[PATCH 3.4 81/88] xen/p2m: An early bootup variant of set_phys_to_machine

Greg Kroah-Hartman
2014-06-10T00:22:39Z

From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

commit 940713bb2ce3033f468a220094a07250a2f69bdd upstream.

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: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/x86/include/asm/xen/page.h | 1 +
arch/x86/xen/p2m.c | 15 +++++++++++++++
2 files changed, 16 insertions(+)

--- a/arch/x86/include/asm/xen/page.h
+++ b/arch/x86/include/asm/xen/page.h
@@ -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);
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -570,6 +570,21 @@ static bool __init early_alloc_p2m(unsig
}
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)
{