# HG changeset patch
# User Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
# Node ID fe6690ca97009772f1702c7bf82f55004eb06eae
# Parent 2644e0336cc57aa2acf6009a93c57f2c1e143ff0
[POWERPC][XEN] Handle foreign page mappings correctly
The following patch performs the following:
- add free_rma() to go with allocate_rma()
- allocate_rma() returns -EINVAL if an RMA is already allocated
- PFN_TYPE_REMOTE is now PFN_TYPE_FOREIGN
- better checking of page_info in pfn2mfn()
- Stop using RPN and LPN and use PFN and MFN respectively
- Increase/decrease foreign domain refcount when another domain
maps/unmaps it
Signed-off-by: Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
---
xen/arch/powerpc/domain.c | 3 -
xen/arch/powerpc/mm.c | 96 ++++++++++++++++++++++++++----------------
xen/arch/powerpc/papr/xlate.c | 60 ++++++++++++++++++++------
xen/arch/powerpc/usercopy.c | 4 -
xen/include/asm-powerpc/mm.h | 5 +-
5 files changed, 112 insertions(+), 56 deletions(-)
diff -r 2644e0336cc5 -r fe6690ca9700 xen/arch/powerpc/domain.c
--- a/xen/arch/powerpc/domain.c Tue Sep 12 10:53:46 2006 -0400
+++ b/xen/arch/powerpc/domain.c Tue Sep 12 11:01:04 2006 -0400
@@ -244,8 +244,7 @@ void sync_vcpu_execstate(struct vcpu *v)
void domain_relinquish_resources(struct domain *d)
{
- if (d->arch.rma_page)
- free_domheap_pages(d->arch.rma_page, d->arch.rma_order);
+ free_rma(d);
free_extents(d);
}
diff -r 2644e0336cc5 -r fe6690ca9700 xen/arch/powerpc/mm.c
--- a/xen/arch/powerpc/mm.c Tue Sep 12 10:53:46 2006 -0400
+++ b/xen/arch/powerpc/mm.c Tue Sep 12 11:01:04 2006 -0400
@@ -299,7 +299,7 @@ int allocate_rma(struct domain *d, unsig
ulong rma_sz;
if (d->arch.rma_page)
- free_domheap_pages(d->arch.rma_page, d->arch.rma_order);
+ return -EINVAL;
d->arch.rma_page = alloc_domheap_pages(d, order, 0);
if (d->arch.rma_page == NULL) {
@@ -329,50 +329,74 @@ int allocate_rma(struct domain *d, unsig
return 0;
}
+void free_rma(struct domain *d)
+{
+ if (d->arch.rma_page) {
+ free_domheap_pages(d->arch.rma_page, d->arch.rma_order);
+ }
+}
+
ulong pfn2mfn(struct domain *d, ulong pfn, int *type)
{
ulong rma_base_mfn = page_to_mfn(d->arch.rma_page);
ulong rma_size_mfn = 1UL << d->arch.rma_order;
struct page_extents *pe;
-
- if (type)
- *type = PFN_TYPE_NONE;
+ ulong mfn = INVALID_MFN;
+ int t = PFN_TYPE_NONE;
/* quick tests first */
- if (pfn < rma_size_mfn) {
- if (type)
- *type = PFN_TYPE_RMA;
- return pfn + rma_base_mfn;
- }
-
if (test_bit(_DOMF_privileged, &d->domain_flags) &&
cpu_io_mfn(pfn)) {
- if (type)
- *type = PFN_TYPE_IO;
- return pfn;
- }
-
- list_for_each_entry (pe, &d->arch.extent_list, pe_list) {
- uint end_pfn = pe->pfn + (1 << pe->order);
-
- if (pfn >= pe->pfn && pfn < end_pfn) {
- if (type)
- *type = PFN_TYPE_LOGICAL;
- return page_to_mfn(pe->pg) + (pfn - pe->pfn);
- }
- }
-
- /* This hack allows dom0 to map all memory, necessary to
- * initialize domU state. */
- if (test_bit(_DOMF_privileged, &d->domain_flags) &&
- pfn < max_page) {
- if (type)
- *type = PFN_TYPE_REMOTE;
- return pfn;
- }
-
- BUG();
- return INVALID_MFN;
+ t = PFN_TYPE_IO;
+ mfn = pfn;
