lguest: PAE support

This version requires that host and guest have the same PAE status.
NX cap is not offered to the guest, yet.

Signed-off-by: Matias Zabaljauregui <zabaljauregui@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 313 insertions, 38 deletions

diff --git a/drivers/lguest/page_tables.c b/drivers/lguest/page_tables.c
index 6a54d76b6236..5e2c26adcf06 100644
--- a/drivers/lguest/page_tables.c
+++ b/drivers/lguest/page_tables.c
@@ -53,6 +53,17 @@
  * page.  */
 #define SWITCHER_PGD_INDEX (PTRS_PER_PGD - 1)
 
+/* For PAE we need the PMD index as well. We use the last 2MB, so we
+ * will need the last pmd entry of the last pmd page.  */
+#ifdef CONFIG_X86_PAE
+#define SWITCHER_PMD_INDEX      (PTRS_PER_PMD - 1)
+#define RESERVE_MEM             2U
+#define CHECK_GPGD_MASK         _PAGE_PRESENT
+#else
+#define RESERVE_MEM             4U
+#define CHECK_GPGD_MASK         _PAGE_TABLE
+#endif
+
 /* We actually need a separate PTE page for each CPU.  Remember that after the
  * Switcher code itself comes two pages for each CPU, and we don't want this
  * CPU's guest to see the pages of any other CPU. */
@@ -73,23 +84,58 @@ static pgd_t *spgd_addr(struct lg_cpu *cpu, u32 i, unsigned long vaddr)
 {
         unsigned int index = pgd_index(vaddr);
 
+#ifndef CONFIG_X86_PAE
         /* We kill any Guest trying to touch the Switcher addresses. */
         if (index >= SWITCHER_PGD_INDEX) {
                 kill_guest(cpu, "attempt to access switcher pages");
                 index = 0;
         }
+#endif
         /* Return a pointer index'th pgd entry for the i'th page table. */
         return &cpu->lg->pgdirs[i].pgdir[index];
 }
 
+#ifdef CONFIG_X86_PAE
+/* This routine then takes the PGD entry given above, which contains the
+ * address of the PMD page.  It then returns a pointer to the PMD entry for the
+ * given address. */
+static pmd_t *spmd_addr(struct lg_cpu *cpu, pgd_t spgd, unsigned long vaddr)
+{
+        unsigned int index = pmd_index(vaddr);
+        pmd_t *page;
+
+        /* We kill any Guest trying to touch the Switcher addresses. */
+        if (pgd_index(vaddr) == SWITCHER_PGD_INDEX &&
+                                        index >= SWITCHER_PMD_INDEX) {
+                kill_guest(cpu, "attempt to access switcher pages");
+                index = 0;
+        }
+
+        /* You should never call this if the PGD entry wasn't valid */
+        BUG_ON(!(pgd_flags(spgd) & _PAGE_PRESENT));
+        page = __va(pgd_pfn(spgd) << PAGE_SHIFT);
+
+        return &page[index];
+}
+#endif
+
 /* This routine then takes the page directory entry returned above, which
  * contains the address of the page table entry (PTE) page.  It then returns a
  * pointer to the PTE entry for the given address. */
-static pte_t *spte_addr(pgd_t spgd, unsigned long vaddr)
+static pte_t *spte_addr(struct lg_cpu *cpu, pgd_t spgd, unsigned long vaddr)
 {
+#ifdef CONFIG_X86_PAE
+        pmd_t *pmd = spmd_addr(cpu, spgd, vaddr);
+        pte_t *page = __va(pmd_pfn(*pmd) << PAGE_SHIFT);
+
+        /* You should never call this if the PMD entry wasn't valid */
+        BUG_ON(!(pmd_flags(*pmd) & _PAGE_PRESENT));
+#else
         pte_t *page = __va(pgd_pfn(spgd) << PAGE_SHIFT);
         /* You should never call this if the PGD entry wasn't valid */
         BUG_ON(!(pgd_flags(spgd) & _PAGE_PRESENT));
+#endif
+
         return &page[pte_index(vaddr)];
 }
 
