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Since the kvm_dirty_ring_enabled function accesses a null kvm_state pointer when the KVM acceleration parameter is not specified, running calc_dirty_rate with the -r or -b option causes a segmentation fault. Signed-off-by: Masato Imai <mii@sfc.wide.ad.jp> Message-ID: <20240507025010.1968881-1-mii@sfc.wide.ad.jp> [Assert kvm_state when kvm_dirty_ring_enabled was called to fix it. - Hyman] Signed-off-by: Hyman Huang <yong.huang@smartx.com>