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[RFC,v2,06/22] KVM: arm64: Make FFR restore optional in __sve_restore_state()

Message ID 20231222-kvm-arm64-sme-v2-6-da226cb180bb@kernel.org (mailing list archive)
State New
Headers show
Series KVM: arm64: Implement support for SME in non-protected guests | expand

Commit Message

Mark Brown Dec. 22, 2023, 4:21 p.m. UTC
Since FFR is an optional feature of SME's streaming SVE mode in order to
support load of guest register state when SME is implemented we need to
provide callers of __sve_restore_state() access to the flag that the
sve_load macro has indicating if FFR should be loaded. Do so, simply a
matter of removing the hard coding in the asm.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
 arch/arm64/include/asm/kvm_hyp.h        | 2 +-
 arch/arm64/kvm/hyp/fpsimd.S             | 1 -
 arch/arm64/kvm/hyp/include/hyp/switch.h | 2 +-
 3 files changed, 2 insertions(+), 3 deletions(-)
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Patch

diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h
index 145ce73fc16c..7ac38ed90062 100644
--- a/arch/arm64/include/asm/kvm_hyp.h
+++ b/arch/arm64/include/asm/kvm_hyp.h
@@ -111,7 +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_restore_state(void *sve_pffr, u32 *fpsr);
+void __sve_restore_state(void *sve_pffr, u32 *fpsr, bool restore_ffr);
 
 u64 __guest_enter(struct kvm_vcpu *vcpu);
 
diff --git a/arch/arm64/kvm/hyp/fpsimd.S b/arch/arm64/kvm/hyp/fpsimd.S
index 61e6f3ba7b7d..8940954b5420 100644
--- a/arch/arm64/kvm/hyp/fpsimd.S
+++ b/arch/arm64/kvm/hyp/fpsimd.S
@@ -21,7 +21,6 @@  SYM_FUNC_START(__fpsimd_restore_state)
 SYM_FUNC_END(__fpsimd_restore_state)
 
 SYM_FUNC_START(__sve_restore_state)
-	mov	x2, #1
 	sve_load 0, x1, x2, 3
 	ret
 SYM_FUNC_END(__sve_restore_state)
diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h
index f99d8af0b9af..9601212bd3ce 100644
--- a/arch/arm64/kvm/hyp/include/hyp/switch.h
+++ b/arch/arm64/kvm/hyp/include/hyp/switch.h
@@ -286,7 +286,7 @@  static inline void __hyp_sve_restore_guest(struct kvm_vcpu *vcpu)
 {
 	sve_cond_update_zcr_vq(vcpu_sve_max_vq(vcpu) - 1, SYS_ZCR_EL2);
 	__sve_restore_state(vcpu_sve_pffr(vcpu),
-			    &vcpu->arch.ctxt.fp_regs.fpsr);
+			    &vcpu->arch.ctxt.fp_regs.fpsr, true);
 	write_sysreg_el1(__vcpu_sys_reg(vcpu, ZCR_EL1), SYS_ZCR);
 }