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KVM: arm64: Reintroduce __sve_save_state

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Now that the hypervisor is handling the host sve state in
protected mode, it needs to be able to save it.

This reverts commit e66425fc9ba3 ("KVM: arm64: Remove unused
__sve_save_state").

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Fuad Tabba <tabba@google.com>
Link: https://lore.kernel.org/r/20240603122852.3923848-2-tabba@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Fuad Tabba 2024-06-03 13:28:43 +01:00 committed by Marc Zyngier
parent 47eb2d68d1
commit 87bb39ed40
2 changed files with 7 additions and 0 deletions
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1
arch/arm64/include/asm/kvm_hyp.h
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@ -111,6 +111,7 @@ void __debug_restore_host_buffers_nvhe(struct kvm_vcpu *vcpu);
void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
void __sve_save_state(void *sve_pffr, u32 *fpsr);
void __sve_restore_state(void *sve_pffr, u32 *fpsr);
u64 __guest_enter(struct kvm_vcpu *vcpu);

6
arch/arm64/kvm/hyp/fpsimd.S
View File

@ -25,3 +25,9 @@ SYM_FUNC_START(__sve_restore_state)
sve_load 0, x1, x2, 3
ret
SYM_FUNC_END(__sve_restore_state)
SYM_FUNC_START(__sve_save_state)
mov x2, #1
sve_save 0, x1, x2, 3
ret
SYM_FUNC_END(__sve_save_state)