linux-kernel - [RFC 23/23] arm/xen: Add support for 64KB page granularity

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Date:	Thu, 14 May 2015 18:01:03 +0100
From:	Julien Grall <julien.grall@...rix.com>
To:	<xen-devel@...ts.xenproject.org>
CC:	<linux-arm-kernel@...ts.infradead.org>, <ian.campbell@...rix.com>,
	<stefano.stabellini@...citrix.com>, <linux-kernel@...r.kernel.org>,
	<tim@....org>, Julien Grall <julien.grall@...rix.com>,
	Russell King <linux@....linux.org.uk>
Subject: [RFC 23/23] arm/xen: Add support for 64KB page granularity

The hypercall interface is always using 4KB page granularity. This is
requiring to use xen page definition macro when we deal with hypercall.

Note that pfn_to_mfn is working with a Xen pfn (i.e 4KB). We may want to
rename pfn_mfn to make this explicit.

We also allocate a 64KB page for the shared page even though only the
first 4KB is used. I don't think this is really important for now as it
helps to have the pointer 4KB aligned (XENMEM_add_to_physmap is taking a
Xen PFN).

Signed-off-by: Julien Grall <julien.grall@...rix.com>
Cc: Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc: Russell King <linux@....linux.org.uk>
---
 arch/arm/include/asm/xen/page.h | 12 ++++++------
 arch/arm/xen/enlighten.c        |  6 +++---
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/arch/arm/include/asm/xen/page.h b/arch/arm/include/asm/xen/page.h
index 1bee8ca..ab6eb9a 100644
--- a/arch/arm/include/asm/xen/page.h
+++ b/arch/arm/include/asm/xen/page.h
@@ -56,19 +56,19 @@ static inline unsigned long mfn_to_pfn(unsigned long mfn)
 
 static inline xmaddr_t phys_to_machine(xpaddr_t phys)
 {
-	unsigned offset = phys.paddr & ~PAGE_MASK;
-	return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
+	unsigned offset = phys.paddr & ~XEN_PAGE_MASK;
+	return XMADDR(XEN_PFN_PHYS(pfn_to_mfn(XEN_PFN_DOWN(phys.paddr))) | offset);
 }
 
 static inline xpaddr_t machine_to_phys(xmaddr_t machine)
 {
-	unsigned offset = machine.maddr & ~PAGE_MASK;
-	return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
+	unsigned offset = machine.maddr & ~XEN_PAGE_MASK;
+	return XPADDR(XEN_PFN_PHYS(mfn_to_pfn(XEN_PFN_DOWN(machine.maddr))) | offset);
 }
 /* VIRT <-> MACHINE conversion */
 #define virt_to_machine(v)	(phys_to_machine(XPADDR(__pa(v))))
-#define virt_to_mfn(v)		(pfn_to_mfn(virt_to_pfn(v)))
-#define mfn_to_virt(m)		(__va(mfn_to_pfn(m) << PAGE_SHIFT))
+#define virt_to_mfn(v)		(pfn_to_mfn(virt_to_phys(v) >> XEN_PAGE_SHIFT))
+#define mfn_to_virt(m)		(__va(mfn_to_pfn(m) << XEN_PAGE_SHIFT))
 
 static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
 {
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 224081c..dcfe251 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -93,8 +93,8 @@ static void xen_percpu_init(void)
 	pr_info("Xen: initializing cpu%d\n", cpu);
 	vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
 
-	info.mfn = __pa(vcpup) >> PAGE_SHIFT;
-	info.offset = offset_in_page(vcpup);
+	info.mfn = __pa(vcpup) >> XEN_PAGE_SHIFT;
+	info.offset = xen_offset_in_page(vcpup);
 
 	err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
 	BUG_ON(err);
@@ -204,7 +204,7 @@ static int __init xen_guest_init(void)
 	xatp.domid = DOMID_SELF;
 	xatp.idx = 0;
 	xatp.space = XENMAPSPACE_shared_info;
-	xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
+	xatp.gpfn = __pa(shared_info_page) >> XEN_PAGE_SHIFT;
 	if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
 		BUG();
 
-- 
2.1.4

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