[OSSTEST] linux: enable x2APIC kernel support

Commit Message

Roger Pau Monné April 6, 2020, 8:16 a.m. UTC

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
system.

Signed-off-by: Roger Pau Monné <[e-mail]>
---
 ts-kernel-build | 3 +++
 1 file changed, 3 insertions(+)

Comments

Ian Jackson April 6, 2020, 10:40 a.m. UTC | #1

Roger Pau Monne writes ("[PATCH OSSTEST] linux: enable x2APIC kernel support"):
> 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:

Acked-by: Ian Jackson <[e-mail]>

And pushed to pretest.

Thanks,
Ian.

Patch

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
 setopt CONFIG_TEGRA_HOST1X n
 
+# Enable x2APIC support for PVH mode
+setopt CONFIG_X86_X2APIC y
+
 exit 0
 END
 }