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Merge branches 'upstream/xenfs' and 'upstream/core' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen 

* 'upstream/xenfs' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen:
  xen/privcmd: make privcmd visible in domU
  xen/privcmd: move remap_domain_mfn_range() to core xen code and export.
  privcmd: MMAPBATCH: Fix error handling/reporting
  xenbus: export xen_store_interface for xenfs
  xen/privcmd: make sure vma is ours before doing anything to it
  xen/privcmd: print SIGBUS faults
  xen/xenfs: set_page_dirty is supposed to return true if it dirties
  xen/privcmd: create address space to allow writable mmaps
  xen: add privcmd driver
  xen: add variable hypercall caller
  xen: add xen_set_domain_pte()
  xen: add /proc/xen/xsd_{kva,port} to xenfs

* 'upstream/core' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen: (29 commits)
  xen: include xen/xen.h for definition of xen_initial_domain()
  xen: use host E820 map for dom0
  xen: correctly rebuild mfn list list after migration.
  xen: improvements to VIRQ_DEBUG output
  xen: set up IRQ before binding virq to evtchn
  xen: ensure that all event channels start off bound to VCPU 0
  xen/hvc: only notify if we actually sent something
  xen: don't add extra_pages for RAM after mem_end
  xen: add support for PAT
  xen: make sure xen_max_p2m_pfn is up to date
  xen: limit extra memory to a certain ratio of base
  xen: add extra pages for E820 RAM regions, even if beyond mem_end
  xen: make sure xen_extra_mem_start is beyond all non-RAM e820
  xen: implement "extra" memory to reserve space for pages not present at boot
  xen: Use host-provided E820 map
  xen: don't map missing memory
  xen: defer building p2m mfn structures until kernel is mapped
  xen: add return value to set_phys_to_machine()
  xen: convert p2m to a 3 level tree
  xen: make install_p2mtop_page() static
  ...

Fix up trivial conflict in arch/x86/xen/mmu.c, and fix the use of
'reserve_early()' - in the new memblock world order it is now
'memblock_x86_reserve_range()' instead. Pointed out by Jeremy.
This commit is contained in:
Linus Torvalds 2010-10-26 18:20:19 -07:00
parent 426e1f5cec 9387377eb7 45263cb099
commit 520045db94
20 changed files with 1334 additions and 139 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
arch/x86/include/asm/xen/hypercall.h
View File

@ -200,6 +200,23 @@ extern struct { char _entry[32]; } hypercall_page[];
(type)__res; \
})
static inline long
privcmd_call(unsigned call,
unsigned long a1, unsigned long a2,
unsigned long a3, unsigned long a4,
unsigned long a5)
{
__HYPERCALL_DECLS;
__HYPERCALL_5ARG(a1, a2, a3, a4, a5);
asm volatile("call *%[call]"
: __HYPERCALL_5PARAM
: [call] "a" (&hypercall_page[call])
: __HYPERCALL_CLOBBER5);
return (long)__res;
}
static inline int
HYPERVISOR_set_trap_table(struct trap_info *table)
{

12
arch/x86/include/asm/xen/page.h
View File

@ -37,14 +37,21 @@ typedef struct xpaddr {
extern unsigned long get_phys_to_machine(unsigned long pfn);
extern void set_phys_to_machine(unsigned long pfn, unsigned long mfn);
extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn);
static inline unsigned long pfn_to_mfn(unsigned long pfn)
{
unsigned long mfn;
if (xen_feature(XENFEAT_auto_translated_physmap))
return pfn;
return get_phys_to_machine(pfn) & ~FOREIGN_FRAME_BIT;
mfn = get_phys_to_machine(pfn);
if (mfn != INVALID_P2M_ENTRY)
mfn &= ~FOREIGN_FRAME_BIT;
return mfn;
}
static inline int phys_to_machine_mapping_valid(unsigned long pfn)
@ -159,6 +166,7 @@ static inline pte_t __pte_ma(pteval_t x)
#define pgd_val_ma(x) ((x).pgd)
void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid);
xmaddr_t arbitrary_virt_to_machine(void *address);
unsigned long arbitrary_virt_to_mfn(void *vaddr);

11
arch/x86/xen/Kconfig
View File

@ -19,15 +19,12 @@ config XEN_PVHVM
depends on X86_LOCAL_APIC
config XEN_MAX_DOMAIN_MEMORY
int "Maximum allowed size of a domain in gigabytes"
default 8 if X86_32
default 32 if X86_64
int
default 128
depends on XEN
help
The pseudo-physical to machine address array is sized
according to the maximum possible memory size of a Xen
domain. This array uses 1 page per gigabyte, so there's no
need to be too stingy here.
This only affects the sizing of some bss arrays, the unused
portions of which are freed.
config XEN_SAVE_RESTORE
bool

16
arch/x86/xen/enlighten.c
View File

@ -136,9 +136,6 @@ static void xen_vcpu_setup(int cpu)
info.mfn = arbitrary_virt_to_mfn(vcpup);
info.offset = offset_in_page(vcpup);
printk(KERN_DEBUG "trying to map vcpu_info %d at %p, mfn %llx, offset %d\n",
cpu, vcpup, info.mfn, info.offset);
/* Check to see if the hypervisor will put the vcpu_info
structure where we want it, which allows direct access via
a percpu-variable. */
@ -152,9 +149,6 @@ static void xen_vcpu_setup(int cpu)
/* This cpu is using the registered vcpu info, even if
later ones fail to. */
per_cpu(xen_vcpu, cpu) = vcpup;
printk(KERN_DEBUG "cpu %d using vcpu_info at %p\n",
cpu, vcpup);
}
}
@ -836,6 +830,11 @@ static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high)
Xen console noise. */
break;
case MSR_IA32_CR_PAT:
if (smp_processor_id() == 0)
xen_set_pat(((u64)high << 32) | low);
break;
default:
ret = native_write_msr_safe(msr, low, high);
}
@ -874,8 +873,6 @@ void xen_setup_vcpu_info_placement(void)
/* xen_vcpu_setup managed to place the vcpu_info within the
percpu area for all cpus, so make use of it */
if (have_vcpu_info_placement) {
printk(KERN_INFO "Xen: using vcpu_info placement\n");
pv_irq_ops.save_fl = __PV_IS_CALLEE_SAVE(xen_save_fl_direct);
pv_irq_ops.restore_fl = __PV_IS_CALLEE_SAVE(xen_restore_fl_direct);
pv_irq_ops.irq_disable = __PV_IS_CALLEE_SAVE(xen_irq_disable_direct);
@ -1189,6 +1186,9 @@ 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);
/* Allocate and initialize top and mid mfn levels for p2m structure */
xen_build_mfn_list_list();
init_mm.pgd = pgd;
/* keep using Xen gdt for now; no urgent need to change it */

