From 6a773cb825afb74a600a08fe87fab55ee98ec2ac Mon Sep 17 00:00:00 2001 From: Cornelia Huck Date: Thu, 28 Feb 2013 12:33:17 +0100 Subject: KVM: s390: Export virtio-ccw api. Export the virtio-ccw api in a header for usage by other code. Signed-off-by: Cornelia Huck Signed-off-by: Marcelo Tosatti --- arch/s390/include/uapi/asm/Kbuild | 1 + arch/s390/include/uapi/asm/virtio-ccw.h | 21 +++++++++++++++++++++ 2 files changed, 22 insertions(+) create mode 100644 arch/s390/include/uapi/asm/virtio-ccw.h (limited to 'arch/s390/include') diff --git a/arch/s390/include/uapi/asm/Kbuild b/arch/s390/include/uapi/asm/Kbuild index 7bf68fff7c5..9ccd1905bda 100644 --- a/arch/s390/include/uapi/asm/Kbuild +++ b/arch/s390/include/uapi/asm/Kbuild @@ -44,5 +44,6 @@ header-y += termios.h header-y += types.h header-y += ucontext.h header-y += unistd.h +header-y += virtio-ccw.h header-y += vtoc.h header-y += zcrypt.h diff --git a/arch/s390/include/uapi/asm/virtio-ccw.h b/arch/s390/include/uapi/asm/virtio-ccw.h new file mode 100644 index 00000000000..a9a4ebf79fa --- /dev/null +++ b/arch/s390/include/uapi/asm/virtio-ccw.h @@ -0,0 +1,21 @@ +/* + * Definitions for virtio-ccw devices. + * + * Copyright IBM Corp. 2013 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License (version 2 only) + * as published by the Free Software Foundation. + * + * Author(s): Cornelia Huck + */ +#ifndef __KVM_VIRTIO_CCW_H +#define __KVM_VIRTIO_CCW_H + +/* Alignment of vring buffers. */ +#define KVM_VIRTIO_CCW_RING_ALIGN 4096 + +/* Subcode for diagnose 500 (virtio hypercall). */ +#define KVM_S390_VIRTIO_CCW_NOTIFY 3 + +#endif -- cgit v1.2.3-70-g09d2 From 9e0fdb4145205bea95c2888a195c3ead2652f120 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Tue, 5 Mar 2013 13:14:41 +0100 Subject: s390/mm,gmap: implement gmap_translate() Implement gmap_translate() function which translates a guest absolute address to a user space process address without establishing the guest page table entries. This is useful for kvm guest address translations where no memory access is expected to happen soon (e.g. tprot exception handler). Signed-off-by: Heiko Carstens Reviewed-by: Christian Borntraeger Signed-off-by: Martin Schwidefsky Signed-off-by: Christian Borntraeger Signed-off-by: Marcelo Tosatti --- arch/s390/include/asm/pgtable.h | 2 + arch/s390/mm/pgtable.c | 107 +++++++++++++++++++++++++++++++--------- 2 files changed, 87 insertions(+), 22 deletions(-) (limited to 'arch/s390/include') diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index 4a2930844d4..75b8750a16f 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -759,6 +759,8 @@ void gmap_disable(struct gmap *gmap); int gmap_map_segment(struct gmap *gmap, unsigned long from, unsigned long to, unsigned long length); int gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len); +unsigned long __gmap_translate(unsigned long address, struct gmap *); +unsigned long gmap_translate(unsigned long address, struct gmap *); unsigned long __gmap_fault(unsigned long address, struct gmap *); unsigned long gmap_fault(unsigned long address, struct gmap *); void gmap_discard(unsigned long from, unsigned long to, struct gmap *); diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index ae44d2a3431..2accf7113d1 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -379,45 +379,108 @@ out_unmap: } EXPORT_SYMBOL_GPL(gmap_map_segment); +static unsigned long *gmap_table_walk(unsigned long address, struct gmap *gmap) +{ + unsigned long *table; + + table = gmap->table + ((address >> 53) & 0x7ff); + if (unlikely(*table & _REGION_ENTRY_INV)) + return ERR_PTR(-EFAULT); + table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN); + table = table + ((address >> 42) & 0x7ff); + if (unlikely(*table & _REGION_ENTRY_INV)) + return ERR_PTR(-EFAULT); + table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN); + table = table + ((address >> 31) & 0x7ff); + if (unlikely(*table & _REGION_ENTRY_INV)) + return ERR_PTR(-EFAULT); + table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN); + table = table + ((address >> 20) & 0x7ff); + return