linux-kernel - [PATCH v3 0/3] svm: avic: Allow AVIC support on system w/ physical APIC ID

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 13 Dec 2021 05:31:07 -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>,
        <mlevitsk@...hat.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 v3 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 V2 (https://www.spinics.net/lists/kvm/msg261351.html)

 * Use global variable npt_enabled instead (patch 1/3)

 * Use BIT_ULL() instead of BIT() since avic_host_physical_id_mask
   is 64-bit value (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