507
arch/x86/xen/mmu.c
View File

@ -57,6 +57,7 @@
#include <asm/linkage.h>
#include <asm/page.h>
#include <asm/init.h>
#include <asm/pat.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/hypervisor.h>
@ -140,7 +141,8 @@ static inline void check_zero(void)
* large enough to allocate page table pages to allocate the rest.
* Each page can map 2MB.
*/
static pte_t level1_ident_pgt[PTRS_PER_PTE * 4] __page_aligned_bss;
#define LEVEL1_IDENT_ENTRIES (PTRS_PER_PTE * 4)
static RESERVE_BRK_ARRAY(pte_t, level1_ident_pgt, LEVEL1_IDENT_ENTRIES);
#ifdef CONFIG_X86_64
/* l3 pud for userspace vsyscall mapping */
@ -171,49 +173,182 @@ DEFINE_PER_CPU(unsigned long, xen_current_cr3); /* actual vcpu cr3 */
*/
#define USER_LIMIT ((STACK_TOP_MAX + PGDIR_SIZE - 1) & PGDIR_MASK)
/*
* Xen leaves the responsibility for maintaining p2m mappings to the
* guests themselves, but it must also access and update the p2m array
* during suspend/resume when all the pages are reallocated.
*
* The p2m table is logically a flat array, but we implement it as a
* three-level tree to allow the address space to be sparse.
*
* Xen
* |
* p2m_top p2m_top_mfn
* / \ / \
* p2m_mid p2m_mid p2m_mid_mfn p2m_mid_mfn
* / \ / \ / /
* p2m p2m p2m p2m p2m p2m p2m ...
*
* The p2m_mid_mfn pages are mapped by p2m_top_mfn_p.
*
* The p2m_top and p2m_top_mfn levels are limited to 1 page, so the
* maximum representable pseudo-physical address space is:
* P2M_TOP_PER_PAGE * P2M_MID_PER_PAGE * P2M_PER_PAGE pages
*
* P2M_PER_PAGE depends on the architecture, as a mfn is always
* unsigned long (8 bytes on 64-bit, 4 bytes on 32), leading to
* 512 and 1024 entries respectively.
*/
#define P2M_ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
#define TOP_ENTRIES (MAX_DOMAIN_PAGES / P2M_ENTRIES_PER_PAGE)
unsigned long xen_max_p2m_pfn __read_mostly;
/* Placeholder for holes in the address space */
static unsigned long p2m_missing[P2M_ENTRIES_PER_PAGE] __page_aligned_data =
{ [ 0 ... P2M_ENTRIES_PER_PAGE-1 ] = ~0UL };
#define P2M_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
#define P2M_MID_PER_PAGE (PAGE_SIZE / sizeof(unsigned long *))
#define P2M_TOP_PER_PAGE (PAGE_SIZE / sizeof(unsigned long **))
/* Array of pointers to pages containing p2m entries */
static unsigned long *p2m_top[TOP_ENTRIES] __page_aligned_data =
{ [ 0 ... TOP_ENTRIES - 1] = &p2m_missing[0] };
#define MAX_P2M_PFN (P2M_TOP_PER_PAGE * P2M_MID_PER_PAGE * P2M_PER_PAGE)
/* Arrays of p2m arrays expressed in mfns used for save/restore */
static unsigned long p2m_top_mfn[TOP_ENTRIES] __page_aligned_bss;
/* Placeholders for holes in the address space */
static RESERVE_BRK_ARRAY(unsigned long, p2m_missing, P2M_PER_PAGE);
static RESERVE_BRK_ARRAY(unsigned long *, p2m_mid_missing, P2M_MID_PER_PAGE);
static RESERVE_BRK_ARRAY(unsigned long, p2m_mid_missing_mfn, P2M_MID_PER_PAGE);
static unsigned long p2m_top_mfn_list[TOP_ENTRIES / P2M_ENTRIES_PER_PAGE]
__page_aligned_bss;
static RESERVE_BRK_ARRAY(unsigned long **, p2m_top, P2M_TOP_PER_PAGE);
static RESERVE_BRK_ARRAY(unsigned long, p2m_top_mfn, P2M_TOP_PER_PAGE);
static RESERVE_BRK_ARRAY(unsigned long *, p2m_top_mfn_p, P2M_TOP_PER_PAGE);
RESERVE_BRK(p2m_mid, PAGE_SIZE * (MAX_DOMAIN_PAGES / (P2M_PER_PAGE * P2M_MID_PER_PAGE)));
RESERVE_BRK(p2m_mid_mfn, PAGE_SIZE * (MAX_DOMAIN_PAGES / (P2M_PER_PAGE * P2M_MID_PER_PAGE)));
static inline unsigned p2m_top_index(unsigned long pfn)
{
BUG_ON(pfn >= MAX_DOMAIN_PAGES);
return pfn / P2M_ENTRIES_PER_PAGE;
BUG_ON(pfn >= MAX_P2M_PFN);
return pfn / (P2M_MID_PER_PAGE * P2M_PER_PAGE);
}
static inline unsigned p2m_mid_index(unsigned long pfn)
{
return (pfn / P2M_PER_PAGE) % P2M_MID_PER_PAGE;
}
static inline unsigned p2m_index(unsigned long pfn)
{
return pfn % P2M_ENTRIES_PER_PAGE;
return pfn % P2M_PER_PAGE;
}
/* Build the parallel p2m_top_mfn structures */
static void p2m_top_init(unsigned long ***top)
{
unsigned i;
for (i = 0; i < P2M_TOP_PER_PAGE; i++)
top[i] = p2m_mid_missing;
}
static void p2m_top_mfn_init(unsigned long *top)
{
unsigned i;
for (i = 0; i < P2M_TOP_PER_PAGE; i++)
top[i] = virt_to_mfn(p2m_mid_missing_mfn);
}
static void p2m_top_mfn_p_init(unsigned long **top)
{
unsigned i;
for (i = 0; i < P2M_TOP_PER_PAGE; i++)
top[i] = p2m_mid_missing_mfn;
}
static void p2m_mid_init(unsigned long **mid)
{
unsigned i;
for (i = 0; i < P2M_MID_PER_PAGE; i++)
mid[i] = p2m_missing;
}
static void p2m_mid_mfn_init(unsigned long *mid)
{
unsigned i;
for (i = 0; i < P2M_MID_PER_PAGE; i++)
mid[i] = virt_to_mfn(p2m_missing);
}
static void p2m_init(unsigned long *p2m)
{
unsigned i;
for (i = 0; i < P2M_MID_PER_PAGE; i++)
p2m[i] = INVALID_P2M_ENTRY;
}
/*
* Build the parallel p2m_top_mfn and p2m_mid_mfn structures
*
* This is called both at boot time, and after resuming from suspend:
* - At boot time we're called very early, and must use extend_brk()
* to allocate memory.
*
* - After resume we're called from within stop_machine, but the mfn
* tree should alreay be completely allocated.
*/
void xen_build_mfn_list_list(void)
{
unsigned pfn, idx;
unsigned long pfn;
for (pfn = 0; pfn < MAX_DOMAIN_PAGES; pfn += P2M_ENTRIES_PER_PAGE) {
unsigned topidx = p2m_top_index(pfn);
/* Pre-initialize p2m_top_mfn to be completely missing */
if (p2m_top_mfn == NULL) {
p2m_mid_missing_mfn = extend_brk(PAGE_SIZE, PAGE_SIZE);
p2m_mid_mfn_init(p2m_mid_missing_mfn);
p2m_top_mfn[topidx] = virt_to_mfn(p2m_top[topidx]);
p2m_top_mfn_p = extend_brk(PAGE_SIZE, PAGE_SIZE);
p2m_top_mfn_p_init(p2m_top_mfn_p);
p2m_top_mfn = extend_brk(PAGE_SIZE, PAGE_SIZE);
p2m_top_mfn_init(p2m_top_mfn);
} else {
/* Reinitialise, mfn's all change after migration */
p2m_mid_mfn_init(p2m_mid_missing_mfn);
}
for (idx = 0; idx < ARRAY_SIZE(p2m_top_mfn_list); idx++) {
unsigned topidx = idx * P2M_ENTRIES_PER_PAGE;
p2m_top_mfn_list[idx] = virt_to_mfn(&p2m_top_mfn[topidx]);
for (pfn = 0; pfn < xen_max_p2m_pfn; pfn += P2M_PER_PAGE) {
unsigned topidx = p2m_top_index(pfn);
unsigned mididx = p2m_mid_index(pfn);
unsigned long **mid;
unsigned long *mid_mfn_p;
mid = p2m_top[topidx];
mid_mfn_p = p2m_top_mfn_p[topidx];
