[PATCH v3 06/12] target/riscv: Support start kernel directly by KVM
Jiangyifei
jiangyifei at huawei.com
Sun Jan 9 17:28:35 PST 2022
> -----Original Message-----
> From: Anup Patel [mailto:anup at brainfault.org]
> Sent: Thursday, December 23, 2021 2:04 PM
> To: Jiangyifei <jiangyifei at huawei.com>
> Cc: QEMU Developers <qemu-devel at nongnu.org>; open list:RISC-V
> <qemu-riscv at nongnu.org>; kvm-riscv at lists.infradead.org; KVM General
> <kvm at vger.kernel.org>; libvir-list at redhat.com; Anup Patel
> <anup.patel at wdc.com>; Palmer Dabbelt <palmer at dabbelt.com>; Alistair
> Francis <Alistair.Francis at wdc.com>; Bin Meng <bin.meng at windriver.com>;
> Fanliang (EulerOS) <fanliang at huawei.com>; Wubin (H)
> <wu.wubin at huawei.com>; Wanghaibin (D) <wanghaibin.wang at huawei.com>;
> wanbo (G) <wanbo13 at huawei.com>; limingwang (A)
> <limingwang at huawei.com>
> Subject: Re: [PATCH v3 06/12] target/riscv: Support start kernel directly by KVM
>
> On Thu, Dec 23, 2021 at 11:33 AM Anup Patel <anup at brainfault.org> wrote:
> >
> > On Mon, Dec 20, 2021 at 6:39 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. Add kvm_riscv.h to place riscv specific interface.
> > >
> > > In addition, PLIC is created without M-mode PLIC contexts when KVM
> > > is enabled.
> > >
> > > 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/intc/sifive_plic.c | 8 +++-
> > > hw/riscv/boot.c | 16 +++++++-
> > > hw/riscv/virt.c | 87
> ++++++++++++++++++++++++++++------------
> > > 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 +-
> > > 10 files changed, 159 insertions(+), 29 deletions(-) create mode
> > > 100644 target/riscv/kvm-stub.c create mode 100644
> > > target/riscv/kvm_riscv.h
> > >
> > > diff --git a/hw/intc/sifive_plic.c b/hw/intc/sifive_plic.c index
> > > 877e76877c..1b2b4cc25e 100644
> > > --- a/hw/intc/sifive_plic.c
> > > +++ b/hw/intc/sifive_plic.c
> > > @@ -30,6 +30,7 @@
> > > #include "target/riscv/cpu.h"
> > > #include "migration/vmstate.h"
> > > #include "hw/irq.h"
> > > +#include "sysemu/kvm.h"
> > >
> > > #define RISCV_DEBUG_PLIC 0
> > >
> > > @@ -555,8 +556,11 @@ DeviceState *sifive_plic_create(hwaddr addr,
> > > char *hart_config,
> > >
> > > qdev_connect_gpio_out(dev, i,
> > > qdev_get_gpio_in(DEVICE(cpu),
> IRQ_S_EXT));
> > > - qdev_connect_gpio_out(dev, num_harts + i,
> > > - qdev_get_gpio_in(DEVICE(cpu),
> IRQ_M_EXT));
> > > +
> > > + if (!kvm_enabled()) {
> > > + qdev_connect_gpio_out(dev, num_harts + i,
> > > + qdev_get_gpio_in(DEVICE(cpu),
> IRQ_M_EXT));
> > > + }
> >
> > We should have any KVM enabled check in interrupt controller emulators
> > instead I suggest to re-write the for-loop in sifive_plic_create() as follows:
>
> Typo correction:
> *"We should not have any KVM enabled check in ...."
>
> Regards,
> Anup
>
> >
> > SiFivePLICState *plic;
> >
> > (....)
> >
> > plic = SIFIVE_PLIC(dev);
> > for (i = 0; i < plic->num_addrs; i++) {
> > CPUState *cpu = qemu_get_cpu(plic->addr_config[i].hartid);
> >
> > if (plic->addr_mode[i] == PLICMode_S) {
> > qdev_connect_gpio_out(dev, i,
> > qdev_get_gpio_in(DEVICE(cpu), IRQ_S_EXT));
> > }
> > if (plic->addr_mode[i] == PLICMode_M) {
> > qdev_connect_gpio_out(dev, num_harts + i,
> > qdev_get_gpio_in(DEVICE(cpu), IRQ_M_EXT));
> > }
> > }
> >
Yes, this looks better. It will be re-write in the next series as suggested.
