diff options
Diffstat (limited to 'arch/x86/xen/mmu.c')
| -rw-r--r-- | arch/x86/xen/mmu.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c index a4dea9df0cc0..a5577f59416a 100644 --- a/arch/x86/xen/mmu.c +++ b/arch/x86/xen/mmu.c @@ -51,6 +51,7 @@ #include <asm/mmu_context.h> #include <asm/setup.h> #include <asm/paravirt.h> +#include <asm/e820.h> #include <asm/linkage.h> #include <asm/xen/hypercall.h> @@ -381,7 +382,7 @@ static bool xen_page_pinned(void *ptr) static bool xen_iomap_pte(pte_t pte) { - return xen_initial_domain() && (pte_flags(pte) & _PAGE_IOMAP); + return pte_flags(pte) & _PAGE_IOMAP; } static void xen_set_iomap_pte(pte_t *ptep, pte_t pteval) @@ -583,10 +584,21 @@ PV_CALLEE_SAVE_REGS_THUNK(xen_pgd_val); pte_t xen_make_pte(pteval_t pte) { - if (unlikely(xen_initial_domain() && (pte & _PAGE_IOMAP))) + phys_addr_t addr = (pte & PTE_PFN_MASK); + + /* + * Unprivileged domains are allowed to do IOMAPpings for + * PCI passthrough, but not map ISA space. The ISA + * mappings are just dummy local mappings to keep other + * parts of the kernel happy. + */ + if (unlikely(pte & _PAGE_IOMAP) && + (xen_initial_domain() || addr >= ISA_END_ADDRESS)) { pte = iomap_pte(pte); - else + } else { + pte &= ~_PAGE_IOMAP; pte = pte_pfn_to_mfn(pte); + } return native_make_pte(pte); } |