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Re: [Xen-devel] [PATCH v2 12/18] xen: setup Xen specific data for PVH
From: |
Juergen Gross |
Subject: |
Re: [Xen-devel] [PATCH v2 12/18] xen: setup Xen specific data for PVH |
Date: |
Fri, 19 Oct 2018 17:10:41 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 |
On 19/10/2018 14:48, Daniel Kiper wrote:
> On Tue, Oct 09, 2018 at 01:03:11PM +0200, Juergen Gross wrote:
>> Initialize the needed Xen specific data. This is:
>>
>> - the Xen start of day page containing the console and Xenstore ring
>> page PFN and event channel
>> - the grant table
>> - the shared info page
>>
>> Set the RSDP address for the guest from the start_info page passed
>> as boot parameter.
>>
>> Signed-off-by: Juergen Gross <address@hidden>
>> ---
>> grub-core/kern/i386/xen/pvh.c | 107
>> ++++++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 107 insertions(+)
>>
>> diff --git a/grub-core/kern/i386/xen/pvh.c b/grub-core/kern/i386/xen/pvh.c
>> index b4933b454..93ed68245 100644
>> --- a/grub-core/kern/i386/xen/pvh.c
>> +++ b/grub-core/kern/i386/xen/pvh.c
>> @@ -24,6 +24,7 @@
>> #include <grub/xen.h>
>> #include <grub/i386/linux.h>
>> #include <grub/machine/kernel.h>
>> +#include <xen/hvm/params.h>
>> #include <xen/memory.h>
>>
>> struct xen_machine_mmap_entry
>> @@ -39,6 +40,7 @@ static struct { char _entry[32]; } hypercall_page[128]
>> __attribute__ ((aligned (GRUB_XEN_PAGE_SIZE)));
>>
>> static grub_uint32_t xen_cpuid_base;
>> +static struct start_info grub_xen_start_page;
>> static struct xen_machine_mmap_entry map[128];
>> static unsigned int nr_map_entries;
>>
>> @@ -104,6 +106,36 @@ grub_xen_hypercall (grub_uint32_t callno, grub_uint32_t
>> a0,
>> return __res;
>> }
>>
>> +static grub_uint32_t
>> +grub_xen_get_param (int idx)
>> +{
>> + struct xen_hvm_param xhv;
>> + int r;
>> +
>> + xhv.domid = DOMID_SELF;
>> + xhv.index = idx;
>> + r = grub_xen_hypercall (__HYPERVISOR_hvm_op, HVMOP_get_param,
>> + (grub_uint32_t) (&xhv), 0, 0, 0, 0);
>
> s/(grub_uint32_t) (&xhv)/(grub_uint32_t)(&xhv)/
> Here and in the other patches...
Oh, I have seen lots of places where casts are followed by a blank. I
thought this would be the preferred style.
>
>> + if (r < 0)
>> + grub_xen_early_halt ();
>> + return xhv.value;
>> +}
>> +
>> +static void *
>> +grub_xen_add_physmap (unsigned int space, void *addr)
>> +{
>> + struct xen_add_to_physmap xatp;
>> +
>> + xatp.domid = DOMID_SELF;
>> + xatp.idx = 0;
>> + xatp.space = space;
>> + xatp.gpfn = (grub_addr_t) addr >> GRUB_XEN_LOG_PAGE_SIZE;
>> + if (grub_xen_hypercall (__HYPERVISOR_memory_op, XENMEM_add_to_physmap,
>> + (grub_uint32_t) (&xatp), 0, 0, 0, 0))
>> + grub_xen_early_halt ();
>> + return addr;
>> +}
>> +
>> static void
>> grub_xen_sort_mmap (void)
>> {
>> @@ -190,12 +222,87 @@ grub_xen_get_mmap (void)
>> grub_xen_sort_mmap ();
>> }
>>
>> +static grub_uint64_t
>> +grub_xen_find_page (grub_uint64_t start)
>> +{
>> + unsigned int i, j;
>> + grub_uint64_t last = start;
>> +
>> + /* Try to find a e820 map hole below 4G. */
>> + for (i = 0; i < nr_map_entries; i++)
>> + {
>> + if (last > map[i].addr + map[i].len)
>> + continue;
>> + if (last < map[i].addr)
>> + return last;
>> + if ((map[i].addr >> 32) || ((map[i].addr + map[i].len) >> 32))
>> + break;
>> + last = map[i].addr + map[i].len;
>> + }
>> + if (i == nr_map_entries)
>> + return last;
>> +
>> + /* No hole found, use the highest RAM page below 4G and reserve it. */
>
> It seems to me that this comment should be put before next for().
Hmm, that's a matter of taste, I think. The comment is at the point
where the "no hole found" case is started to be handled. I can move
it down, of course.
>
>> + if (nr_map_entries == ARRAY_SIZE(map))
>> + grub_xen_early_halt ();
>> + j = 0;
>> + for (i = 0; i < nr_map_entries; i++)
>
> for (i = 0, j = 0; i < nr_map_entries; i++)
Okay.
Juergen
- Re: [Xen-devel] [PATCH v2 09/18] xen: add PVH boot entry code, (continued)
- [PATCH v2 14/18] xenpvh: add build runes for grub-core, Juergen Gross, 2018/10/09
- [PATCH v2 12/18] xen: setup Xen specific data for PVH, Juergen Gross, 2018/10/09
- Re: [Xen-devel] [PATCH v2 12/18] xen: setup Xen specific data for PVH, Roger Pau Monné, 2018/10/19
- Re: [Xen-devel] [PATCH v2 12/18] xen: setup Xen specific data for PVH, Roger Pau Monné, 2018/10/19
- Re: [Xen-devel] [PATCH v2 12/18] xen: setup Xen specific data for PVH, Juergen Gross, 2018/10/19
- Re: [Xen-devel] [PATCH v2 12/18] xen: setup Xen specific data for PVH, Roger Pau Monné, 2018/10/29
- Re: [Xen-devel] [PATCH v2 12/18] xen: setup Xen specific data for PVH, Juergen Gross, 2018/10/29
- Re: [Xen-devel] [PATCH v2 12/18] xen: setup Xen specific data for PVH, Roger Pau Monné, 2018/10/30
- Re: [Xen-devel] [PATCH v2 12/18] xen: setup Xen specific data for PVH, Juergen Gross, 2018/10/30
[PATCH v2 18/18] xenpvh: add support to configure, Juergen Gross, 2018/10/09