On 1/6/2018 3:21 PM, Woodhouse, David wrote:
> On Sat, 2018-01-06 at 21:16 +, Andrew Cooper wrote:
>> On 06/01/18 11:49, David Woodhouse wrote:
>>> diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
>>> index 372ba3f..40e6e54 100644
>>> --- a/arch/x86/kernel/cpu/common.c
On 1/6/2018 3:21 PM, Woodhouse, David wrote:
> On Sat, 2018-01-06 at 21:16 +, Andrew Cooper wrote:
>> On 06/01/18 11:49, David Woodhouse wrote:
>>> diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
>>> index 372ba3f..40e6e54 100644
>>> --- a/arch/x86/kernel/cpu/common.c
On Sat, 2018-01-06 at 21:34 +, Andrew Cooper wrote:
> On 06/01/18 21:23, Thomas Gleixner wrote:
> >
> > On Sat, 6 Jan 2018, Andrew Cooper wrote:
> > >
> > > On 06/01/18 11:49, David Woodhouse wrote:
> > > >
> > > > diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
> >
On Sat, 2018-01-06 at 21:34 +, Andrew Cooper wrote:
> On 06/01/18 21:23, Thomas Gleixner wrote:
> >
> > On Sat, 6 Jan 2018, Andrew Cooper wrote:
> > >
> > > On 06/01/18 11:49, David Woodhouse wrote:
> > > >
> > > > diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
> >
On 06/01/18 21:23, Thomas Gleixner wrote:
> On Sat, 6 Jan 2018, Andrew Cooper wrote:
>> On 06/01/18 11:49, David Woodhouse wrote:
>>> diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
>>> index 372ba3f..40e6e54 100644
>>> --- a/arch/x86/kernel/cpu/common.c
>>> +++
On 06/01/18 21:23, Thomas Gleixner wrote:
> On Sat, 6 Jan 2018, Andrew Cooper wrote:
>> On 06/01/18 11:49, David Woodhouse wrote:
>>> diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
>>> index 372ba3f..40e6e54 100644
>>> --- a/arch/x86/kernel/cpu/common.c
>>> +++
On Sat, 6 Jan 2018, Andrew Cooper wrote:
> On 06/01/18 11:49, David Woodhouse wrote:
> > diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
> > index 372ba3f..40e6e54 100644
> > --- a/arch/x86/kernel/cpu/common.c
> > +++ b/arch/x86/kernel/cpu/common.c
> > @@ -904,6 +904,11 @@
On Sat, 6 Jan 2018, Andrew Cooper wrote:
> On 06/01/18 11:49, David Woodhouse wrote:
> > diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
> > index 372ba3f..40e6e54 100644
> > --- a/arch/x86/kernel/cpu/common.c
> > +++ b/arch/x86/kernel/cpu/common.c
> > @@ -904,6 +904,11 @@
On Sat, 2018-01-06 at 21:16 +, Andrew Cooper wrote:
> On 06/01/18 11:49, David Woodhouse wrote:
> > diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
> > index 372ba3f..40e6e54 100644
> > --- a/arch/x86/kernel/cpu/common.c
> > +++ b/arch/x86/kernel/cpu/common.c
> > @@
On Sat, 2018-01-06 at 21:16 +, Andrew Cooper wrote:
> On 06/01/18 11:49, David Woodhouse wrote:
> > diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
> > index 372ba3f..40e6e54 100644
> > --- a/arch/x86/kernel/cpu/common.c
> > +++ b/arch/x86/kernel/cpu/common.c
> > @@
On 06/01/18 11:49, David Woodhouse wrote:
> diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
> index 372ba3f..40e6e54 100644
> --- a/arch/x86/kernel/cpu/common.c
> +++ b/arch/x86/kernel/cpu/common.c
> @@ -904,6 +904,11 @@ static void __init early_identify_cpu(struct
On 06/01/18 11:49, David Woodhouse wrote:
> diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
> index 372ba3f..40e6e54 100644
> --- a/arch/x86/kernel/cpu/common.c
> +++ b/arch/x86/kernel/cpu/common.c
> @@ -904,6 +904,11 @@ static void __init early_identify_cpu(struct
On Sat, 2018-01-06 at 10:35 -0800, Eric Biggers wrote:
> On Sat, Jan 06, 2018 at 11:49:24AM +, David Woodhouse wrote:
> >
> > +/*
> > + * NOSPEC_JMP and NOSPEC_CALL macros can be used instead of a simple
> > + * indirect jmp/call which may be susceptible to the Spectre variant 2
> > + *
On Sat, 2018-01-06 at 10:35 -0800, Eric Biggers wrote:
> On Sat, Jan 06, 2018 at 11:49:24AM +, David Woodhouse wrote:
> >
> > +/*
> > + * NOSPEC_JMP and NOSPEC_CALL macros can be used instead of a simple
> > + * indirect jmp/call which may be susceptible to the Spectre variant 2
> > + *
On Sat, Jan 06, 2018 at 11:49:24AM +, David Woodhouse wrote:
> +/*
> + * NOSPEC_JMP and NOSPEC_CALL macros can be used instead of a simple
> + * indirect jmp/call which may be susceptible to the Spectre variant 2
> + * attack.
> + */
Can be, or must be?
> +.macro NOSPEC_JMP reg:req
> +#ifdef
On Sat, Jan 06, 2018 at 11:49:24AM +, David Woodhouse wrote:
> +/*
> + * NOSPEC_JMP and NOSPEC_CALL macros can be used instead of a simple
> + * indirect jmp/call which may be susceptible to the Spectre variant 2
> + * attack.
> + */
Can be, or must be?
> +.macro NOSPEC_JMP reg:req
> +#ifdef
On Sat, 2018-01-06 at 11:49 +, David Woodhouse wrote:
>
> +#if defined(CONFIG_X86_64) && defined(RETPOLINE)
> +/*
> + * Since the inline asm uses the %V modifier which is only in newer GCC,
> + * the 64-bit one is dependent on RETPOLINE not CONFIG_RETPOLINE.
> + */
> +# define NOSPEC_CALL
On Sat, 2018-01-06 at 11:49 +, David Woodhouse wrote:
>
> +#if defined(CONFIG_X86_64) && defined(RETPOLINE)
> +/*
> + * Since the inline asm uses the %V modifier which is only in newer GCC,
> + * the 64-bit one is dependent on RETPOLINE not CONFIG_RETPOLINE.
> + */
> +# define NOSPEC_CALL
Enable the use of -mindirect-branch=thunk-extern in newer GCC, and provide
the corresponding thunks. Provide assembler macros for invoking the thunks
in the same way that GCC does, from native and inline assembler.
This adds X86_FEATURE_RETPOLINE and sets it by default on all CPUs. In
some
Enable the use of -mindirect-branch=thunk-extern in newer GCC, and provide
the corresponding thunks. Provide assembler macros for invoking the thunks
in the same way that GCC does, from native and inline assembler.
This adds X86_FEATURE_RETPOLINE and sets it by default on all CPUs. In
some
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