xen/grant-table: remove support for V2 tables
Since 11c7ff17c9 (xen/grant-table: Force
to use v1 of grants.) the code for V2 grant tables is not used.
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
David Vrabel
Konrad Rzeszutek Wilk
parent
162e371712
commit
438b33c714
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@ -45,14 +45,7 @@ void arch_gnttab_unmap(void *shared, unsigned long nr_gframes)
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return;
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}
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int arch_gnttab_map_status(uint64_t *frames, unsigned long nr_gframes,
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unsigned long max_nr_gframes,
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grant_status_t **__shared)
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{
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return -ENOSYS;
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}
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int arch_gnttab_init(unsigned long nr_shared, unsigned long nr_status)
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int arch_gnttab_init(unsigned long nr_shared)
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{
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return 0;
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}
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@ -49,7 +49,7 @@
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static struct gnttab_vm_area {
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struct vm_struct *area;
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pte_t **ptes;
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} gnttab_shared_vm_area, gnttab_status_vm_area;
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} gnttab_shared_vm_area;
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int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
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unsigned long max_nr_gframes,
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@ -73,43 +73,16 @@ int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
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return 0;
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}
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int arch_gnttab_map_status(uint64_t *frames, unsigned long nr_gframes,
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unsigned long max_nr_gframes,
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grant_status_t **__shared)
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{
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grant_status_t *shared = *__shared;
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unsigned long addr;
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unsigned long i;
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if (shared == NULL)
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*__shared = shared = gnttab_status_vm_area.area->addr;
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addr = (unsigned long)shared;
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for (i = 0; i < nr_gframes; i++) {
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set_pte_at(&init_mm, addr, gnttab_status_vm_area.ptes[i],
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mfn_pte(frames[i], PAGE_KERNEL));
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addr += PAGE_SIZE;
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}
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return 0;
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}
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void arch_gnttab_unmap(void *shared, unsigned long nr_gframes)
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{
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pte_t **ptes;
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unsigned long addr;
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unsigned long i;
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if (shared == gnttab_status_vm_area.area->addr)
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ptes = gnttab_status_vm_area.ptes;
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else
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ptes = gnttab_shared_vm_area.ptes;
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addr = (unsigned long)shared;
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for (i = 0; i < nr_gframes; i++) {
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set_pte_at(&init_mm, addr, ptes[i], __pte(0));
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set_pte_at(&init_mm, addr, gnttab_shared_vm_area.ptes[i],
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__pte(0));
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addr += PAGE_SIZE;
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}
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}
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@ -129,35 +102,12 @@ static int arch_gnttab_valloc(struct gnttab_vm_area *area, unsigned nr_frames)
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return 0;
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}
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static void arch_gnttab_vfree(struct gnttab_vm_area *area)
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int arch_gnttab_init(unsigned long nr_shared)
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{
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free_vm_area(area->area);
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kfree(area->ptes);
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}
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int arch_gnttab_init(unsigned long nr_shared, unsigned long nr_status)
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{
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int ret;
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if (!xen_pv_domain())
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return 0;
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ret = arch_gnttab_valloc(&gnttab_shared_vm_area, nr_shared);
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if (ret < 0)
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return ret;
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/*
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* Always allocate the space for the status frames in case
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* we're migrated to a host with V2 support.
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*/
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ret = arch_gnttab_valloc(&gnttab_status_vm_area, nr_status);
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if (ret < 0)
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goto err;
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return 0;
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err:
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arch_gnttab_vfree(&gnttab_shared_vm_area);
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return -ENOMEM;
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return arch_gnttab_valloc(&gnttab_shared_vm_area, nr_shared);
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}
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#ifdef CONFIG_XEN_PVH
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@ -69,7 +69,6 @@ struct grant_frames xen_auto_xlat_grant_frames;
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static union {
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struct grant_entry_v1 *v1;
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union grant_entry_v2 *v2;
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void *addr;
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} gnttab_shared;
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@ -120,36 +119,10 @@ struct gnttab_ops {
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* by bit operations.
