> On 08-Mar-2023, at 12:06 PM, Paul Mackerras <paulus@xxxxxxxxxx> wrote: > > Now that we can read prefixed instructions from a HV KVM guest and > emulate prefixed load/store instructions to emulated MMIO locations, > we can add HFSCR_PREFIXED into the set of bits that are set in the > HFSCR for a HV KVM guest on POWER10, allowing the guest to use > prefixed instructions. > > PR KVM has not yet been extended to handle prefixed instructions in > all situations where we might need to emulate them, so prevent the > guest from enabling prefixed instructions in the FSCR for now. > > Reviewed-by: Nicholas Piggin <npiggin@xxxxxxxxx> > Tested-by: Nicholas Piggin <npiggin@xxxxxxxxx> > Signed-off-by: Paul Mackerras <paulus@xxxxxxxxxx> > --- Tested on a Power10 system. Prefixed instructions work correctly. Tested-by: Sachin Sant <sachinp@xxxxxxxxxxxxx> > arch/powerpc/include/asm/reg.h | 1 + > arch/powerpc/kvm/book3s_hv.c | 9 +++++++-- > arch/powerpc/kvm/book3s_pr.c | 2 ++ > arch/powerpc/kvm/book3s_rmhandlers.S | 1 + > 4 files changed, 11 insertions(+), 2 deletions(-) >
