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From: Atish Patra <atish.patra@wdc.com>
To: kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org
Cc: Atish Patra <atish.patra@wdc.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Anup Patel <anup.patel@wdc.com>,
	Kefeng Wang <wangkefeng.wang@huawei.com>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Alexander Graf <graf@amazon.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Alistair Francis <Alistair.Francis@wdc.com>
Subject: [PATCH 3/6] RISC-V: Reorganize SBI code by moving legacy SBI to its own file
Date: Mon,  3 Aug 2020 10:58:43 -0700	[thread overview]
Message-ID: <20200803175846.26272-4-atish.patra@wdc.com> (raw)
In-Reply-To: <20200803175846.26272-1-atish.patra@wdc.com>

With SBI v0.2, there may be more SBI extensions in future. It makes more
sense to group related extensions in separate files. Guest kernel will
choose appropriate SBI version dynamically.

Move the existing implementation to a separate file so that it can be
removed in future without much conflict.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
---
 arch/riscv/include/asm/kvm_vcpu_sbi.h |   1 +
 arch/riscv/kvm/Makefile               |   2 +-
 arch/riscv/kvm/vcpu_sbi.c             | 126 +------------------------
 arch/riscv/kvm/vcpu_sbi_legacy.c      | 129 ++++++++++++++++++++++++++
 4 files changed, 136 insertions(+), 122 deletions(-)
 create mode 100644 arch/riscv/kvm/vcpu_sbi_legacy.c

diff --git a/arch/riscv/include/asm/kvm_vcpu_sbi.h b/arch/riscv/include/asm/kvm_vcpu_sbi.h
index 5b3523a01bce..743c71f0c331 100644
--- a/arch/riscv/include/asm/kvm_vcpu_sbi.h
+++ b/arch/riscv/include/asm/kvm_vcpu_sbi.h
@@ -25,5 +25,6 @@ struct kvm_vcpu_sbi_extension {
 		       bool *exit);
 };
 
+void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run);
 const struct kvm_vcpu_sbi_extension *kvm_vcpu_sbi_find_ext(unsigned long extid);
 #endif /* __RISCV_KVM_VCPU_SBI_H__ */
diff --git a/arch/riscv/kvm/Makefile b/arch/riscv/kvm/Makefile
index b56dc1650d2c..8efb78faab5a 100644
--- a/arch/riscv/kvm/Makefile
+++ b/arch/riscv/kvm/Makefile
@@ -9,6 +9,6 @@ ccflags-y := -Ivirt/kvm -Iarch/riscv/kvm
 kvm-objs := $(common-objs-y)
 
 kvm-objs += main.o vm.o vmid.o tlb.o mmu.o
-kvm-objs += vcpu.o vcpu_exit.o vcpu_switch.o vcpu_timer.o vcpu_sbi.o
+kvm-objs += vcpu.o vcpu_exit.o vcpu_switch.o vcpu_timer.o vcpu_sbi.o vcpu_sbi_legacy.o
 
 obj-$(CONFIG_KVM)	+= kvm.o
diff --git a/arch/riscv/kvm/vcpu_sbi.c b/arch/riscv/kvm/vcpu_sbi.c
index efddac5362a9..85bb7491c0e0 100644
--- a/arch/riscv/kvm/vcpu_sbi.c
+++ b/arch/riscv/kvm/vcpu_sbi.c
@@ -9,9 +9,7 @@
 #include <linux/errno.h>
 #include <linux/err.h>
 #include <linux/kvm_host.h>
-#include <asm/csr.h>
 #include <asm/sbi.h>
-#include <asm/kvm_vcpu_timer.h>
 #include <asm/kvm_vcpu_sbi.h>
 
 static int kvm_linux_err_map_sbi(int err)
@@ -32,23 +30,12 @@ static int kvm_linux_err_map_sbi(int err)
 	};
 }
 