/* Don't bother allocating any mfn mid levels if
* they're just missing, just update the stored mfn,
* since all could have changed over a migrate.
*/
if (mid == p2m_mid_missing) {
BUG_ON(mididx);
BUG_ON(mid_mfn_p != p2m_mid_missing_mfn);
p2m_top_mfn[topidx] = virt_to_mfn(p2m_mid_missing_mfn);
pfn += (P2M_MID_PER_PAGE - 1) * P2M_PER_PAGE;
continue;
}
if (mid_mfn_p == p2m_mid_missing_mfn) {
/*
* XXX boot-time only! We should never find
* missing parts of the mfn tree after
* runtime. extend_brk() will BUG if we call
* it too late.
*/
mid_mfn_p = extend_brk(PAGE_SIZE, PAGE_SIZE);
p2m_mid_mfn_init(mid_mfn_p);
p2m_top_mfn_p[topidx] = mid_mfn_p;
}
p2m_top_mfn[topidx] = virt_to_mfn(mid_mfn_p);
mid_mfn_p[mididx] = virt_to_mfn(mid[mididx]);
}
}
@ -222,8 +357,8 @@ void xen_setup_mfn_list_list(void)
BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info);
HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list =
virt_to_mfn(p2m_top_mfn_list);
HYPERVISOR_shared_info->arch.max_pfn = xen_start_info->nr_pages;
virt_to_mfn(p2m_top_mfn);
HYPERVISOR_shared_info->arch.max_pfn = xen_max_p2m_pfn;
}
/* Set up p2m_top to point to the domain-builder provided p2m pages */
@ -231,98 +366,176 @@ void __init xen_build_dynamic_phys_to_machine(void)
{
unsigned long *mfn_list = (unsigned long *)xen_start_info->mfn_list;
unsigned long max_pfn = min(MAX_DOMAIN_PAGES, xen_start_info->nr_pages);
unsigned pfn;
unsigned long pfn;
for (pfn = 0; pfn < max_pfn; pfn += P2M_ENTRIES_PER_PAGE) {
xen_max_p2m_pfn = max_pfn;
p2m_missing = extend_brk(PAGE_SIZE, PAGE_SIZE);
p2m_init(p2m_missing);
p2m_mid_missing = extend_brk(PAGE_SIZE, PAGE_SIZE);
p2m_mid_init(p2m_mid_missing);
p2m_top = extend_brk(PAGE_SIZE, PAGE_SIZE);
p2m_top_init(p2m_top);
/*
* The domain builder gives us a pre-constructed p2m array in
* mfn_list for all the pages initially given to us, so we just
* need to graft that into our tree structure.
*/
for (pfn = 0; pfn < max_pfn; pfn += P2M_PER_PAGE) {
unsigned topidx = p2m_top_index(pfn);
unsigned mididx = p2m_mid_index(pfn);
p2m_top[topidx] = &mfn_list[pfn];
if (p2m_top[topidx] == p2m_mid_missing) {
unsigned long **mid = extend_brk(PAGE_SIZE, PAGE_SIZE);
p2m_mid_init(mid);
p2m_top[topidx] = mid;
}
p2m_top[topidx][mididx] = &mfn_list[pfn];
}
xen_build_mfn_list_list();
}
unsigned long get_phys_to_machine(unsigned long pfn)
{
unsigned topidx, idx;
unsigned topidx, mididx, idx;
if (unlikely(pfn >= MAX_DOMAIN_PAGES))
if (unlikely(pfn >= MAX_P2M_PFN))
return INVALID_P2M_ENTRY;
topidx = p2m_top_index(pfn);
mididx = p2m_mid_index(pfn);
idx = p2m_index(pfn);
return p2m_top[topidx][idx];
return p2m_top[topidx][mididx][idx];
}
EXPORT_SYMBOL_GPL(get_phys_to_machine);
/* install a new p2m_top page */
bool install_p2mtop_page(unsigned long pfn, unsigned long *p)
static void *alloc_p2m_page(void)
{
unsigned topidx = p2m_top_index(pfn);
unsigned long **pfnp, *mfnp;
unsigned i;
pfnp = &p2m_top[topidx];
mfnp = &p2m_top_mfn[topidx];
for (i = 0; i < P2M_ENTRIES_PER_PAGE; i++)
p[i] = INVALID_P2M_ENTRY;
if (cmpxchg(pfnp, p2m_missing, p) == p2m_missing) {
*mfnp = virt_to_mfn(p);
return true;
}
return false;
return (void *)__get_free_page(GFP_KERNEL | __GFP_REPEAT);
}
static void alloc_p2m(unsigned long pfn)
static void free_p2m_page(void *p)
{
unsigned long *p;
free_page((unsigned long)p);
}
p = (void *)__get_free_page(GFP_KERNEL | __GFP_NOFAIL);
BUG_ON(p == NULL);
/*
* Fully allocate the p2m structure for a given pfn. We need to check
* that both the top and mid levels are allocated, and make sure the
* parallel mfn tree is kept in sync. We may race with other cpus, so
* the new pages are installed with cmpxchg; if we lose the race then
* simply free the page we allocated and use the one that's there.
*/
static bool alloc_p2m(unsigned long pfn)
{
unsigned topidx, mididx;
unsigned long ***top_p, **mid;
unsigned long *top_mfn_p, *mid_mfn;
if (!install_p2mtop_page(pfn, p))
free_page((unsigned long)p);
topidx = p2m_top_index(pfn);
mididx = p2m_mid_index(pfn);
top_p = &p2m_top[topidx];
mid = *top_p;
if (mid == p2m_mid_missing) {
/* Mid level is missing, allocate a new one */
mid = alloc_p2m_page();
if (!mid)
return false;
p2m_mid_init(mid);
if (cmpxchg(top_p, p2m_mid_missing, mid) != p2m_mid_missing)
free_p2m_page(mid);
}
top_mfn_p = &p2m_top_mfn[topidx];
mid_mfn = p2m_top_mfn_p[topidx];
BUG_ON(virt_to_mfn(mid_mfn) != *top_mfn_p);
if (mid_mfn == p2m_mid_missing_mfn) {
/* Separately check the mid mfn level */
unsigned long missing_mfn;
unsigned long mid_mfn_mfn;
mid_mfn = alloc_p2m_page();
if (!mid_mfn)
return false;
p2m_mid_mfn_init(mid_mfn);
missing_mfn = virt_to_mfn(p2m_mid_missing_mfn);
mid_mfn_mfn = virt_to_mfn(mid_mfn);
if (cmpxchg(top_mfn_p, missing_mfn, mid_mfn_mfn) != missing_mfn)
free_p2m_page(mid_mfn);
else
p2m_top_mfn_p[topidx] = mid_mfn;
}
if (p2m_top[topidx][mididx] == p2m_missing) {
/* p2m leaf page is missing */
unsigned long *p2m;
p2m = alloc_p2m_page();
if (!p2m)
return false;
p2m_init(p2m);
if (cmpxchg(&mid[mididx], p2m_missing, p2m) != p2m_missing)
free_p2m_page(p2m);
else
mid_mfn[mididx] = virt_to_mfn(p2m);
}
return true;
}
/* Try to install p2m mapping; fail if intermediate bits missing */
bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn)
{
unsigned topidx, idx;
unsigned topidx, mididx, idx;
if (unlikely(pfn >= MAX_DOMAIN_PAGES)) {
if (unlikely(pfn >= MAX_P2M_PFN)) {
BUG_ON(mfn != INVALID_P2M_ENTRY);
return true;
}
topidx = p2m_top_index(pfn);
if (p2m_top[topidx] == p2m_missing) {
if (mfn == INVALID_P2M_ENTRY)
return true;
return false;
}
mididx = p2m_mid_index(pfn);
idx = p2m_index(pfn);
p2m_top[topidx][idx] = mfn;
if (p2m_top[topidx][mididx] == p2m_missing)
return mfn == INVALID_P2M_ENTRY;
p2m_top[topidx][mididx][idx] = mfn;
return true;
}
void set_phys_to_machine(unsigned long pfn, unsigned long mfn)
bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
{
if (unlikely(xen_feature(XENFEAT_auto_translated_physmap))) {
BUG_ON(pfn != mfn && mfn != INVALID_P2M_ENTRY);
return;
return true;
}
if (unlikely(!__set_phys_to_machine(pfn, mfn))) {
