Re: [PATCH-for-9.1 v2] hw/i386/pc: Ensure vmport prerequisites are fulfilled

[Michael S. Tsirkin]

On Fri, Aug 16, 2024 at 08:01:26AM +0000, Kamil Szczęk wrote:
> Since commit 4ccd5fe22feb95137d325f422016a6473541fe9f ('pc: add option
> to disable PS/2 mouse/keyboard'), the vmport will not be created unless
> the i8042 PS/2 controller is enabled. To avoid confusion, let's fail if
> vmport was explicitly requested, but the i8042 controller is disabled.
> This also changes the behavior of vmport=auto to take i8042 controller
> availability into account.
> 
> Signed-off-by: Kamil Szczęk <kamil@szczek.dev>


tagged, thanks!

> ---
>  hw/i386/pc.c      | 8 ++++++--
>  hw/i386/pc_piix.c | 3 ++-
>  hw/i386/pc_q35.c  | 2 +-
>  qemu-options.hx   | 4 ++--
>  4 files changed, 11 insertions(+), 6 deletions(-)
> 
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index c74931d577..c99f2ce540 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -1075,7 +1075,7 @@ static const MemoryRegionOps ioportF0_io_ops = {
>  };
>  
>  static void pc_superio_init(ISABus *isa_bus, bool create_fdctrl,
> -                            bool create_i8042, bool no_vmport)
> +                            bool create_i8042, bool no_vmport, Error **errp)
>  {
>      int i;
>      DriveInfo *fd[MAX_FD];
> @@ -1100,6 +1100,10 @@ static void pc_superio_init(ISABus *isa_bus, bool 
> create_fdctrl,
>      }
>  
>      if (!create_i8042) {
> +        if (!no_vmport) {
> +            error_setg(errp,
> +                       "vmport requires the i8042 controller to be enabled");
> +        }
>          return;
>      }
>  
> @@ -1219,7 +1223,7 @@ void pc_basic_device_init(struct PCMachineState *pcms,
>  
>      /* Super I/O */
>      pc_superio_init(isa_bus, create_fdctrl, pcms->i8042_enabled,
> -                    pcms->vmport != ON_OFF_AUTO_ON);
> +                    pcms->vmport != ON_OFF_AUTO_ON, &error_fatal);
>  }
>  
>  void pc_nic_init(PCMachineClass *pcmc, ISABus *isa_bus, PCIBus *pci_bus)
> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> index d9e69243b4..cf2e2e3e30 100644
> --- a/hw/i386/pc_piix.c
> +++ b/hw/i386/pc_piix.c
> @@ -312,7 +312,8 @@ static void pc_init1(MachineState *machine, const char 
> *pci_type)
>  
>      assert(pcms->vmport != ON_OFF_AUTO__MAX);
>      if (pcms->vmport == ON_OFF_AUTO_AUTO) {
> -        pcms->vmport = xen_enabled() ? ON_OFF_AUTO_OFF : ON_OFF_AUTO_ON;
> +        pcms->vmport = (xen_enabled() || !pcms->i8042_enabled)
> +            ? ON_OFF_AUTO_OFF : ON_OFF_AUTO_ON;
>      }
>  
>      /* init basic PC hardware */
> diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
> index 9d108b194e..6c112d804d 100644
> --- a/hw/i386/pc_q35.c
> +++ b/hw/i386/pc_q35.c
> @@ -278,7 +278,7 @@ static void pc_q35_init(MachineState *machine)
>  
>      assert(pcms->vmport != ON_OFF_AUTO__MAX);
>      if (pcms->vmport == ON_OFF_AUTO_AUTO) {
> -        pcms->vmport = ON_OFF_AUTO_ON;
> +        pcms->vmport = pcms->i8042_enabled ? ON_OFF_AUTO_ON : 
> ON_OFF_AUTO_OFF;
>      }
>  
>      /* init basic PC hardware */
> diff --git a/qemu-options.hx b/qemu-options.hx
> index cee0da2014..0bc780a669 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -68,8 +68,8 @@ SRST
>  
>      ``vmport=on|off|auto``
>          Enables emulation of VMWare IO port, for vmmouse etc. auto says
> -        to select the value based on accel. For accel=xen the default is
> -        off otherwise the default is on.
> +        to select the value based on accel and i8042. For accel=xen
> +        and/or i8042=off the default is off otherwise the default is on.
>  
>      ``dump-guest-core=on|off``
>          Include guest memory in a core dump. The default is on.
> -- 
> 2.45.0
>