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Reapply "arm64: fpsimd: Implement lazy restore for kernel mode FPSIMD"

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BugLink: https://bugs.launchpad.net/bugs/2071621

commit f481bb32d60e45fb3d19ea68ce79c5629f3fc3a0 upstream.

This reverts commit b8995a18417088bb53f87c49d200ec72a9dd4ec1.

Ard managed to reproduce the dm-crypt corruption problem and got to the
bottom of it, so re-apply the problematic patch in preparation for
fixing things properly.

Cc: stable@vger.kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Will Deacon
2024-05-22 11:53:05 +01:00
committed by Stefan Bader
parent 47648fcf5c
commit c708fbbead
2 changed files with 19 additions and 0 deletions
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arch/arm64/include/asm/processor.h
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@@ -169,6 +169,7 @@ struct thread_struct {
struct debug_info debug; /* debugging */
struct user_fpsimd_state kernel_fpsimd_state;
unsigned int kernel_fpsimd_cpu;
#ifdef CONFIG_ARM64_PTR_AUTH
struct ptrauth_keys_user keys_user;
#ifdef CONFIG_ARM64_PTR_AUTH_KERNEL