alloc_p2m(pfn);
if (!alloc_p2m(pfn))
return false;
if (!__set_phys_to_machine(pfn, mfn))
BUG();
return false;
}
return true;
}
unsigned long arbitrary_virt_to_mfn(void *vaddr)
@ -399,7 +612,7 @@ static bool xen_iomap_pte(pte_t pte)
return pte_flags(pte) & _PAGE_IOMAP;
}
static void xen_set_iomap_pte(pte_t *ptep, pte_t pteval)
void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid)
{
struct multicall_space mcs;
struct mmu_update *u;
@ -411,10 +624,16 @@ static void xen_set_iomap_pte(pte_t *ptep, pte_t pteval)
u->ptr = arbitrary_virt_to_machine(ptep).maddr;
u->val = pte_val_ma(pteval);
MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, DOMID_IO);
MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, domid);
xen_mc_issue(PARAVIRT_LAZY_MMU);
}
EXPORT_SYMBOL_GPL(xen_set_domain_pte);
static void xen_set_iomap_pte(pte_t *ptep, pte_t pteval)
{
xen_set_domain_pte(ptep, pteval, DOMID_IO);
}
static void xen_extend_mmu_update(const struct mmu_update *update)
{
@ -561,7 +780,20 @@ static pteval_t pte_pfn_to_mfn(pteval_t val)
if (val & _PAGE_PRESENT) {
unsigned long pfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
pteval_t flags = val & PTE_FLAGS_MASK;
val = ((pteval_t)pfn_to_mfn(pfn) << PAGE_SHIFT) | flags;
unsigned long mfn = pfn_to_mfn(pfn);
/*
* If there's no mfn for the pfn, then just create an
* empty non-present pte. Unfortunately this loses
* information about the original pfn, so
* pte_mfn_to_pfn is asymmetric.
*/
if (unlikely(mfn == INVALID_P2M_ENTRY)) {
mfn = 0;
flags = 0;
}
val = ((pteval_t)mfn << PAGE_SHIFT) | flags;
}
return val;
@ -583,10 +815,18 @@ static pteval_t iomap_pte(pteval_t val)
pteval_t xen_pte_val(pte_t pte)
{
if (xen_initial_domain() && (pte.pte & _PAGE_IOMAP))
return pte.pte;
pteval_t pteval = pte.pte;
return pte_mfn_to_pfn(pte.pte);
/* If this is a WC pte, convert back from Xen WC to Linux WC */
if ((pteval & (_PAGE_PAT | _PAGE_PCD | _PAGE_PWT)) == _PAGE_PAT) {
WARN_ON(!pat_enabled);
pteval = (pteval & ~_PAGE_PAT) | _PAGE_PWT;
}
if (xen_initial_domain() && (pteval & _PAGE_IOMAP))
return pteval;
return pte_mfn_to_pfn(pteval);
}
PV_CALLEE_SAVE_REGS_THUNK(xen_pte_val);
@ -596,10 +836,48 @@ pgdval_t xen_pgd_val(pgd_t pgd)
}
PV_CALLEE_SAVE_REGS_THUNK(xen_pgd_val);
/*
* Xen's PAT setup is part of its ABI, though I assume entries 6 & 7
* are reserved for now, to correspond to the Intel-reserved PAT
* types.
*
* We expect Linux's PAT set as follows:
*
* Idx PTE flags Linux Xen Default
* 0 WB WB WB
* 1 PWT WC WT WT
* 2 PCD UC- UC- UC-
* 3 PCD PWT UC UC UC
* 4 PAT WB WC WB
* 5 PAT PWT WC WP WT
* 6 PAT PCD UC- UC UC-
* 7 PAT PCD PWT UC UC UC
*/
void xen_set_pat(u64 pat)
{
/* We expect Linux to use a PAT setting of
* UC UC- WC WB (ignoring the PAT flag) */
WARN_ON(pat != 0x0007010600070106ull);
}
pte_t xen_make_pte(pteval_t pte)
{
phys_addr_t addr = (pte & PTE_PFN_MASK);
/* If Linux is trying to set a WC pte, then map to the Xen WC.
* If _PAGE_PAT is set, then it probably means it is really
* _PAGE_PSE, so avoid fiddling with the PAT mapping and hope
* things work out OK...
*
* (We should never see kernel mappings with _PAGE_PSE set,
* but we could see hugetlbfs mappings, I think.).
*/
if (pat_enabled && !WARN_ON(pte & _PAGE_PAT)) {
if ((pte & (_PAGE_PCD | _PAGE_PWT)) == _PAGE_PWT)
pte = (pte & ~(_PAGE_PCD | _PAGE_PWT)) | _PAGE_PAT;
}
/*
* Unprivileged domains are allowed to do IOMAPpings for
* PCI passthrough, but not map ISA space. The ISA
@ -1712,6 +1990,9 @@ static __init void xen_map_identity_early(pmd_t *pmd, unsigned long max_pfn)
unsigned ident_pte;
unsigned long pfn;
level1_ident_pgt = extend_brk(sizeof(pte_t) * LEVEL1_IDENT_ENTRIES,
PAGE_SIZE);
ident_pte = 0;
pfn = 0;
for (pmdidx = 0; pmdidx < PTRS_PER_PMD && pfn < max_pfn; pmdidx++) {
@ -1722,7 +2003,7 @@ static __init void xen_map_identity_early(pmd_t *pmd, unsigned long max_pfn)
pte_page = m2v(pmd[pmdidx].pmd);
else {
/* Check for free pte pages */
if (ident_pte == ARRAY_SIZE(level1_ident_pgt))
if (ident_pte == LEVEL1_IDENT_ENTRIES)
break;
pte_page = &level1_ident_pgt[ident_pte];
@ -1837,13 +2118,15 @@ __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd,
return pgd;
}
#else /* !CONFIG_X86_64 */
static pmd_t level2_kernel_pgt[PTRS_PER_PMD] __page_aligned_bss;
static RESERVE_BRK_ARRAY(pmd_t, level2_kernel_pgt, PTRS_PER_PMD);
__init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd,
unsigned long max_pfn)
{
pmd_t *kernel_pmd;
level2_kernel_pgt = extend_brk(sizeof(pmd_t *) * PTRS_PER_PMD, PAGE_SIZE);
max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->pt_base) +
xen_start_info->nr_pt_frames * PAGE_SIZE +
512*1024);
@ -2269,6 +2552,72 @@ void __init xen_hvm_init_mmu_ops(void)
}
#endif
#define REMAP_BATCH_SIZE 16
struct remap_data {
unsigned long mfn;
pgprot_t prot;
struct mmu_update *mmu_update;
};
static int remap_area_mfn_pte_fn(pte_t *ptep, pgtable_t token,
unsigned long addr, void *data)
{
struct remap_data *rmd = data;
pte_t pte = pte_mkspecial(pfn_pte(rmd->mfn++, rmd->prot));
rmd->mmu_update->ptr = arbitrary_virt_to_machine(ptep).maddr;
rmd->mmu_update->val = pte_val_ma(pte);
rmd->mmu_update++;
return 0;
}
int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
unsigned long addr,
unsigned long mfn, int nr,
pgprot_t prot, unsigned domid)
{
struct remap_data rmd;
struct mmu_update mmu_update[REMAP_BATCH_SIZE];
int batch;
unsigned long range;
int err = 0;
prot = __pgprot(pgprot_val(prot) | _PAGE_IOMAP);
vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP;
rmd.mfn = mfn;
rmd.prot = prot;
while (nr) {
batch = min(REMAP_BATCH_SIZE, nr);
range = (unsigned long)batch << PAGE_SHIFT;
rmd.mmu_update = mmu_update;
err = apply_to_page_range(vma->vm_mm, addr, range,
remap_area_mfn_pte_fn, &rmd);
if (err)
goto out;
err = -EFAULT;
if (HYPERVISOR_mmu_update(mmu_update, batch, NULL, domid) < 0)
goto out;
nr -= batch;
addr += range;
}
err = 0;
out:
flush_tlb_all();
return err;
}
EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
#ifdef CONFIG_XEN_DEBUG_FS
static struct dentry *d_mmu_debug;

