1 files changed, 0 insertions, 567 deletions
diff --git a/arch/i386/xen/mmu.c b/arch/i386/xen/mmu.c
deleted file mode 100644
index 874db0cd1d2a..000000000000
--- a/arch/i386/xen/mmu.c
+++ /dev/null
@@ -1,567 +0,0 @@
-/*
- * Xen mmu operations
- *
- * This file contains the various mmu fetch and update operations.
- * The most important job they must perform is the mapping between the
- * domain's pfn and the overall machine mfns.
- *
- * Xen allows guests to directly update the pagetable, in a controlled
- * fashion.  In other words, the guest modifies the same pagetable
- * that the CPU actually uses, which eliminates the overhead of having
- * a separate shadow pagetable.
- *
- * In order to allow this, it falls on the guest domain to map its
- * notion of a "physical" pfn - which is just a domain-local linear
- * address - into a real "machine address" which the CPU's MMU can
- * use.
- *
- * A pgd_t/pmd_t/pte_t will typically contain an mfn, and so can be
- * inserted directly into the pagetable.  When creating a new
- * pte/pmd/pgd, it converts the passed pfn into an mfn.  Conversely,
- * when reading the content back with __(pgd|pmd|pte)_val, it converts
- * the mfn back into a pfn.
- *
- * The other constraint is that all pages which make up a pagetable
- * must be mapped read-only in the guest.  This prevents uncontrolled
- * guest updates to the pagetable.  Xen strictly enforces this, and
- * will disallow any pagetable update which will end up mapping a
- * pagetable page RW, and will disallow using any writable page as a
- * pagetable.
- *
- * Naively, when loading %cr3 with the base of a new pagetable, Xen
- * would need to validate the whole pagetable before going on.
- * Naturally, this is quite slow.  The solution is to "pin" a
- * pagetable, which enforces all the constraints on the pagetable even
- * when it is not actively in use.  This menas that Xen can be assured
- * that it is still valid when you do load it into %cr3, and doesn't
- * need to revalidate it.
- *
- * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
- */
-#include <linux/sched.h>
-#include <linux/highmem.h>
-#include <linux/bug.h>
-#include <linux/sched.h>
-
-#include <asm/pgtable.h>
-#include <asm/tlbflush.h>
-#include <asm/mmu_context.h>
-#include <asm/paravirt.h>
-
-#include <asm/xen/hypercall.h>
-#include <asm/xen/hypervisor.h>
-
-#include <xen/page.h>
-#include <xen/interface/xen.h>
-
-#include "multicalls.h"
-#include "mmu.h"
-
-xmaddr_t arbitrary_virt_to_machine(unsigned long address)
-{
-	pte_t *pte = lookup_address(address);
-	unsigned offset = address & PAGE_MASK;
-
-	BUG_ON(pte == NULL);
-
-	return XMADDR((pte_mfn(*pte) << PAGE_SHIFT) + offset);
-}
-
-void make_lowmem_page_readonly(void *vaddr)
-{
-	pte_t *pte, ptev;
-	unsigned long address = (unsigned long)vaddr;
-
-	pte = lookup_address(address);
-	BUG_ON(pte == NULL);
-
-	ptev = pte_wrprotect(*pte);
-
-	if (HYPERVISOR_update_va_mapping(address, ptev, 0))
-		BUG();
-}
-
-void make_lowmem_page_readwrite(void *vaddr)
-{
-	pte_t *pte, ptev;
-	unsigned long address = (unsigned long)vaddr;
-
-	pte = lookup_address(address);
-	BUG_ON(pte == NULL);
-
-	ptev = pte_mkwrite(*pte);
-
-	if (HYPERVISOR_update_va_mapping(address, ptev, 0))
-		BUG();
-}
-
-
-void xen_set_pmd(pmd_t *ptr, pmd_t val)
-{
-	struct multicall_space mcs;
-	struct mmu_update *u;
-
-	preempt_disable();
-
-	mcs = xen_mc_entry(sizeof(*u));
-	u = mcs.args;
-	u->ptr = virt_to_machine(ptr).maddr;
-	u->val = pmd_val_ma(val);
-	MULTI_mmu_update(mcs.mc, u, 1, NULL, DOMID_SELF);
-
-	xen_mc_issue(PARAVIRT_LAZY_MMU);
-
-	preempt_enable();
-}
-
-/*
- * Associate a virtual page frame with a given physical page frame
- * and protection flags for that frame.
