On Tue, Oct 10, 2017 at 07:38:39PM +0100, Dave P Martin wrote: > Until KVM has full SVE support, guests must not be allowed to > execute SVE instructions. > > This patch enables the necessary traps, and also ensures that the > traps are disabled again on exit from the guest so that the host > can still use SVE if it wants to. > > This patch introduces another instance of > __this_cpu_write(fpsimd_last_state, NULL), so this flush operation > is abstracted out as a separate helper fpsimd_flush_cpu_state(). > Other instances are ported appropriately. > > As a side effect of this refactoring, a this_cpu_write() in > fpsimd_cpu_pm_notifier() is changed to __this_cpu_write(). This > should be fine, since cpu_pm_enter() is supposed to be called only > with interrupts disabled. > > Signed-off-by: Dave Martin <Dave.Martin@xxxxxxx> > Reviewed-by: Alex Bennée <alex.bennee@xxxxxxxxxx> > Cc: Marc Zyngier <marc.zyngier@xxxxxxx> > Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
