9 Sep
2020
9 Sep
'20
8:38 a.m.
On Wed, 9 Sep 2020 at 16:23, Vitaly Kuznetsov vkuznets@redhat.com wrote:
Wanpeng Li kernellwp@gmail.com writes:
From: Wanpeng Li wanpengli@tencent.com
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