Messages in this thread | | | Subject | Re: [PATCH] x86/retpoline: Fill return stack buffer on vmexit | From | Tom Lendacky <> | Date | Wed, 10 Jan 2018 18:14:04 -0600 |
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On 1/10/2018 5:47 PM, David Woodhouse wrote: > On Wed, 2018-01-10 at 22:51 +0000, David Woodhouse wrote: >> In accordance with the Intel and AMD documentation, we need to overwrite >> all entries in the RSB on exiting a guest, to prevent malicious branch >> target predictions from affecting the host kernel. This is needed both >> for retpoline and for IBRS. >> >> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> >> --- >> Untested in this form although it's a variant on what we've had already. >> I have an army of machines willing to do my bidding but nested virt >> is non-trivial and I figure I might as well post it as someone else >> can probably test it in less than the time it takes me to work out how. > > Now smoke tested with Intel VT-x, but not yet on AMD. Tom, would you be > able to do that?
Yes, I'll try to get to it as soon as I can, but it might be tomorrow (morning).
Thanks, Tom
> > >> This implements the most pressing of the RSB stuffing documented >> by dhansen (based our discussions) in https://goo.gl/pXbvBE
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