-static void kvm_sbi_system_shutdown(struct kvm_vcpu *vcpu,
-				    struct kvm_run *run, u32 type)
-{
-	int i;
-	struct kvm_vcpu *tmp;
-
-	kvm_for_each_vcpu(i, tmp, vcpu->kvm)
-		tmp->arch.power_off = true;
-	kvm_make_all_cpus_request(vcpu->kvm, KVM_REQ_SLEEP);
-
-	memset(&run->system_event, 0, sizeof(run->system_event));
-	run->system_event.type = type;
-	run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
-}
+extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_legacy;
+static const struct kvm_vcpu_sbi_extension *sbi_ext[] = {
+	&vcpu_sbi_ext_legacy,
+};
 
-static void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu,
-				       struct kvm_run *run)
+void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run)
 {
 	struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
 
@@ -86,109 +73,6 @@ int kvm_riscv_vcpu_sbi_return(struct kvm_vcpu *vcpu, struct kvm_run *run)
 	return 0;
 }
 
-static int kvm_sbi_ext_legacy_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
-				      unsigned long *out_val,
-				      struct kvm_cpu_trap *utrap,
-				      bool *exit)
-{
-	ulong hmask;
-	int i, ret = 0;
-	u64 next_cycle;
-	struct kvm_vcpu *rvcpu;
-	struct cpumask cm, hm;
-	struct kvm *kvm = vcpu->kvm;
-	struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
-
-	if (!cp)
-		return -EINVAL;
-
-	switch (cp->a7) {
-	case SBI_EXT_0_1_CONSOLE_GETCHAR:
-	case SBI_EXT_0_1_CONSOLE_PUTCHAR:
-		/*
-		 * The CONSOLE_GETCHAR/CONSOLE_PUTCHAR SBI calls cannot be
-		 * handled in kernel so we forward these to user-space
-		 */
-		kvm_riscv_vcpu_sbi_forward(vcpu, run);
-		*exit = true;
-		break;
-	case SBI_EXT_0_1_SET_TIMER:
-#if __riscv_xlen == 32
-		next_cycle = ((u64)cp->a1 << 32) | (u64)cp->a0;
-#else
-		next_cycle = (u64)cp->a0;
-#endif
-		ret = kvm_riscv_vcpu_timer_next_event(vcpu, next_cycle);
-		break;
-	case SBI_EXT_0_1_CLEAR_IPI:
-		ret = kvm_riscv_vcpu_unset_interrupt(vcpu, IRQ_VS_SOFT);
-		break;
-	case SBI_EXT_0_1_SEND_IPI:
-		if (cp->a0)
-			hmask = kvm_riscv_vcpu_unpriv_read(vcpu, false, cp->a0,
-							   utrap);
-		else
-			hmask = (1UL << atomic_read(&kvm->online_vcpus)) - 1;
-		if (utrap->scause)
-			break;
-
-		for_each_set_bit(i, &hmask, BITS_PER_LONG) {
-			rvcpu = kvm_get_vcpu_by_id(vcpu->kvm, i);
-			ret = kvm_riscv_vcpu_set_interrupt(rvcpu, IRQ_VS_SOFT);
-			if (ret < 0)
-				break;
-		}
-		break;
-	case SBI_EXT_0_1_SHUTDOWN:
-		kvm_sbi_system_shutdown(vcpu, run, KVM_SYSTEM_EVENT_SHUTDOWN);
-		*exit = true;
-		break;
-	case SBI_EXT_0_1_REMOTE_FENCE_I:
-	case SBI_EXT_0_1_REMOTE_SFENCE_VMA:
-	case SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID:
-		if (cp->a0)
-			hmask = kvm_riscv_vcpu_unpriv_read(vcpu, false, cp->a0,
-							   utrap);
-		else
-			hmask = (1UL << atomic_read(&kvm->online_vcpus)) - 1;
