linux-kernel - Re: [RFC PATCH 00/13] Introducing AMD x2APIC Virtualization (x2AVIC) support.

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Date:   Tue, 22 Feb 2022 12:37:48 +0700
From:   "Suthikulpanit, Suravee" <suravee.suthikulpanit@....com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     pbonzini@...hat.com, seanjc@...gle.com, joro@...tes.org,
        jon.grimm@....com, wei.huang2@....com, terry.bowman@....com
Subject: Re: [RFC PATCH 00/13] Introducing AMD x2APIC Virtualization (x2AVIC)
 support.

On 2/21/2022 9:19 AM, Suravee Suthikulpanit wrote:
> Testing:
>    * This series has been tested booting a Linux VM with x2APIC physical
>      and logical modes upto 511 vCPUs.

Update:
   * This series has been tested booting a Linux VM with x2APIC physical
     and logical modes upto 512 vCPUs with the following change in QEMU:

diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 797e09500b..282036df98 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -352,7 +352,7 @@ static void pc_q35_machine_options(MachineClass *m)
      machine_class_allow_dynamic_sysbus_dev(m, TYPE_INTEL_IOMMU_DEVICE);
      machine_class_allow_dynamic_sysbus_dev(m, TYPE_RAMFB_DEVICE);
      machine_class_allow_dynamic_sysbus_dev(m, TYPE_VMBUS_BRIDGE);
-    m->max_cpus = 288;
+    m->max_cpus = 512;
  }

Regards,
Suravee