1
arch/x86/xen/mmu.h
View File

@ -12,7 +12,6 @@ enum pt_level {
bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
bool install_p2mtop_page(unsigned long pfn, unsigned long *p);
void set_pte_mfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);

112
arch/x86/xen/setup.c
View File

@ -18,8 +18,10 @@
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
#include <xen/xen.h>
#include <xen/page.h>
#include <xen/interface/callback.h>
#include <xen/interface/memory.h>
#include <xen/interface/physdev.h>
#include <xen/interface/memory.h>
#include <xen/features.h>
@ -34,6 +36,39 @@ extern void xen_sysenter_target(void);
extern void xen_syscall_target(void);
extern void xen_syscall32_target(void);
/* Amount of extra memory space we add to the e820 ranges */
phys_addr_t xen_extra_mem_start, xen_extra_mem_size;
/*
* The maximum amount of extra memory compared to the base size. The
* main scaling factor is the size of struct page. At extreme ratios
* of base:extra, all the base memory can be filled with page
* structures for the extra memory, leaving no space for anything
* else.
*
* 10x seems like a reasonable balance between scaling flexibility and
* leaving a practically usable system.
*/
#define EXTRA_MEM_RATIO (10)
static __init void xen_add_extra_mem(unsigned long pages)
{
u64 size = (u64)pages * PAGE_SIZE;
u64 extra_start = xen_extra_mem_start + xen_extra_mem_size;
if (!pages)
return;
e820_add_region(extra_start, size, E820_RAM);
sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
memblock_x86_reserve_range(extra_start, extra_start + size, "XEN EXTRA");
xen_extra_mem_size += size;
xen_max_p2m_pfn = PFN_DOWN(extra_start + size);
}
static unsigned long __init xen_release_chunk(phys_addr_t start_addr,
phys_addr_t end_addr)
{
@ -105,16 +140,65 @@ static unsigned long __init xen_return_unused_memory(unsigned long max_pfn,
/**
* machine_specific_memory_setup - Hook for machine specific memory setup.
**/
char * __init xen_memory_setup(void)
{
static struct e820entry map[E820MAX] __initdata;
unsigned long max_pfn = xen_start_info->nr_pages;
unsigned long long mem_end;
int rc;
struct xen_memory_map memmap;
unsigned long extra_pages = 0;
unsigned long extra_limit;
int i;
int op;
max_pfn = min(MAX_DOMAIN_PAGES, max_pfn);
mem_end = PFN_PHYS(max_pfn);
memmap.nr_entries = E820MAX;
set_xen_guest_handle(memmap.buffer, map);
op = xen_initial_domain() ?
XENMEM_machine_memory_map :
XENMEM_memory_map;
rc = HYPERVISOR_memory_op(op, &memmap);
if (rc == -ENOSYS) {
memmap.nr_entries = 1;
map[0].addr = 0ULL;
map[0].size = mem_end;
/* 8MB slack (to balance backend allocations). */
map[0].size += 8ULL << 20;
map[0].type = E820_RAM;
rc = 0;
}
BUG_ON(rc);
e820.nr_map = 0;
xen_extra_mem_start = mem_end;
for (i = 0; i < memmap.nr_entries; i++) {
unsigned long long end = map[i].addr + map[i].size;
e820_add_region(0, PFN_PHYS((u64)max_pfn), E820_RAM);
if (map[i].type == E820_RAM) {
if (map[i].addr < mem_end && end > mem_end) {
/* Truncate region to max_mem. */
u64 delta = end - mem_end;
map[i].size -= delta;
extra_pages += PFN_DOWN(delta);
end = mem_end;
}
}
if (end > xen_extra_mem_start)
xen_extra_mem_start = end;
/* If region is non-RAM or below mem_end, add what remains */
if ((map[i].type != E820_RAM || map[i].addr < mem_end) &&
map[i].size > 0)
e820_add_region(map[i].addr, map[i].size, map[i].type);
}
/*
* Even though this is normal, usable memory under Xen, reserve
@ -136,7 +220,29 @@ char * __init xen_memory_setup(void)
sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
xen_return_unused_memory(xen_start_info->nr_pages, &e820);
extra_pages += xen_return_unused_memory(xen_start_info->nr_pages, &e820);
/*
* Clamp the amount of extra memory to a EXTRA_MEM_RATIO
* factor the base size. On non-highmem systems, the base
* size is the full initial memory allocation; on highmem it
* is limited to the max size of lowmem, so that it doesn't
* get completely filled.
*
* In principle there could be a problem in lowmem systems if
* the initial memory is also very large with respect to
* lowmem, but we won't try to deal with that here.
*/
extra_limit = min(EXTRA_MEM_RATIO * min(max_pfn, PFN_DOWN(MAXMEM)),
max_pfn + extra_pages);
if (extra_limit >= max_pfn)
extra_pages = extra_limit - max_pfn;
else
extra_pages = 0;
if (!xen_initial_domain())
xen_add_extra_mem(extra_pages);
return "Xen";
}

3
arch/x86/xen/xen-ops.h
View File

@ -30,6 +30,9 @@ 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);
extern unsigned long xen_max_p2m_pfn;
void xen_set_pat(u64);
char * __init xen_memory_setup(void);
void __init xen_arch_setup(void);

3
drivers/char/hvc_xen.c
View File

@ -74,7 +74,8 @@ static int __write_console(const char *data, int len)
wmb(); /* write ring before updating pointer */
intf->out_prod = prod;
notify_daemon();
if (sent)
notify_daemon();
return sent;
}