-		if (utrap->scause)
-			break;
-
-		cpumask_clear(&cm);
-		for_each_set_bit(i, &hmask, BITS_PER_LONG) {
-			rvcpu = kvm_get_vcpu_by_id(vcpu->kvm, i);
-			if (rvcpu->cpu < 0)
-				continue;
-			cpumask_set_cpu(rvcpu->cpu, &cm);
-		}
-		riscv_cpuid_to_hartid_mask(&cm, &hm);
-		if (cp->a7 == SBI_EXT_0_1_REMOTE_FENCE_I)
-			ret = sbi_remote_fence_i(cpumask_bits(&hm));
-		else if (cp->a7 == SBI_EXT_0_1_REMOTE_SFENCE_VMA)
-			ret = sbi_remote_hfence_vvma(cpumask_bits(&hm),
-						cp->a1, cp->a2);
-		else
-			ret = sbi_remote_hfence_vvma_asid(cpumask_bits(&hm),
-						cp->a1, cp->a2, cp->a3);
-		break;
-	default:
-		ret = -EINVAL;
-		break;
-	};
-
-	return ret;
-}
-
-const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_legacy = {
-	.extid_start = SBI_EXT_0_1_SET_TIMER,
-	.extid_end = SBI_EXT_0_1_SHUTDOWN,
-	.handler = kvm_sbi_ext_legacy_handler,
-};
-
-static const struct kvm_vcpu_sbi_extension *sbi_ext[] = {
-	&vcpu_sbi_ext_legacy,
-};
-
 const struct kvm_vcpu_sbi_extension *kvm_vcpu_sbi_find_ext(unsigned long extid)
 {
 	int i = 0;
diff --git a/arch/riscv/kvm/vcpu_sbi_legacy.c b/arch/riscv/kvm/vcpu_sbi_legacy.c
new file mode 100644
index 000000000000..126d97b1292d
--- /dev/null
+++ b/arch/riscv/kvm/vcpu_sbi_legacy.c
@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *     Atish Patra <atish.patra@wdc.com>
+ */
+
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/kvm_host.h>
+#include <asm/csr.h>
+#include <asm/sbi.h>
+#include <asm/kvm_vcpu_timer.h>
+#include <asm/kvm_vcpu_sbi.h>
+
+static void kvm_sbi_system_shutdown(struct kvm_vcpu *vcpu,
+				    struct kvm_run *run, u32 type)
+{
+	int i;
+	struct kvm_vcpu *tmp;
+
+	kvm_for_each_vcpu(i, tmp, vcpu->kvm)
+		tmp->arch.power_off = true;
+	kvm_make_all_cpus_request(vcpu->kvm, KVM_REQ_SLEEP);
+
+	memset(&run->system_event, 0, sizeof(run->system_event));
+	run->system_event.type = type;
+	run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
+}
+
+static int kvm_sbi_ext_legacy_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
+				      unsigned long *out_val,
+				      struct kvm_cpu_trap *utrap,
+				      bool *exit)
+{
+	ulong hmask;
+	int i, ret = 0;
+	u64 next_cycle;
+	struct kvm_vcpu *rvcpu;
+	struct cpumask cm, hm;
+	struct kvm *kvm = vcpu->kvm;
+	struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
+
+	if (!cp)
+		return -EINVAL;
+
+	switch (cp->a7) {
+	case SBI_EXT_0_1_CONSOLE_GETCHAR:
+	case SBI_EXT_0_1_CONSOLE_PUTCHAR:
+		/*
+		 * The CONSOLE_GETCHAR/CONSOLE_PUTCHAR SBI calls cannot be
+		 * handled in kernel so we forward these to user-space
+		 */
+		kvm_riscv_vcpu_sbi_forward(vcpu, run);
+		*exit = true;
+		break;
+	case SBI_EXT_0_1_SET_TIMER:
+#if __riscv_xlen == 32
+		next_cycle = ((u64)cp->a1 << 32) | (u64)cp->a0;
