---

yaml
---
r: 136979
b: refs/heads/master
c: 9976b39
h: refs/heads/master
i:
  136977: 9d58018
  136975: 9ba1e99
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d0c4f570276cb4d2dc4215b90eb7cb6e2bdd4a15
+refs/heads/master: 9976b39b5031bbf76f715893cf080b6a17683881

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

@@ -164,6 +164,7 @@ static inline pte_t __pte_ma(pteval_t x)
 
 
 xmaddr_t arbitrary_virt_to_machine(void *address);
+unsigned long arbitrary_virt_to_mfn(void *vaddr);
 void make_lowmem_page_readonly(void *vaddr);
 void make_lowmem_page_readwrite(void *vaddr);
 

trunk/arch/x86/xen/enlighten.c

@@ -103,7 +103,7 @@ static void xen_vcpu_setup(int cpu)
 
 	vcpup = &per_cpu(xen_vcpu_info, cpu);
 
-	info.mfn = virt_to_mfn(vcpup);
+	info.mfn = arbitrary_virt_to_mfn(vcpup);
 	info.offset = offset_in_page(vcpup);
 
 	printk(KERN_DEBUG "trying to map vcpu_info %d at %p, mfn %llx, offset %d\n",
@@ -301,8 +301,10 @@ static void xen_load_gdt(const struct desc_ptr *dtr)
 	frames = mcs.args;
 
 	for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
-		frames[f] = virt_to_mfn(va);
+		frames[f] = arbitrary_virt_to_mfn((void *)va);
+
 		make_lowmem_page_readonly((void *)va);
+		make_lowmem_page_readonly(mfn_to_virt(frames[f]));
 	}
 
 	MULTI_set_gdt(mcs.mc, frames, size / sizeof(struct desc_struct));
@@ -314,7 +316,7 @@ static void load_TLS_descriptor(struct thread_struct *t,
 				unsigned int cpu, unsigned int i)
 {
 	struct desc_struct *gdt = get_cpu_gdt_table(cpu);
-	xmaddr_t maddr = virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]);
+	xmaddr_t maddr = arbitrary_virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]);
 	struct multicall_space mc = __xen_mc_entry(0);
 
 	MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]);
@@ -488,7 +490,7 @@ static void xen_write_gdt_entry(struct desc_struct *dt, int entry,
 		break;
 
 	default: {
-		xmaddr_t maddr = virt_to_machine(&dt[entry]);
+		xmaddr_t maddr = arbitrary_virt_to_machine(&dt[entry]);
 
 		xen_mc_flush();
 		if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc))

trunk/arch/x86/xen/mmu.c

@@ -276,6 +276,13 @@ void set_phys_to_machine(unsigned long pfn, unsigned long mfn)
 	p2m_top[topidx][idx] = mfn;
 }
 
+unsigned long arbitrary_virt_to_mfn(void *vaddr)
+{
+	xmaddr_t maddr = arbitrary_virt_to_machine(vaddr);
+
+	return PFN_DOWN(maddr.maddr);
+}
+
 xmaddr_t arbitrary_virt_to_machine(void *vaddr)
 {
 	unsigned long address = (unsigned long)vaddr;

trunk/arch/x86/xen/smp.c

@@ -219,6 +219,7 @@ cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
 {
 	struct vcpu_guest_context *ctxt;
 	struct desc_struct *gdt;
+	unsigned long gdt_mfn;
 
 	if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
 		return 0;
@@ -248,9 +249,12 @@ cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
 	ctxt->ldt_ents = 0;
 
 	BUG_ON((unsigned long)gdt & ~PAGE_MASK);
+
+	gdt_mfn = arbitrary_virt_to_mfn(gdt);
 	make_lowmem_page_readonly(gdt);
+	make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
 
-	ctxt->gdt_frames[0] = virt_to_mfn(gdt);
+	ctxt->gdt_frames[0] = gdt_mfn;
 	ctxt->gdt_ents      = GDT_ENTRIES;
 
 	ctxt->user_regs.cs = __KERNEL_CS;