On Tue, Jun 23, 2020 at 01:14:43PM +0200, Peter Zijlstra wrote: > On Tue, Jun 23, 2020 at 01:11:07PM +0200, Joerg Roedel wrote: > > The v3 patchset implements an unconditional shift of the #VC IST entry > > in the NMI handler, before it can trigger a #VC exception. > > Going by that other thread -- where you said that any memory access can > trigger a #VC, there just isn't such a guarantee. As I wrote in the other mail, this can only happen when SNP gets enabled (which is follow-on work to this) and is handled by a stack recursion check in the #VC handler. The reason I mentioned the #VC-anywhere case is to make it more clear why #VC needs an IST handler. Regards, Joerg
