Re: [PATCH v7 2/3] riscv/virt: Support using pflash via -blockdev option

[Alistair Francis <alistair23@gmail.com>]

On Thu, Jun 1, 2023 at 3:01 PM Sunil V L <sunilvl@ventanamicro.com> wrote:
>
> Currently, pflash devices can be configured only via -pflash
> or -drive options. This is the legacy way and the
> better way is to use -blockdev as in other architectures.
> libvirt also has moved to use -blockdev method.
>
> To support -blockdev option, pflash devices need to be
> created in instance_init itself. So, update the code to
> move the virt_flash_create() to instance_init. Also, use
> standard interfaces to detect whether pflash0 is
> configured or not.
>
> Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
> Reported-by: Andrea Bolognani <abologna@redhat.com>
> Tested-by: Andrea Bolognani <abologna@redhat.com>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

> ---
>  hw/riscv/virt.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
> index 3e5dc649c3..76c7a3ba3b 100644
> --- a/hw/riscv/virt.c
> +++ b/hw/riscv/virt.c
> @@ -1246,6 +1246,7 @@ static void virt_machine_done(Notifier *notifier, void *data)
>      const char *firmware_name = riscv_default_firmware_name(&s->soc[0]);
>      uint32_t fdt_load_addr;
>      uint64_t kernel_entry = 0;
> +    BlockBackend *pflash_blk0;
>
>      /*
>       * Only direct boot kernel is currently supported for KVM VM,
> @@ -1266,7 +1267,8 @@ static void virt_machine_done(Notifier *notifier, void *data)
>      firmware_end_addr = riscv_find_and_load_firmware(machine, firmware_name,
>                                                       start_addr, NULL);
>
> -    if (drive_get(IF_PFLASH, 0, 0)) {
> +    pflash_blk0 = pflash_cfi01_get_blk(s->flash[0]);
> +    if (pflash_blk0) {
>          if (machine->firmware && !strcmp(machine->firmware, "none") &&
>              !kvm_enabled()) {
>              /*
> @@ -1499,8 +1501,6 @@ static void virt_machine_init(MachineState *machine)
>      sysbus_create_simple("goldfish_rtc", memmap[VIRT_RTC].base,
>          qdev_get_gpio_in(DEVICE(mmio_irqchip), RTC_IRQ));
>
> -    virt_flash_create(s);
> -
>      for (i = 0; i < ARRAY_SIZE(s->flash); i++) {
>          /* Map legacy -drive if=pflash to machine properties */
>          pflash_cfi01_legacy_drive(s->flash[i],
> @@ -1527,6 +1527,8 @@ static void virt_machine_instance_init(Object *obj)
>  {
>      RISCVVirtState *s = RISCV_VIRT_MACHINE(obj);
>
> +    virt_flash_create(s);
> +
>      s->oem_id = g_strndup(ACPI_BUILD_APPNAME6, 6);
>      s->oem_table_id = g_strndup(ACPI_BUILD_APPNAME8, 8);
>      s->acpi = ON_OFF_AUTO_AUTO;
> --
> 2.34.1
>
>