> > > }
> > >
> > > return dev;
> > > diff --git a/hw/riscv/boot.c b/hw/riscv/boot.c index
> > > 519fa455a1..ccff662d89 100644
> > > --- a/hw/riscv/boot.c
> > > +++ b/hw/riscv/boot.c
> > > @@ -30,6 +30,7 @@
> > > #include "elf.h"
> > > #include "sysemu/device_tree.h"
> > > #include "sysemu/qtest.h"
> > > +#include "sysemu/kvm.h"
> > >
> > > #include <libfdt.h>
> > >
> > > @@ -51,7 +52,9 @@ char *riscv_plic_hart_config_string(int hart_count)
> > > CPUState *cs = qemu_get_cpu(i);
> > > CPURISCVState *env = &RISCV_CPU(cs)->env;
> > >
> > > - if (riscv_has_ext(env, RVS)) {
> > > + if (kvm_enabled()) {
> > > + vals[i] = "S";
> > > + } else if (riscv_has_ext(env, RVS)) {
> > > vals[i] = "MS";
> > > } else {
> > > vals[i] = "M";
> > > @@ -317,3 +320,14 @@ 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..cc1a03f284 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"
> > > @@ -50,7 +51,11 @@ static const MemMapEntry virt_memmap[] = {
> > > [VIRT_CLINT] = { 0x2000000, 0x10000 },
> > > [VIRT_ACLINT_SSWI] = { 0x2F00000, 0x4000 },
> > > [VIRT_PCIE_PIO] = { 0x3000000, 0x10000 },
> > > +#if defined(CONFIG_KVM)
> > > + [VIRT_PLIC] = { 0xc000000,
> VIRT_PLIC_SIZE(VIRT_CPUS_MAX * 1) },
> > > +#else
> > > [VIRT_PLIC] = { 0xc000000,
> VIRT_PLIC_SIZE(VIRT_CPUS_MAX * 2) },
> > > +#endif
> >
> > Please drop this change because the same QEMU binary should be usable
> > with and without KVM enabled.
> >
It will be dropped in the next series.
Yifei
> > > [VIRT_UART0] = { 0x10000000, 0x100 },
> > > [VIRT_VIRTIO] = { 0x10001000, 0x1000 },
> > > [VIRT_FW_CFG] = { 0x10100000, 0x18 },
> > > @@ -372,13 +377,22 @@ static void
> create_fdt_socket_plic(RISCVVirtState *s,
> > > "sifive,plic-1.0.0", "riscv,plic0"
> > > };
> > >
> > > - plic_cells = g_new0(uint32_t, s->soc[socket].num_harts * 4);
> > > + if (kvm_enabled()) {
> > > + plic_cells = g_new0(uint32_t, s->soc[socket].num_harts * 2);
> > > + } else {
> > > + plic_cells = g_new0(uint32_t, s->soc[socket].num_harts * 4);
> > > + }
> > >
> > > for (cpu = 0; cpu < s->soc[socket].num_harts; cpu++) {
> > > - plic_cells[cpu * 4 + 0] = cpu_to_be32(intc_phandles[cpu]);
> > > - plic_cells[cpu * 4 + 1] = cpu_to_be32(IRQ_M_EXT);
> > > - plic_cells[cpu * 4 + 2] = cpu_to_be32(intc_phandles[cpu]);
> > > - plic_cells[cpu * 4 + 3] = cpu_to_be32(IRQ_S_EXT);
> > > + if (kvm_enabled()) {
> > > + plic_cells[cpu * 2 + 0] = cpu_to_be32(intc_phandles[cpu]);
> > > + plic_cells[cpu * 2 + 1] = cpu_to_be32(IRQ_S_EXT);
> > > + } else {
> > > + plic_cells[cpu * 4 + 0] = cpu_to_be32(intc_phandles[cpu]);
> > > + plic_cells[cpu * 4 + 1] = cpu_to_be32(IRQ_M_EXT);
> > > + plic_cells[cpu * 4 + 2] = cpu_to_be32(intc_phandles[cpu]);
> > > + plic_cells[cpu * 4 + 3] = cpu_to_be32(IRQ_S_EXT);
> > > + }
> > > }
> > >
> > > plic_phandles[socket] = (*phandle)++; @@ -436,10 +450,12 @@
> > > static void create_fdt_sockets(RISCVVirtState *s, const MemMapEntry
> > > *memmap,
> > >
> > > create_fdt_socket_memory(s, memmap, socket);
> > >
> > > - if (s->have_aclint) {
> > > - create_fdt_socket_aclint(s, memmap, socket,
> intc_phandles);
> > > - } else {
> > > - create_fdt_socket_clint(s, memmap, socket,
> intc_phandles);
> > > + if (!kvm_enabled()) {
> > > + if (s->have_aclint) {
> > > + create_fdt_socket_aclint(s, memmap, socket,
> intc_phandles);
> > > + } else {
> > > + create_fdt_socket_clint(s, memmap, socket,
> intc_phandles);
> > > + }
> > > }
> > >
> > > create_fdt_socket_plic(s, memmap, socket, phandle, @@
> > > -801,23 +817,25 @@ 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);
> > > + }
> > > }
> > >
> > > /* Per-socket PLIC hart topology configuration string */ @@
> > > -884,6 +902,16 @@ 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 +969,15 @@ 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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