Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752705AbdCFC3R (ORCPT ); Sun, 5 Mar 2017 21:29:17 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:51344 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752545AbdCFC3P (ORCPT ); Sun, 5 Mar 2017 21:29:15 -0500 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org B5EA9602B5 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=shankerd@codeaurora.org From: Shanker Donthineni To: Marc Zyngier , Christoffer Dall Cc: linux-kernel , linux-arm-kernel , kvmarm , kvm , Will Deacon , Catalin Marinas , Vikram Sethi , Shanker Donthineni Subject: [PATCH] arm64: kvm: Use has_vhe() instead of hyp_alternate_select() Date: Sun, 5 Mar 2017 20:28:43 -0600 Message-Id: <1488767323-1958-1-git-send-email-shankerd@codeaurora.org> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7518 Lines: 225 Now all the cpu_hwcaps features have their own static keys. We don't need a separate function hyp_alternate_select() to patch the vhe/nvhe code. We can achieve the same functionality by using has_vhe(). It improves the code readability, uses the jump label instructions, and also compiler generates the better code with a fewer instructions. Change-Id: Ia8084189833f2081ff13c392deb5070c46a64038 Signed-off-by: Shanker Donthineni --- arch/arm64/kvm/hyp/debug-sr.c | 12 ++++++---- arch/arm64/kvm/hyp/switch.c | 50 +++++++++++++++++++----------------------- arch/arm64/kvm/hyp/sysreg-sr.c | 23 +++++++++---------- 3 files changed, 43 insertions(+), 42 deletions(-) diff --git a/arch/arm64/kvm/hyp/debug-sr.c b/arch/arm64/kvm/hyp/debug-sr.c index f5154ed..e5642c2 100644 --- a/arch/arm64/kvm/hyp/debug-sr.c +++ b/arch/arm64/kvm/hyp/debug-sr.c @@ -109,9 +109,13 @@ static void __hyp_text __debug_save_spe_nvhe(u64 *pmscr_el1) dsb(nsh); } -static hyp_alternate_select(__debug_save_spe, - __debug_save_spe_nvhe, __debug_save_spe_vhe, - ARM64_HAS_VIRT_HOST_EXTN); +static void __hyp_text __debug_save_spe(u64 *pmscr_el1) +{ + if (has_vhe()) + __debug_save_spe_vhe(pmscr_el1); + else + __debug_save_spe_nvhe(pmscr_el1); +} static void __hyp_text __debug_restore_spe(u64 pmscr_el1) { @@ -180,7 +184,7 @@ void __hyp_text __debug_cond_save_host_state(struct kvm_vcpu *vcpu) __debug_save_state(vcpu, &vcpu->arch.host_debug_state.regs, kern_hyp_va(vcpu->arch.host_cpu_context)); - __debug_save_spe()(&vcpu->arch.host_debug_state.pmscr_el1); + __debug_save_spe(&vcpu->arch.host_debug_state.pmscr_el1); } void __hyp_text __debug_cond_restore_host_state(struct kvm_vcpu *vcpu) diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c index aede165..c5c77b8 100644 --- a/arch/arm64/kvm/hyp/switch.c +++ b/arch/arm64/kvm/hyp/switch.c @@ -33,13 +33,9 @@ static bool __hyp_text __fpsimd_enabled_vhe(void) return !!(read_sysreg(cpacr_el1) & CPACR_EL1_FPEN); } -static hyp_alternate_select(__fpsimd_is_enabled, - __fpsimd_enabled_nvhe, __fpsimd_enabled_vhe, - ARM64_HAS_VIRT_HOST_EXTN); - bool __hyp_text __fpsimd_enabled(void) { - return __fpsimd_is_enabled()(); + return has_vhe() ? __fpsimd_enabled_vhe() : __fpsimd_enabled_nvhe(); } static void __hyp_text __activate_traps_vhe(void) @@ -63,9 +59,10 @@ static void __hyp_text __activate_traps_nvhe(void) write_sysreg(val, cptr_el2); } -static hyp_alternate_select(__activate_traps_arch, - __activate_traps_nvhe, __activate_traps_vhe, - ARM64_HAS_VIRT_HOST_EXTN); +static void __hyp_text __activate_traps_arch(void) +{ + has_vhe() ? __activate_traps_vhe() : __activate_traps_nvhe(); +} static void __hyp_text __activate_traps(struct kvm_vcpu *vcpu) { @@ -97,7 +94,7 @@ static void __hyp_text __activate_traps(struct kvm_vcpu *vcpu) write_sysreg(0, pmselr_el0); write_sysreg(ARMV8_PMU_USERENR_MASK, pmuserenr_el0); write_sysreg(vcpu->arch.mdcr_el2, mdcr_el2); - __activate_traps_arch()(); + __activate_traps_arch(); } static void __hyp_text __deactivate_traps_vhe(void) @@ -127,9 +124,10 @@ static void __hyp_text __deactivate_traps_nvhe(void) write_sysreg(CPTR_EL2_DEFAULT, cptr_el2); } -static