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*/
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int (*query_foreign_access)(grant_ref_t ref);
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/*
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* Grant a domain to access a range of bytes within the page referred by
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* an available grant entry. Ref parameter is reference of a grant entry
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* which will be sub-page accessed, domid is id of grantee domain, frame
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* is frame address of subpage grant, flags is grant type and flag
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* information, page_off is offset of the range of bytes, and length is
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* length of bytes to be accessed.
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*/
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void (*update_subpage_entry)(grant_ref_t ref, domid_t domid,
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unsigned long frame, int flags,
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unsigned page_off, unsigned length);
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/*
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* Redirect an available grant entry on domain A to another grant
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* reference of domain B, then allow domain C to use grant reference
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* of domain B transitively. Ref parameter is an available grant entry
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* reference on domain A, domid is id of domain C which accesses grant
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* entry transitively, flags is grant type and flag information,
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* trans_domid is id of domain B whose grant entry is finally accessed
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* transitively, trans_gref is grant entry transitive reference of
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* domain B.
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*/
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void (*update_trans_entry)(grant_ref_t ref, domid_t domid, int flags,
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domid_t trans_domid, grant_ref_t trans_gref);
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};
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static struct gnttab_ops *gnttab_interface;
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/*This reflects status of grant entries, so act as a global value*/
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static grant_status_t *grstatus;
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static int grant_table_version;
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static int grefs_per_grant_frame;
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@ -231,7 +204,7 @@ static void put_free_entry(grant_ref_t ref)
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}
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/*
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* Following applies to gnttab_update_entry_v1 and gnttab_update_entry_v2.
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* Following applies to gnttab_update_entry_v1.
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* Introducing a valid entry into the grant table:
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* 1. Write ent->domid.
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* 2. Write ent->frame:
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@ -250,15 +223,6 @@ static void gnttab_update_entry_v1(grant_ref_t ref, domid_t domid,
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gnttab_shared.v1[ref].flags = flags;
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}
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static void gnttab_update_entry_v2(grant_ref_t ref, domid_t domid,
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unsigned long frame, unsigned flags)
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{
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gnttab_shared.v2[ref].hdr.domid = domid;
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gnttab_shared.v2[ref].full_page.frame = frame;
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wmb();
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gnttab_shared.v2[ref].hdr.flags = GTF_permit_access | flags;
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}
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/*
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* Public grant-issuing interface functions
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*/
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@ -285,132 +249,11 @@ int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
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}
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EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access);
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static void gnttab_update_subpage_entry_v2(grant_ref_t ref, domid_t domid,
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unsigned long frame, int flags,
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unsigned page_off, unsigned length)
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{
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gnttab_shared.v2[ref].sub_page.frame = frame;
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gnttab_shared.v2[ref].sub_page.page_off = page_off;
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gnttab_shared.v2[ref].sub_page.length = length;
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gnttab_shared.v2[ref].hdr.domid = domid;
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wmb();
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gnttab_shared.v2[ref].hdr.flags =
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GTF_permit_access | GTF_sub_page | flags;
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}
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int gnttab_grant_foreign_access_subpage_ref(grant_ref_t ref, domid_t domid,
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unsigned long frame, int flags,
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unsigned page_off,
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unsigned length)
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{
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if (flags & (GTF_accept_transfer | GTF_reading |
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GTF_writing | GTF_transitive))
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return -EPERM;
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if (gnttab_interface->update_subpage_entry == NULL)
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return -ENOSYS;
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gnttab_interface->update_subpage_entry(ref, domid, frame, flags,
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page_off, length);
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return 0;
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}
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EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_subpage_ref);
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int gnttab_grant_foreign_access_subpage(domid_t domid, unsigned long frame,
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int flags, unsigned page_off,
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unsigned length)
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{
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int ref, rc;
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ref = get_free_entries(1);
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if (unlikely(ref < 0))
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return -ENOSPC;
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rc = gnttab_grant_foreign_access_subpage_ref(ref, domid, frame, flags,
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page_off, length);
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if (rc < 0) {
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put_free_entry(ref);
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return rc;
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}