- */
-void set_pte_mfn(unsigned long vaddr, unsigned long mfn, pgprot_t flags)
-{
-	pgd_t *pgd;
-	pud_t *pud;
-	pmd_t *pmd;
-	pte_t *pte;
-
-	pgd = swapper_pg_dir + pgd_index(vaddr);
-	if (pgd_none(*pgd)) {
-		BUG();
-		return;
-	}
-	pud = pud_offset(pgd, vaddr);
-	if (pud_none(*pud)) {
-		BUG();
-		return;
-	}
-	pmd = pmd_offset(pud, vaddr);
-	if (pmd_none(*pmd)) {
-		BUG();
-		return;
-	}
-	pte = pte_offset_kernel(pmd, vaddr);
-	/* <mfn,flags> stored as-is, to permit clearing entries */
-	xen_set_pte(pte, mfn_pte(mfn, flags));
-
-	/*
-	 * It's enough to flush this one mapping.
-	 * (PGE mappings get flushed as well)
-	 */
-	__flush_tlb_one(vaddr);
-}
-
-void xen_set_pte_at(struct mm_struct *mm, unsigned long addr,
-		    pte_t *ptep, pte_t pteval)
-{
-	if (mm == current->mm || mm == &init_mm) {
-		if (xen_get_lazy_mode() == PARAVIRT_LAZY_MMU) {
-			struct multicall_space mcs;
-			mcs = xen_mc_entry(0);
-
-			MULTI_update_va_mapping(mcs.mc, addr, pteval, 0);
-			xen_mc_issue(PARAVIRT_LAZY_MMU);
-			return;
-		} else
-			if (HYPERVISOR_update_va_mapping(addr, pteval, 0) == 0)
-				return;
-	}
-	xen_set_pte(ptep, pteval);
-}
-
-#ifdef CONFIG_X86_PAE
-void xen_set_pud(pud_t *ptr, pud_t val)
-{
-	struct multicall_space mcs;
-	struct mmu_update *u;
-
-	preempt_disable();
-
-	mcs = xen_mc_entry(sizeof(*u));
-	u = mcs.args;
-	u->ptr = virt_to_machine(ptr).maddr;
-	u->val = pud_val_ma(val);
-	MULTI_mmu_update(mcs.mc, u, 1, NULL, DOMID_SELF);
-
-	xen_mc_issue(PARAVIRT_LAZY_MMU);
-
-	preempt_enable();
-}
-
-void xen_set_pte(pte_t *ptep, pte_t pte)
-{
-	ptep->pte_high = pte.pte_high;
-	smp_wmb();
-	ptep->pte_low = pte.pte_low;
-}
-
-void xen_set_pte_atomic(pte_t *ptep, pte_t pte)
-{
-	set_64bit((u64 *)ptep, pte_val_ma(pte));
-}
-
-void xen_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
-{
-	ptep->pte_low = 0;
-	smp_wmb();		/* make sure low gets written first */
-	ptep->pte_high = 0;
-}
-
-void xen_pmd_clear(pmd_t *pmdp)
-{
-	xen_set_pmd(pmdp, __pmd(0));
-}
-
-unsigned long long xen_pte_val(pte_t pte)
-{
-	unsigned long long ret = 0;
-
-	if (pte.pte_low) {
-		ret = ((unsigned long long)pte.pte_high << 32) | pte.pte_low;
-		ret = machine_to_phys(XMADDR(ret)).paddr | 1;
-	}
-
-	return ret;
-}
-
-unsigned long long xen_pmd_val(pmd_t pmd)
-{
-	unsigned long long ret = pmd.pmd;
-	if (ret)
-		ret = machine_to_phys(XMADDR(ret)).paddr | 1;
-	return ret;
-}
-
-unsigned long long xen_pgd_val(pgd_t pgd)
-{
-	unsigned long long ret = pgd.pgd;
-	if (ret)
-		ret = machine_to_phys(XMADDR(ret)).paddr | 1;
-	return ret;
-}
-
-pte_t xen_make_pte(unsigned long long pte)
-{
-	if (pte & 1)
-		pte = phys_to_machine(XPADDR(pte)).maddr;
-
-	return (pte_t){ pte, pte >> 32 };
-}
-
-pmd_t xen_make_pmd(unsigned long long pmd)
-{
-	if (pmd & 1)
-		pmd = phys_to_machine(XPADDR(pmd)).maddr;
-
-	return (pmd_t){ pmd };
-}
-
-pgd_t xen_make_pgd(unsigned long long pgd)
-{
-	if (pgd & _PAGE_PRESENT)
-		pgd = phys_to_machine(XPADDR(pgd)).maddr;
-
-	return (pgd_t){ pgd };
-}
-#else  /* !PAE */
-void xen_set_pte(pte_t *ptep, pte_t pte)
-{
-	*ptep = pte;
-}
-
-unsigned long xen_pte_val(pte_t pte)
-{
-	unsigned long ret = pte.pte_low;
-
-	if (ret & _PAGE_PRESENT)
-		ret = machine_to_phys(XMADDR(ret)).paddr;
-
-	return ret;
-}
-
-unsigned long xen_pgd_val(pgd_t pgd)
-{
-	unsigned long ret = pgd.pgd;
-	if (ret)
-		ret = machine_to_phys(XMADDR(ret)).paddr | 1;
-	return ret;
-}
-
-pte_t xen_make_pte(unsigned long pte)
-{
-	if (pte & _PAGE_PRESENT)
-		pte = phys_to_machine(XPADDR(pte)).maddr;
-
-	return (pte_t){ pte };
-}
-
-pgd_t xen_make_pgd(unsigned long pgd)
-{
-	if (pgd & _PAGE_PRESENT)
-		pgd = phys_to_machine(XPADDR(pgd)).maddr;
-
-	return (pgd_t){ pgd };
-}
-#endif	/* CONFIG_X86_PAE */
-
-
-
-/*
-  (Yet another) pagetable walker.  This one is intended for pinning a
-  pagetable.  This means that it walks a pagetable and calls the
-  callback function on each page it finds making up the page table,
-  at every level.  It walks the entire pagetable, but it only bothers
-  pinning pte pages which are below pte_limit.  In the normal case
-  this will be TASK_SIZE, but at boot we need to pin up to
-  FIXADDR_TOP.  But the important bit is that we don't pin beyond
-  there, because then we start getting into Xen's ptes.
