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Shutemov" , Paolo Bonzini , linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev, kvm@vger.kernel.org, Dan Williams , Xin Li , Kai Huang , Adrian Hunter Content-Type: text/plain; charset="us-ascii" On Mon, Oct 13, 2025, Chao Gao wrote: > >+void __init x86_virt_init(void) > >+{ > >+ cpu_emergency_virt_cb *vmx_cb = NULL, *svm_cb = NULL; > >+ > >+ if (x86_virt_is_vmx()) > >+ vmx_cb = x86_vmx_init(); > >+ > >+ if (x86_virt_is_svm()) > >+ svm_cb = x86_svm_init(); > >+ > >+ if (!vmx_cb && !svm_cb) > >+ return; > >+ > >+ if (WARN_ON_ONCE(vmx_cb && svm_cb)) > >+ return; > >+ > >+ cpu_emergency_register_virt_callback(vmx_cb ? : svm_cb); > > To be consistent with x86_virt_{get,put}_cpu(), perhaps we can have a common > emergency callback and let reboot.c call it directly, with the common callback > routing to svm/vmx code according to the hardware type. Oh, yeah, that's a much better idea, especially if x86_virt_init() runs unconditionally during boot (as proposed). cpu_emergency_disable_virtualization() can be dropped entirely (it'd just be a one-line wrapper).