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Revert "FROMGIT: arm64/fpsimd: Document the use of TIF_FOREIGN_FPSTATE by KVM"

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This reverts commit 2e202f3849.

Bug: 233587962
Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: Iab9a6f03411550b9cb35074f721262c31ea6b70e
This commit is contained in:
Will Deacon
2022-07-07 15:52:12 +01:00
parent cd0a5c094f
commit c9d22fd9ef
1 changed files with 1 additions and 5 deletions
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6
arch/arm64/kernel/fpsimd.c
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@@ -78,11 +78,7 @@
* indicate whether or not the userland FPSIMD state of the current task is
* present in the registers. The flag is set unless the FPSIMD registers of this
* CPU currently contain the most recent userland FPSIMD state of the current
* task. If the task is behaving as a VMM, then this is will be managed by
* KVM which will clear it to indicate that the vcpu FPSIMD state is currently
* loaded on the CPU, allowing the state to be saved if a FPSIMD-aware
* softirq kicks in. Upon vcpu_put(), KVM will save the vcpu FP state and
* flag the register state as invalid.
* task.
*
* In order to allow softirq handlers to use FPSIMD, kernel_neon_begin() may
* save the task's FPSIMD context back to task_struct from softirq context.