Re: [Xen-devel] [PATCH 8/8] x86/setup: lift dom0 creation out into create_dom0() function

[Jan Beulich <jbeulich@suse.com>]

On 01.02.2020 01:33, David Woodhouse wrote:
> --- a/xen/arch/x86/setup.c
> +++ b/xen/arch/x86/setup.c
> @@ -678,6 +678,92 @@ static unsigned int __init copy_bios_e820(struct e820entry *map, unsigned int li
>      return n;
>  }
>  
> +static struct domain * __init create_dom0(const module_t *image,
> +                                          unsigned long headroom,
> +                                          module_t *initrd, char *kextra,
> +                                          char *loader)

Can any of these last three be pointer-to-const?

> +{
> +    struct xen_domctl_createdomain dom0_cfg = {
> +        .flags = IS_ENABLED(CONFIG_TBOOT) ? XEN_DOMCTL_CDF_s3_integrity : 0,
> +        .max_evtchn_port = -1,
> +        .max_grant_frames = -1,
> +        .max_maptrack_frames = -1,
> +    };
> +    struct domain *d;
> +    char *cmdline;
> +
> +    if ( opt_dom0_pvh )
> +    {
> +        dom0_cfg.flags |= (XEN_DOMCTL_CDF_hvm |
> +                           ((hvm_hap_supported() && !opt_dom0_shadow) ?
> +                            XEN_DOMCTL_CDF_hap : 0));
> +
> +        dom0_cfg.arch.emulation_flags |=
> +            XEN_X86_EMU_LAPIC | XEN_X86_EMU_IOAPIC | XEN_X86_EMU_VPCI;
> +    }
> +    dom0_cfg.max_vcpus = dom0_max_vcpus();

Can this not be part of the initializer now?

> +    if ( iommu_enabled )
> +        dom0_cfg.flags |= XEN_DOMCTL_CDF_iommu;
> +
> +    /* Create initial domain 0. */
> +    d = domain_create(get_initial_domain_id(), &dom0_cfg, !pv_shim);
> +    if ( IS_ERR(d) || (alloc_dom0_vcpu0(d) == NULL) )
> +        panic("Error creating domain 0\n");
> +
> +    /* Grab the DOM0 command line. */
> +    cmdline = (char *)(image->string ? __va(image->string) : NULL);

Is this cast needed? (I know you're only moving the code, but some
easy cleanup would be nice anyway.)

> +    if ( (cmdline != NULL) || (kextra != NULL) )

Similarly here you may want to consider shortening to

    if ( cmdline || kextra )

At least one more similar case further down.

Jan

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