@@ -101,10 +147,31 @@ static unsigned long gpgd_addr(struct lg_cpu *cpu, unsigned long vaddr)
         return cpu->lg->pgdirs[cpu->cpu_pgd].gpgdir + index * sizeof(pgd_t);
 }
 
-static unsigned long gpte_addr(pgd_t gpgd, unsigned long vaddr)
+#ifdef CONFIG_X86_PAE
+static unsigned long gpmd_addr(pgd_t gpgd, unsigned long vaddr)
 {
         unsigned long gpage = pgd_pfn(gpgd) << PAGE_SHIFT;
         BUG_ON(!(pgd_flags(gpgd) & _PAGE_PRESENT));
+        return gpage + pmd_index(vaddr) * sizeof(pmd_t);
+}
+#endif
+
+static unsigned long gpte_addr(struct lg_cpu *cpu,
+                                pgd_t gpgd, unsigned long vaddr)
+{
+#ifdef CONFIG_X86_PAE
+        pmd_t gpmd;
+#endif
+        unsigned long gpage;
+
+        BUG_ON(!(pgd_flags(gpgd) & _PAGE_PRESENT));
+#ifdef CONFIG_X86_PAE
+        gpmd = lgread(cpu, gpmd_addr(gpgd, vaddr), pmd_t);
+        gpage = pmd_pfn(gpmd) << PAGE_SHIFT;
+        BUG_ON(!(pmd_flags(gpmd) & _PAGE_PRESENT));
+#else
+        gpage = pgd_pfn(gpgd) << PAGE_SHIFT;
+#endif
         return gpage + pte_index(vaddr) * sizeof(pte_t);
 }
 /*:*/
@@ -184,11 +251,20 @@ static void check_gpte(struct lg_cpu *cpu, pte_t gpte)
 
 static void check_gpgd(struct lg_cpu *cpu, pgd_t gpgd)
 {
-        if ((pgd_flags(gpgd) & ~_PAGE_TABLE) ||
+        if ((pgd_flags(gpgd) & ~CHECK_GPGD_MASK) ||
            (pgd_pfn(gpgd) >= cpu->lg->pfn_limit))
                 kill_guest(cpu, "bad page directory entry");
 }
 
+#ifdef CONFIG_X86_PAE
+static void check_gpmd(struct lg_cpu *cpu, pmd_t gpmd)
+{
+        if ((pmd_flags(gpmd) & ~_PAGE_TABLE) ||
+           (pmd_pfn(gpmd) >= cpu->lg->pfn_limit))
+                kill_guest(cpu, "bad page middle directory entry");
+}
+#endif
+
 /*H:330
  * (i) Looking up a page table entry when the Guest faults.
  *
@@ -207,6 +283,11 @@ bool demand_page(struct lg_cpu *cpu, unsigned long vaddr, int errcode)
         pte_t gpte;
         pte_t *spte;
 
+#ifdef CONFIG_X86_PAE
+        pmd_t *spmd;
+        pmd_t gpmd;
+#endif
+
         /* First step: get the top-level Guest page table entry. */
         gpgd = lgread(cpu, gpgd_addr(cpu, vaddr), pgd_t);
         /* Toplevel not present?  We can't map it in. */
@@ -228,12 +309,40 @@ bool demand_page(struct lg_cpu *cpu, unsigned long vaddr, int errcode)
                 check_gpgd(cpu, gpgd);
                 /* And we copy the flags to the shadow PGD entry.  The page
                  * number in the shadow PGD is the page we just allocated. */
-                *spgd = __pgd(__pa(ptepage) | pgd_flags(gpgd));
+                set_pgd(spgd, __pgd(__pa(ptepage) | pgd_flags(gpgd)));
         }
 
