On Wed, 9 Sep 2020 at 16:23, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> wrote: > > Wanpeng Li <kernellwp@xxxxxxxxx> writes: > > > From: Wanpeng Li <wanpengli@xxxxxxxxxxx> > > > > Analysis from Sean: > > > > | svm->next_rip is reset in svm_vcpu_run() only after calling > > | svm_exit_handlers_fastpath(), which will cause SVM's > > | skip_emulated_instruction() to write a stale RIP. > > > > This should only happen when svm->vmcb->control.next_rip is not set by > hardware as skip_emulated_instruction() itself sets 'svm->next_rip' > otherwise, right? The bug is reported here https://bugzilla.kernel.org/show_bug.cgi?id=209155 , the old machine which the reporter uses doesn't have NRIP save on #VMEXIT support. :) Wanpeng
