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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/riscv/kvm/vcpu_sbi_base.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/riscv/kvm/vcpu_sbi_base.c')
-rw-r--r--arch/riscv/kvm/vcpu_sbi_base.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/arch/riscv/kvm/vcpu_sbi_base.c b/arch/riscv/kvm/vcpu_sbi_base.c
new file mode 100644
index 000000000..48f431091
--- /dev/null
+++ b/arch/riscv/kvm/vcpu_sbi_base.c
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2021 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 <linux/version.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;
+
+ 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 = LINUX_VERSION_CODE;
+ break;
+ case SBI_EXT_BASE_PROBE_EXT:
+ if ((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 it to the userspace
+ */
+ kvm_riscv_vcpu_sbi_forward(vcpu, run);
+ *exit = true;
+ } else
+ *out_val = kvm_vcpu_sbi_find_ext(cp->a0) ? 1 : 0;
+ 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,
+};
+
+static int kvm_sbi_ext_forward_handler(struct kvm_vcpu *vcpu,
+ struct kvm_run *run,
+ unsigned long *out_val,
+ struct kvm_cpu_trap *utrap,
+ bool *exit)
+{
+ /*
+ * Both SBI experimental and vendor extensions are
+ * unconditionally forwarded to userspace.
+ */
+ kvm_riscv_vcpu_sbi_forward(vcpu, run);
+ *exit = true;
+ return 0;
+}
+
+const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_experimental = {
+ .extid_start = SBI_EXT_EXPERIMENTAL_START,
+ .extid_end = SBI_EXT_EXPERIMENTAL_END,
+ .handler = kvm_sbi_ext_forward_handler,
+};
+
+const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_vendor = {
+ .extid_start = SBI_EXT_VENDOR_START,
+ .extid_end = SBI_EXT_VENDOR_END,
+ .handler = kvm_sbi_ext_forward_handler,
+};