[PATCH v3 09/11] KVM: arm64: Do not use sve_cond_update_zcr updating with ZCR_ELx_LEN_MASK
From: Fuad Tabba <hidden>
Date: 2024-05-28 13:01:38
Also in:
kvmarm
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
A conditional update of ZCR with ZCR_ELx_LEN_MASK is unlikely to be beneficial, since at the time nobody implements 2k vectors. Signed-off-by: Fuad Tabba <redacted> --- arch/arm64/kvm/hyp/nvhe/hyp-main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
index 1088b0bd3cc5..b28d7d8cdc30 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c@@ -468,7 +468,7 @@ void handle_trap(struct kvm_cpu_context *host_ctxt) case ESR_ELx_EC_SVE: cpacr_clear_set(0, CPACR_ELx_ZEN); isb(); - sve_cond_update_zcr_vq(ZCR_ELx_LEN_MASK, SYS_ZCR_EL2); + write_sysreg_s(ZCR_ELx_LEN_MASK, SYS_ZCR_EL2); break; case ESR_ELx_EC_IABT_LOW: case ESR_ELx_EC_DABT_LOW:
--
2.45.1.288.g0e0cd299f1-goog
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