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| author | Jakub Kicinski <kuba@kernel.org> | 2021-11-19 00:13:16 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-11-19 00:13:16 +0300 |
| commit | 50fc24944a2a0ef5aab571dcac17f6c5f2613f56 (patch) | |
| tree | 32477b48cc10073e948eb7b85877dc5a0746749d /Documentation/x86/xstate.rst | |
| parent | bb8cecf8ba127abca8ccd102207a59c55fdae515 (diff) | |
| parent | 8d0112ac6fd001f95aabb084ec2ccaa3637bc344 (diff) | |
| download | linux-50fc24944a2a0ef5aab571dcac17f6c5f2613f56.tar.xz | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'Documentation/x86/xstate.rst')
| -rw-r--r-- | Documentation/x86/xstate.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/x86/xstate.rst b/Documentation/x86/xstate.rst index 65de3f054ba5..5cec7fb558d6 100644 --- a/Documentation/x86/xstate.rst +++ b/Documentation/x86/xstate.rst @@ -63,3 +63,12 @@ kernel sends SIGILL to the application. If the process has permission then the handler allocates a larger xstate buffer for the task so the large state can be context switched. In the unlikely cases that the allocation fails, the kernel sends SIGSEGV. + +Dynamic features in signal frames +--------------------------------- + +Dynamcally enabled features are not written to the signal frame upon signal +entry if the feature is in its initial configuration. This differs from +non-dynamic features which are always written regardless of their +configuration. Signal handlers can examine the XSAVE buffer's XSTATE_BV +field to determine if a features was written. |