[RFC PATCH v9 6/8] psci: Add hvc call service for ptp_kvm.

From: Jianyong Wu <jianyong.wu@arm.com>
To: netdev@vger.kernel.org, yangbo.lu@nxp.com,
	john.stultz@linaro.org, tglx@linutronix.de, pbonzini@redhat.com,
	sean.j.christopherson@intel.com, maz@kernel.org,
	richardcochran@gmail.com, Mark.Rutland@arm.com, will@kernel.org,
	suzuki.poulose@arm.com, steven.price@arm.com
Cc: justin.he@arm.com, kvm@vger.kernel.org, Steve.Capper@arm.com,
	jianyong.wu@arm.com, linux-kernel@vger.kernel.org,
	Kaly.Xin@arm.com, nd@arm.com, kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH v9 6/8] psci: Add hvc call service for ptp_kvm.
Date: Tue, 10 Dec 2019 11:40:24 +0800	[thread overview]
Message-ID: <20191210034026.45229-7-jianyong.wu@arm.com> (raw)
In-Reply-To: <20191210034026.45229-1-jianyong.wu@arm.com>

ptp_kvm modules will call hvc to get this service.
The service offers real time and counter cycle of host for guest.

Signed-off-by: Jianyong Wu <jianyong.wu@arm.com>
---
 include/linux/arm-smccc.h | 12 ++++++++++++
 virt/kvm/arm/psci.c       | 22 ++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h
index 6f82c87308ed..aafb6bac167d 100644
--- a/include/linux/arm-smccc.h
+++ b/include/linux/arm-smccc.h
@@ -94,6 +94,7 @@
 
 /* KVM "vendor specific" services */
 #define ARM_SMCCC_KVM_FUNC_FEATURES		0
+#define ARM_SMCCC_KVM_PTP			1
 #define ARM_SMCCC_KVM_FUNC_FEATURES_2		127
 #define ARM_SMCCC_KVM_NUM_FUNCS			128
 
@@ -103,6 +104,17 @@
 			   ARM_SMCCC_OWNER_VENDOR_HYP,			\
 			   ARM_SMCCC_KVM_FUNC_FEATURES)
 
+/*
+ * This ID used for virtual ptp kvm clock and it will pass second value
+ * and nanosecond value of host real time and system counter by vcpu
+ * register to guest.
+ */
+#define ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID				\
+	ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL,				\
+			   ARM_SMCCC_SMC_32,				\
+			   ARM_SMCCC_OWNER_VENDOR_HYP,			\
+			   ARM_SMCCC_KVM_PTP)
+
 #ifndef __ASSEMBLY__
 
 #include <linux/linkage.h>
diff --git a/virt/kvm/arm/psci.c b/virt/kvm/arm/psci.c
index 0debf49bf259..682d892d6717 100644
--- a/virt/kvm/arm/psci.c
+++ b/virt/kvm/arm/psci.c
@@ -9,6 +9,7 @@
 #include <linux/kvm_host.h>
 #include <linux/uaccess.h>
 #include <linux/wait.h>
+#include <linux/clocksource_ids.h>
 
 #include <asm/cputype.h>
 #include <asm/kvm_emulate.h>
@@ -389,6 +390,8 @@ static int kvm_psci_call(struct kvm_vcpu *vcpu)
 
 int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
 {
+	struct system_time_snapshot systime_snapshot;
+	u64 cycles;
 	u32 func_id = smccc_get_function(vcpu);
 	u32 val[4] = {};
 	u32 option;
@@ -431,6 +434,25 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
 	case ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID:
 		val[0] = BIT(ARM_SMCCC_KVM_FUNC_FEATURES);
 		break;
+	/*
+	 * This will used for virtual ptp kvm clock. three
+	 * values will be passed back.
+	 * reg0 stores high 32-bit host ktime;
+	 * reg1 stores low 32-bit host ktime;
+	 * reg2 stores high 32-bit difference of host cycles and cntvoff;
+	 * reg3 stores low 32-bit difference of host cycles and cntvoff.
+	 */
+	case ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID:
+		ktime_get_snapshot(&systime_snapshot);
+		if (systime_snapshot.cs_id != CSID_ARM_ARCH_COUNTER)
+			return kvm_psci_call(vcpu);
+		val[0] = systime_snapshot.real >> 32;
+		val[1] = systime_snapshot.real << 32 >> 32;
+		cycles = systime_snapshot.cycles -
+			 vcpu_vtimer(vcpu)->cntvoff;
+		val[2] = cycles >> 32;
+		val[3] = cycles << 32 >> 32;
+		break;
 	default:
 		return kvm_psci_call(vcpu);
 	}
-- 
2.17.1


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