table; +} + +/** + * __gmap_translate - translate a guest address to a user space address + * @address: guest address + * @gmap: pointer to guest mapping meta data structure + * + * Returns user space address which corresponds to the guest address or + * -EFAULT if no such mapping exists. + * This function does not establish potentially missing page table entries. + * The mmap_sem of the mm that belongs to the address space must be held + * when this function gets called. + */ +unsigned long __gmap_translate(unsigned long address, struct gmap *gmap) +{ + unsigned long *segment_ptr, vmaddr, segment; + struct gmap_pgtable *mp; + struct page *page; + + current->thread.gmap_addr = address; + segment_ptr = gmap_table_walk(address, gmap); + if (IS_ERR(segment_ptr)) + return PTR_ERR(segment_ptr); + /* Convert the gmap address to an mm address. */ + segment = *segment_ptr; + if (!(segment & _SEGMENT_ENTRY_INV)) { + page = pfn_to_page(segment >> PAGE_SHIFT); + mp = (struct gmap_pgtable *) page->index; + return mp->vmaddr | (address & ~PMD_MASK); + } else if (segment & _SEGMENT_ENTRY_RO) { + vmaddr = segment & _SEGMENT_ENTRY_ORIGIN; + return vmaddr | (address & ~PMD_MASK); + } + return -EFAULT; +} +EXPORT_SYMBOL_GPL(__gmap_translate); + +/** + * gmap_translate - translate a guest address to a user space address + * @address: guest address + * @gmap: pointer to guest mapping meta data structure + * + * Returns user space address which corresponds to the guest address or + * -EFAULT if no such mapping exists. + * This function does not establish potentially missing page table entries. + */ +unsigned long gmap_translate(unsigned long address, struct gmap *gmap) +{ + unsigned long rc; + + down_read(&gmap->mm->mmap_sem); + rc = __gmap_translate(address, gmap); + up_read(&gmap->mm->mmap_sem); + return rc; +} +EXPORT_SYMBOL_GPL(gmap_translate); + /* * this function is assumed to be called with mmap_sem held */ unsigned long __gmap_fault(unsigned long address, struct gmap *gmap) { - unsigned long *table, vmaddr, segment; - struct mm_struct *mm; + unsigned long *segment_ptr, vmaddr, segment; + struct vm_area_struct *vma; struct gmap_pgtable *mp; struct gmap_rmap *rmap; - struct vm_area_struct *vma; + struct mm_struct *mm; struct page *page; pgd_t *pgd; pud_t *pud; pmd_t *pmd; current->thread.gmap_addr = address; - mm = gmap->mm; - /* Walk the gmap address space page table */ - table = gmap->table + ((address >> 53) & 0x7ff); - if (unlikely(*table & _REGION_ENTRY_INV)) - return -EFAULT; - table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN); - table = table + ((address >> 42) & 0x7ff); - if (unlikely(*table & _REGION_ENTRY_INV)) + segment_ptr = gmap_table_walk(address, gmap); + if (IS_ERR(segment_ptr)) return -EFAULT; - table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN); - table = table + ((address >> 31) & 0x7ff); - if (unlikely(*table & _REGION_ENTRY_INV)) - return -EFAULT; - table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN); - table = table + ((address >> 20) & 0x7ff); - /* Convert the gmap address to an mm address. */ - segment = *table; - if (likely(!(segment & _SEGMENT_ENTRY_INV))) { + segment = *segment_ptr; + if (!(segment & _SEGMENT_ENTRY_INV)) { page = pfn_to_page(segment >> PAGE_SHIFT); mp = (struct gmap_pgtable *) page->index; return mp->vmaddr | (address & ~PMD_MASK); } else if (segment & _SEGMENT_ENTRY_RO) { + mm = gmap->mm; vmaddr = segment & _SEGMENT_ENTRY_ORIGIN; vma = find_vma(mm, vmaddr); if (!vma || vma->vm_start > vmaddr) @@ -441,12 +504,12 @@ unsigned long __gmap_fault(unsigned long address, struct gmap *gmap) /* Link gmap segment table entry location to page table. */ page = pmd_page(*pmd); mp = (struct gmap_pgtable *) page->index; - rmap->entry = table; + rmap->entry = segment_ptr; spin_lock(&mm->page_table_lock); list_add(&rmap->list, &mp->mapper); spin_unlock(&mm->page_table_lock); /* Set gmap segment table entry to page table. */ - *table = pmd_val(*pmd) & PAGE_MASK; + *segment_ptr = pmd_val(*pmd) & PAGE_MASK; return vmaddr | (address & ~PMD_MASK); } return -EFAULT; -- cgit v1.2.3-70-g09d2