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return ref;
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}
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EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_subpage);
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bool gnttab_subpage_grants_available(void)
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{
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return gnttab_interface->update_subpage_entry != NULL;
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}
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EXPORT_SYMBOL_GPL(gnttab_subpage_grants_available);
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static void gnttab_update_trans_entry_v2(grant_ref_t ref, domid_t domid,
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int flags, domid_t trans_domid,
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grant_ref_t trans_gref)
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{
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gnttab_shared.v2[ref].transitive.trans_domid = trans_domid;
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gnttab_shared.v2[ref].transitive.gref = trans_gref;
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gnttab_shared.v2[ref].hdr.domid = domid;
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wmb();
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gnttab_shared.v2[ref].hdr.flags =
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GTF_permit_access | GTF_transitive | flags;
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}
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int gnttab_grant_foreign_access_trans_ref(grant_ref_t ref, domid_t domid,
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int flags, domid_t trans_domid,
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grant_ref_t trans_gref)
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{
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if (flags & (GTF_accept_transfer | GTF_reading |
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GTF_writing | GTF_sub_page))
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return -EPERM;
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if (gnttab_interface->update_trans_entry == NULL)
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return -ENOSYS;
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gnttab_interface->update_trans_entry(ref, domid, flags, trans_domid,
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trans_gref);
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return 0;
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}
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EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_trans_ref);
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int gnttab_grant_foreign_access_trans(domid_t domid, int flags,
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domid_t trans_domid,
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grant_ref_t trans_gref)
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{
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int ref, rc;
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ref = get_free_entries(1);
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if (unlikely(ref < 0))
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return -ENOSPC;
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rc = gnttab_grant_foreign_access_trans_ref(ref, domid, flags,
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trans_domid, trans_gref);
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if (rc < 0) {
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put_free_entry(ref);
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return rc;
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}
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return ref;
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}
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EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_trans);
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bool gnttab_trans_grants_available(void)
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{
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return gnttab_interface->update_trans_entry != NULL;
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}
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EXPORT_SYMBOL_GPL(gnttab_trans_grants_available);
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static int gnttab_query_foreign_access_v1(grant_ref_t ref)
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{
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return gnttab_shared.v1[ref].flags & (GTF_reading|GTF_writing);
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}
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static int gnttab_query_foreign_access_v2(grant_ref_t ref)
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{
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return grstatus[ref] & (GTF_reading|GTF_writing);
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}
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int gnttab_query_foreign_access(grant_ref_t ref)
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{
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return gnttab_interface->query_foreign_access(ref);
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@ -433,29 +276,6 @@ static int gnttab_end_foreign_access_ref_v1(grant_ref_t ref, int readonly)
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return 1;
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}
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static int gnttab_end_foreign_access_ref_v2(grant_ref_t ref, int readonly)
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{
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gnttab_shared.v2[ref].hdr.flags = 0;
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mb();
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if (grstatus[ref] & (GTF_reading|GTF_writing)) {
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return 0;
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} else {
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/* The read of grstatus needs to have acquire
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semantics. On x86, reads already have
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that, and we just need to protect against
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compiler reorderings. On other
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architectures we may need a full
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barrier. */
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#ifdef CONFIG_X86
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barrier();
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#else
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mb();
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#endif
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}
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return 1;
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}
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static inline int _gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly)
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{
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return gnttab_interface->end_foreign_access_ref(ref, readonly);
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@ -616,37 +436,6 @@ static unsigned long gnttab_end_foreign_transfer_ref_v1(grant_ref_t ref)
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return frame;
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}
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static unsigned long gnttab_end_foreign_transfer_ref_v2(grant_ref_t ref)
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{
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unsigned long frame;
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u16 flags;
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u16 *pflags;
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pflags = &gnttab_shared.v2[ref].hdr.flags;
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/*
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* If a transfer is not even yet started, try to reclaim the grant
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* reference and return failure (== 0).