+#ifdef CONFIG_X86_PAE
+        gpmd = lgread(cpu, gpmd_addr(gpgd, vaddr), pmd_t);
+        /* middle level not present?  We can't map it in. */
+        if (!(pmd_flags(gpmd) & _PAGE_PRESENT))
+                return false;
+
+        /* Now look at the matching shadow entry. */
+        spmd = spmd_addr(cpu, *spgd, vaddr);
+
+        if (!(pmd_flags(*spmd) & _PAGE_PRESENT)) {
+                /* No shadow entry: allocate a new shadow PTE page. */
+                unsigned long ptepage = get_zeroed_page(GFP_KERNEL);
+
+                /* This is not really the Guest's fault, but killing it is
+                * simple for this corner case. */
+                if (!ptepage) {
+                        kill_guest(cpu, "out of memory allocating pte page");
+                        return false;
+                }
+
+                /* We check that the Guest pmd is OK. */
+                check_gpmd(cpu, gpmd);
+
+                /* And we copy the flags to the shadow PMD entry.  The page
+                 * number in the shadow PMD is the page we just allocated. */
+                native_set_pmd(spmd, __pmd(__pa(ptepage) | pmd_flags(gpmd)));
+        }
+#endif
         /* OK, now we look at the lower level in the Guest page table: keep its
          * address, because we might update it later. */
-        gpte_ptr = gpte_addr(gpgd, vaddr);
+        gpte_ptr = gpte_addr(cpu, gpgd, vaddr);
         gpte = lgread(cpu, gpte_ptr, pte_t);
 
         /* If this page isn't in the Guest page tables, we can't page it in. */
@@ -259,7 +368,7 @@ bool demand_page(struct lg_cpu *cpu, unsigned long vaddr, int errcode)
                 gpte = pte_mkdirty(gpte);
 
         /* Get the pointer to the shadow PTE entry we're going to set. */
-        spte = spte_addr(*spgd, vaddr);
+        spte = spte_addr(cpu, *spgd, vaddr);
         /* If there was a valid shadow PTE entry here before, we release it.
          * This can happen with a write to a previously read-only entry. */
         release_pte(*spte);
@@ -301,14 +410,23 @@ static bool page_writable(struct lg_cpu *cpu, unsigned long vaddr)
         pgd_t *spgd;
         unsigned long flags;
 
+#ifdef CONFIG_X86_PAE
+        pmd_t *spmd;
+#endif
         /* Look at the current top level entry: is it present? */
         spgd = spgd_addr(cpu, cpu->cpu_pgd, vaddr);
         if (!(pgd_flags(*spgd) & _PAGE_PRESENT))
                 return false;
 
+#ifdef CONFIG_X86_PAE
+        spmd = spmd_addr(cpu, *spgd, vaddr);
+        if (!(pmd_flags(*spmd) & _PAGE_PRESENT))
+                return false;
+#endif
+
         /* Check the flags on the pte entry itself: it must be present and
          * writable. */
-        flags = pte_flags(*(spte_addr(*spgd, vaddr)));
+        flags = pte_flags(*(spte_addr(cpu, *spgd, vaddr)));
 
         return (flags & (_PAGE_PRESENT|_PAGE_RW)) == (_PAGE_PRESENT|_PAGE_RW);
 }
@@ -322,6 +440,41 @@ void pin_page(struct lg_cpu *cpu, unsigned long vaddr)
                 kill_guest(cpu, "bad stack page %#lx", vaddr);
 }
 