+#else
+		next_cycle = (u64)cp->a0;
+#endif
+		ret = kvm_riscv_vcpu_timer_next_event(vcpu, next_cycle);
+		break;
+	case SBI_EXT_0_1_CLEAR_IPI:
+		ret = kvm_riscv_vcpu_unset_interrupt(vcpu, IRQ_VS_SOFT);
+		break;
+	case SBI_EXT_0_1_SEND_IPI:
+		if (cp->a0)
+			hmask = kvm_riscv_vcpu_unpriv_read(vcpu, false, cp->a0,
+							   utrap);
+		else
+			hmask = (1UL << atomic_read(&kvm->online_vcpus)) - 1;
+		if (utrap->scause)
+			break;
+
+		for_each_set_bit(i, &hmask, BITS_PER_LONG) {
+			rvcpu = kvm_get_vcpu_by_id(vcpu->kvm, i);
+			ret = kvm_riscv_vcpu_set_interrupt(rvcpu, IRQ_VS_SOFT);
+			if (ret < 0)
+				break;
+		}
+		break;
+	case SBI_EXT_0_1_SHUTDOWN:
+		kvm_sbi_system_shutdown(vcpu, run, KVM_SYSTEM_EVENT_SHUTDOWN);
+		*exit = true;
+		break;
+	case SBI_EXT_0_1_REMOTE_FENCE_I:
+	case SBI_EXT_0_1_REMOTE_SFENCE_VMA:
+	case SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID:
+		if (cp->a0)
+			hmask = kvm_riscv_vcpu_unpriv_read(vcpu, false, cp->a0,
+							   utrap);
+		else
+			hmask = (1UL << atomic_read(&kvm->online_vcpus)) - 1;
+		if (utrap->scause)
+			break;
+
+		cpumask_clear(&cm);
+		for_each_set_bit(i, &hmask, BITS_PER_LONG) {
+			rvcpu = kvm_get_vcpu_by_id(vcpu->kvm, i);
+			if (rvcpu->cpu < 0)
+				continue;
+			cpumask_set_cpu(rvcpu->cpu, &cm);
+		}
+		riscv_cpuid_to_hartid_mask(&cm, &hm);
+		if (cp->a7 == SBI_EXT_0_1_REMOTE_FENCE_I)
+			ret = sbi_remote_fence_i(cpumask_bits(&hm));
+		else if (cp->a7 == SBI_EXT_0_1_REMOTE_SFENCE_VMA)
+			ret = sbi_remote_hfence_vvma(cpumask_bits(&hm),
+						cp->a1, cp->a2);
+		else
+			ret = sbi_remote_hfence_vvma_asid(cpumask_bits(&hm),
+						cp->a1, cp->a2, cp->a3);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	};
+
+	return ret;
+}
+
+const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_legacy = {
+	.extid_start = SBI_EXT_0_1_SET_TIMER,
+	.extid_end = SBI_EXT_0_1_SHUTDOWN,
+	.handler = kvm_sbi_ext_legacy_handler,
+};
-- 
2.24.0


  parent reply	other threads:[~2020-08-03 17:59 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-03 17:58 [PATCH 0/6] Add SBI v0.2 support for KVM Atish Patra
2020-08-03 17:58 ` [PATCH 1/6] RISC-V: Add a non-void return for sbi v02 functions Atish Patra
2020-08-03 17:58 ` [PATCH 2/6] RISC-V: Mark the existing SBI v0.1 implementation as legacy Atish Patra
2020-08-03 17:58 ` Atish Patra [this message]
2020-08-03 17:58 ` [PATCH 4/6] RISC-V: Add SBI v0.2 base extension Atish Patra
2020-08-03 17:58 ` [PATCH 5/6] RISC-V: Add v0.1 replacement SBI extensions defined in v02 Atish Patra
2020-08-03 17:58 ` [PATCH 6/6] RISC-V: Add SBI HSM extension in KVM Atish Patra
2020-11-27  8:14 ` [PATCH 0/6] Add SBI v0.2 support for KVM Anup Patel
2020-12-01  1:06   ` Atish Patra

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