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Date: Mon, 3 Aug 2020 10:58:44 -0700
From: Atish Patra <atish.patra@....com>
To: kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org
Cc: Atish Patra <atish.patra@....com>,
Albert Ou <aou@...s.berkeley.edu>,
Anup Patel <anup.patel@....com>,
Kefeng Wang <wangkefeng.wang@...wei.com>, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org, Palmer Dabbelt <palmer@...belt.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Thomas Gleixner <tglx@...utronix.de>,
Alexander Graf <graf@...zon.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Alistair Francis <Alistair.Francis@....com>
Subject: [PATCH 4/6] RISC-V: Add SBI v0.2 base extension
SBI v0.2 base extension defined to allow backward compatibility and
probing of future extensions. This is also the only mandatory SBI
extension that must be implemented by SBI implementors.
Signed-off-by: Atish Patra <atish.patra@....com>
---
arch/riscv/include/asm/kvm_vcpu_sbi.h | 2 +
arch/riscv/include/asm/sbi.h | 8 +++
arch/riscv/kvm/Makefile | 4 +-
arch/riscv/kvm/vcpu_sbi.c | 3 ++
arch/riscv/kvm/vcpu_sbi_base.c | 73 +++++++++++++++++++++++++++
5 files changed, 88 insertions(+), 2 deletions(-)
create mode 100644 arch/riscv/kvm/vcpu_sbi_base.c
diff --git a/arch/riscv/include/asm/kvm_vcpu_sbi.h b/arch/riscv/include/asm/kvm_vcpu_sbi.h
index 743c71f0c331..e208c8ac57fe 100644
--- a/arch/riscv/include/asm/kvm_vcpu_sbi.h
+++ b/arch/riscv/include/asm/kvm_vcpu_sbi.h
@@ -9,6 +9,8 @@
#ifndef __RISCV_KVM_VCPU_SBI_H__
#define __RISCV_KVM_VCPU_SBI_H__
+#define KVM_SBI_IMPID 3
+
#define KVM_SBI_VERSION_MAJOR 0
#define KVM_SBI_VERSION_MINOR 2
diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
index 2355515785eb..7d8f2b389253 100644
--- a/arch/riscv/include/asm/sbi.h
+++ b/arch/riscv/include/asm/sbi.h
@@ -27,6 +27,14 @@ enum sbi_ext_id {
SBI_EXT_IPI = 0x735049,
SBI_EXT_RFENCE = 0x52464E43,
SBI_EXT_HSM = 0x48534D,
+
+ /* Experimentals extensions must lie within this range */
+ SBI_EXT_EXPERIMENTAL_START = 0x0800000,
+ SBI_EXT_EXPERIMENTAL_END = 0x08FFFFFF,
+
+ /* Vendor extensions must lie within this range */
+ SBI_EXT_VENDOR_START = 0x09000000,
+ SBI_EXT_VENDOR_END = 0x09FFFFFF,
};
enum sbi_ext_base_fid {
diff --git a/arch/riscv/kvm/Makefile b/arch/riscv/kvm/Makefile
index 8efb78faab5a..a95c91ba9a51 100644
--- a/arch/riscv/kvm/Makefile
+++ b/arch/riscv/kvm/Makefile
@@ -9,6 +9,6 @@ ccflags-y := -Ivirt/kvm -Iarch/riscv/kvm
kvm-objs := $(common-objs-y)
kvm-objs += main.o vm.o vmid.o tlb.o mmu.o
-kvm-objs += vcpu.o vcpu_exit.o vcpu_switch.o vcpu_timer.o vcpu_sbi.o vcpu_sbi_legacy.o
-
+kvm-objs += vcpu.o vcpu_exit.o vcpu_switch.o vcpu_timer.o
+kvm-objs += vcpu_sbi.o vcpu_sbi_base.o vcpu_sbi_legacy.o
obj-$(CONFIG_KVM) += kvm.o
diff --git a/arch/riscv/kvm/vcpu_sbi.c b/arch/riscv/kvm/vcpu_sbi.c
index 85bb7491c0e0..bb50d63f78e7 100644
--- a/arch/riscv/kvm/vcpu_sbi.c
+++ b/arch/riscv/kvm/vcpu_sbi.c
@@ -31,8 +31,11 @@ static int kvm_linux_err_map_sbi(int err)
}
extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_legacy;
+extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_base;
+
static const struct kvm_vcpu_sbi_extension *sbi_ext[] = {
&vcpu_sbi_ext_legacy,
+ &vcpu_sbi_ext_base,
};
void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run)
diff --git a/arch/riscv/kvm/vcpu_sbi_base.c b/arch/riscv/kvm/vcpu_sbi_base.c
new file mode 100644
index 000000000000..025d0eae50b0
--- /dev/null
+++ b/arch/riscv/kvm/vcpu_sbi_base.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ * Atish Patra <atish.patra@....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 int kvm_sbi_ext_base_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
+ unsigned long *out_val,
+ struct kvm_cpu_trap *trap, bool *exit)
+{
+ int ret = 0;
+ struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
+ struct sbiret ecall_ret;
+
+ if (!cp)
+ return -EINVAL;
+
+ switch (cp->a6) {
+ case SBI_EXT_BASE_GET_SPEC_VERSION:
+ *out_val = (KVM_SBI_VERSION_MAJOR <<
+ SBI_SPEC_VERSION_MAJOR_SHIFT) |
+ KVM_SBI_VERSION_MINOR;
+ break;
+ case SBI_EXT_BASE_GET_IMP_ID:
+ *out_val = KVM_SBI_IMPID;
+ break;
+ case SBI_EXT_BASE_GET_IMP_VERSION:
+ *out_val = 0;
+ break;
+ case SBI_EXT_BASE_PROBE_EXT:
+ *out_val = kvm_vcpu_sbi_find_ext(cp->a0) ? 1 : 0;
+ if ((!*out_val) &&
+ ((cp->a0 >= SBI_EXT_EXPERIMENTAL_START &&
+ cp->a0 <= SBI_EXT_EXPERIMENTAL_END) ||
+ ((cp->a0 >= SBI_EXT_VENDOR_START &&
+ cp->a0 <= SBI_EXT_VENDOR_END)))) {
+ /* For experimental/vendor extensions forward to the userspace*/
+ kvm_riscv_vcpu_sbi_forward(vcpu, run);
+ *exit = true;
+ }
+ break;
+ case SBI_EXT_BASE_GET_MVENDORID:
+ case SBI_EXT_BASE_GET_MARCHID:
+ case SBI_EXT_BASE_GET_MIMPID:
+ ecall_ret = sbi_ecall(SBI_EXT_BASE, cp->a6, 0, 0, 0, 0, 0, 0);
+ if (!ecall_ret.error)
+ *out_val = ecall_ret.value;
+ /*TODO: We are unnecessarily converting the error twice */
+ ret = sbi_err_map_linux_errno(ecall_ret.error);
+ break;
+ default:
+ ret = -ENOTSUPP;
+ break;
+ }
+
+ return ret;
+}
+
+const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_base = {
+ .extid_start = SBI_EXT_BASE,
+ .extid_end = SBI_EXT_BASE,
+ .handler = kvm_sbi_ext_base_handler,
+};
--
2.24.0
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