+#ifdef CONFIG_X86_PAE
+static void release_pmd(pmd_t *spmd)
+{
+        /* If the entry's not present, there's nothing to release. */
+        if (pmd_flags(*spmd) & _PAGE_PRESENT) {
+                unsigned int i;
+                pte_t *ptepage = __va(pmd_pfn(*spmd) << PAGE_SHIFT);
+                /* For each entry in the page, we might need to release it. */
+                for (i = 0; i < PTRS_PER_PTE; i++)
+                        release_pte(ptepage[i]);
+                /* Now we can free the page of PTEs */
+                free_page((long)ptepage);
+                /* And zero out the PMD entry so we never release it twice. */
+                native_set_pmd(spmd, __pmd(0));
+        }
+}
+
+static void release_pgd(pgd_t *spgd)
+{
+        /* If the entry's not present, there's nothing to release. */
+        if (pgd_flags(*spgd) & _PAGE_PRESENT) {
+                unsigned int i;
+                pmd_t *pmdpage = __va(pgd_pfn(*spgd) << PAGE_SHIFT);
+
+                for (i = 0; i < PTRS_PER_PMD; i++)
+                        release_pmd(&pmdpage[i]);
+
+                /* Now we can free the page of PMDs */
+                free_page((long)pmdpage);
+                /* And zero out the PGD entry so we never release it twice. */
+                set_pgd(spgd, __pgd(0));
+        }
+}
+
+#else /* !CONFIG_X86_PAE */
 /*H:450 If we chase down the release_pgd() code, it looks like this: */
 static void release_pgd(pgd_t *spgd)
 {
@@ -341,7 +494,7 @@ static void release_pgd(pgd_t *spgd)
                 *spgd = __pgd(0);
         }
 }
-
+#endif
 /*H:445 We saw flush_user_mappings() twice: once from the flush_user_mappings()
  * hypercall and once in new_pgdir() when we re-used a top-level pgdir page.
  * It simply releases every PTE page from 0 up to the Guest's kernel address. */
@@ -370,6 +523,9 @@ unsigned long guest_pa(struct lg_cpu *cpu, unsigned long vaddr)
         pgd_t gpgd;
         pte_t gpte;
 
+#ifdef CONFIG_X86_PAE
+        pmd_t gpmd;
+#endif
         /* First step: get the top-level Guest page table entry. */
         gpgd = lgread(cpu, gpgd_addr(cpu, vaddr), pgd_t);
         /* Toplevel not present?  We can't map it in. */
@@ -378,7 +534,13 @@ unsigned long guest_pa(struct lg_cpu *cpu, unsigned long vaddr)
                 return -1UL;
         }
 
-        gpte = lgread(cpu, gpte_addr(gpgd, vaddr), pte_t);
+        gpte = lgread(cpu, gpte_addr(cpu, gpgd, vaddr), pte_t);
+#ifdef CONFIG_X86_PAE
+        gpmd = lgread(cpu, gpmd_addr(gpgd, vaddr), pmd_t);
+        if (!(pmd_flags(gpmd) & _PAGE_PRESENT))
+                kill_guest(cpu, "Bad address %#lx", vaddr);
+#endif
+        gpte = lgread(cpu, gpte_addr(cpu, gpgd, vaddr), pte_t);
         if (!(pte_flags(gpte) & _PAGE_PRESENT))
                 kill_guest(cpu, "Bad address %#lx", vaddr);
 
@@ -405,6 +567,9 @@ static unsigned int new_pgdir(struct lg_cpu *cpu,
                               int *blank_pgdir)
 {
         unsigned int next;
+#ifdef CONFIG_X86_PAE
+        pmd_t *pmd_table;
+#endif
 
         /* We pick one entry at random to throw out.  Choosing the Least
          * Recently Used might be better, but this is easy. */
@@ -416,10 +581,27 @@ static unsigned int new_pgdir(struct lg_cpu *cpu,
                 /* If the allocation fails, just keep using the one we have */
                 if (!cpu->lg->pgdirs[next].pgdir)
                         next = cpu->cpu_pgd;
-                else
-                        /* This is a blank page, so there are no kernel
-                         * mappings: caller must map the stack! */
+                else {
+#ifdef CONFIG_X86_PAE
+                        /* In PAE mode, allocate a pmd page and populate the
+                         * last pgd entry. */
+                        pmd_table = (pmd_t *)get_zeroed_page(GFP_KERNEL);
+                        if (!pmd_table) {
+                                free_page((long)cpu->lg->pgdirs[next].pgdir);
+                                set_pgd(cpu->lg->pgdirs[next].pgdir, __pgd(0));
+                                next = cpu->cpu_pgd;
+                        } else {
+                                set_pgd(cpu->lg->pgdirs[next].pgdir +
+                                        SWITCHER_PGD_INDEX,
+                                        __pgd(__pa(pmd_table) | _PAGE_PRESENT));
+                                /* This is a blank page, so there are no kernel
+                                 * mappings: caller must map the stack! */
+                                *blank_pgdir = 1;
+                        }
+#else
                         *blank_pgdir = 1;
+#endif
+                }
         }
         /* Record which Guest toplevel this shadows. */
         cpu->lg->pgdirs[next].gpgdir = gpgdir;
@@ -460,10 +642,25 @@ static void release_all_pagetables(struct lguest *lg)
 
