Re: [PATCH v2 1/4] xen/arm: Move dom0 creation in domain_build.c

[Luca Fancellu <luca.fancellu@xxxxxxx>]

> On 9 Apr 2021, at 09:30, Julien Grall <julien@xxxxxxx> wrote:
> 
> Hi Luca,
> 
> On 08/04/2021 10:48, Luca Fancellu wrote:
>> Move dom0 creation and start from setup.c to domain_build.c
>> on a dedicate function.
>> Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
>> ---
>>  xen/arch/arm/domain_build.c | 36 ++++++++++++++++++++++++++++++++++++
>>  xen/arch/arm/setup.c        | 29 +----------------------------
>>  xen/include/asm-arm/setup.h |  1 +
>>  3 files changed, 38 insertions(+), 28 deletions(-)
>> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
>> index 374bf655ee..d7c9c7f4d1 100644
>> --- a/xen/arch/arm/domain_build.c
>> +++ b/xen/arch/arm/domain_build.c
>> @@ -21,6 +21,7 @@
>>  #include <asm/device.h>
>>  #include <asm/kernel.h>
>>  #include <asm/setup.h>
>> +#include <asm/tee/tee.h>
>>  #include <asm/platform.h>
>>  #include <asm/psci.h>
>>  #include <asm/setup.h>
>> @@ -2520,6 +2521,41 @@ void __init create_domUs(void)
>>      }
>>  }
>>  +struct domain* __init create_dom0(void)
>> +{
>> +    struct domain *dom0;
>> +    struct xen_domctl_createdomain dom0_cfg = {
>> +        .flags = XEN_DOMCTL_CDF_hvm | XEN_DOMCTL_CDF_hap,
>> +        .max_evtchn_port = -1,
>> +        .max_grant_frames = gnttab_dom0_frames(),
>> +        .max_maptrack_frames = -1,
>> +    };
>> +
>> +    /* The vGIC for DOM0 is exactly emulating the hardware GIC */
>> +    dom0_cfg.arch.gic_version = XEN_DOMCTL_CONFIG_GIC_NATIVE;
>> +    /*
>> +     * Xen vGIC supports a maximum of 992 interrupt lines.
>> +     * 32 are substracted to cover local IRQs.
>> +     */
>> +    dom0_cfg.arch.nr_spis = min(gic_number_lines(), (unsigned int) 992) - 
>> 32;
>> +    if ( gic_number_lines() > 992 )
>> +        printk(XENLOG_WARNING "Maximum number of vGIC IRQs exceeded.\n");
>> +    dom0_cfg.arch.tee_type = tee_get_type();
>> +    dom0_cfg.max_vcpus = dom0_max_vcpus();
>> +
>> +    if ( iommu_enabled )
>> +        dom0_cfg.flags |= XEN_DOMCTL_CDF_iommu;
>> +
>> +    dom0 = domain_create(0, &dom0_cfg, true);
>> +    if ( IS_ERR(dom0) || (alloc_dom0_vcpu0(dom0) == NULL) )
>> +        panic("Error creating domain 0\n");
>> +
>> +    if ( construct_dom0(dom0) != 0)
>> +        panic("Could not set up DOM0 guest OS\n");
>> +
>> +    return dom0;
>> +}
>> +
> 
> I would move the function after...
> 
>>  int __init construct_dom0(struct domain *d)
> 
> ... this function so we can mark construct_dom0() static as create_dom0() is 
> the only caller.

Yes, I’ll modify it in the v3.

Cheers,
Luca

> 
>>  {
>>      struct kernel_info kinfo = {};
>> diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
>> index 2532ec9739..b405f58996 100644
>> --- a/xen/arch/arm/setup.c
>> +++ b/xen/arch/arm/setup.c
>> @@ -51,7 +51,6 @@
>>  #include <asm/platform.h>
>>  #include <asm/procinfo.h>
>>  #include <asm/setup.h>
>> -#include <asm/tee/tee.h>
>>  #include <xsm/xsm.h>
>>  #include <asm/acpi.h>
>>  @@ -805,12 +804,6 @@ void __init start_xen(unsigned long boot_phys_offset,
>>      const char *cmdline;
>>      struct bootmodule *xen_bootmodule;
>>      struct domain *dom0;
>> -    struct xen_domctl_createdomain dom0_cfg = {
>> -        .flags = XEN_DOMCTL_CDF_hvm | XEN_DOMCTL_CDF_hap,
>> -        .max_evtchn_port = -1,
>> -        .max_grant_frames = gnttab_dom0_frames(),
>> -        .max_maptrack_frames = -1,
>> -    };
>>      int rc;
>>        dcache_line_bytes = read_dcache_line_bytes();
>> @@ -965,27 +958,7 @@ void __init start_xen(unsigned long boot_phys_offset,
>>      enable_errata_workarounds();
>>        /* Create initial domain 0. */
>> -    /* The vGIC for DOM0 is exactly emulating the hardware GIC */
>> -    dom0_cfg.arch.gic_version = XEN_DOMCTL_CONFIG_GIC_NATIVE;
>> -    /*
>> -     * Xen vGIC supports a maximum of 992 interrupt lines.
>> -     * 32 are substracted to cover local IRQs.
>> -     */
>> -    dom0_cfg.arch.nr_spis = min(gic_number_lines(), (unsigned int) 992) - 
>> 32;
>> -    if ( gic_number_lines() > 992 )
>> -        printk(XENLOG_WARNING "Maximum number of vGIC IRQs exceeded.\n");
>> -    dom0_cfg.arch.tee_type = tee_get_type();
>> -    dom0_cfg.max_vcpus = dom0_max_vcpus();
>> -
>> -    if ( iommu_enabled )
>> -        dom0_cfg.flags |= XEN_DOMCTL_CDF_iommu;
>> -
>> -    dom0 = domain_create(0, &dom0_cfg, true);
>> -    if ( IS_ERR(dom0) || (alloc_dom0_vcpu0(dom0) == NULL) )
>> -        panic("Error creating domain 0\n");
>> -
>> -    if ( construct_dom0(dom0) != 0)
>> -        panic("Could not set up DOM0 guest OS\n");
>> +    dom0 = create_dom0();
>>        heap_init_late();
>>  diff --git a/xen/include/asm-arm/setup.h b/xen/include/asm-arm/setup.h
>> index 28bf622aa1..e5f5c7ebc6 100644
>> --- a/xen/include/asm-arm/setup.h
>> +++ b/xen/include/asm-arm/setup.h
>> @@ -95,6 +95,7 @@ int acpi_make_efi_nodes(void *fdt, struct membank 
>> tbl_add[]);
>>    int construct_dom0(struct domain *d);
>>  void create_domUs(void);
>> +struct domain* create_dom0(void);
>>    void discard_initial_modules(void);
>>  void fw_unreserved_regions(paddr_t s, paddr_t e,
> 
> Cheers,
> 
> -- 
> Julien Grall