99
drivers/xen/events.c
View File

@ -261,7 +261,7 @@ static void init_evtchn_cpu_bindings(void)
}
#endif
memset(cpu_evtchn_mask(0), ~0, sizeof(cpu_evtchn_mask(0)));
memset(cpu_evtchn_mask(0), ~0, sizeof(struct cpu_evtchn_s));
}
static inline void clear_evtchn(int port)
@ -377,7 +377,7 @@ int bind_evtchn_to_irq(unsigned int evtchn)
irq = find_unbound_irq();
set_irq_chip_and_handler_name(irq, &xen_dynamic_chip,
handle_edge_irq, "event");
handle_fasteoi_irq, "event");
evtchn_to_irq[evtchn] = irq;
irq_info[irq] = mk_evtchn_info(evtchn);
@ -435,6 +435,11 @@ static int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
irq = per_cpu(virq_to_irq, cpu)[virq];
if (irq == -1) {
irq = find_unbound_irq();
set_irq_chip_and_handler_name(irq, &xen_percpu_chip,
handle_percpu_irq, "virq");
bind_virq.virq = virq;
bind_virq.vcpu = cpu;
if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
@ -442,11 +447,6 @@ static int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
BUG();
evtchn = bind_virq.port;
irq = find_unbound_irq();
set_irq_chip_and_handler_name(irq, &xen_percpu_chip,
handle_percpu_irq, "virq");
evtchn_to_irq[evtchn] = irq;
irq_info[irq] = mk_virq_info(evtchn, virq);
@ -578,41 +578,75 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
{
struct shared_info *sh = HYPERVISOR_shared_info;
int cpu = smp_processor_id();
unsigned long *cpu_evtchn = cpu_evtchn_mask(cpu);
int i;
unsigned long flags;
static DEFINE_SPINLOCK(debug_lock);
struct vcpu_info *v;
spin_lock_irqsave(&debug_lock, flags);
printk("vcpu %d\n ", cpu);
printk("\nvcpu %d\n ", cpu);
for_each_online_cpu(i) {
struct vcpu_info *v = per_cpu(xen_vcpu, i);
printk("%d: masked=%d pending=%d event_sel %08lx\n ", i,
(get_irq_regs() && i == cpu) ? xen_irqs_disabled(get_irq_regs()) : v->evtchn_upcall_mask,
v->evtchn_upcall_pending,
v->evtchn_pending_sel);
int pending;
v = per_cpu(xen_vcpu, i);
pending = (get_irq_regs() && i == cpu)
? xen_irqs_disabled(get_irq_regs())
: v->evtchn_upcall_mask;
printk("%d: masked=%d pending=%d event_sel %0*lx\n ", i,
pending, v->evtchn_upcall_pending,
(int)(sizeof(v->evtchn_pending_sel)*2),
v->evtchn_pending_sel);
}
printk("pending:\n ");
for(i = ARRAY_SIZE(sh->evtchn_pending)-1; i >= 0; i--)
printk("%08lx%s", sh->evtchn_pending[i],
i % 8 == 0 ? "\n " : " ");
printk("\nmasks:\n ");
for(i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
printk("%08lx%s", sh->evtchn_mask[i],
i % 8 == 0 ? "\n " : " ");
v = per_cpu(xen_vcpu, cpu);
printk("\nunmasked:\n ");
for(i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
printk("%08lx%s", sh->evtchn_pending[i] & ~sh->evtchn_mask[i],
i % 8 == 0 ? "\n " : " ");
printk("\npending:\n ");
for (i = ARRAY_SIZE(sh->evtchn_pending)-1; i >= 0; i--)
printk("%0*lx%s", (int)sizeof(sh->evtchn_pending[0])*2,
sh->evtchn_pending[i],
i % 8 == 0 ? "\n " : " ");
printk("\nglobal mask:\n ");
for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
printk("%0*lx%s",
(int)(sizeof(sh->evtchn_mask[0])*2),
sh->evtchn_mask[i],
i % 8 == 0 ? "\n " : " ");
printk("\nglobally unmasked:\n ");
for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
printk("%0*lx%s", (int)(sizeof(sh->evtchn_mask[0])*2),
sh->evtchn_pending[i] & ~sh->evtchn_mask[i],
i % 8 == 0 ? "\n " : " ");
printk("\nlocal cpu%d mask:\n ", cpu);
for (i = (NR_EVENT_CHANNELS/BITS_PER_LONG)-1; i >= 0; i--)
printk("%0*lx%s", (int)(sizeof(cpu_evtchn[0])*2),
cpu_evtchn[i],
i % 8 == 0 ? "\n " : " ");
printk("\nlocally unmasked:\n ");
for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--) {
unsigned long pending = sh->evtchn_pending[i]
& ~sh->evtchn_mask[i]
& cpu_evtchn[i];
printk("%0*lx%s", (int)(sizeof(sh->evtchn_mask[0])*2),
pending, i % 8 == 0 ? "\n " : " ");
}
printk("\npending list:\n");
for(i = 0; i < NR_EVENT_CHANNELS; i++) {
for (i = 0; i < NR_EVENT_CHANNELS; i++) {
if (sync_test_bit(i, sh->evtchn_pending)) {
printk(" %d: event %d -> irq %d\n",
int word_idx = i / BITS_PER_LONG;
printk(" %d: event %d -> irq %d%s%s%s\n",
cpu_from_evtchn(i), i,
evtchn_to_irq[i]);
evtchn_to_irq[i],
sync_test_bit(word_idx, &v->evtchn_pending_sel)
? "" : " l2-clear",
!sync_test_bit(i, sh->evtchn_mask)
? "" : " globally-masked",
sync_test_bit(i, cpu_evtchn)
? "" : " locally-masked");
}
}
@ -663,6 +697,9 @@ static void __xen_evtchn_do_upcall(void)
int irq = evtchn_to_irq[port];
struct irq_desc *desc;
mask_evtchn(port);
clear_evtchn(port);
if (irq != -1) {
desc = irq_to_desc(irq);
if (desc)
@ -800,10 +837,10 @@ static void ack_dynirq(unsigned int irq)
{
int evtchn = evtchn_from_irq(irq);
move_native_irq(irq);
move_masked_irq(irq);
if (VALID_EVTCHN(evtchn))
clear_evtchn(evtchn);
unmask_evtchn(evtchn);
}
static int retrigger_dynirq(unsigned int irq)
@ -959,7 +996,7 @@ static struct irq_chip xen_dynamic_chip __read_mostly = {
.mask = disable_dynirq,
.unmask = enable_dynirq,
.ack = ack_dynirq,
.eoi = ack_dynirq,
.set_affinity = set_affinity_irq,
.retrigger = retrigger_dynirq,
};

4
drivers/xen/xenbus/xenbus_probe.c
View File

@ -64,9 +64,11 @@
int xen_store_evtchn;
EXPORT_SYMBOL(xen_store_evtchn);
EXPORT_SYMBOL_GPL(xen_store_evtchn);
struct xenstore_domain_interface *xen_store_interface;
EXPORT_SYMBOL_GPL(xen_store_interface);
static unsigned long xen_store_mfn;
static BLOCKING_NOTIFIER_HEAD(xenstore_chain);

3
drivers/xen/xenfs/Makefile
View File

@ -1,3 +1,4 @@
obj-$(CONFIG_XENFS) += xenfs.o
xenfs-objs = super.o xenbus.o
xenfs-y = super.o xenbus.o privcmd.o
xenfs-$(CONFIG_XEN_DOM0) += xenstored.o

