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Bug-fixes: 

- Fix balloon driver for auto-translate guests (PVHVM, ARM) to not use
    scratch pages.
  - Fix block API header for ARM32 and ARM64 to have proper layout
  - On ARM when mapping guests, stick on PTE_SPECIAL
  - When using SWIOTLB under ARM, don't call swiotlb functions twice
  - When unmapping guests memory and if we fail, don't return pages which
    failed to be unmapped.
  - Grant driver was using the wrong address on ARM.
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Merge tag 'stable/for-linus-3.13-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull Xen bugfixes from Konrad Rzeszutek Wilk:
 - Fix balloon driver for auto-translate guests (PVHVM, ARM) to not use
   scratch pages.
 - Fix block API header for ARM32 and ARM64 to have proper layout
 - On ARM when mapping guests, stick on PTE_SPECIAL
 - When using SWIOTLB under ARM, don't call swiotlb functions twice
 - When unmapping guests memory and if we fail, don't return pages which
   failed to be unmapped.
 - Grant driver was using the wrong address on ARM.

* tag 'stable/for-linus-3.13-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/balloon: Seperate the auto-translate logic properly (v2)
  xen/block: Correctly define structures in public headers on ARM32 and ARM64
  arm: xen: foreign mapping PTEs are special.
  xen/arm64: do not call the swiotlb functions twice
  xen: privcmd: do not return pages which we have failed to unmap
  XEN: Grant table address, xen_hvm_resume_frames, is a phys_addr not a pfn
This commit is contained in:
Linus Torvalds 2013-12-20 09:34:54 -08:00
parent 5263f0a880 c1d15f5c8b
commit 4203d0eb3a
6 changed files with 51 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/arm/xen/enlighten.c
View File

@ -96,7 +96,7 @@ static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
struct remap_data *info = data;
struct page *page = info->pages[info->index++];
unsigned long pfn = page_to_pfn(page);
pte_t pte = pfn_pte(pfn, info->prot);
pte_t pte = pte_mkspecial(pfn_pte(pfn, info->prot));
if (map_foreign_page(pfn, info->fgmfn, info->domid))
return -EFAULT;
@ -224,10 +224,10 @@ static int __init xen_guest_init(void)
}
if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res))
return 0;
xen_hvm_resume_frames = res.start >> PAGE_SHIFT;
xen_hvm_resume_frames = res.start;
xen_events_irq = irq_of_parse_and_map(node, 0);
pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n",
version, xen_events_irq, xen_hvm_resume_frames);
version, xen_events_irq, (xen_hvm_resume_frames >> PAGE_SHIFT));
xen_domain_type = XEN_HVM_DOMAIN;
xen_setup_features();

4
arch/arm64/include/asm/xen/page-coherent.h
View File

@ -23,25 +23,21 @@ static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
unsigned long offset, size_t size, enum dma_data_direction dir,
struct dma_attrs *attrs)
{
__generic_dma_ops(hwdev)->map_page(hwdev, page, offset, size, dir, attrs);
}
static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
size_t size, enum dma_data_direction dir,
struct dma_attrs *attrs)
{
__generic_dma_ops(hwdev)->unmap_page(hwdev, handle, size, dir, attrs);
}
static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
dma_addr_t handle, size_t size, enum dma_data_direction dir)
{
__generic_dma_ops(hwdev)->sync_single_for_cpu(hwdev, handle, size, dir);
}
static inline void xen_dma_sync_single_for_device(struct device *hwdev,
dma_addr_t handle, size_t size, enum dma_data_direction dir)
{
__generic_dma_ops(hwdev)->sync_single_for_device(hwdev, handle, size, dir);
}
#endif /* _ASM_ARM64_XEN_PAGE_COHERENT_H */

