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xen/mmu/p2m: Refactor the xen_pagetable_init code (v2).

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The revectoring and copying of the P2M only happens when
!auto-xlat and on 64-bit builds. It is not obvious from
the code, so lets have seperate 32 and 64-bit functions.

We also invert the check for auto-xlat to make the code
flow simpler.

Suggested-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2013-12-31 12:37:52 -05:00
parent 696fd7c5b2
commit 32df75cd14
1 changed files with 37 additions and 33 deletions
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70
arch/x86/xen/mmu.c
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@ -1198,44 +1198,40 @@ static void __init xen_cleanhighmap(unsigned long vaddr,
* instead of somewhere later and be confusing. */
xen_mc_flush();
}
#endif
static void __init xen_pagetable_init(void)
static void __init xen_pagetable_p2m_copy(void)
{
#ifdef CONFIG_X86_64
unsigned long size;
unsigned long addr;
#endif
paging_init();
xen_setup_shared_info();
#ifdef CONFIG_X86_64
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
unsigned long new_mfn_list;
unsigned long new_mfn_list;
if (xen_feature(XENFEAT_auto_translated_physmap))
return;
size = PAGE_ALIGN(xen_start_info->nr_pages * sizeof(unsigned long));
/* On 32-bit, we get zero so this never gets executed. */
new_mfn_list = xen_revector_p2m_tree();
if (new_mfn_list && new_mfn_list != xen_start_info->mfn_list) {
/* using __ka address and sticking INVALID_P2M_ENTRY! */
memset((void *)xen_start_info->mfn_list, 0xff, size);
/* We should be in __ka space. */
BUG_ON(xen_start_info->mfn_list < __START_KERNEL_map);
addr = xen_start_info->mfn_list;
/* We roundup to the PMD, which means that if anybody at this stage is
* using the __ka address of xen_start_info or xen_start_info->shared_info
* they are in going to crash. Fortunatly we have already revectored
* in xen_setup_kernel_pagetable and in xen_setup_shared_info. */
size = roundup(size, PMD_SIZE);
xen_cleanhighmap(addr, addr + size);
size = PAGE_ALIGN(xen_start_info->nr_pages * sizeof(unsigned long));
memblock_free(__pa(xen_start_info->mfn_list), size);
/* And revector! Bye bye old array */
xen_start_info->mfn_list = new_mfn_list;
} else
return;
/* On 32-bit, we get zero so this never gets executed. */
new_mfn_list = xen_revector_p2m_tree();
if (new_mfn_list && new_mfn_list != xen_start_info->mfn_list) {
/* using __ka address and sticking INVALID_P2M_ENTRY! */
memset((void *)xen_start_info->mfn_list, 0xff, size);
/* We should be in __ka space. */
BUG_ON(xen_start_info->mfn_list < __START_KERNEL_map);
addr = xen_start_info->mfn_list;
/* We roundup to the PMD, which means that if anybody at this stage is
* using the __ka address of xen_start_info or xen_start_info->shared_info
* they are in going to crash. Fortunatly we have already revectored
* in xen_setup_kernel_pagetable and in xen_setup_shared_info. */
size = roundup(size, PMD_SIZE);
xen_cleanhighmap(addr, addr + size);
size = PAGE_ALIGN(xen_start_info->nr_pages * sizeof(unsigned long));
memblock_free(__pa(xen_start_info->mfn_list), size);
/* And revector! Bye bye old array */
xen_start_info->mfn_list = new_mfn_list;
} else
goto skip;
}
/* At this stage, cleanup_highmap has already cleaned __ka space
* from _brk_limit way up to the max_pfn_mapped (which is the end of
* the ramdisk). We continue on, erasing PMD entries that point to page
@ -1255,7 +1251,15 @@ static void __init xen_pagetable_init(void)
* anything at this stage. */
xen_cleanhighmap(MODULES_VADDR, roundup(MODULES_VADDR, PUD_SIZE) - 1);
#endif
skip:
}
#endif
static void __init xen_pagetable_init(void)
{
paging_init();
xen_setup_shared_info();
#ifdef CONFIG_X86_64
xen_pagetable_p2m_copy();
#endif
xen_post_allocator_init();
}