404
drivers/xen/xenfs/privcmd.c Normal file
View File

@ -0,0 +1,404 @@
/******************************************************************************
* privcmd.c
*
* Interface to privileged domain-0 commands.
*
* Copyright (c) 2002-2004, K A Fraser, B Dragovic
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/uaccess.h>
#include <linux/swap.h>
#include <linux/smp_lock.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/seq_file.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/tlb.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
#include <xen/xen.h>
#include <xen/privcmd.h>
#include <xen/interface/xen.h>
#include <xen/features.h>
#include <xen/page.h>
#include <xen/xen-ops.h>
#ifndef HAVE_ARCH_PRIVCMD_MMAP
static int privcmd_enforce_singleshot_mapping(struct vm_area_struct *vma);
#endif
static long privcmd_ioctl_hypercall(void __user *udata)
{
struct privcmd_hypercall hypercall;
long ret;
if (copy_from_user(&hypercall, udata, sizeof(hypercall)))
return -EFAULT;
ret = privcmd_call(hypercall.op,
hypercall.arg[0], hypercall.arg[1],
hypercall.arg[2], hypercall.arg[3],
hypercall.arg[4]);
return ret;
}
static void free_page_list(struct list_head *pages)
{
struct page *p, *n;
list_for_each_entry_safe(p, n, pages, lru)
__free_page(p);
INIT_LIST_HEAD(pages);
}
/*
* Given an array of items in userspace, return a list of pages
* containing the data. If copying fails, either because of memory
* allocation failure or a problem reading user memory, return an
* error code; its up to the caller to dispose of any partial list.
*/
static int gather_array(struct list_head *pagelist,
unsigned nelem, size_t size,
void __user *data)
{
unsigned pageidx;
void *pagedata;
int ret;
if (size > PAGE_SIZE)
return 0;
pageidx = PAGE_SIZE;
pagedata = NULL; /* quiet, gcc */
while (nelem--) {
if (pageidx > PAGE_SIZE-size) {
struct page *page = alloc_page(GFP_KERNEL);
ret = -ENOMEM;
if (page == NULL)
goto fail;
pagedata = page_address(page);
list_add_tail(&page->lru, pagelist);
pageidx = 0;
}
ret = -EFAULT;
if (copy_from_user(pagedata + pageidx, data, size))
goto fail;
data += size;
pageidx += size;
}
ret = 0;
fail:
return ret;
}
/*
* Call function "fn" on each element of the array fragmented
* over a list of pages.
*/
static int traverse_pages(unsigned nelem, size_t size,
struct list_head *pos,
int (*fn)(void *data, void *state),
void *state)
{
void *pagedata;
unsigned pageidx;
int ret = 0;
BUG_ON(size > PAGE_SIZE);
pageidx = PAGE_SIZE;
pagedata = NULL; /* hush, gcc */
while (nelem--) {
if (pageidx > PAGE_SIZE-size) {
struct page *page;
pos = pos->next;
page = list_entry(pos, struct page, lru);
pagedata = page_address(page);
pageidx = 0;
}
ret = (*fn)(pagedata + pageidx, state);
if (ret)
break;
pageidx += size;
}
return ret;
}
struct mmap_mfn_state {
unsigned long va;
struct vm_area_struct *vma;
domid_t domain;
};
static int mmap_mfn_range(void *data, void *state)
{
struct privcmd_mmap_entry *msg = data;
struct mmap_mfn_state *st = state;
struct vm_area_struct *vma = st->vma;
int rc;
/* Do not allow range to wrap the address space. */
if ((msg->npages > (LONG_MAX >> PAGE_SHIFT)) ||
((unsigned long)(msg->npages << PAGE_SHIFT) >= -st->va))
return -EINVAL;
/* Range chunks must be contiguous in va space. */
if ((msg->va != st->va) ||
((msg->va+(msg->npages<<PAGE_SHIFT)) > vma->vm_end))
return -EINVAL;
rc = xen_remap_domain_mfn_range(vma,
msg->va & PAGE_MASK,
msg->mfn, msg->npages,
vma->vm_page_prot,
st->domain);
if (rc < 0)
return rc;
st->va += msg->npages << PAGE_SHIFT;
return 0;
}
static long privcmd_ioctl_mmap(void __user *udata)
{
struct privcmd_mmap mmapcmd;
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
int rc;
LIST_HEAD(pagelist);
struct mmap_mfn_state state;
if (!xen_initial_domain())
return -EPERM;
if (copy_from_user(&mmapcmd, udata, sizeof(mmapcmd)))
return -EFAULT;
rc = gather_array(&pagelist,
mmapcmd.num, sizeof(struct privcmd_mmap_entry),
mmapcmd.entry);
if (rc || list_empty(&pagelist))
goto out;
down_write(&mm->mmap_sem);
{
struct page *page = list_first_entry(&pagelist,
struct page, lru);
struct privcmd_mmap_entry *msg = page_address(page);
vma = find_vma(mm, msg->va);
rc = -EINVAL;
if (!vma || (msg->va != vma->vm_start) ||
!privcmd_enforce_singleshot_mapping(vma))
goto out_up;
}
state.va = vma->vm_start;
state.vma = vma;
state.domain = mmapcmd.dom;
rc = traverse_pages(mmapcmd.num, sizeof(struct privcmd_mmap_entry),
&pagelist,
mmap_mfn_range, &state);
out_up:
up_write(&mm->mmap_sem);
out:
free_page_list(&pagelist);
return rc;
}
struct mmap_batch_state {
domid_t domain;
unsigned long va;
struct vm_area_struct *vma;
int err;
xen_pfn_t __user *user;
};
static int mmap_batch_fn(void *data, void *state)
{
xen_pfn_t *mfnp = data;
struct mmap_batch_state *st = state;
if (xen_remap_domain_mfn_range(st->vma, st->va & PAGE_MASK, *mfnp, 1,
st->vma->vm_page_prot, st->domain) < 0) {
*mfnp |= 0xf0000000U;
st->err++;
}
st->va += PAGE_SIZE;
return 0;
}
static int mmap_return_errors(void *data, void *state)
{
xen_pfn_t *mfnp = data;
struct mmap_batch_state *st = state;
put_user(*mfnp, st->user++);
return 0;
}
static struct vm_operations_struct privcmd_vm_ops;
static long privcmd_ioctl_mmap_batch(void __user *udata)
{
int ret;
struct privcmd_mmapbatch m;
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
unsigned long nr_pages;
LIST_HEAD(pagelist);
struct mmap_batch_state state;
if (!xen_initial_domain())
return -EPERM;
if (copy_from_user(&m, udata, sizeof(m)))
return -EFAULT;
nr_pages = m.num;
if ((m.num <= 0) || (nr_pages > (LONG_MAX >> PAGE_SHIFT)))
return -EINVAL;
ret = gather_array(&pagelist, m.num, sizeof(xen_pfn_t),
m.arr);
if (ret || list_empty(&pagelist))
goto out;
down_write(&mm->mmap_sem);
vma = find_vma(mm, m.addr);
ret = -EINVAL;
if (!vma ||
vma->vm_ops != &privcmd_vm_ops ||
(m.addr != vma->vm_start) ||
((m.addr + (nr_pages << PAGE_SHIFT)) != vma->vm_end) ||
!privcmd_enforce_singleshot_mapping(vma)) {
up_write(&mm->mmap_sem);
goto out;
}
state.domain = m.dom;
state.vma = vma;
state.va = m.addr;
state.err = 0;
ret = traverse_pages(m.num, sizeof(xen_pfn_t),
&pagelist, mmap_batch_fn, &state);
up_write(&mm->mmap_sem);
if (state.err > 0) {
ret = 0;
state.user = m.arr;
traverse_pages(m.num, sizeof(xen_pfn_t),
&pagelist,
mmap_return_errors, &state);
}
out:
free_page_list(&pagelist);
return ret;
}
static long privcmd_ioctl(struct file *file,
unsigned int cmd, unsigned long data)
{
int ret = -ENOSYS;
void __user *udata = (void __user *) data;
switch (cmd) {
case IOCTL_PRIVCMD_HYPERCALL:
ret = privcmd_ioctl_hypercall(udata);
break;
case IOCTL_PRIVCMD_MMAP:
ret = privcmd_ioctl_mmap(udata);
break;
case IOCTL_PRIVCMD_MMAPBATCH:
ret = privcmd_ioctl_mmap_batch(udata);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
#ifndef HAVE_ARCH_PRIVCMD_MMAP
static int privcmd_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
printk(KERN_DEBUG "privcmd_fault: vma=%p %lx-%lx, pgoff=%lx, uv=%p\n",
vma, vma->vm_start, vma->vm_end,
vmf->pgoff, vmf->virtual_address);
return VM_FAULT_SIGBUS;
}
static struct vm_operations_struct privcmd_vm_ops = {
.fault = privcmd_fault
};
static int privcmd_mmap(struct file *file, struct vm_area_struct *vma)
{
/* Unsupported for auto-translate guests. */
if (xen_feature(XENFEAT_auto_translated_physmap))
return -ENOSYS;
/* DONTCOPY is essential for Xen as copy_page_range is broken. */
vma->vm_flags |= VM_RESERVED | VM_IO | VM_DONTCOPY;
vma->vm_ops = &privcmd_vm_ops;
vma->vm_private_data = NULL;
return 0;
}
static int privcmd_enforce_singleshot_mapping(struct vm_area_struct *vma)
{
return (xchg(&vma->vm_private_data, (void *)1) == NULL);
}
#endif
const struct file_operations privcmd_file_ops = {
.unlocked_ioctl = privcmd_ioctl,
.mmap = privcmd_mmap,
};