         /* Every shadow pagetable this Guest has */
         for (i = 0; i < ARRAY_SIZE(lg->pgdirs); i++)
-                if (lg->pgdirs[i].pgdir)
+                if (lg->pgdirs[i].pgdir) {
+#ifdef CONFIG_X86_PAE
+                        pgd_t *spgd;
+                        pmd_t *pmdpage;
+                        unsigned int k;
+
+                        /* Get the last pmd page. */
+                        spgd = lg->pgdirs[i].pgdir + SWITCHER_PGD_INDEX;
+                        pmdpage = __va(pgd_pfn(*spgd) << PAGE_SHIFT);
+
+                        /* And release the pmd entries of that pmd page,
+                         * except for the switcher pmd. */
+                        for (k = 0; k < SWITCHER_PMD_INDEX; k++)
+                                release_pmd(&pmdpage[k]);
+#endif
                         /* Every PGD entry except the Switcher at the top */
                         for (j = 0; j < SWITCHER_PGD_INDEX; j++)
                                 release_pgd(lg->pgdirs[i].pgdir + j);
+                }
 }
 
 /* We also throw away everything when a Guest tells us it's changed a kernel
@@ -504,24 +701,37 @@ static void do_set_pte(struct lg_cpu *cpu, int idx,
 {
         /* Look up the matching shadow page directory entry. */
         pgd_t *spgd = spgd_addr(cpu, idx, vaddr);
+#ifdef CONFIG_X86_PAE
+        pmd_t *spmd;
+#endif
 
         /* If the top level isn't present, there's no entry to update. */
         if (pgd_flags(*spgd) & _PAGE_PRESENT) {
-                /* Otherwise, we start by releasing the existing entry. */
-                pte_t *spte = spte_addr(*spgd, vaddr);
-                release_pte(*spte);
-
-                /* If they're setting this entry as dirty or accessed, we might
-                 * as well put that entry they've given us in now.  This shaves
-                 * 10% off a copy-on-write micro-benchmark. */
-                if (pte_flags(gpte) & (_PAGE_DIRTY | _PAGE_ACCESSED)) {
-                        check_gpte(cpu, gpte);
-                        *spte = gpte_to_spte(cpu, gpte,
-                                             pte_flags(gpte) & _PAGE_DIRTY);
-                } else
-                        /* Otherwise kill it and we can demand_page() it in
-                         * later. */
-                        *spte = __pte(0);
+#ifdef CONFIG_X86_PAE
+                spmd = spmd_addr(cpu, *spgd, vaddr);
+                if (pmd_flags(*spmd) & _PAGE_PRESENT) {
+#endif
+                        /* Otherwise, we start by releasing
+                         * the existing entry. */
+                        pte_t *spte = spte_addr(cpu, *spgd, vaddr);
+                        release_pte(*spte);
+
+                        /* If they're setting this entry as dirty or accessed,
+                         * we might as well put that entry they've given us
+                         * in now.  This shaves 10% off a
+                         * copy-on-write micro-benchmark. */
+                        if (pte_flags(gpte) & (_PAGE_DIRTY | _PAGE_ACCESSED)) {
+                                check_gpte(cpu, gpte);
+                                native_set_pte(spte,
+                                                gpte_to_spte(cpu, gpte,
+                                                pte_flags(gpte) & _PAGE_DIRTY));
+                        } else
+                                /* Otherwise kill it and we can demand_page()
+                                 * it in later. */
+                                native_set_pte(spte, __pte(0));
+#ifdef CONFIG_X86_PAE
+                }
+#endif
         }
 }
 
@@ -572,8 +782,6 @@ void guest_set_pgd(struct lguest *lg, unsigned long gpgdir, u32 idx)
 {
         int pgdir;
 
-        /* The kernel seems to try to initialize this early on: we ignore its
-         * attempts to map over the Switcher. */
         if (idx >= SWITCHER_PGD_INDEX)
                 return;
 
