[PATCH v2 06/12] target/riscv: Support start kernel directly by KVM
Anup Patel
anup at brainfault.org
Sun Dec 12 20:21:17 PST 2021
On Fri, Dec 10, 2021 at 3:37 PM Yifei Jiang <jiangyifei at huawei.com> wrote:
>
> 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 at huawei.com>
> Signed-off-by: Mingwang Li <limingwang at huawei.com>
> Reviewed-by: Alistair Francis <alistair.francis at wdc.com>
> ---
> hw/riscv/boot.c | 11 ++++++++
> hw/riscv/virt.c | 54 ++++++++++++++++++++++++++++------------
> include/hw/riscv/boot.h | 1 +
> target/riscv/cpu.c | 8 ++++++
> target/riscv/cpu.h | 3 +++
> target/riscv/kvm-stub.c | 25 +++++++++++++++++++
> target/riscv/kvm.c | 14 +++++++++++
> target/riscv/kvm_riscv.h | 24 ++++++++++++++++++
> target/riscv/meson.build | 2 +-
> 9 files changed, 125 insertions(+), 17 deletions(-)
> create mode 100644 target/riscv/kvm-stub.c
> create mode 100644 target/riscv/kvm_riscv.h
>
> diff --git a/hw/riscv/boot.c b/hw/riscv/boot.c
> index 519fa455a1..00df6d7810 100644
> --- a/hw/riscv/boot.c
> +++ b/hw/riscv/boot.c
> @@ -317,3 +317,14 @@ void riscv_setup_rom_reset_vec(MachineState *machine, RISCVHartArrayState *harts
>
> return;
> }
> +
> +void riscv_setup_direct_kernel(hwaddr kernel_addr, hwaddr fdt_addr)
> +{
> + CPUState *cs;
> +
> + for (cs = first_cpu; cs; cs = CPU_NEXT(cs)) {
> + RISCVCPU *riscv_cpu = RISCV_CPU(cs);
> + riscv_cpu->env.kernel_addr = kernel_addr;
> + riscv_cpu->env.fdt_addr = fdt_addr;
> + }
> +}
> diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
> index 3af074148e..c8bcd9d9e5 100644
> --- a/hw/riscv/virt.c
> +++ b/hw/riscv/virt.c
> @@ -38,6 +38,7 @@
> #include "chardev/char.h"
> #include "sysemu/device_tree.h"
> #include "sysemu/sysemu.h"
> +#include "sysemu/kvm.h"
> #include "hw/pci/pci.h"
> #include "hw/pci-host/gpex.h"
> #include "hw/display/ramfb.h"
> @@ -801,23 +802,25 @@ static void virt_machine_init(MachineState *machine)
> hart_count, &error_abort);
> sysbus_realize(SYS_BUS_DEVICE(&s->soc[i]), &error_abort);
>
> - /* Per-socket CLINT */
> - riscv_aclint_swi_create(
> - memmap[VIRT_CLINT].base + i * memmap[VIRT_CLINT].size,
> - base_hartid, hart_count, false);
> - riscv_aclint_mtimer_create(
> - memmap[VIRT_CLINT].base + i * memmap[VIRT_CLINT].size +
> - RISCV_ACLINT_SWI_SIZE,
> - RISCV_ACLINT_DEFAULT_MTIMER_SIZE, base_hartid, hart_count,
> - RISCV_ACLINT_DEFAULT_MTIMECMP, RISCV_ACLINT_DEFAULT_MTIME,
> - RISCV_ACLINT_DEFAULT_TIMEBASE_FREQ, true);
> -
> - /* Per-socket ACLINT SSWI */
> - if (s->have_aclint) {
> + if (!kvm_enabled()) {
> + /* Per-socket CLINT */
> riscv_aclint_swi_create(
> - memmap[VIRT_ACLINT_SSWI].base +
> - i * memmap[VIRT_ACLINT_SSWI].size,
> - base_hartid, hart_count, true);
> + memmap[VIRT_CLINT].base + i * memmap[VIRT_CLINT].size,
> + base_hartid, hart_count, false);
> + riscv_aclint_mtimer_create(
> + memmap[VIRT_CLINT].base + i * memmap[VIRT_CLINT].size +
> + RISCV_ACLINT_SWI_SIZE,
> + RISCV_ACLINT_DEFAULT_MTIMER_SIZE, base_hartid, hart_count,
> + RISCV_ACLINT_DEFAULT_MTIMECMP, RISCV_ACLINT_DEFAULT_MTIME,
> + RISCV_ACLINT_DEFAULT_TIMEBASE_FREQ, true);
> +
> + /* Per-socket ACLINT SSWI */
> + if (s->have_aclint) {
> + riscv_aclint_swi_create(
> + memmap[VIRT_ACLINT_SSWI].base +
> + i * memmap[VIRT_ACLINT_SSWI].size,
> + base_hartid, hart_count, true);
> + }
Along with this, we should not generate FDT nodes of ACLINT (or SiFive CLINT)
when KVM is enabled.