95
drivers/xen/xenfs/super.c
View File

@ -12,6 +12,8 @@
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/magic.h>
#include <linux/mm.h>
#include <linux/backing-dev.h>
#include <xen/xen.h>
@ -22,6 +24,62 @@
MODULE_DESCRIPTION("Xen filesystem");
MODULE_LICENSE("GPL");
static int xenfs_set_page_dirty(struct page *page)
{
return !TestSetPageDirty(page);
}
static const struct address_space_operations xenfs_aops = {
.set_page_dirty = xenfs_set_page_dirty,
};
static struct backing_dev_info xenfs_backing_dev_info = {
.ra_pages = 0, /* No readahead */
.capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
};
static struct inode *xenfs_make_inode(struct super_block *sb, int mode)
{
struct inode *ret = new_inode(sb);
if (ret) {
ret->i_mode = mode;
ret->i_mapping->a_ops = &xenfs_aops;
ret->i_mapping->backing_dev_info = &xenfs_backing_dev_info;
ret->i_uid = ret->i_gid = 0;
ret->i_blocks = 0;
ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
}
return ret;
}
static struct dentry *xenfs_create_file(struct super_block *sb,
struct dentry *parent,
const char *name,
const struct file_operations *fops,
void *data,
int mode)
{
struct dentry *dentry;
struct inode *inode;
dentry = d_alloc_name(parent, name);
if (!dentry)
return NULL;
inode = xenfs_make_inode(sb, S_IFREG | mode);
if (!inode) {
dput(dentry);
return NULL;
}
inode->i_fop = fops;
inode->i_private = data;
d_add(dentry, inode);
return dentry;
}
static ssize_t capabilities_read(struct file *file, char __user *buf,
size_t size, loff_t *off)
{
@ -44,10 +102,23 @@ static int xenfs_fill_super(struct super_block *sb, void *data, int silent)
[1] = {},
{ "xenbus", &xenbus_file_ops, S_IRUSR|S_IWUSR },
{ "capabilities", &capabilities_file_ops, S_IRUGO },
{ "privcmd", &privcmd_file_ops, S_IRUSR|S_IWUSR },
{""},
};
int rc;
return simple_fill_super(sb, XENFS_SUPER_MAGIC, xenfs_files);
rc = simple_fill_super(sb, XENFS_SUPER_MAGIC, xenfs_files);
if (rc < 0)
return rc;
if (xen_initial_domain()) {
xenfs_create_file(sb, sb->s_root, "xsd_kva",
&xsd_kva_file_ops, NULL, S_IRUSR|S_IWUSR);
xenfs_create_file(sb, sb->s_root, "xsd_port",
&xsd_port_file_ops, NULL, S_IRUSR|S_IWUSR);
}
return rc;
}
static int xenfs_get_sb(struct file_system_type *fs_type,
@ -66,11 +137,25 @@ static struct file_system_type xenfs_type = {
static int __init xenfs_init(void)
{
if (xen_domain())
return register_filesystem(&xenfs_type);
int err;
if (!xen_domain()) {
printk(KERN_INFO "xenfs: not registering filesystem on non-xen platform\n");
return 0;
}
printk(KERN_INFO "XENFS: not registering filesystem on non-xen platform\n");
return 0;
err = register_filesystem(&xenfs_type);
if (err) {
printk(KERN_ERR "xenfs: Unable to register filesystem!\n");
goto out;
}
err = bdi_init(&xenfs_backing_dev_info);
if (err)
unregister_filesystem(&xenfs_type);
out:
return err;
}
static void __exit xenfs_exit(void)

3
drivers/xen/xenfs/xenfs.h
View File

@ -2,5 +2,8 @@
#define _XENFS_XENBUS_H
extern const struct file_operations xenbus_file_ops;
extern const struct file_operations privcmd_file_ops;
extern const struct file_operations xsd_kva_file_ops;
extern const struct file_operations xsd_port_file_ops;
#endif /* _XENFS_XENBUS_H */

68
drivers/xen/xenfs/xenstored.c Normal file
View File

@ -0,0 +1,68 @@
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <xen/page.h>
#include "xenfs.h"
#include "../xenbus/xenbus_comms.h"
static ssize_t xsd_read(struct file *file, char __user *buf,
size_t size, loff_t *off)
{
const char *str = (const char *)file->private_data;
return simple_read_from_buffer(buf, size, off, str, strlen(str));
}
static int xsd_release(struct inode *inode, struct file *file)
{
kfree(file->private_data);
return 0;
}
static int xsd_kva_open(struct inode *inode, struct file *file)
{
file->private_data = (void *)kasprintf(GFP_KERNEL, "0x%p",
xen_store_interface);
if (!file->private_data)
return -ENOMEM;
return 0;
}
static int xsd_kva_mmap(struct file *file, struct vm_area_struct *vma)
{
size_t size = vma->vm_end - vma->vm_start;
if ((size > PAGE_SIZE) || (vma->vm_pgoff != 0))
return -EINVAL;
if (remap_pfn_range(vma, vma->vm_start,
virt_to_pfn(xen_store_interface),
size, vma->vm_page_prot))
return -EAGAIN;
return 0;
}
const struct file_operations xsd_kva_file_ops = {
.open = xsd_kva_open,
.mmap = xsd_kva_mmap,
.read = xsd_read,
.release = xsd_release,
};
static int xsd_port_open(struct inode *inode, struct file *file)
{
file->private_data = (void *)kasprintf(GFP_KERNEL, "%d",
xen_store_evtchn);
if (!file->private_data)
return -ENOMEM;
return 0;
}
const struct file_operations xsd_port_file_ops = {
.open = xsd_port_open,
.read = xsd_read,
.release = xsd_release,
};

1
include/xen/Kbuild
View File

@ -1 +1,2 @@
header-y += evtchn.h
header-y += privcmd.h

29
include/xen/interface/memory.h
View File

@ -186,6 +186,35 @@ struct xen_translate_gpfn_list {
};
DEFINE_GUEST_HANDLE_STRUCT(xen_translate_gpfn_list);
/*
* Returns the pseudo-physical memory map as it was when the domain
* was started (specified by XENMEM_set_memory_map).
* arg == addr of struct xen_memory_map.
*/
#define XENMEM_memory_map 9
struct xen_memory_map {
/*
* On call the number of entries which can be stored in buffer. On
* return the number of entries which have been stored in
* buffer.
*/
unsigned int nr_entries;
/*
* Entries in the buffer are in the same format as returned by the
* BIOS INT 0x15 EAX=0xE820 call.
*/
GUEST_HANDLE(void) buffer;
};
DEFINE_GUEST_HANDLE_STRUCT(xen_memory_map);
/*
* Returns the real physical memory map. Passes the same structure as
* XENMEM_memory_map.
* arg == addr of struct xen_memory_map.
*/
#define XENMEM_machine_memory_map 10
/*
* Prevent the balloon driver from changing the memory reservation

80
include/xen/privcmd.h Normal file
View File

@ -0,0 +1,80 @@
/******************************************************************************
* privcmd.h
*
* Interface to /proc/xen/privcmd.
*
* Copyright (c) 2003-2005, K A Fraser
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation; or, when distributed
* separately from the Linux kernel or incorporated into other
* software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef __LINUX_PUBLIC_PRIVCMD_H__
#define __LINUX_PUBLIC_PRIVCMD_H__
#include <linux/types.h>
typedef unsigned long xen_pfn_t;
#ifndef __user
#define __user
#endif
struct privcmd_hypercall {
__u64 op;
__u64 arg[5];
};
struct privcmd_mmap_entry {
__u64 va;
__u64 mfn;
__u64 npages;
};
struct privcmd_mmap {
int num;
domid_t dom; /* target domain */
struct privcmd_mmap_entry __user *entry;
};
struct privcmd_mmapbatch {
int num; /* number of pages to populate */
domid_t dom; /* target domain */
__u64 addr; /* virtual address */
xen_pfn_t __user *arr; /* array of mfns - top nibble set on err */
};
/*
* @cmd: IOCTL_PRIVCMD_HYPERCALL
* @arg: &privcmd_hypercall_t
* Return: Value returned from execution of the specified hypercall.
*/
#define IOCTL_PRIVCMD_HYPERCALL \
_IOC(_IOC_NONE, 'P', 0, sizeof(struct privcmd_hypercall))
#define IOCTL_PRIVCMD_MMAP \
_IOC(_IOC_NONE, 'P', 2, sizeof(struct privcmd_mmap))
#define IOCTL_PRIVCMD_MMAPBATCH \
_IOC(_IOC_NONE, 'P', 3, sizeof(struct privcmd_mmapbatch))
#endif /* __LINUX_PUBLIC_PRIVCMD_H__ */

5
include/xen/xen-ops.h
View File

@ -23,4 +23,9 @@ int xen_create_contiguous_region(unsigned long vstart, unsigned int order,
void xen_destroy_contiguous_region(unsigned long vstart, unsigned int order);
int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
unsigned long addr,
unsigned long mfn, int nr,
pgprot_t prot, unsigned domid);
#endif /* INCLUDE_XEN_OPS_H */