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Commit 940713bb authored by Konrad Rzeszutek Wilk's avatar Konrad Rzeszutek Wilk
Browse files

xen/p2m: An early bootup variant of set_phys_to_machine 



During early bootup we can't use alloc_page, so to allocate
leaf pages in the P2M we need to use extend_brk. For that
we are utilizing the early_alloc_p2m and early_alloc_p2m_middle
functions to do the job for us. This function follows the
same logic as set_phys_to_machine.

Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent d5096850

arch/x86/include/asm/xen/page.h

+1 −0
Original line number Diff line number Diff line
@@ -44,6 +44,7 @@ extern unsigned long machine_to_phys_nr; 


extern unsigned long get_phys_to_machine(unsigned long pfn);

extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn);

extern bool __init early_set_phys_to_machine(unsigned long pfn, unsigned long mfn);

extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);

extern unsigned long set_phys_range_identity(unsigned long pfn_s,

					     unsigned long pfn_e);

arch/x86/xen/p2m.c

+15 −0
Original line number Diff line number Diff line
@@ -570,6 +570,21 @@ static bool __init early_alloc_p2m(unsigned long pfn) 
	}

	return true;

}

bool __init early_set_phys_to_machine(unsigned long pfn, unsigned long mfn)

{

	if (unlikely(!__set_phys_to_machine(pfn, mfn)))  {

		if (!early_alloc_p2m(pfn))

			return false;



		if (!early_alloc_p2m_middle(pfn, false /* boundary crossover OK!*/))

			return false;



		if (!__set_phys_to_machine(pfn, mfn))

			return false;

	}



	return true;

}

unsigned long __init set_phys_range_identity(unsigned long pfn_s,

				      unsigned long pfn_e)

{