Messages in this thread | | | Date | Fri, 12 Mar 2021 18:56:45 +0200 | From | Jarkko Sakkinen <> | Subject | Re: [PATCH v22 8/8] x86/vdso: Add ENDBR64 to __vdso_sgx_enter_enclave |
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On Thu, Mar 11, 2021 at 09:42:05AM +0100, Peter Zijlstra wrote: > On Thu, Mar 11, 2021 at 05:36:06AM +0200, Jarkko Sakkinen wrote: > > Does it do any harm to put it there unconditionally? > > Blows up your text footprint and I$ pressure. These instructions are 4 > bytes each. > > Aside from that, they're a NOP, so only consume front-end resources > (hopefully) on older CPUs and when IBT is disabled.
OK, understood, thanks for the explanation.
/Jarkko
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