Merge tag 'for-linus-4.15-rc8-tag' of git://git.kernel.org/pub/scm/linux/kernel/git...

[sfrench/cifs-2.6.git] / arch / x86 / xen / mmu_pv.c

diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c
index c2454237fa672d7ecb14803d6856201d91b872a2..d85076223a696d0b00bee7c22a9e28b1e66dc975 100644 (file)
--- a/arch/x86/xen/mmu_pv.c
+++ b/arch/x86/xen/mmu_pv.c
@@ -315,7 +315,7 @@ void xen_ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
 static pteval_t pte_mfn_to_pfn(pteval_t val)
 {
        if (val & _PAGE_PRESENT) {
-               unsigned long mfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
+               unsigned long mfn = (val & XEN_PTE_MFN_MASK) >> PAGE_SHIFT;
                unsigned long pfn = mfn_to_pfn(mfn);
 
                pteval_t flags = val & PTE_FLAGS_MASK;
@@ -1325,20 +1325,18 @@ static void xen_flush_tlb_others(const struct cpumask *cpus,
 {
        struct {
                struct mmuext_op op;
-#ifdef CONFIG_SMP
-               DECLARE_BITMAP(mask, num_processors);
-#else
                DECLARE_BITMAP(mask, NR_CPUS);
-#endif
        } *args;
        struct multicall_space mcs;
+       const size_t mc_entry_size = sizeof(args->op) +
+               sizeof(args->mask[0]) * BITS_TO_LONGS(num_possible_cpus());
 
        trace_xen_mmu_flush_tlb_others(cpus, info->mm, info->start, info->end);
 
        if (cpumask_empty(cpus))
                return;         /* nothing to do */
 
-       mcs = xen_mc_entry(sizeof(*args));
+       mcs = xen_mc_entry(mc_entry_size);
        args = mcs.args;
        args->op.arg2.vcpumask = to_cpumask(args->mask);
 
@@ -1721,7 +1719,7 @@ static unsigned long __init m2p(phys_addr_t maddr)
 {
        phys_addr_t paddr;
 
-       maddr &= PTE_PFN_MASK;
+       maddr &= XEN_PTE_MFN_MASK;
        paddr = mfn_to_pfn(maddr >> PAGE_SHIFT) << PAGE_SHIFT;
 
        return paddr;
@@ -1902,6 +1900,18 @@ void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
        /* Graft it onto L4[511][510] */
        copy_page(level2_kernel_pgt, l2);
 
+       /*
+        * Zap execute permission from the ident map. Due to the sharing of
+        * L1 entries we need to do this in the L2.
+        */
+       if (__supported_pte_mask & _PAGE_NX) {
+               for (i = 0; i < PTRS_PER_PMD; ++i) {
+                       if (pmd_none(level2_ident_pgt[i]))
+                               continue;
+                       level2_ident_pgt[i] = pmd_set_flags(level2_ident_pgt[i], _PAGE_NX);
+               }
+       }
+
        /* Copy the initial P->M table mappings if necessary. */
        i = pgd_index(xen_start_info->mfn_list);
        if (i && i < pgd_index(__START_KERNEL_map))
@@ -2261,7 +2271,6 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
 
        switch (idx) {
        case FIX_BTMAP_END ... FIX_BTMAP_BEGIN:
-       case FIX_RO_IDT:
 #ifdef CONFIG_X86_32
        case FIX_WP_TEST:
 # ifdef CONFIG_HIGHMEM
@@ -2272,7 +2281,6 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
 #endif
        case FIX_TEXT_POKE0:
        case FIX_TEXT_POKE1:
-       case FIX_CPU_ENTRY_AREA_TOP ... FIX_CPU_ENTRY_AREA_BOTTOM:
                /* All local page mappings */
                pte = pfn_pte(phys, prot);
                break;