Hi everyone,
This series implements x2APIC mode in userspace local APIC and the
RDMSR/WRMSR helper to access x2APIC registers in x2APIC mode. Intel iommu
and AMD iommu are adjusted to support x2APIC interrupt remapping. With this
series, we can now boot Linux kernel into x2APIC mode with TCG accelerator
using either Intel or AMD iommu.
Testing to boot my own built Linux 6.3.0-rc2, the kernel successfully boot
with enabled x2APIC and can enumerate CPU with APIC ID 257
Using Intel IOMMU
qemu/build/qemu-system-x86_64 \
-smp 2,maxcpus=260 \
-cpu qemu64,x2apic=on \
-machine q35 \
-device intel-iommu,intremap=on,eim=on \
-device qemu64-x86_64-cpu,x2apic=on,core-id=257,socket-id=0,thread-id=0 \
-m 2G \
-kernel $KERNEL_DIR \
-append "nokaslr console=ttyS0 root=/dev/sda earlyprintk=serial
net.ifnames=0" \
-drive file=$IMAGE_DIR,format=raw \
-nographic \
-s
Using AMD IOMMU
qemu/build/qemu-system-x86_64 \
-smp 2,maxcpus=260 \
-cpu qemu64,x2apic=on \
-machine q35 \
-device amd-iommu,intremap=on,xtsup=on \
-device qemu64-x86_64-cpu,x2apic=on,core-id=257,socket-id=0,thread-id=0 \
-m 2G \
-kernel $KERNEL_DIR \
-append "nokaslr console=ttyS0 root=/dev/sda earlyprintk=serial
net.ifnames=0" \
-drive file=$IMAGE_DIR,format=raw \
-nographic \
-s
Testing the emulated userspace APIC with kvm-unit-tests, disable test
device with this patch
diff --git a/lib/x86/fwcfg.c b/lib/x86/fwcfg.c
index 1734afb..f56fe1c 100644
--- a/lib/x86/fwcfg.c
+++ b/lib/x86/fwcfg.c
@@ -27,6 +27,7 @@ static void read_cfg_override(void)
if ((str = getenv("TEST_DEVICE")))
no_test_device = !atol(str);
+ no_test_device = true;
if ((str = getenv("MEMLIMIT")))
fw_override[FW_CFG_MAX_RAM] = atol(str) * 1024 * 1024;
~ env QEMU=/home/minh/Desktop/oss/qemu/build/qemu-system-x86_64 ACCEL=tcg \
./run_tests.sh -v -g apic
TESTNAME=apic-split TIMEOUT=90s ACCEL=tcg ./x86/run x86/apic.flat -smp 2
-cpu qemu64,+x2apic,+tsc-deadline -machine kernel_irqchip=split FAIL
apic-split (54 tests, 8 unexpected failures, 1 skipped)
TESTNAME=ioapic-split TIMEOUT=90s ACCEL=tcg ./x86/run x86/ioapic.flat -smp
1 -cpu qemu64 -machine kernel_irqchip=split PASS ioapic-split (19 tests)
TESTNAME=x2apic TIMEOUT=30 ACCEL=tcg ./x86/run x86/apic.flat -smp 2 -cpu
qemu64,+x2apic,+tsc-deadline FAIL x2apic (54 tests, 8 unexpected failures,
1 skipped) TESTNAME=xapic TIMEOUT=60 ACCEL=tcg ./x86/run x86/apic.flat -smp
2 -cpu qemu64,-x2apic,+tsc-deadline -machine pit=off FAIL xapic (43 tests,
6 unexpected failures, 2 skipped)
FAIL: apic_disable: *0xfee00030: 50014
FAIL: apic_disable: *0xfee00080: f0
FAIL: apic_disable: *0xfee00030: 50014
FAIL: apic_disable: *0xfee00080: f0
FAIL: apicbase: relocate apic
These errors are because we don't disable MMIO region when switching to
x2APIC and don't support relocate MMIO region yet. This is a problem
because, MMIO region is the same for all CPUs, in order to support these we
need to figure out how to allocate and manage different MMIO regions for
each CPUs. This can be an improvement in the future.
FAIL: nmi-after-sti
FAIL: multiple nmi
These errors are in the way we handle CPU_INTERRUPT_NMI in core TCG.
FAIL: TMCCT should stay at zero
This error is related to APIC timer which should be addressed in separate
patch.
Version 9 changes,
