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KVM_CAP_READONLY_MEM used to be a global capability, but with the introduction of AMD SEV-SNP confidential VMs, this extension is not always available on all VM types [1,2]. Query the extension on the VM level instead of on the KVM level. [1] https://patchwork.kernel.org/project/kvm/patch/20240809190319.1710470-2-seanjc@google.com/ [2] https://patchwork.kernel.org/project/kvm/patch/20240902144219.3716974-1-erbse.13@gmx.de/ Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Tom Dohrmann <erbse.13@gmx.de> Link: https://lore.kernel.org/r/20240903062953.3926498-1-erbse.13@gmx.de Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Pankaj Gupta <pankaj.gupta@amd.com> References: bsc#1231519 (mailing list: https://lore.kernel.org/r/20241011085044.19004-1-pbonzini@redhat.com) Signed-off-by: Dario Faggioli <dfaggioli@suse.com>