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The issue appears with more than one vCPU (e.g. -smp 2); with - > smp 1 shutdown completes normally in my tests. The same guest shutdown > path works with an older host kernel ( avoided with current QEMU master or by cherry-picking a specific QEMU > commit onto v10.2.2. > > Environment: > Host kernel: linux-next, tag next-20260319 [1] (also observed starting > from next-20260304). > Guest: SEV-ES Linux guest; -smp 2 (or more) reproduces the issue; -smp 1 > does not in my testing. > Hypervisor / QEMU: Initially QEMU v10.2.2 (stable). Later tested QEMU > master at 8e711856d763 [2]. > > Details on issue: > > After SEV-ES guest shutdown , the serial log shows a register dump > (example below) . > > [   12.613383] reboot: Power down^M > EAX=00000000 EBX=00000000 ECX=00000000 EDX=00a00f11 > ESI=00000000 EDI=00000000 EBP=00000000 ESP=00000000 > EIP=0000b004 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=1 > ES =0000 00000000 0000ffff 00009300 > CS =f000 00800000 0000ffff 00009b00 > SS =0000 00000000 0000ffff 00009300 > DS =0000 00000000 0000ffff 00009300 > FS =0000 00000000 0000ffff 00009300 > GS =0000 00000000 0000ffff 00009300 > LDT=0000 00000000 0000ffff 00008200 > TR =0000 00000000 0000ffff 00008b00 > GDT=     00000000 0000ffff > IDT=     00000000 0000ffff > CR0=60000010 CR2=00000000 CR3=00000000 CR4=00000000 > DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 > DR3=0000000000000000 > DR6=00000000ffff0ff0 DR7=0000000000000400 > EFER=0000000000000000 > Code=b0 96 b5 61 ca ef 3f 51 00 c3 65 51 19 77 b1 e0 e5 e2 91 b8 <0c> 5d > c7 fc 59 bc 2b 6f 90 89 44 23 ec ec 2f 62 fd e0 8f d5 c7 31 24 70 e2 7d > c6 ee 00 00 > -> Hangs here > > Host kernel bisect (with QEMU v10.2.2) led to: > > Good (no crash on guest shutdown): > 32d76cdfa1222c88262da5b12e0b2bba444c96fa > KVM: SVM: Move core EFER.SVME enablement to kernel (local build tagged > 7.0.0-rc232d76cdfa1222 during testing.) > > Bad (crash reproduced): > 428afac5a8ea9c55bb8408e02dc92b8f85bf5f30 > KVM: x86: Move bulk of emergency virtualization logic to virt subsystem Any chance you have the enable_virt_at_load module option set to false? > > So the first bad commit in my host kernel bisect was 428afac5a8ea. The > commit prior [32d76cdfa122] did not have this issue. > > Later I used QEMU master and with same linux-next next-20260319 as host, > it did not reproduce the shutdown issue .. that was using QEMU master [2]. > > QEMU master contains 56d89db2cfd82c53439778fbf39294bf35194dba (target/ > i386: convert SEV-ES termination requests to guest panic events). > Cherry-picking that commit onto QEMU v10.2.2 resolved or at least > avoided the shutdown crash in my setup. Well, if it is converting a guest termination request, that is still not good. It should be a clean shutdown. > > > Questions: > > KVM: Is the interaction/issue with older QEMU (e.g. v10.2.2) expected > here, or is there anything that should be adjusted or documented > following 428afac5a8ea, like for multi-vCPU SEV-ES guests? > QEMU: Would a stable backport of 56d89db2cfd8 to 10.2.x (or equivalent > handling of SEV-ES termination) be appropriate for users staying on > stable QEMU while moving to newer host kernels? That wouldn't actually solve the issue, it is just a much more user friendly error message. Is there a termination event in the host dmesg log? Thanks, Tom > > Thank you, > > Srikanth Aithal > > References > > [1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git > — next-20260319 > [2] https://gitlab.com/qemu-project/qemu — master 8e711856d763 > >