This is a grub bug and it is being tracked here:
[SRU] unable to boot guest with large memory when SEV is enabled on host
https://bugs.launchpad.net/ubuntu/+source/grub2-unsigned/+bug/1989446
** Changed in: linux (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1983625
Title:
5.15.0-1013-oracle: Unable to boot large memory SEV guest without
setting swiotlb parameter.
Status in linux package in Ubuntu:
Invalid
Bug description:
When launching a SEV Ubuntu22.04 guest with e.g. memory > 16876M, Ubuntu
kernel
5.15.0-1013-oracle panics unless swiotlb=262144 is specified on guest kernel
parameters. It seems that the kernel tries to adjust swiotlb buffer size but
can not do that and crashes. With a memory size such as 8G, the guest boots
fine.
HOST INFO
Host type : OCI Bare-Metal Server
Server/Machine: ORACLE SERVER E2-2c
CPU model : AMD EPYC 7742 64-Core Processor
Architecture : x86_64
Hostname : atanveer-amd-sme
OS : Oracle Linux Server release 7.9
Kernel : 5.4.17-2136.309.4.el7uek.x86_64 #2 SMP Tue Jun 28 17:35:13
PDT 2022
Hypervisor : QEMU emulator version 4.2.1 (qemu-4.2.1-18.oci.el7)
OVMF/AAVMF : OVMF-1.6.3-1.el7.noarch
Qemu command to launch SEV guest:
/bin/qemu-system-x86_64 -name OL22.04-uefi \
-machine q35 \
-enable-kvm \
-cpu host,+host-phys-bits \
-m 16877M \
-smp 8,maxcpus=240 \
-D ./22.04-uefi.log \
-nodefaults \
-monitor stdio \
-vnc 0.0.0.0:0,to=999 \
-vga std \
-drive
file=/usr/share/OVMF/OVMF_CODE.pure-efi.fd,index=0,if=pflash,format=raw,readonly
\
-drive file=OVMF_VARS.pure-efi.fd.ol22.04,index=1,if=pflash,format=raw \
-device
virtio-scsi-pci,id=virtio-scsi-pci0,disable-legacy=on,iommu_platform=true \
-drive
file=Ubuntu-22.04-2022.06.16-0-uefi-x86_64.qcow2,if=none,id=local_disk0,format=qcow2,media=disk
\
-device ide-hd,drive=local_disk0,id=local_disk1,bootindex=0 \
-qmp tcp:127.0.0.1:3334,server,nowait \
-serial telnet:127.0.0.1:3333,server,nowait \
-device virtio-rng-pci,disable-legacy=on,iommu_platform=true \
-object sev-guest,id=sev0,cbitpos=47,reduced-phys-bits=1 \
-machine memory-encryption=sev0
Console log:
[ 0.005025] software IO TLB: SWIOTLB bounce buffer size adjusted to 1011MB
[ 0.033881] kvm-guest: KVM setup pv remote TLB flush
[ 0.054931] software IO TLB: Cannot allocate buffer
[ 0.248933] Last level iTLB entries: 4KB 512, 2MB 255, 4MB 127
[ 0.249582] Last level dTLB entries: 4KB 512, 2MB 255, 4MB 127, 1GB 0
[ 0.317440] HugeTLB registered 1.00 GiB page size, pre-allocated 0 pages
[ 0.317440] HugeTLB registered 2.00 MiB page size, pre-allocated 0 pages
[ 0.424952] iommu: DMA domain TLB invalidation policy: lazy mode
[ 0.570923] PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
[ 0.571669] software IO TLB: No low mem
.
.
.
.
[ 1.233515] ata1: SATA max UDMA/133 abar m4096@0xc1010000 port 0xc1010100
irq 28
[ 1.234985] ata2: SATA max UDMA/133 abar m4096@0xc1010000 port 0xc1010180
irq 28
[ 1.236464] ata3: SATA max UDMA/133 abar m4096@0xc1010000 port 0xc1010200
irq 28
[ 1.237863] ata4: SATA max UDMA/133 abar m4096@0xc1010000 port 0xc1010280
irq 28
[ 1.239257] ata5: SATA max UDMA/133 abar m4096@0xc1010000 port 0xc1010300
irq 28
[ 1.240659] ata6: SATA max UDMA/133 abar m4096@0xc1010000 port 0xc1010380
irq 28
[ 1.555165] ata5: SATA link down (SStatus 0 SControl 300)
[ 1.556661] ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[ 1.558232] ata2: SATA link down (SStatus 0 SControl 300)
[ 1.559728] ata4: SATA link down (SStatus 0 SControl 300)
[ 1.560996] ata3: SATA link down (SStatus 0 SControl 300)
[ 1.562134] ata1: SATA link down (SStatus 0 SControl 300)
[ 1.563566] ata6.00: failed to IDENTIFY (INIT_DEV_PARAMS failed,
err_mask=0x80)
[ 6.911450] ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[ 6.912906] ata6.00: failed to IDENTIFY (INIT_DEV_PARAMS failed,
err_mask=0x80)
[ 12.288045] ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[ 12.289904] ata6.00: failed to IDENTIFY (INIT_DEV_PARAMS failed,
err_mask=0x80)
[ 17.663548] ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[ 242.883993] INFO: task kworker/u480:0:9 blocked for more than 120 seconds.
[ 242.885619] Not tainted 5.15.0-1013-oracle #17-Ubuntu
[ 242.886743] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 242.888198] task:kworker/u480:0 state:D stack: 0 pid: 9 ppid: 2
flags:0x00004000
[ 242.889703] Workqueue: events_unbound async_run_entry_fn
[ 242.890882] Call Trace:
[ 242.891727] <TASK>
Full console log is attached.
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