xen/p2m/m2p/gnttab: Support GNTMAP_host_map in the M2P override.
We only supported the M2P (and P2M) override only for the GNTMAP_contains_pte type mappings. Meaning that we grants operations would "contain the machine address of the PTE to update" If the flag is unset, then the grant operation is "contains a host virtual address". The latter case means that the Hypervisor takes care of updating our page table (specifically the PTE entry) with the guest's MFN. As such we should not try to do anything with the PTE. Previous to this patch we would try to clear the PTE which resulted in Xen hypervisor being upset with us: (XEN) mm.c:1066:d0 Attempt to implicitly unmap a granted PTE c0100000ccc59067 (XEN) domain_crash called from mm.c:1067 (XEN) Domain 0 (vcpu#0) crashed on cpu#3: (XEN) ----[ Xen-4.0-110228 x86_64 debug=y Not tainted ]---- and crashing us. This patch allows us to inhibit the PTE clearing in the PV guest if the GNTMAP_contains_pte is not set. On the m2p_remove_override path we provide the same parameter. Sadly in the grant-table driver we do not have a mechanism to tell m2p_remove_override whether to clear the PTE or not. Since the grant-table driver is used by user-space, we can safely assume that it operates only on PTE's. Hence the implementation for it to work on !GNTMAP_contains_pte returns -EOPNOTSUPP. In the future we can implement the support for this. It will require some extra accounting structure to keep track of the page[i], and the flag. [v1: Added documentation details, made it return -EOPNOTSUPP instead of trying to do a half-way implementation] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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@ -47,8 +47,9 @@ extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
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extern unsigned long set_phys_range_identity(unsigned long pfn_s,
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unsigned long pfn_e);
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extern int m2p_add_override(unsigned long mfn, struct page *page);
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extern int m2p_remove_override(struct page *page);
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extern int m2p_add_override(unsigned long mfn, struct page *page,
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bool clear_pte);
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extern int m2p_remove_override(struct page *page, bool clear_pte);
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extern struct page *m2p_find_override(unsigned long mfn);
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extern unsigned long m2p_find_override_pfn(unsigned long mfn, unsigned long pfn);
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@ -650,7 +650,7 @@ static unsigned long mfn_hash(unsigned long mfn)
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}
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/* Add an MFN override for a particular page */
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int m2p_add_override(unsigned long mfn, struct page *page)
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int m2p_add_override(unsigned long mfn, struct page *page, bool clear_pte)
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{
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unsigned long flags;
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unsigned long pfn;
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@ -662,7 +662,6 @@ int m2p_add_override(unsigned long mfn, struct page *page)
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if (!PageHighMem(page)) {
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address = (unsigned long)__va(pfn << PAGE_SHIFT);
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ptep = lookup_address(address, &level);
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if (WARN(ptep == NULL || level != PG_LEVEL_4K,
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"m2p_add_override: pfn %lx not mapped", pfn))
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return -EINVAL;
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@ -674,10 +673,9 @@ int m2p_add_override(unsigned long mfn, struct page *page)
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if (unlikely(!set_phys_to_machine(pfn, FOREIGN_FRAME(mfn))))
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return -ENOMEM;
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if (!PageHighMem(page))
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if (clear_pte && !PageHighMem(page))
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/* Just zap old mapping for now */
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pte_clear(&init_mm, address, ptep);
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spin_lock_irqsave(&m2p_override_lock, flags);
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list_add(&page->lru, &m2p_overrides[mfn_hash(mfn)]);
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spin_unlock_irqrestore(&m2p_override_lock, flags);
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@ -685,7 +683,7 @@ int m2p_add_override(unsigned long mfn, struct page *page)
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return 0;
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}
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int m2p_remove_override(struct page *page)
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int m2p_remove_override(struct page *page, bool clear_pte)
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{
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unsigned long flags;
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unsigned long mfn;
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@ -713,7 +711,7 @@ int m2p_remove_override(struct page *page)
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spin_unlock_irqrestore(&m2p_override_lock, flags);
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set_phys_to_machine(pfn, page->index);
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if (!PageHighMem(page))
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if (clear_pte && !PageHighMem(page))
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set_pte_at(&init_mm, address, ptep,
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pfn_pte(pfn, PAGE_KERNEL));
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/* No tlb flush necessary because the caller already
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@ -466,13 +466,30 @@ int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
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if (map_ops[i].status)
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continue;
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/* m2p override only supported for GNTMAP_contains_pte mappings */
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if (!(map_ops[i].flags & GNTMAP_contains_pte))
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continue;
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pte = (pte_t *) (mfn_to_virt(PFN_DOWN(map_ops[i].host_addr)) +
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if (map_ops[i].flags & GNTMAP_contains_pte) {
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pte = (pte_t *) (mfn_to_virt(PFN_DOWN(map_ops[i].host_addr)) +
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(map_ops[i].host_addr & ~PAGE_MASK));
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mfn = pte_mfn(*pte);
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ret = m2p_add_override(mfn, pages[i]);
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mfn = pte_mfn(*pte);
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} else {
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/* If you really wanted to do this:
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* mfn = PFN_DOWN(map_ops[i].dev_bus_addr);
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*
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* The reason we do not implement it is b/c on the
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* unmap path (gnttab_unmap_refs) we have no means of
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* checking whether the page is !GNTMAP_contains_pte.
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*
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* That is without some extra data-structure to carry
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* the struct page, bool clear_pte, and list_head next
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* tuples and deal with allocation/delallocation, etc.
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*
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* The users of this API set the GNTMAP_contains_pte
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* flag so lets just return not supported until it
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* becomes neccessary to implement.
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*/
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return -EOPNOTSUPP;
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}
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ret = m2p_add_override(mfn, pages[i],
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map_ops[i].flags & GNTMAP_contains_pte);
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if (ret)
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return ret;
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}
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@ -494,7 +511,7 @@ int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops,
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return ret;
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for (i = 0; i < count; i++) {
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ret = m2p_remove_override(pages[i]);
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ret = m2p_remove_override(pages[i], true /* clear the PTE */);
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if (ret)
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return ret;
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}
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