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Lunev >=20 > On Zen 4 client parts (family 19h models 0x18-0x1f and 0x60-0x7f) the > 6.12 kernel clears virtualized VMSAVE/VMLOAD in init_amd_zen4(), which > some BIOSes trigger on reboot, and KVM stops offering v-vmsave-vmload. > A nested guest (svm=3Don) started before has it in its CPUID, and QEMU > filters it on such a host, so migration, restore and snapshot revert > fail. >=20 > Add x-v-vmsave-vmload-compat and turn it on in pc_vz_9_2_compat: an > AMD guest keeps a requested v-vmsave-vmload. This does not turn host > VLS back on: KVM keeps intercepting VMLOAD and VMSAVE of the nested > guest and emulates them (nested_vmcb_needs_vls_intercept()), which is > only slower. >=20 > Signed-off-by: Denis V. Lunev Sashiko has reviewed this patch and found no issues. It looks great! --=20 Sashiko AI review =C2=B7 https://sashiko.vzint.dev/#/patchset/2026102911343= 6.93521-1-den@openvz.org?part=3D5