| Date | Thu, 4 Jan 2018 18:48:45 +0000 | From | Alan Cox <> | Subject | Re: [PATCH 5/7] x86: Use IBRS for firmware update path |
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On Thu, 4 Jan 2018 09:56:46 -0800 Tim Chen <tim.c.chen@linux.intel.com> wrote:
> From: David Woodhouse <dwmw@amazon.co.uk> > > We are impervious to the indirect branch prediction attack with retpoline > but firmware won't be, so we still need to set IBRS to protect > firmware code execution when calling into firmware at runtime.
If you are going to care about APM then you also need to care about BIOS32 interfaces (arch/x86/pc/pcibios.c) and PNPBIOS (drivers/pnp/pnpbios/bioscalls.c)
Alan
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