[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[PATCH OSSTEST] linux: enable x2APIC kernel support

  • To: <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Roger Pau Monne <roger.pau@xxxxxxxxxx>
  • Date: Mon, 6 Apr 2020 10:16:36 +0200
  • Authentication-results: esa5.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none; spf=None smtp.pra=roger.pau@xxxxxxxxxx; spf=Pass smtp.mailfrom=roger.pau@xxxxxxxxxx; spf=None smtp.helo=postmaster@xxxxxxxxxxxxxxx
  • Cc: ian.jackson@xxxxxxxxxxxxx, Roger Pau Monne <roger.pau@xxxxxxxxxx>
  • Delivery-date: Mon, 06 Apr 2020 08:17:12 +0000
  • Ironport-sdr: S0ZaVdOmSpMen520XGvGllSvFqBFrCHUWeyOMkZJOp0Wa+mh5B/uTdmmP9M7N0yxjapSvje53W bH6CDhha7KvQStjC6XMcXRyybAiRtxp3bU5IAUwL9bAi3zG+Jv5MmFG192HGaRBcYcXgAihZsx LFn5PoUN4DwdmSrYXjMVm5cqiRgETdieL9Fq6w/C1sellsT4n/CdcH31q+2fh1qJhZfzjmrrf5 /guyyUFVowbksTRIN5M/rP7mKqVrkxD0fD3HTn7C43xVU20UjLXp+3ZBs0X/URuavRtTMlNEVM dNM=
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

Without it Linux is not able to parse the x2APIC ACPI MADT entries
crafted by Xen when booted in PVH mode, following log is from one of
the dom0pvh jobs:

ACPI: x2apic entry ignored
ACPI: x2apic entry ignored
ACPI: x2apic entry ignored
ACPI: x2apic entry ignored
IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
IOAPIC[1]: apic_id 1, version 17, address 0xfec20000, GSI 24-55
ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level)
Using ACPI (MADT) for SMP configuration information
smpboot: Boot CPU (id 0) not listed by BIOS
smpboot: Allowing 1 CPUs, 0 hotplug CPUs

Note that PVH mode only creates x2APIC entries for simplicity, and
because x2APIC mode is always provided to PVH guests. Not adding
x2APIC support forces Linux to boot in UP mode, since x2APIC entries
contain the information of additional processors available on the

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
 ts-kernel-build | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ts-kernel-build b/ts-kernel-build
index 89cdafcb..6c8f1d6a 100755
--- a/ts-kernel-build
+++ b/ts-kernel-build
@@ -622,6 +622,9 @@ esac
 # Disable components that don't build
+# Enable x2APIC support for PVH mode
+setopt CONFIG_X86_X2APIC y
 exit 0



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.