On Thu, Feb 09, 2023 at 04:54:27AM +0800, Ying-Chun Liu (PaulLiu) wrote: > From: Marc Zyngier <[email protected]> > > Exposing set/way cache maintenance to a virtual machine is unsafe, not > least because the instructions are not permission-checked but also > because they are not broadcast between CPUs. Consequently, KVM traps and > emulates such maintenance in the host kernel using by-VA operations and > looping over the stage-2 page-tables. However, when running under > protected KVM, these instructions are not able to be emulated and will > instead result in an exception being delivered to the guest. > > Introduce CONFIG_CMO_BY_VA_ONLY so that virtual platforms can select > this option and perform by-VA cache maintenance instead of using the > set/way instructions. > > Signed-off-by: Marc Zyngier <[email protected]> > Signed-off-by: Will Deacon <[email protected]> > Signed-off-by: Pierre-Clément Tosi <[email protected]> > [ Paul: pick from the Android tree. Fixup Pierre's commit. And fix some > checkpatch warnings. Rebased to upstream. ] > Signed-off-by: Ying-Chun Liu (PaulLiu) <[email protected]> > Cc: Tom Rini <[email protected]> > Link: > https://android.googlesource.com/platform/external/u-boot/+/db5507f47f4f57f766d52f753ff2cc761afc213b > Link: > https://android.googlesource.com/platform/external/u-boot/+/2baf54e743380a1e4a6bc2dbdde020a2e783ff67
Applied to u-boot/next, thanks! -- Tom
signature.asc
Description: PGP signature
