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Date: Fri, 5 Nov 2021 16:58:50 -0700
From: Atish Patra <atish.patra@....com>
To: linux-kernel@...r.kernel.org
Cc: Atish Patra <atish.patra@....com>, Anup Patel <anup.patel@....com>,
Heinrich Schuchardt <xypron.glpk@....de>,
kvm-riscv@...ts.infradead.org, kvm@...r.kernel.org,
linux-riscv@...ts.infradead.org,
Palmer Dabbelt <palmer@...belt.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Vincent Chen <vincent.chen@...ive.com>, pbonzini@...hat.com,
Sean Christopherson <seanjc@...gle.com>
Subject: [PATCH v4 3/5] RISC-V: KVM: 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 | 1 +
arch/riscv/kvm/vcpu_sbi.c | 3 +-
arch/riscv/kvm/vcpu_sbi_base.c | 73 +++++++++++++++++++++++++++
5 files changed, 86 insertions(+), 1 deletion(-)
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 704151969ceb..76e4e17a3e00 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 0d42693cb65e..4f9370b6032e 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 d3d5ff3a6019..84c02922a329 100644
--- a/arch/riscv/kvm/Makefile
+++ b/arch/riscv/kvm/Makefile
@@ -24,4 +24,5 @@ kvm-y += vcpu_fp.o
kvm-y += vcpu_switch.o
kvm-y += vcpu_sbi.o
kvm-$(CONFIG_RISCV_SBI_V01) += vcpu_sbi_v01.o
+kvm-y += vcpu_sbi_base.o
kvm-y += vcpu_timer.o
diff --git a/arch/riscv/kvm/vcpu_sbi.c b/arch/riscv/kvm/vcpu_sbi.c
index 06b42f6977e1..92b682f4f29e 100644
--- a/arch/riscv/kvm/vcpu_sbi.c
+++ b/arch/riscv/kvm/vcpu_sbi.c
@@ -39,9 +39,10 @@ static const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_v01 = {
.handler = NULL,
};
#endif
-
+extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_base;
static const struct kvm_vcpu_sbi_extension *sbi_ext[] = {
&vcpu_sbi_ext_v01,
+ &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..1aeda3e10e7c
--- /dev/null
+++ b/arch/riscv/kvm/vcpu_sbi_base.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2021 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 = -EOPNOTSUPP;
+ 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,
+};
--
2.31.1
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