63
drivers/xen/balloon.c
View File

@ -350,17 +350,19 @@ static enum bp_state increase_reservation(unsigned long nr_pages)
pfn = page_to_pfn(page);
set_phys_to_machine(pfn, frame_list[i]);
#ifdef CONFIG_XEN_HAVE_PVMMU
/* Link back into the page tables if not highmem. */
if (xen_pv_domain() && !PageHighMem(page)) {
int ret;
ret = HYPERVISOR_update_va_mapping(
(unsigned long)__va(pfn << PAGE_SHIFT),
mfn_pte(frame_list[i], PAGE_KERNEL),
0);
BUG_ON(ret);
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
set_phys_to_machine(pfn, frame_list[i]);
/* Link back into the page tables if not highmem. */
if (!PageHighMem(page)) {
int ret;
ret = HYPERVISOR_update_va_mapping(
(unsigned long)__va(pfn << PAGE_SHIFT),
mfn_pte(frame_list[i], PAGE_KERNEL),
0);
BUG_ON(ret);
}
}
#endif
@ -378,7 +380,6 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
enum bp_state state = BP_DONE;
unsigned long pfn, i;
struct page *page;
struct page *scratch_page;
int ret;
struct xen_memory_reservation reservation = {
.address_bits = 0,
@ -411,27 +412,29 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
scrub_page(page);
#ifdef CONFIG_XEN_HAVE_PVMMU
/*
* Ballooned out frames are effectively replaced with
* a scratch frame. Ensure direct mappings and the
* p2m are consistent.
*/
scratch_page = get_balloon_scratch_page();
#ifdef CONFIG_XEN_HAVE_PVMMU
if (xen_pv_domain() && !PageHighMem(page)) {
ret = HYPERVISOR_update_va_mapping(
(unsigned long)__va(pfn << PAGE_SHIFT),
pfn_pte(page_to_pfn(scratch_page),
PAGE_KERNEL_RO), 0);
BUG_ON(ret);
}
#endif
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
unsigned long p;
struct page *scratch_page = get_balloon_scratch_page();
if (!PageHighMem(page)) {
ret = HYPERVISOR_update_va_mapping(
(unsigned long)__va(pfn << PAGE_SHIFT),
pfn_pte(page_to_pfn(scratch_page),
PAGE_KERNEL_RO), 0);
BUG_ON(ret);
}
p = page_to_pfn(scratch_page);
__set_phys_to_machine(pfn, pfn_to_mfn(p));
put_balloon_scratch_page();
}
put_balloon_scratch_page();
#endif
balloon_append(pfn_to_page(pfn));
}
@ -627,15 +630,17 @@ static int __init balloon_init(void)
if (!xen_domain())
return -ENODEV;
for_each_online_cpu(cpu)
{
per_cpu(balloon_scratch_page, cpu) = alloc_page(GFP_KERNEL);
if (per_cpu(balloon_scratch_page, cpu) == NULL) {
pr_warn("Failed to allocate balloon_scratch_page for cpu %d\n", cpu);
return -ENOMEM;
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
for_each_online_cpu(cpu)
{
per_cpu(balloon_scratch_page, cpu) = alloc_page(GFP_KERNEL);
if (per_cpu(balloon_scratch_page, cpu) == NULL) {
pr_warn("Failed to allocate balloon_scratch_page for cpu %d\n", cpu);
return -ENOMEM;
}
}
register_cpu_notifier(&balloon_cpu_notifier);
}
register_cpu_notifier(&balloon_cpu_notifier);
pr_info("Initialising balloon driver\n");

3
drivers/xen/grant-table.c
View File

@ -1176,7 +1176,8 @@ static int gnttab_setup(void)
gnttab_shared.addr = xen_remap(xen_hvm_resume_frames,
PAGE_SIZE * max_nr_gframes);
if (gnttab_shared.addr == NULL) {
pr_warn("Failed to ioremap gnttab share frames!\n");
pr_warn("Failed to ioremap gnttab share frames (addr=0x%08lx)!\n",
xen_hvm_resume_frames);
return -ENOMEM;
}
}

9
drivers/xen/privcmd.c
View File

@ -533,12 +533,17 @@ static void privcmd_close(struct vm_area_struct *vma)
{
struct page **pages = vma->vm_private_data;
int numpgs = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
int rc;
if (!xen_feature(XENFEAT_auto_translated_physmap) || !numpgs || !pages)
return;
xen_unmap_domain_mfn_range(vma, numpgs, pages);
free_xenballooned_pages(numpgs, pages);
rc = xen_unmap_domain_mfn_range(vma, numpgs, pages);
if (rc == 0)
free_xenballooned_pages(numpgs, pages);
else
pr_crit("unable to unmap MFN range: leaking %d pages. rc=%d\n",
numpgs, rc);
kfree(pages);
}

10
include/xen/interface/io/blkif.h
View File

@ -146,7 +146,7 @@ struct blkif_request_segment_aligned {
struct blkif_request_rw {
uint8_t nr_segments; /* number of segments */
blkif_vdev_t handle; /* only for read/write requests */
#ifdef CONFIG_X86_64
#ifndef CONFIG_X86_32
uint32_t _pad1; /* offsetof(blkif_request,u.rw.id) == 8 */
#endif
uint64_t id; /* private guest value, echoed in resp */
@ -163,7 +163,7 @@ struct blkif_request_discard {
uint8_t flag; /* BLKIF_DISCARD_SECURE or zero. */
#define BLKIF_DISCARD_SECURE (1<<0) /* ignored if discard-secure=0 */
blkif_vdev_t _pad1; /* only for read/write requests */
#ifdef CONFIG_X86_64
#ifndef CONFIG_X86_32
uint32_t _pad2; /* offsetof(blkif_req..,u.discard.id)==8*/
#endif
uint64_t id; /* private guest value, echoed in resp */
@ -175,7 +175,7 @@ struct blkif_request_discard {
struct blkif_request_other {
uint8_t _pad1;
blkif_vdev_t _pad2; /* only for read/write requests */
#ifdef CONFIG_X86_64
#ifndef CONFIG_X86_32
uint32_t _pad3; /* offsetof(blkif_req..,u.other.id)==8*/
#endif
uint64_t id; /* private guest value, echoed in resp */
@ -184,7 +184,7 @@ struct blkif_request_other {
struct blkif_request_indirect {
uint8_t indirect_op;
uint16_t nr_segments;
#ifdef CONFIG_X86_64
#ifndef CONFIG_X86_32
uint32_t _pad1; /* offsetof(blkif_...,u.indirect.id) == 8 */
#endif
uint64_t id;
@ -192,7 +192,7 @@ struct blkif_request_indirect {
blkif_vdev_t handle;
uint16_t _pad2;
grant_ref_t indirect_grefs[BLKIF_MAX_INDIRECT_PAGES_PER_REQUEST];
#ifdef CONFIG_X86_64
#ifndef CONFIG_X86_32
uint32_t _pad3; /* make it 64 byte aligned */
#else
uint64_t _pad3; /* make it 64 byte aligned */