+ } else {
+ if (pfn < rma_size_mfn) {
+ t = PFN_TYPE_RMA;
+ mfn = pfn + rma_base_mfn;
+ } else {
+ list_for_each_entry (pe, &d->arch.extent_list, pe_list) {
+ uint end_pfn = pe->pfn + (1 << pe->order);
+
+ if (pfn >= pe->pfn && pfn < end_pfn) {
+ t = PFN_TYPE_LOGICAL;
+ mfn = page_to_mfn(pe->pg) + (pfn - pe->pfn);
+ break;
+ }
+ }
+ }
+ BUG_ON(t != PFN_TYPE_NONE && page_get_owner(mfn_to_page(mfn)) != d);
+ }
+
+ if (t == PFN_TYPE_NONE) {
+ /* This hack allows dom0 to map all memory, necessary to
+ * initialize domU state. */
+ if (test_bit(_DOMF_privileged, &d->domain_flags) &&
+ mfn_valid(pfn)) {
+ struct page_info *pg;
+
+ /* page better be allocated to some domain but not the caller */
+ pg = mfn_to_page(pfn);
+ if (!(pg->count_info & PGC_allocated))
+ panic("Foreign page: 0x%lx is not owned by any domain\n",
+ mfn);
+ if (page_get_owner(pg) == d)
+ panic("Foreign page: 0x%lx is owned by this domain\n",
+ mfn);
+
+ t = PFN_TYPE_FOREIGN;
+ mfn = pfn;
+ }
+ }
+
+ if (mfn == INVALID_MFN) {
+ printk("%s: Dom[%d] pfn 0x%lx is not a valid page\n",
+ __func__, d->domain_id, pfn);
+ }
+
+ if (type)
+ *type = t;
+
+ return mfn;
}
void guest_physmap_add_page(
diff -r 2644e0336cc5 -r fe6690ca9700 xen/arch/powerpc/papr/xlate.c
--- a/xen/arch/powerpc/papr/xlate.c Tue Sep 12 10:53:46 2006 -0400
+++ b/xen/arch/powerpc/papr/xlate.c Tue Sep 12 11:01:04 2006 -0400
@@ -118,8 +118,8 @@ static void h_enter(struct cpu_user_regs
int pgshift = PAGE_SHIFT;
ulong idx;
int limit = 0; /* how many PTEs to examine in the PTEG */
- ulong lpn;
- ulong rpn;
+ ulong pfn;
+ ulong mfn;
struct vcpu *v = get_current();
struct domain *d = v->domain;
int mtype;
@@ -160,11 +160,11 @@ static void h_enter(struct cpu_user_regs
/* get the correct logical RPN in terms of 4K pages need to mask
* off lp bits and unused arpn bits if this is a large page */
- lpn = ~0ULL << (pgshift - PAGE_SHIFT);
- lpn = pte.bits.rpn & lpn;
-
- rpn = pfn2mfn(d, lpn, &mtype);
- if (rpn == INVALID_MFN) {
+ pfn = ~0ULL << (pgshift - PAGE_SHIFT);
+ pfn = pte.bits.rpn & pfn;
+
+ mfn = pfn2mfn(d, pfn, &mtype);
+ if (mfn == INVALID_MFN) {
regs->gprs[3] = H_Parameter;
return;
}
@@ -173,8 +173,8 @@ static void h_enter(struct cpu_user_regs
/* only a privilaged dom can access outside IO space */
if ( !test_bit(_DOMF_privileged, &d->domain_flags) ) {
regs->gprs[3] = H_Privilege;
- printk("%s: unprivileged access to logical page: 0x%lx\n",
- __func__, lpn);
+ printk("%s: unprivileged access to physical page: 0x%lx\n",
+ __func__, pfn);
return;
}
@@ -192,7 +192,7 @@ static void h_enter(struct cpu_user_regs
}
}
/* fixup the RPN field of our local PTE copy */
- pte.bits.rpn = rpn | lp_bits;
+ pte.bits.rpn = mfn | lp_bits;
/* clear reserved bits in high word */
pte.bits.lock = 0x0;
@@ -211,12 +211,12 @@ static void h_enter(struct cpu_user_regs
/* data manipulations should be done prior to the pte insertion. */
if ( flags & H_ZERO_PAGE ) {
- memset((void *)(rpn << PAGE_SHIFT), 0, 1UL << pgshift);
+ memset((void *)(mfn << PAGE_SHIFT), 0, 1UL << pgshift);
}
if ( flags & H_ICACHE_INVALIDATE ) {
ulong k;
