Jan Kiszka wrote: > Marcelo Tosatti wrote: >> With kvm-autotest the failure is not sporadic (and the above commit >> applied): with KVM_SET_GUEST_DEBUG in arch_put_regs all migration >> tests fail, without, all of them succeed. >> >> So env->kvm_guest_debug has been zeroed by cpu_x86_init, which means >> the writeback via KVM_SET_GUEST_DEBUG does almost nothing. It does >> get_rflags and set_rflags in the kernel. > > Hmm, it also copies debug regs around... BTW, where do we save/restore > dr0..7 between kernel and user space? > > But that should not be a problem, both shadow as well as effective regs > should be properly initialized, specifically for a newly created VCPU.
Could you retry after pushing SET_GUEST_DEBUG at the end of kvm_arch_put_registers? Maybe it is no good idea to run get/set_rflags without having the sregs properly initialized. Jan -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
