[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 03/16] xen dom0: Set up basic IO permissions for dom0.
From: Juan Quintela <quintela@xxxxxxxxxx> Add the direct mapping area for ISA bus access, and enable IO space access for the guest when running as dom0. [ Impact: set iopl for dom0 kernel; map ISA ] Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx> Signed-off-by: Juan Quintela <quintela@xxxxxxxxxx> --- arch/x86/xen/enlighten.c | 8 ++++++++ arch/x86/xen/mmu.c | 24 ++++++++++++++++++++++++ arch/x86/xen/setup.c | 6 +++++- arch/x86/xen/xen-ops.h | 1 + 4 files changed, 38 insertions(+), 1 deletions(-) diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 0a1700a..50580fc 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -1045,6 +1045,7 @@ asmlinkage void __init xen_start_kernel(void) xen_raw_console_write("mapping kernel into physical memory\n"); pgd = xen_setup_kernel_pagetable(pgd, xen_start_info->nr_pages); + xen_ident_map_ISA(); init_mm.pgd = pgd; @@ -1054,6 +1055,13 @@ asmlinkage void __init xen_start_kernel(void) if (xen_feature(XENFEAT_supervisor_mode_kernel)) pv_info.kernel_rpl = 0; + if (xen_initial_domain()) { + struct physdev_set_iopl set_iopl; + set_iopl.iopl = 1; + if (HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl) == -1) + BUG(); + } + /* set the limit of our address space */ xen_reserve_top(); diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c index 760e3a5..dc840ed 100644 --- a/arch/x86/xen/mmu.c +++ b/arch/x86/xen/mmu.c @@ -1615,6 +1615,7 @@ static void *m2v(phys_addr_t maddr) return __ka(m2p(maddr)); } +/* Set the page permissions on an identity-mapped pages */ static void set_page_prot(void *addr, pgprot_t prot) { unsigned long pfn = __pa(addr) >> PAGE_SHIFT; @@ -1840,6 +1841,29 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot) #endif } +__init void xen_ident_map_ISA(void) +{ + unsigned long pa; + + /* + * If we're dom0, then linear map the ISA machine addresses into + * the kernel's address space. + */ + if (!xen_initial_domain()) + return; + + xen_raw_printk("Xen: setup ISA identity maps\n"); + + for (pa = ISA_START_ADDRESS; pa < ISA_END_ADDRESS; pa += PAGE_SIZE) { + pte_t pte = mfn_pte(PFN_DOWN(pa), PAGE_KERNEL_IO); + + if (HYPERVISOR_update_va_mapping(PAGE_OFFSET + pa, pte, 0)) + BUG(); + } + + xen_flush_tlb(); +} + __init void xen_post_allocator_init(void) { pv_mmu_ops.set_pte = xen_set_pte; diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index ad0047f..dc55171 100644 --- a/arch/x86/xen/setup.c +++ b/arch/x86/xen/setup.c @@ -51,6 +51,9 @@ char * __init xen_memory_setup(void) * Even though this is normal, usable memory under Xen, reserve * ISA memory anyway because too many things think they can poke * about in there. + * + * In a dom0 kernel, this region is identity mapped with the + * hardware ISA area, so it really is out of bounds. */ e820_add_region(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS, E820_RESERVED); @@ -188,7 +191,8 @@ void __init xen_arch_setup(void) pm_idle = xen_idle; - paravirt_disable_iospace(); + if (!xen_initial_domain()) + paravirt_disable_iospace(); fiddle_vdso(); } diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h index 5c50a10..6ff6203 100644 --- a/arch/x86/xen/xen-ops.h +++ b/arch/x86/xen/xen-ops.h @@ -29,6 +29,7 @@ void xen_setup_machphys_mapping(void); pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn); void xen_ident_map_ISA(void); void xen_reserve_top(void); +void xen_ident_map_ISA(void); void xen_post_allocator_init(void); -- 1.6.0.6 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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