> }
>
> /* Per-socket PLIC hart topology configuration string */
> @@ -884,6 +887,16 @@ static void virt_machine_init(MachineState *machine)
> memory_region_add_subregion(system_memory, memmap[VIRT_MROM].base,
> mask_rom);
>
> + /*
> + * Only direct boot kernel is currently supported for KVM VM,
> + * so the "-bios" parameter is ignored and treated like "-bios none"
> + * when KVM is enabled.
> + */
> + if (kvm_enabled()) {
> + g_free(machine->firmware);
> + machine->firmware = g_strdup("none");
> + }
> +
> if (riscv_is_32bit(&s->soc[0])) {
> firmware_end_addr = riscv_find_and_load_firmware(machine,
> RISCV32_BIOS_BIN, start_addr, NULL);
> @@ -941,6 +954,15 @@ static void virt_machine_init(MachineState *machine)
> virt_memmap[VIRT_MROM].size, kernel_entry,
> fdt_load_addr, machine->fdt);
>
> + /*
> + * Only direct boot kernel is currently supported for KVM VM,
> + * So here setup kernel start address and fdt address.
> + * TODO:Support firmware loading and integrate to TCG start
> + */
> + if (kvm_enabled()) {
> + riscv_setup_direct_kernel(kernel_entry, fdt_load_addr);
> + }
> +
> /* SiFive Test MMIO device */
> sifive_test_create(memmap[VIRT_TEST].base);
>
> diff --git a/include/hw/riscv/boot.h b/include/hw/riscv/boot.h
> index baff11dd8a..5834c234aa 100644
> --- a/include/hw/riscv/boot.h
> +++ b/include/hw/riscv/boot.h
> @@ -58,5 +58,6 @@ void riscv_rom_copy_firmware_info(MachineState *machine, hwaddr rom_base,
> hwaddr rom_size,
> uint32_t reset_vec_size,
> uint64_t kernel_entry);
> +void riscv_setup_direct_kernel(hwaddr kernel_addr, hwaddr fdt_addr);
>
> #endif /* RISCV_BOOT_H */
> diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> index f812998123..1c944872a3 100644
> --- a/target/riscv/cpu.c
> +++ b/target/riscv/cpu.c
> @@ -29,6 +29,8 @@
> #include "hw/qdev-properties.h"
> #include "migration/vmstate.h"
> #include "fpu/softfloat-helpers.h"
> +#include "sysemu/kvm.h"
> +#include "kvm_riscv.h"
>
> /* RISC-V CPU definitions */
>
> @@ -380,6 +382,12 @@ static void riscv_cpu_reset(DeviceState *dev)
> cs->exception_index = RISCV_EXCP_NONE;
> env->load_res = -1;
> set_default_nan_mode(1, &env->fp_status);
> +
> +#ifndef CONFIG_USER_ONLY
> + if (kvm_enabled()) {
> + 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 0760c0af93..2807eb1bcb 100644
> --- a/target/riscv/cpu.h
> +++ b/target/riscv/cpu.h
> @@ -255,6 +255,9 @@ 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-stub.c b/target/riscv/kvm-stub.c
> new file mode 100644
> index 0000000000..39b96fe3f4
> --- /dev/null
> +++ b/target/riscv/kvm-stub.c
> @@ -0,0 +1,25 @@
> +/*
> + * QEMU KVM RISC-V specific function stubs
> + *
> + * 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/>.
> + */
> +#include "qemu/osdep.h"
> +#include "cpu.h"
> +#include "kvm_riscv.h"
> +
> +void kvm_riscv_reset_vcpu(RISCVCPU *cpu)
> +{
> + abort();
> +}
> diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
> index e695b91dc7..db6d8a5b6e 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 uint64_t kvm_riscv_reg_id(CPURISCVState *env, uint64_t type, uint64_t idx)
> {
> @@ -369,6 +370,19 @@ 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;
> +}
> +
> bool kvm_arch_cpu_check_are_resettable(void)
> {
> return true;
> 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
> diff --git a/target/riscv/meson.build b/target/riscv/meson.build
> index 2faf08a941..fe41cc5805 100644
> --- a/target/riscv/meson.build
> +++ b/target/riscv/meson.build
> @@ -19,7 +19,7 @@ riscv_ss.add(files(
> 'bitmanip_helper.c',
> 'translate.c',
> ))
> -riscv_ss.add(when: 'CONFIG_KVM', if_true: files('kvm.c'))
> +riscv_ss.add(when: 'CONFIG_KVM', if_true: files('kvm.c'), if_false: files('kvm-stub.c'))
>
> riscv_softmmu_ss = ss.source_set()
> riscv_softmmu_ss.add(files(
> --
> 2.19.1
>
Regards,
Anup
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