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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 Cc: qemu-stable@nongnu.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> (cherry picked from commit 64e0e63ea16aa0122dc0c41a0679da0ae4616208) Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>