[PATCH RFC v4 06/15] target/riscv: Support start kernel directly by KVM
Get kernel and fdt start address in virt.c, and pass them to KVM
when cpu reset. In addition, add kvm_riscv.h to place riscv specific
interface.
Signed-off-by: Yifei Jiang <jiangyifei(a)huawei.com>
Signed-off-by: Yipeng Yin <yinyipeng1(a)huawei.com>
---
hw/riscv/virt.c | 8 ++++++++
target/riscv/cpu.c | 4 ++++
target/riscv/cpu.h | 3 +++
target/riscv/kvm.c | 15 +++++++++++++++
target/riscv/kvm_riscv.h | 24 ++++++++++++++++++++++++
5 files changed, 54 insertions(+)
create mode 100644 target/riscv/kvm_riscv.h
diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
index 25cea7aa67..47b7018193 100644
--- a/hw/riscv/virt.c
+++ b/hw/riscv/virt.c
@@ -42,6 +42,7 @@
#include "sysemu/sysemu.h"
#include "hw/pci/pci.h"
#include "hw/pci-host/gpex.h"
+#include "sysemu/kvm.h"
#if defined(TARGET_RISCV32)
# define BIOS_FILENAME "opensbi-riscv32-generic-fw_dynamic.bin"
@@ -511,6 +512,7 @@ static void virt_machine_init(MachineState *machine)
uint64_t kernel_entry;
DeviceState *mmio_plic, *virtio_plic, *pcie_plic;
int i, j, base_hartid, hart_count;
+ CPUState *cs;
/* Check socket count limit */
if (VIRT_SOCKETS_MAX < riscv_socket_count(machine)) {
@@ -660,6 +662,12 @@ static void virt_machine_init(MachineState *machine)
virt_memmap[VIRT_MROM].size, kernel_entry,
fdt_load_addr, s->fdt);
+ for (cs = first_cpu; cs; cs = CPU_NEXT(cs)) {
+ RISCVCPU *riscv_cpu = RISCV_CPU(cs);
+ riscv_cpu->env.kernel_addr = kernel_entry;
+ riscv_cpu->env.fdt_addr = fdt_load_addr;
+ }
+
/* SiFive Test MMIO device */
sifive_test_create(memmap[VIRT_TEST].base);
diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 6a0264fc6b..faee98a58c 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -29,6 +29,7 @@
#include "hw/qdev-properties.h"
#include "migration/vmstate.h"
#include "fpu/softfloat-helpers.h"
+#include "kvm_riscv.h"
/* RISC-V CPU definitions */
@@ -330,6 +331,9 @@ static void riscv_cpu_reset(DeviceState *dev)
cs->exception_index = EXCP_NONE;
env->load_res = -1;
set_default_nan_mode(1, &env->fp_status);
+#ifdef CONFIG_KVM
+ kvm_riscv_reset_vcpu(cpu);
+#endif
}
static void riscv_cpu_disas_set_info(CPUState *s, disassemble_info *info)
diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index c0a326c843..ad1c90f798 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -233,6 +233,9 @@ struct CPURISCVState {
/* Fields from here on are preserved across CPU reset. */
QEMUTimer *timer; /* Internal timer */
+
+ hwaddr kernel_addr;
+ hwaddr fdt_addr;
};
OBJECT_DECLARE_TYPE(RISCVCPU, RISCVCPUClass,
diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
index 8b206ce99c..6250ca0c7d 100644
--- a/target/riscv/kvm.c
+++ b/target/riscv/kvm.c
@@ -37,6 +37,7 @@
#include "hw/irq.h"
#include "qemu/log.h"
#include "hw/loader.h"
+#include "kvm_riscv.h"
static __u64 kvm_riscv_reg_id(__u64 type, __u64 idx)
{
@@ -439,3 +440,17 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
{
return 0;
}
+
+void kvm_riscv_reset_vcpu(RISCVCPU *cpu)
+{
+ CPURISCVState *env = &cpu->env;
+
+ if (!kvm_enabled()) {
+ return;
+ }
+ env->pc = cpu->env.kernel_addr;
+ env->gpr[10] = kvm_arch_vcpu_id(CPU(cpu)); /* a0 */
+ env->gpr[11] = cpu->env.fdt_addr; /* a1 */
+ env->satp = 0;
+}
+
diff --git a/target/riscv/kvm_riscv.h b/target/riscv/kvm_riscv.h
new file mode 100644
index 0000000000..f38c82bf59
--- /dev/null
+++ b/target/riscv/kvm_riscv.h
@@ -0,0 +1,24 @@
+/*
+ * QEMU KVM support -- RISC-V specific functions.
+ *
+ * Copyright (c) 2020 Huawei Technologies Co., Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2 or later, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>;.
+ */
+
+#ifndef QEMU_KVM_RISCV_H
+#define QEMU_KVM_RISCV_H
+
+void kvm_riscv_reset_vcpu(RISCVCPU *cpu);
+
+#endif
--
2.19.1