- ulong addr = rpn << PAGE_SHIFT;
+ ulong addr = mfn << PAGE_SHIFT;
for (k = 0; k < (1UL << pgshift); k += L1_CACHE_BYTES) {
dcbst(addr + k);
@@ -229,7 +229,7 @@ static void h_enter(struct cpu_user_regs
if ( flags & H_ICACHE_SYNCHRONIZE ) {
ulong k;
- ulong addr = rpn << PAGE_SHIFT;
+ ulong addr = mfn << PAGE_SHIFT;
for (k = 0; k < (1UL << pgshift); k += L1_CACHE_BYTES) {
icbi(addr + k);
sync();
@@ -251,6 +251,26 @@ static void h_enter(struct cpu_user_regs
regs->gprs[3] = H_Success;
regs->gprs[4] = idx;
+
+
+ switch (mtype) {
+ case PFN_TYPE_IO:
+ break;
+ case PFN_TYPE_FOREIGN:
+ {
+ struct page_info *pg = mfn_to_page(mfn);
+ struct domain *f = page_get_owner(pg);
+
+ BUG_ON(f == d);
+ get_domain(f);
+ }
+ break;
+ case PFN_TYPE_RMA:
+ case PFN_TYPE_LOGICAL:
+ break;
+ default:
+ BUG();
+ }
return;
}
@@ -480,9 +500,21 @@ static void h_remove(struct cpu_user_reg
/* XXX - I'm very skeptical of doing ANYTHING if not bits.v */
/* XXX - I think the spec should be questioned in this case (MFM) */
- if (pte->bits.v == 0) {
+ if (lpte.bits.v == 0) {
printk("%s: removing invalid entry\n", __func__);
}
+
+ if (lpte.bits.v) {
+ ulong mfn = lpte.bits.rpn;
+ if (!cpu_io_mfn(mfn)) {
+ struct page_info *pg = mfn_to_page(mfn);
+ struct domain *f = page_get_owner(pg);
+
+ if (f != d)
+ put_domain(f);
+ }
+ }
+
asm volatile("eieio; std %1, 0(%0); ptesync"
:
: "b" (pte), "r" (0)
diff -r 2644e0336cc5 -r fe6690ca9700 xen/arch/powerpc/usercopy.c
--- a/xen/arch/powerpc/usercopy.c Tue Sep 12 10:53:46 2006 -0400
+++ b/xen/arch/powerpc/usercopy.c Tue Sep 12 11:01:04 2006 -0400
@@ -57,10 +57,10 @@ static unsigned long paddr_to_maddr(unsi
case PFN_TYPE_LOGICAL:
break;
- case PFN_TYPE_REMOTE:
+ case PFN_TYPE_FOREIGN:
/* I don't think this should ever happen, but I suppose it
* could be possible */
- printk("%s: Dom:%d paddr: 0x%lx type: REMOTE\n",
+ printk("%s: Dom:%d paddr: 0x%lx type: FOREIGN\n",
__func__, d->domain_id, paddr);
WARN();
break;
diff -r 2644e0336cc5 -r fe6690ca9700 xen/include/asm-powerpc/mm.h
--- a/xen/include/asm-powerpc/mm.h Tue Sep 12 10:53:46 2006 -0400
+++ b/xen/include/asm-powerpc/mm.h Tue Sep 12 11:01:04 2006 -0400
@@ -154,7 +154,7 @@ static inline void put_page(struct page_
while ( unlikely((y = cmpxchg(&page->count_info, x, nx)) != x) );
if ( unlikely((nx & PGC_count_mask) == 0) ) {
- panic("about to free page\n");
+ panic("about to free page: 0x%lx\n", page_to_mfn(page));
free_domheap_page(page);
}
}
@@ -239,7 +239,7 @@ extern int update_grant_va_mapping(unsig
#define PFN_TYPE_RMA 1
#define PFN_TYPE_LOGICAL 2
#define PFN_TYPE_IO 3
-#define PFN_TYPE_REMOTE 4
+#define PFN_TYPE_FOREIGN 4
extern ulong pfn2mfn(struct domain *d, ulong pfn, int *type);
@@ -259,6 +259,7 @@ static inline unsigned long gmfn_to_mfn(
#define mfn_to_gmfn(_d, mfn) (mfn)
extern int allocate_rma(struct domain *d, unsigned int order_pages);
+extern void free_rma(struct domain *d);
extern uint allocate_extents(struct domain *d, uint nrpages, uint rma_nrpages);
extern void free_extents(struct domain *d);
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