s390/kvm: convert to regular kernel fpu user

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KVM modifies the kernel fpu's regs pointer to its own area to implement its
custom version of preemtible kernel fpu context. With general support for
preemptible kernel fpu context there is no need for the extra complexity in
KVM code anymore.

Therefore convert KVM to a regular kernel fpu user. In particular this
means that all TIF_FPU checks can be removed, since the fpu register
context will never be changed by other kernel fpu users, and also the fpu
register context will be restored if a thread is preempted.

Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

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This commit is contained in:

Heiko Carstens 2024-02-03 11:45:13 +01:00

parent 4eed43de9b

commit ed3a0a011a

5 changed files with 22 additions and 26 deletions

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1

arch/s390/include/asm/kvm_host.h

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2

arch/s390/kernel/entry.S

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8

arch/s390/kvm/interrupt.c

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34

arch/s390/kvm/kvm-s390.c

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3

arch/s390/kvm/vsie.c

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