hyp_alternate_select(__deactivate_traps_arch, - __deactivate_traps_nvhe, __deactivate_traps_vhe, - ARM64_HAS_VIRT_HOST_EXTN); +static void __hyp_text __deactivate_traps_arch(void) +{ + has_vhe() ? __deactivate_traps_vhe() : __deactivate_traps_nvhe(); +} static void __hyp_text __deactivate_traps(struct kvm_vcpu *vcpu) { @@ -142,7 +140,7 @@ static void __hyp_text __deactivate_traps(struct kvm_vcpu *vcpu) if (vcpu->arch.hcr_el2 & HCR_VSE) vcpu->arch.hcr_el2 = read_sysreg(hcr_el2); - __deactivate_traps_arch()(); + __deactivate_traps_arch(); write_sysreg(0, hstr_el2); write_sysreg(0, pmuserenr_el0); } @@ -183,20 +181,14 @@ static void __hyp_text __vgic_restore_state(struct kvm_vcpu *vcpu) __vgic_v2_restore_state(vcpu); } -static bool __hyp_text __true_value(void) +static bool __check_arm_834220(void) { - return true; -} + if (cpus_have_const_cap(ARM64_WORKAROUND_834220)) + return true; -static bool __hyp_text __false_value(void) -{ return false; } -static hyp_alternate_select(__check_arm_834220, - __false_value, __true_value, - ARM64_WORKAROUND_834220); - static bool __hyp_text __translate_far_to_hpfar(u64 far, u64 *hpfar) { u64 par, tmp; @@ -251,7 +243,7 @@ static bool __hyp_text __populate_fault_info(struct kvm_vcpu *vcpu) * resolve the IPA using the AT instruction. */ if (!(esr & ESR_ELx_S1PTW) && - (__check_arm_834220()() || (esr & ESR_ELx_FSC_TYPE) == FSC_PERM)) { + (__check_arm_834220() || (esr & ESR_ELx_FSC_TYPE) == FSC_PERM)) { if (!__translate_far_to_hpfar(far, &hpfar)) return false; } else { @@ -406,9 +398,13 @@ static void __hyp_text __hyp_call_panic_vhe(u64 spsr, u64 elr, u64 par) (void *)read_sysreg(tpidr_el2)); } -static hyp_alternate_select(__hyp_call_panic, - __hyp_call_panic_nvhe, __hyp_call_panic_vhe, - ARM64_HAS_VIRT_HOST_EXTN); +static void __hyp_text __hyp_call_panic(u64 spsr, u64 elr, u64 par) +{ + if (has_vhe()) + __hyp_call_panic_vhe(spsr, elr, par); + else + __hyp_call_panic_nvhe(spsr, elr, par); +} void __hyp_text __noreturn __hyp_panic(void) { @@ -428,7 +424,7 @@ void __hyp_text __noreturn __hyp_panic(void) } /* Call panic for real */ - __hyp_call_panic()(spsr, elr, par); + __hyp_call_panic(spsr, elr, par); unreachable(); } diff --git a/arch/arm64/kvm/hyp/sysreg-sr.c b/arch/arm64/kvm/hyp/sysreg-sr.c index 9341376..2a6cb27 100644 --- a/arch/arm64/kvm/hyp/sysreg-sr.c +++ b/arch/arm64/kvm/hyp/sysreg-sr.c @@ -21,9 +21,6 @@ #include #include -/* Yes, this does nothing, on purpose */ -static void __hyp_text __sysreg_do_nothing(struct kvm_cpu_context *ctxt) { } - /* * Non-VHE: Both host and guest must save everything. * @@ -68,13 +65,15 @@ static void __hyp_text __sysreg_save_state(struct kvm_cpu_context *ctxt) ctxt->gp_regs.spsr[KVM_SPSR_EL1]= read_sysreg_el1(spsr); } -static hyp_alternate_select(__sysreg_call_save_host_state, - __sysreg_save_state, __sysreg_do_nothing, - ARM64_HAS_VIRT_HOST_EXTN); +static void __hyp_text __sysreg_call_save_host_state(struct kvm_cpu_context *ctxt) +{ + if (!has_vhe()) + __sysreg_save_state(ctxt); +} void __hyp_text __sysreg_save_host_state(struct kvm_cpu_context *ctxt) { - __sysreg_call_save_host_state()(ctxt); + __sysreg_call_save_host_state(ctxt); __sysreg_save_common_state(ctxt); } @@ -121,13 +120,15 @@ static void __hyp_text __sysreg_restore_state(struct kvm_cpu_context *ctxt) write_sysreg_el1(ctxt->gp_regs.spsr[KVM_SPSR_EL1],spsr); } -static hyp_alternate_select(__sysreg_call_restore_host_state, - __sysreg_restore_state, __sysreg_do_nothing, - ARM64_HAS_VIRT_HOST_EXTN); +static void __hyp_text __sysreg_call_restore_host_state(struct kvm_cpu_context *ctxt) +{ + if (!has_vhe()) + __sysreg_restore_state(ctxt); +} void __hyp_text __sysreg_restore_host_state(struct kvm_cpu_context *ctxt) { - __sysreg_call_restore_host_state()(ctxt); + __sysreg_call_restore_host_state(ctxt); __sysreg_restore_common_state(ctxt); } -- Qualcomm Datacenter Technologies, Inc. on behalf of the Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.