as we are about to change the way KVM deals with SVE, provide
KVM with its own save/restore SVE primitives.
No functional change intended.
Acked-by: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
arch/arm64/include/asm/fpsimdmacros.h | 2 ++
arch/arm64/include/asm/kvm_hyp.h | 2 ++
arch/arm64/kvm/hyp/fpsimd.S | 10 ++++++++++
arch/arm64/kvm/hyp/include/hyp/switch.h | 10 +++++-----
4 files changed, 19 insertions(+), 5 deletions(-)
diff --git a/arch/arm64/include/asm/fpsimdmacros.h b/arch/arm64/include/asm/fpsimdmacros.h
index af43367534c7..e9b72d35b867 100644
--- a/arch/arm64/include/asm/fpsimdmacros.h
+++ b/arch/arm64/include/asm/fpsimdmacros.h
@@ -6,6 +6,8 @@
* Author: Catalin Marinas <catalin.marinas@xxxxxxx>
*/
+#include <asm/assembler.h>
+
.macro fpsimd_save state, tmpnr
stp q0, q1, [\state, #16 * 0]
stp q2, q3, [\state, #16 * 2]
diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h
index c0450828378b..e8b0f7fcd86b 100644
--- a/arch/arm64/include/asm/kvm_hyp.h
+++ b/arch/arm64/include/asm/kvm_hyp.h
@@ -85,6 +85,8 @@ void __debug_switch_to_host(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, unsigned int vqminus1);
#ifndef __KVM_NVHE_HYPERVISOR__
void activate_traps_vhe_load(struct kvm_vcpu *vcpu);
diff --git a/arch/arm64/kvm/hyp/fpsimd.S b/arch/arm64/kvm/hyp/fpsimd.S
index 01f114aa47b0..95b22e10996c 100644
--- a/arch/arm64/kvm/hyp/fpsimd.S
+++ b/arch/arm64/kvm/hyp/fpsimd.S
@@ -19,3 +19,13 @@ SYM_FUNC_START(__fpsimd_restore_state)
fpsimd_restore x0, 1
ret
SYM_FUNC_END(__fpsimd_restore_state)
+
+SYM_FUNC_START(__sve_restore_state)
+ sve_load 0, x1, x2, 3, x4
+ ret
+SYM_FUNC_END(__sve_restore_state)
+
+SYM_FUNC_START(__sve_save_state)
+ sve_save 0, x1, 2
+ ret
+SYM_FUNC_END(__sve_save_state)
diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h
index 54f4860cd87c..807bc4734828 100644
--- a/arch/arm64/kvm/hyp/include/hyp/switch.h
+++ b/arch/arm64/kvm/hyp/include/hyp/switch.h
@@ -256,8 +256,8 @@ static inline bool __hyp_handle_fpsimd(struct kvm_vcpu *vcpu)
vcpu->arch.host_fpsimd_state,
struct thread_struct, uw.fpsimd_state);
- sve_save_state(sve_pffr(thread),
- &vcpu->arch.host_fpsimd_state->fpsr);
+ __sve_save_state(sve_pffr(thread),
+ &vcpu->arch.host_fpsimd_state->fpsr);
} else {
__fpsimd_save_state(vcpu->arch.host_fpsimd_state);
}
@@ -266,9 +266,9 @@ static inline bool __hyp_handle_fpsimd(struct kvm_vcpu *vcpu)
}
if (sve_guest) {
- sve_load_state(vcpu_sve_pffr(vcpu),
- &vcpu->arch.ctxt.fp_regs.fpsr,
- sve_vq_from_vl(vcpu->arch.sve_max_vl) - 1);
+ __sve_restore_state(vcpu_sve_pffr(vcpu),
+ &vcpu->arch.ctxt.fp_regs.fpsr,
+ sve_vq_from_vl(vcpu->arch.sve_max_vl) - 1);
write_sysreg_s(__vcpu_sys_reg(vcpu, ZCR_EL1), SYS_ZCR_EL12);
} else {
__fpsimd_restore_state(&vcpu->arch.ctxt.fp_regs);
--
2.29.2
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