[release/5.0] Backport AVX context fix #66120 #66356
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* Use CopyContext to restore saved context on X86 * PR feedback * more PR feedback
…net#65825) * Do not copy XState other than AVX * #if defined(TARGET_X86) || defined(TARGET_AMD64) * mask XState unconditionally * Ensure XSTATE_MASK_AVX is set before calling EEGetThreadContext * redundant supportsAVX, more clear comment * PR feedback
* null-check the redirect context before using. * tweak the comment * do not allocate context if InitializeContext has unexpected results.
…net#65878) * RestoreContextSimulated * probe for RtlRestoreContext * ntdll.dll * restore self-trap sequence * PR feedback * Clarify CopyContext in RedirectedHandledJITCaseExceptionFilter * simpler indentation. * restore last error on the legacy path. * Update src/coreclr/vm/threads.h Co-authored-by: Dan Moseley <danmose@microsoft.com>
jkotas
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Mar 8, 2022
agocke
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@agocke this change did not have the |
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This was approved for backport in the original schedule |
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Test failures look like #66406. I think we should merge that one ASAP and then this |
VSadov
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Backport of #66120
Port of a fix for #65292 and issues found along the way related to AVX registers and EE suspension.
Customer Impact
It is relatively easy to end up running AVX-accelerated code nowdays. Copying or comparing arrays or spans, using buffered IO are just some examples.
Issues with storing/restoring AVX context during EE suspension could result in:
Testing
Regular test passes.
Risk
Medium.
The code involved is fairly old. We keep discovering assumptions that may no longer hold. We have seen cases where fixing one bug exposes another. To our knowledge these fixes are robust, but this is a delicate area.