Re: [PATCH 25/35] x86/cet/shstk: Add user-mode shadow stack support
From: "Andy Lutomirski" <luto@kernel.org>
Date: 2022-02-12 00:08:25
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On Fri, Feb 11, 2022, at 3:37 PM, Dave Hansen wrote:
On 1/30/22 13:18, Rick Edgecombe wrote:quoted
Add the user shadow stack MSRs to the xsave helpers, so they can be used to implement the functionality.Do these MSRs ever affect kernel-mode operation? If so, we might need to switch them more aggressively at context-switch time like PKRU. If not, they can continue to be context-switched with the PASID state which does not affect kernel-mode operation.
PASID? PASID is all kinds of weird. I assume you mean switching it with all the normal state.
Either way, it would be nice to have some changelog material to that effect.