Messages in this thread | | | Date | Tue, 31 May 2022 11:04:17 -0700 | From | Kees Cook <> | Subject | Re: [PATCH v2 5/8] KVM: x86: Reduce the number of emulator GPRs to '8' for 32-bit KVM |
| |
On Thu, May 26, 2022 at 09:08:14PM +0000, Sean Christopherson wrote: > Reduce the number of GPRs emulated by 32-bit KVM from 16 to 8. KVM does > not support emulating 64-bit mode on 32-bit host kernels, and so should > never generate accesses to R8-15. > > Opportunistically use NR_EMULATOR_GPRS in rsm_load_state_{32,64}() now > that it is precise and accurate for both flavors. > > Wrap the definition with full #ifdef ugliness; sadly, IS_ENABLED() > doesn't guarantee a compile-time constant as far as BUILD_BUG_ON() is > concerned. > > Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
-- Kees Cook
| |