| Date | Sun, 11 Feb 2018 12:46:43 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH v2 6/6] x86/speculation: Use IBRS if available before calling into firmware |
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* David Woodhouse <dwmw@amazon.co.uk> wrote:
> Retpoline means the kernel is safe because it has no indirect branches. > But firmware isn't, so use IBRS for firmware calls if it's available.
Ok, this approach looks good to me in principle, but:
> --- a/arch/x86/include/asm/apm.h > +++ b/arch/x86/include/asm/apm.h > @@ -7,6 +7,8 @@ > #ifndef _ASM_X86_MACH_DEFAULT_APM_H > #define _ASM_X86_MACH_DEFAULT_APM_H > > +#include <asm/spec_ctrl.h>
I cannot see this header file upstream anywhere, nor in any other patch in my mbox - is there some dependency that has to be applied first?
Thanks,
Ingo
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