-*/
-static int pgd_walk(pgd_t *pgd_base, int (*func)(struct page *, unsigned),
-		    unsigned long limit)
-{
-	pgd_t *pgd = pgd_base;
-	int flush = 0;
-	unsigned long addr = 0;
-	unsigned long pgd_next;
-
-	BUG_ON(limit > FIXADDR_TOP);
-
-	if (xen_feature(XENFEAT_auto_translated_physmap))
-		return 0;
-
-	for (; addr != FIXADDR_TOP; pgd++, addr = pgd_next) {
-		pud_t *pud;
-		unsigned long pud_limit, pud_next;
-
-		pgd_next = pud_limit = pgd_addr_end(addr, FIXADDR_TOP);
-
-		if (!pgd_val(*pgd))
-			continue;
-
-		pud = pud_offset(pgd, 0);
-
-		if (PTRS_PER_PUD > 1) /* not folded */
-			flush |= (*func)(virt_to_page(pud), 0);
-
-		for (; addr != pud_limit; pud++, addr = pud_next) {
-			pmd_t *pmd;
-			unsigned long pmd_limit;
-
-			pud_next = pud_addr_end(addr, pud_limit);
-
-			if (pud_next < limit)
-				pmd_limit = pud_next;
-			else
-				pmd_limit = limit;
-
-			if (pud_none(*pud))
-				continue;
-
-			pmd = pmd_offset(pud, 0);
-
-			if (PTRS_PER_PMD > 1) /* not folded */
-				flush |= (*func)(virt_to_page(pmd), 0);
-
-			for (; addr != pmd_limit; pmd++) {
-				addr += (PAGE_SIZE * PTRS_PER_PTE);
-				if ((pmd_limit-1) < (addr-1)) {
-					addr = pmd_limit;
-					break;
-				}
-
-				if (pmd_none(*pmd))
-					continue;
-
-				flush |= (*func)(pmd_page(*pmd), 0);
-			}
-		}
-	}
-
-	flush |= (*func)(virt_to_page(pgd_base), UVMF_TLB_FLUSH);
-
-	return flush;
-}
-
-static int pin_page(struct page *page, unsigned flags)
-{
-	unsigned pgfl = test_and_set_bit(PG_pinned, &page->flags);
-	int flush;
-
-	if (pgfl)
-		flush = 0;		/* already pinned */
-	else if (PageHighMem(page))
-		/* kmaps need flushing if we found an unpinned
-		   highpage */
-		flush = 1;
-	else {
-		void *pt = lowmem_page_address(page);
-		unsigned long pfn = page_to_pfn(page);
-		struct multicall_space mcs = __xen_mc_entry(0);
-
-		flush = 0;
-
-		MULTI_update_va_mapping(mcs.mc, (unsigned long)pt,
-					pfn_pte(pfn, PAGE_KERNEL_RO),
-					flags);
-	}
-
-	return flush;
-}
-
-/* This is called just after a mm has been created, but it has not
-   been used yet.  We need to make sure that its pagetable is all
-   read-only, and can be pinned. */
-void xen_pgd_pin(pgd_t *pgd)
-{
-	struct multicall_space mcs;
-	struct mmuext_op *op;
-
-	xen_mc_batch();
-
-	if (pgd_walk(pgd, pin_page, TASK_SIZE)) {
-		/* re-enable interrupts for kmap_flush_unused */
-		xen_mc_issue(0);
-		kmap_flush_unused();
-		xen_mc_batch();
-	}
-
-	mcs = __xen_mc_entry(sizeof(*op));
-	op = mcs.args;
-
-#ifdef CONFIG_X86_PAE
-	op->cmd = MMUEXT_PIN_L3_TABLE;
-#else
-	op->cmd = MMUEXT_PIN_L2_TABLE;
-#endif
-	op->arg1.mfn = pfn_to_mfn(PFN_DOWN(__pa(pgd)));
-	MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
-
-	xen_mc_issue(0);
-}
-
-/* The init_mm pagetable is really pinned as soon as its created, but
-   that's before we have page structures to store the bits.  So do all
-   the book-keeping now. */
-static __init int mark_pinned(struct page *page, unsigned flags)
-{
-	SetPagePinned(page);
-	return 0;
-}
-
-void __init xen_mark_init_mm_pinned(void)
-{
