linux-kernel - [PATCH v2 0/3] svm: avic: Allow AVIC support on system w/ physical APIC ID

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Message-ID: <20211202235825.12562-1-suravee.suthikulpanit@amd.com>
Date:   Thu, 2 Dec 2021 17:58:22 -0600
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     <linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>,
        <x86@...nel.org>
CC:     <pbonzini@...hat.com>, <joro@...tes.org>, <seanjc@...gle.com>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
        <peterz@...radead.org>, <hpa@...or.com>, <thomas.lendacky@....com>,
        <jon.grimm@....com>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: [PATCH v2 0/3] svm: avic: Allow AVIC support on system w/ physical APIC ID > 255

Originally, AMD SVM AVIC supports 8-bit host physical APIC ID.
However, newer AMD systems can have physical APIC ID larger than 255,
and AVIC hardware has been extended to support upto the maximum physical
APIC ID available in the system.

This series introduces a helper function in the APIC subsystem to get
the maximum physical APIC ID allowing the SVM AVIC driver to calculate
the number of bits to program the host physical APIC ID in the AVIC
physical APIC ID table entry.

Regards,
Suravee Suthikulpanit

Changes from V1 (https://lkml.org/lkml/2021/11/10/243) :

 * Refactor AVIC hardware setup code into a helper function to simplify
   logic for enabling AVIC. (patch 1/3)

 * Simplify the logic in avic_init_host_physical_apicid_mask() by 
   by removing the CPUID[0xb,0x1] check for processor level APIC ID
   mask. (patch 3/3)

Suravee Suthikulpanit (3):
  KVM: SVM: Refactor AVIC hardware setup logic into helper function
  x86/apic: Add helper function to get maximum physical APIC ID
  KVM: SVM: Extend host physical APIC ID field to support more than
    8-bit

 arch/x86/include/asm/apic.h |  1 +
 arch/x86/kernel/apic/apic.c |  6 ++++++
 arch/x86/kvm/svm/avic.c     | 38 +++++++++++++++++++++++++++++--------
 arch/x86/kvm/svm/svm.c      |  8 +-------
 arch/x86/kvm/svm/svm.h      |  2 +-
 5 files changed, 39 insertions(+), 16 deletions(-)

-- 
2.25.1