@@ -583,6 +791,12 @@ void guest_set_pgd(struct lguest *lg, unsigned long gpgdir, u32 idx)
                 /* ... throw it away. */
                 release_pgd(lg->pgdirs[pgdir].pgdir + idx);
 }
+#ifdef CONFIG_X86_PAE
+void guest_set_pmd(struct lguest *lg, unsigned long pmdp, u32 idx)
+{
+        guest_pagetable_clear_all(&lg->cpus[0]);
+}
+#endif
 
 /* Once we know how much memory we have we can construct simple identity
  * (which set virtual == physical) and linear mappings
@@ -596,8 +810,16 @@ static unsigned long setup_pagetables(struct lguest *lg,
 {
         pgd_t __user *pgdir;
         pte_t __user *linear;
-        unsigned int mapped_pages, i, linear_pages, phys_linear;
         unsigned long mem_base = (unsigned long)lg->mem_base;
+        unsigned int mapped_pages, i, linear_pages;
+#ifdef CONFIG_X86_PAE
+        pmd_t __user *pmds;
+        unsigned int j;
+        pgd_t pgd;
+        pmd_t pmd;
+#else
+        unsigned int phys_linear;
+#endif
 
         /* We have mapped_pages frames to map, so we need
          * linear_pages page tables to map them. */
@@ -610,6 +832,9 @@ static unsigned long setup_pagetables(struct lguest *lg,
         /* Now we use the next linear_pages pages as pte pages */
         linear = (void *)pgdir - linear_pages * PAGE_SIZE;
 
+#ifdef CONFIG_X86_PAE
+        pmds = (void *)linear - PAGE_SIZE;
+#endif
         /* Linear mapping is easy: put every page's address into the
          * mapping in order. */
         for (i = 0; i < mapped_pages; i++) {
@@ -621,6 +846,22 @@ static unsigned long setup_pagetables(struct lguest *lg,
 
         /* The top level points to the linear page table pages above.
          * We setup the identity and linear mappings here. */
+#ifdef CONFIG_X86_PAE
+        for (i = 0, j; i < mapped_pages && j < PTRS_PER_PMD;
+             i += PTRS_PER_PTE, j++) {
+                native_set_pmd(&pmd, __pmd(((unsigned long)(linear + i)
+                - mem_base) | _PAGE_PRESENT | _PAGE_RW | _PAGE_USER));
+
+                if (copy_to_user(&pmds[j], &pmd, sizeof(pmd)) != 0)
+                        return -EFAULT;
+        }
+
+        set_pgd(&pgd, __pgd(((u32)pmds - mem_base) | _PAGE_PRESENT));
+        if (copy_to_user(&pgdir[0], &pgd, sizeof(pgd)) != 0)
+                return -EFAULT;
+        if (copy_to_user(&pgdir[3], &pgd, sizeof(pgd)) != 0)
+                return -EFAULT;
+#else
         phys_linear = (unsigned long)linear - mem_base;
         for (i = 0; i < mapped_pages; i += PTRS_PER_PTE) {
                 pgd_t pgd;
@@ -633,6 +874,7 @@ static unsigned long setup_pagetables(struct lguest *lg,
                                     &pgd, sizeof(pgd)))
                         return -EFAULT;
         }
+#endif
 
