+KVM/SVM folks in case they know more about how enabling CPU features interacts with virtualization; original patch is at https://lore.kernel.org/all/20241230175550.4046587-12-riel@xxxxxxxxxxx/ On Sat, Jan 4, 2025 at 4:08 AM Rik van Riel <riel@xxxxxxxxxxx> wrote: > On Fri, 2025-01-03 at 18:49 +0100, Jann Horn wrote: > > On Mon, Dec 30, 2024 at 6:53 PM Rik van Riel <riel@xxxxxxxxxxx> > > > only those upper-level entries that lead to the target PTE in > > > the page table hierarchy, leaving unrelated upper-level entries > > > intact. > > > > How does this patch interact with KVM SVM guests? > > In particular, will this patch cause TLB flushes performed by guest > > kernels to behave differently? > > > That is a good question. > > A Linux guest should be fine, since Linux already > flushes the parts of the TLB where page tables are > being freed. > > I don't know whether this could potentially break > some non-Linux guests, though.
