[tip: x86/fpu] Documentation/x86: Explain the purpose for dynamic features

[tip-bot2 for Chang S. Bae]

The following commit has been merged into the x86/fpu branch of tip:

Commit-ID:     ad9c29f3c29197aa25d26a5f258a98e4cb901996
Gitweb:        https://git.kernel.org/tip/ad9c29f3c29197aa25d26a5f258a98e4cb901996
Author:        Chang S. Bae <chang.seok.bae@xxxxxxxxx>
AuthorDate:    Fri, 20 Jan 2023 16:18:57 -08:00
Committer:     Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
CommitterDate: Wed, 22 Mar 2023 13:02:18 -07:00

Documentation/x86: Explain the purpose for dynamic features

This summary will help to guide the proper use of the enabling model.

Signed-off-by: Chang S. Bae <chang.seok.bae@xxxxxxxxx>
Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Reviewed-by: Tony Luck <tony.luck@xxxxxxxxx>
Link: https://lore.kernel.org/all/20230121001900.14900-2-chang.seok.bae%40intel.com
---
 Documentation/x86/xstate.rst | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Documentation/x86/xstate.rst b/Documentation/x86/xstate.rst
index 5cec7fb..e954e79 100644
--- a/Documentation/x86/xstate.rst
+++ b/Documentation/x86/xstate.rst
@@ -11,6 +11,22 @@ are enabled by XCR0 as well, but the first use of related instruction is
 trapped by the kernel because by default the required large XSTATE buffers
 are not allocated automatically.
 
+The purpose for dynamic features
+--------------------------------
+
+Legacy userspace libraries often have hard-coded, static sizes for
+alternate signal stacks, often using MINSIGSTKSZ which is typically 2KB.
+That stack must be able to store at *least* the signal frame that the
+kernel sets up before jumping into the signal handler. That signal frame
+must include an XSAVE buffer defined by the CPU.
+
+However, that means that the size of signal stacks is dynamic, not static,
+because different CPUs have differently-sized XSAVE buffers. A compiled-in
+size of 2KB with existing applications is too small for new CPU features
+like AMX. Instead of universally requiring larger stack, with the dynamic
+enabling, the kernel can enforce userspace applications to have
+properly-sized altstacks.
+
 Using dynamically enabled XSTATE features in user space applications
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