         /* We return the top level (guest-physical) address: remember where
          * this is. */
@@ -648,7 +890,10 @@ int init_guest_pagetable(struct lguest *lg)
         u64 mem;
         u32 initrd_size;
         struct boot_params __user *boot = (struct boot_params *)lg->mem_base;
-
+#ifdef CONFIG_X86_PAE
+        pgd_t *pgd;
+        pmd_t *pmd_table;
+#endif
         /* Get the Guest memory size and the ramdisk size from the boot header
          * located at lg->mem_base (Guest address 0). */
         if (copy_from_user(&mem, &boot->e820_map[0].size, sizeof(mem))
@@ -663,6 +908,15 @@ int init_guest_pagetable(struct lguest *lg)
         lg->pgdirs[0].pgdir = (pgd_t *)get_zeroed_page(GFP_KERNEL);
         if (!lg->pgdirs[0].pgdir)
                 return -ENOMEM;
+#ifdef CONFIG_X86_PAE
+        pgd = lg->pgdirs[0].pgdir;
+        pmd_table = (pmd_t *) get_zeroed_page(GFP_KERNEL);
+        if (!pmd_table)
+                return -ENOMEM;
+
+        set_pgd(pgd + SWITCHER_PGD_INDEX,
+                __pgd(__pa(pmd_table) | _PAGE_PRESENT));
+#endif
         lg->cpus[0].cpu_pgd = 0;
         return 0;
 }
@@ -672,17 +926,24 @@ void page_table_guest_data_init(struct lg_cpu *cpu)
 {
         /* We get the kernel address: above this is all kernel memory. */
         if (get_user(cpu->lg->kernel_address,
-                     &cpu->lg->lguest_data->kernel_address)
-            /* We tell the Guest that it can't use the top 4MB of virtual
-             * addresses used by the Switcher. */
-            || put_user(4U*1024*1024, &cpu->lg->lguest_data->reserve_mem)
-            || put_user(cpu->lg->pgdirs[0].gpgdir, &cpu->lg->lguest_data->pgdir))
+                &cpu->lg->lguest_data->kernel_address)
+                /* We tell the Guest that it can't use the top 2 or 4 MB
+                 * of virtual addresses used by the Switcher. */
+                || put_user(RESERVE_MEM * 1024 * 1024,
+                        &cpu->lg->lguest_data->reserve_mem)
+                || put_user(cpu->lg->pgdirs[0].gpgdir,
+                        &cpu->lg->lguest_data->pgdir))
                 kill_guest(cpu, "bad guest page %p", cpu->lg->lguest_data);
 
         /* In flush_user_mappings() we loop from 0 to
          * "pgd_index(lg->kernel_address)".  This assumes it won't hit the
          * Switcher mappings, so check that now. */
+#ifdef CONFIG_X86_PAE
+        if (pgd_index(cpu->lg->kernel_address) == SWITCHER_PGD_INDEX &&
+                pmd_index(cpu->lg->kernel_address) == SWITCHER_PMD_INDEX)
+#else
         if (pgd_index(cpu->lg->kernel_address) >= SWITCHER_PGD_INDEX)
+#endif
                 kill_guest(cpu, "bad kernel address %#lx",
                                  cpu->lg->kernel_address);
 }
@@ -708,16 +969,30 @@ void free_guest_pagetable(struct lguest *lg)
 void map_switcher_in_guest(struct lg_cpu *cpu, struct lguest_pages *pages)
 {
         pte_t *switcher_pte_page = __get_cpu_var(switcher_pte_pages);
-        pgd_t switcher_pgd;
         pte_t regs_pte;
         unsigned long pfn;
 
+#ifdef CONFIG_X86_PAE
+        pmd_t switcher_pmd;
+        pmd_t *pmd_table;
+
+        native_set_pmd(&switcher_pmd, pfn_pmd(__pa(switcher_pte_page) >>
+                       PAGE_SHIFT, PAGE_KERNEL_EXEC));
+
+        pmd_table = __va(pgd_pfn(cpu->lg->
+                        pgdirs[cpu->cpu_pgd].pgdir[SWITCHER_PGD_INDEX])
+                                                                << PAGE_SHIFT);
+        native_set_pmd(&pmd_table[SWITCHER_PMD_INDEX], switcher_pmd);
+#else
+        pgd_t switcher_pgd;
+
         /* Make the last PGD entry for this Guest point to the Switcher's PTE
          * page for this CPU (with appropriate flags). */
         switcher_pgd = __pgd(__pa(switcher_pte_page) | __PAGE_KERNEL_EXEC);
 
         cpu->lg->pgdirs[cpu->cpu_pgd].pgdir[SWITCHER_PGD_INDEX] = switcher_pgd;
 
+#endif
         /* We also change the Switcher PTE page.  When we're running the Guest,
          * we want the Guest's "regs" page to appear where the first Switcher
          * page for this CPU is.  This is an optimization: when the Switcher