einj_mem_uc: add extra arguments to support guest error injection
To support Guest Error injection, add two extra arguments:
- '-j': skip error injection, this step should do with host physical
address on host which creates GPA->HPA mappings for the guest.
- '-k': kick off trigger by writing a file from remote (host).
The steps to inject guest error are:
STEP 1: start a VM with a stdio monitor which allows giving complex
commands to the QEMU emulator.
qemu-system-aarch64 -enable-kvm \
-cpu host \
-M virt,gic-version=3 \
-m 8G \
-d guest_errors \
-rtc base=localtime,clock=host \
-smp cores=2,threads=2,sockets=2 \
-object memory-backend-ram,id=mem0,size=4G \
-object memory-backend-ram,id=mem1,size=4G \
-numa node,memdev=mem0,cpus=0-3,nodeid=0 \
-numa node,memdev=mem1,cpus=4-7,nodeid=1 \
-bios /usr/share/AAVMF/AAVMF_CODE.fd \
-drive driver=qcow2,media=disk,cache=writeback,if=virtio,id=alinu1_rootfs,file=/path/to/image.qcow2 \
-netdev user,id=n1,hostfwd=tcp::5555-:22 \
-serial telnet:localhost:4321,server,nowait \
-device virtio-net-pci,netdev=n1 \
-monitor stdio
QEMU 7.2.0 monitor - type 'help' for more information
(qemu) VNC server running on 127.0.0.1:5900
STEP 2: login guest and install ras-tools, then run `einj_mem_uc` to
allocate a page in userspace, dumps the virtual and physical address of the
page. The `-j` is to skip error injection and `-k` is to wait for a kick.
$ ./einj_mem_uc single -j -k
0: single vaddr = 0xffffbd88c400 paddr = 151f21400
STEP 3: run command `gpa2hpa` in QEMU monitor and it will print the host
physical address at which the guest's physical address addr is mapped.
(qemu) gpa2hpa 0x151f21400
Host physical address for 0x151f21400 (mem1) is 0x935757400
STEP 4: inject an uncorrected error via the APEI interface to the finally
translated host physical address on host.
echo 0x949a84400 > /sys/kernel/debug/apei/einj/param1
echo 0xfffffffffffff000 > /sys/kernel/debug/apei/einj/param2
echo 0x0 > /sys/kernel/debug/apei/einj/flags
echo 0x10 > /sys/kernel/debug/apei/einj/error_type
echo 1 > /sys/kernel/debug/apei/einj/notrigger
echo 1 > /sys/kernel/debug/apei/einj/error_inject
STEP 5: then kick `einj_mem_uc` to trigger the error by writing
"trigger_start". In this example, the kick is done on host.
ssh -p 5555 root@localhost "echo trigger > ~/trigger_start"
STEP 6: We will observe that the QEMU process exit.
(qemu) qemu-system-aarch64: Hardware memory error!
Signed-off-by: zhangyangzeyu.zyzy <xiaoque@linux.alibaba.com>
Signed-off-by: Shuai Xue <xueshuai@linux.alibaba.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
2 files changed
