++++++++--
 arch/x86/kernel/kvm.c                |   6 ++
 arch/x86/kernel/x86_init.c           |   1 +
 drivers/iommu/amd/iommu.c            |  14 ----
 drivers/iommu/hyperv-iommu.c         |  31 -------
 drivers/iommu/intel/irq_remapping.c  |  19 ++---
 19 files changed, 276 insertions(+), 255 deletions(-)