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From:   David Brazdil <dbrazdil@google.com>
To:     Marc Zyngier <maz@kernel.org>, Will Deacon <will@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        James Morse <james.morse@arm.com>,
        Julien Thierry <julien.thierry.kdev@gmail.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>
Cc:     kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, android-kvm@google.com,
        kernel-team@android.com, David Brazdil <dbrazdil@google.com>
Subject: [PATCH v3 11/15] arm64: kvm: Split hyp/timer-sr.c to VHE/nVHE
Date:   Thu, 18 Jun 2020 13:25:33 +0100
Message-Id: <20200618122537.9625-12-dbrazdil@google.com>
In-Reply-To: <20200618122537.9625-1-dbrazdil@google.com>
References: <20200618122537.9625-1-dbrazdil@google.com>
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This patch is part of a series which builds KVM's non-VHE hyp code separately
from VHE and the rest of the kernel.

timer-sr.c contains a HVC handler for setting CNTVOFF_EL2 and two helper
functions for controlling access to physical counter. The former is shared
between VHE/nVHE and is kept in timer-sr.c but compiled under both configs.
The latter are nVHE-specific and are moved to nvhe/timer-sr.c.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/include/asm/kvm_hyp.h   |  2 ++
 arch/arm64/kernel/image-vars.h     |  3 ---
 arch/arm64/kvm/hyp/nvhe/Makefile   |  3 ++-
 arch/arm64/kvm/hyp/nvhe/timer-sr.c | 43 ++++++++++++++++++++++++++++++
 arch/arm64/kvm/hyp/timer-sr.c      | 36 -------------------------
 5 files changed, 47 insertions(+), 40 deletions(-)
 create mode 100644 arch/arm64/kvm/hyp/nvhe/timer-sr.c

diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h
index c8bbd221aac0..8a1510f521fe 100644
--- a/arch/arm64/include/asm/kvm_hyp.h
+++ b/arch/arm64/include/asm/kvm_hyp.h
@@ -63,8 +63,10 @@ void __vgic_v3_save_aprs(struct vgic_v3_cpu_if *cpu_if);
 void __vgic_v3_restore_aprs(struct vgic_v3_cpu_if *cpu_if);
 int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu);
 
+#ifdef __KVM_NVHE_HYPERVISOR__
 void __timer_enable_traps(struct kvm_vcpu *vcpu);
 void __timer_disable_traps(struct kvm_vcpu *vcpu);
+#endif
 
 #ifdef __KVM_NVHE_HYPERVISOR__
 void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt);
diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
index ddaae7267ab1..94bfc61b3f51 100644
--- a/arch/arm64/kernel/image-vars.h
+++ b/arch/arm64/kernel/image-vars.h
@@ -68,9 +68,6 @@ __kvm_nvhe___guest_exit = __guest_exit;
 __kvm_nvhe___hyp_panic_string = __hyp_panic_string;
 __kvm_nvhe___hyp_stub_vectors = __hyp_stub_vectors;
 __kvm_nvhe___icache_flags = __icache_flags;
-__kvm_nvhe___kvm_timer_set_cntvoff = __kvm_timer_set_cntvoff;
-__kvm_nvhe___timer_disable_traps = __timer_disable_traps;
-__kvm_nvhe___timer_enable_traps = __timer_enable_traps;
 __kvm_nvhe___vgic_v2_perform_cpuif_access = __vgic_v2_perform_cpuif_access;
 __kvm_nvhe___vgic_v3_activate_traps = __vgic_v3_activate_traps;
 __kvm_nvhe___vgic_v3_deactivate_traps = __vgic_v3_deactivate_traps;
diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
index d242e437cf89..4ec34abce0a9 100644
--- a/arch/arm64/kvm/hyp/nvhe/Makefile
+++ b/arch/arm64/kvm/hyp/nvhe/Makefile
@@ -7,7 +7,8 @@ asflags-y := -D__KVM_NVHE_HYPERVISOR__
 ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -fno-stack-protector \
 	     -DDISABLE_BRANCH_PROFILING $(DISABLE_STACKLEAK_PLUGIN)
 
-obj-y := sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o ../hyp-entry.o
+obj-y := ../timer-sr.o timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o \
+	 hyp-init.o ../hyp-entry.o
 
 obj-y := $(patsubst %.o,%.hyp.o,$(obj-y))
 extra-y := $(patsubst %.hyp.o,%.hyp.tmp.o,$(obj-y))
diff --git a/arch/arm64/kvm/hyp/nvhe/timer-sr.c b/arch/arm64/kvm/hyp/nvhe/timer-sr.c
new file mode 100644
index 000000000000..f0e694743883
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/timer-sr.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012-2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <clocksource/arm_arch_timer.h>
+#include <linux/compiler.h>
+#include <linux/kvm_host.h>
+
+#include <asm/kvm_hyp.h>
+
+/*
+ * Should only be called on non-VHE systems.
+ * VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
+ */
+void __hyp_text __timer_disable_traps(struct kvm_vcpu *vcpu)
+{
+	u64 val;
+
+	/* Allow physical timer/counter access for the host */
+	val = read_sysreg(cnthctl_el2);
+	val |= CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN;
+	write_sysreg(val, cnthctl_el2);
+}
+
+/*
+ * Should only be called on non-VHE systems.
+ * VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
+ */
+void __hyp_text __timer_enable_traps(struct kvm_vcpu *vcpu)
+{
+	u64 val;
+
+	/*
+	 * Disallow physical timer access for the guest
+	 * Physical counter access is allowed
+	 */
+	val = read_sysreg(cnthctl_el2);
+	val &= ~CNTHCTL_EL1PCEN;
+	val |= CNTHCTL_EL1PCTEN;
+	write_sysreg(val, cnthctl_el2);
+}
diff --git a/arch/arm64/kvm/hyp/timer-sr.c b/arch/arm64/kvm/hyp/timer-sr.c
index fb5c0be33223..6c620d807857 100644
--- a/arch/arm64/kvm/hyp/timer-sr.c
+++ b/arch/arm64/kvm/hyp/timer-sr.c
@@ -4,45 +4,9 @@
  * Author: Marc Zyngier <marc.zyngier@arm.com>
  */
 
-#include <clocksource/arm_arch_timer.h>
-#include <linux/compiler.h>
-#include <linux/kvm_host.h>
-
 #include <asm/kvm_hyp.h>
 
 void __hyp_text __kvm_timer_set_cntvoff(u64 cntvoff)
 {
 	write_sysreg(cntvoff, cntvoff_el2);
 }
-
-/*
- * Should only be called on non-VHE systems.
- * VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
- */
-void __hyp_text __timer_disable_traps(struct kvm_vcpu *vcpu)
-{
-	u64 val;
-
-	/* Allow physical timer/counter access for the host */
-	val = read_sysreg(cnthctl_el2);
-	val |= CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN;
-	write_sysreg(val, cnthctl_el2);
-}
-
-/*
- * Should only be called on non-VHE systems.
- * VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
- */
-void __hyp_text __timer_enable_traps(struct kvm_vcpu *vcpu)
-{
-	u64 val;
-
-	/*
-	 * Disallow physical timer access for the guest
-	 * Physical counter access is allowed
-	 */
-	val = read_sysreg(cnthctl_el2);
-	val &= ~CNTHCTL_EL1PCEN;
-	val |= CNTHCTL_EL1PCTEN;
-	write_sysreg(val, cnthctl_el2);
-}
-- 
2.27.0