Re: [Xen-devel] [PATCH v2 11/18] xen: get memory map from hypervisor for PVH

[Juergen Gross <jgross@xxxxxxxx>]

On 19/10/2018 14:40, Daniel Kiper wrote:
> On Tue, Oct 09, 2018 at 01:03:10PM +0200, Juergen Gross wrote:
>> Retrieve the memory map from the hypervisor and normalize it to contain
>> no overlapping entries and to be sorted by address.
>>
>> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
>> ---
>>  grub-core/kern/i386/xen/pvh.c | 98 
>> +++++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 98 insertions(+)
>>
>> diff --git a/grub-core/kern/i386/xen/pvh.c b/grub-core/kern/i386/xen/pvh.c
>> index c1b1cf8db..b4933b454 100644
>> --- a/grub-core/kern/i386/xen/pvh.c
>> +++ b/grub-core/kern/i386/xen/pvh.c
>> @@ -22,7 +22,16 @@
>>  #include <grub/mm.h>
>>  #include <grub/i386/cpuid.h>
>>  #include <grub/xen.h>
>> +#include <grub/i386/linux.h>
>>  #include <grub/machine/kernel.h>
>> +#include <xen/memory.h>
>> +
>> +struct xen_machine_mmap_entry
>> +{
>> +  grub_uint64_t addr;
>> +  grub_uint64_t len;
>> +  grub_uint32_t type;
>> +} GRUB_PACKED;
> 
> Could not we reuse grub_e820_mmap_entry here?

This is defined only locally in grub-core/mmap/i386/pc/mmap.c

I can move it into an appropriate header and use it here and in mmap.c

> 
>>  grub_uint64_t grub_rsdp_addr;
>>
>> @@ -30,6 +39,8 @@ static struct { char _entry[32]; } hypercall_page[128]
>>    __attribute__ ((aligned (GRUB_XEN_PAGE_SIZE)));
>>
>>  static grub_uint32_t xen_cpuid_base;
>> +static struct xen_machine_mmap_entry map[128];
> 
> A constant instead of 128? If no why 128?

I can use a macro instead.

> 
>> +static unsigned int nr_map_entries;
>>
>>  static void
>>  grub_xen_early_halt (void)
>> @@ -93,11 +104,98 @@ grub_xen_hypercall (grub_uint32_t callno, grub_uint32_t 
>> a0,
>>    return __res;
>>  }
>>
>> +static void
>> +grub_xen_sort_mmap (void)
>> +{
>> +  grub_uint64_t from, to;
>> +  unsigned int i;
>> +  struct xen_machine_mmap_entry tmp;
>> +
>> +  /* Align map entries to page boundaries. */
>> +  for (i = 0; i < nr_map_entries; i++)
>> +    {
>> +      from = map[i].addr;
>> +      to = from + map[i].len;
>> +      if (map[i].type == GRUB_MEMORY_AVAILABLE)
>> +    {
>> +      from = ALIGN_UP(from, GRUB_XEN_PAGE_SIZE);
> 
> Lack of space between macro name and "(".
> Here and below...

Okay.

> 
>> +      to = ALIGN_DOWN(to, GRUB_XEN_PAGE_SIZE);
>> +    }
>> +      else
>> +    {
>> +      from = ALIGN_DOWN(from, GRUB_XEN_PAGE_SIZE);
>> +      to = ALIGN_UP(to, GRUB_XEN_PAGE_SIZE);
>> +    }
>> +      map[i].addr = from;
>> +      map[i].len = to - from;
>> +    }


Juergen

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