Re: [PATCH v22 8/8] x86/vdso: Add ENDBR64 to __vdso_sgx_enter_enclave
- From
- Jarkko Sakkinen <jarkko@kernel.org>
- Date
- 2021-03-12 16:57:44
- Also in
- linux-api, linux-arch, linux-mm, lkml
- Reply to
- Peter Zijlstra, 2021-03-11
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:quoted
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