-	pgd_walk(init_mm.pgd, mark_pinned, FIXADDR_TOP);
-}
-
-static int unpin_page(struct page *page, unsigned flags)
-{
-	unsigned pgfl = test_and_clear_bit(PG_pinned, &page->flags);
-
-	if (pgfl && !PageHighMem(page)) {
-		void *pt = lowmem_page_address(page);
-		unsigned long pfn = page_to_pfn(page);
-		struct multicall_space mcs = __xen_mc_entry(0);
-
-		MULTI_update_va_mapping(mcs.mc, (unsigned long)pt,
-					pfn_pte(pfn, PAGE_KERNEL),
-					flags);
-	}
-
-	return 0;		/* never need to flush on unpin */
-}
-
-/* Release a pagetables pages back as normal RW */
-static void xen_pgd_unpin(pgd_t *pgd)
-{
-	struct mmuext_op *op;
-	struct multicall_space mcs;
-
-	xen_mc_batch();
-
-	mcs = __xen_mc_entry(sizeof(*op));
-
-	op = mcs.args;
-	op->cmd = MMUEXT_UNPIN_TABLE;
-	op->arg1.mfn = pfn_to_mfn(PFN_DOWN(__pa(pgd)));
-
-	MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
-
-	pgd_walk(pgd, unpin_page, TASK_SIZE);
-
-	xen_mc_issue(0);
-}
-
-void xen_activate_mm(struct mm_struct *prev, struct mm_struct *next)
-{
-	spin_lock(&next->page_table_lock);
-	xen_pgd_pin(next->pgd);
-	spin_unlock(&next->page_table_lock);
-}
-
-void xen_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
-{
-	spin_lock(&mm->page_table_lock);
-	xen_pgd_pin(mm->pgd);
-	spin_unlock(&mm->page_table_lock);
-}
-
-
-#ifdef CONFIG_SMP
-/* Another cpu may still have their %cr3 pointing at the pagetable, so
-   we need to repoint it somewhere else before we can unpin it. */
-static void drop_other_mm_ref(void *info)
-{
-	struct mm_struct *mm = info;
-
-	if (__get_cpu_var(cpu_tlbstate).active_mm == mm)
-		leave_mm(smp_processor_id());
-}
-
-static void drop_mm_ref(struct mm_struct *mm)
-{
-	if (current->active_mm == mm) {
-		if (current->mm == mm)
-			load_cr3(swapper_pg_dir);
-		else
-			leave_mm(smp_processor_id());
-	}
-
-	if (!cpus_empty(mm->cpu_vm_mask))
-		xen_smp_call_function_mask(mm->cpu_vm_mask, drop_other_mm_ref,
-					   mm, 1);
-}
-#else
-static void drop_mm_ref(struct mm_struct *mm)
-{
-	if (current->active_mm == mm)
-		load_cr3(swapper_pg_dir);
-}
-#endif
-
-/*
- * While a process runs, Xen pins its pagetables, which means that the
- * hypervisor forces it to be read-only, and it controls all updates
- * to it.  This means that all pagetable updates have to go via the
- * hypervisor, which is moderately expensive.
- *
- * Since we're pulling the pagetable down, we switch to use init_mm,
- * unpin old process pagetable and mark it all read-write, which
- * allows further operations on it to be simple memory accesses.
- *
- * The only subtle point is that another CPU may be still using the
- * pagetable because of lazy tlb flushing.  This means we need need to
- * switch all CPUs off this pagetable before we can unpin it.
- */
-void xen_exit_mmap(struct mm_struct *mm)
-{
-	get_cpu();		/* make sure we don't move around */
-	drop_mm_ref(mm);
-	put_cpu();
-
-	spin_lock(&mm->page_table_lock);
-
-	/* pgd may not be pinned in the error exit path of execve */
-	if (PagePinned(virt_to_page(mm->pgd)))
-		xen_pgd_unpin(mm->pgd);
-	spin_unlock(&mm->page_table_lock);
-}