>>> On 21.02.19 at 09:16, <[email protected]> wrote: > --- /dev/null > +++ b/xen/include/asm-x86/nospec.h > @@ -0,0 +1,38 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved. */ > + > +#ifndef _ASM_X86_NOSPEC_H > +#define _ASM_X86_NOSPEC_H > + > +#include <asm/alternative.h> > + > +/* Allow to insert a read memory barrier into conditionals */ > +static always_inline bool barrier_nospec_true(void) > +{ > +#ifdef CONFIG_HVM > + alternative("", "lfence", X86_FEATURE_SC_L1TF_VULN); > +#endif > + return true; > +} > + > +/* Allow to protect evaluation of conditionasl with respect to speculation */ > +#ifdef CONFIG_HVM > +#define evaluate_nospec(condition) \ > + ((condition) ? barrier_nospec_true() : !barrier_nospec_true()) > +#else > +#define evaluate_nospec(condition) (condition) > +#endif > + > +/* Allow to block speculative execution in generic code */ > +#define block_speculation() ((void)barrier_nospec_true())
Seeing Julien's request for switching to inline functions on the Arm side, is there anything preventing these two to become inline functions too? Jan _______________________________________________ Xen-devel mailing list [email protected] https://lists.xenproject.org/mailman/listinfo/xen-devel