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*/
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while (!((flags = *pflags) & GTF_transfer_committed)) {
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if (sync_cmpxchg(pflags, flags, 0) == flags)
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return 0;
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cpu_relax();
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}
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/* If a transfer is in progress then wait until it is completed. */
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while (!(flags & GTF_transfer_completed)) {
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flags = *pflags;
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cpu_relax();
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}
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rmb(); /* Read the frame number /after/ reading completion status. */
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frame = gnttab_shared.v2[ref].full_page.frame;
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BUG_ON(frame == 0);
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return frame;
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}
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unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref)
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{
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return gnttab_interface->end_foreign_transfer_ref(ref);
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@ -962,12 +751,6 @@ int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops,
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}
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EXPORT_SYMBOL_GPL(gnttab_unmap_refs);
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static unsigned nr_status_frames(unsigned nr_grant_frames)
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{
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BUG_ON(grefs_per_grant_frame == 0);
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return (nr_grant_frames * grefs_per_grant_frame + SPP - 1) / SPP;
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}
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static int gnttab_map_frames_v1(xen_pfn_t *frames, unsigned int nr_gframes)
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{
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int rc;
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@ -985,55 +768,6 @@ static void gnttab_unmap_frames_v1(void)
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arch_gnttab_unmap(gnttab_shared.addr, nr_grant_frames);
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}
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static int gnttab_map_frames_v2(xen_pfn_t *frames, unsigned int nr_gframes)
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{
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uint64_t *sframes;
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unsigned int nr_sframes;
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struct gnttab_get_status_frames getframes;
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int rc;
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nr_sframes = nr_status_frames(nr_gframes);
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/* No need for kzalloc as it is initialized in following hypercall
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* GNTTABOP_get_status_frames.
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*/
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sframes = kmalloc(nr_sframes * sizeof(uint64_t), GFP_ATOMIC);
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if (!sframes)
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return -ENOMEM;
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getframes.dom = DOMID_SELF;
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getframes.nr_frames = nr_sframes;
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set_xen_guest_handle(getframes.frame_list, sframes);
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rc = HYPERVISOR_grant_table_op(GNTTABOP_get_status_frames,
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&getframes, 1);
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if (rc == -ENOSYS) {
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kfree(sframes);
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return -ENOSYS;
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}
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BUG_ON(rc || getframes.status);
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rc = arch_gnttab_map_status(sframes, nr_sframes,
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nr_status_frames(gnttab_max_grant_frames()),
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&grstatus);
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BUG_ON(rc);
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kfree(sframes);
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rc = arch_gnttab_map_shared(frames, nr_gframes,
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gnttab_max_grant_frames(),
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&gnttab_shared.addr);
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BUG_ON(rc);
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return 0;
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}
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static void gnttab_unmap_frames_v2(void)
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{
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arch_gnttab_unmap(gnttab_shared.addr, nr_grant_frames);
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arch_gnttab_unmap(grstatus, nr_status_frames(nr_grant_frames));
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}
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static int gnttab_map(unsigned int start_idx, unsigned int end_idx)
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{
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struct gnttab_setup_table setup;
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@ -1101,43 +835,13 @@ static struct gnttab_ops gnttab_v1_ops = {
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.query_foreign_access = gnttab_query_foreign_access_v1,
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};
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|
||||
static struct gnttab_ops gnttab_v2_ops = {
|
||||
.map_frames = gnttab_map_frames_v2,
|
||||
.unmap_frames = gnttab_unmap_frames_v2,
|
||||
.update_entry = gnttab_update_entry_v2,
|
||||
.end_foreign_access_ref = gnttab_end_foreign_access_ref_v2,
|
||||
.end_foreign_transfer_ref = gnttab_end_foreign_transfer_ref_v2,
|
||||
.query_foreign_access = gnttab_query_foreign_access_v2,
|
||||
.update_subpage_entry = gnttab_update_subpage_entry_v2,
|
||||
.update_trans_entry = gnttab_update_trans_entry_v2,
|
||||
};
|
||||
|
||||
static void gnttab_request_version(void)
|
||||
{
|
||||
int rc;
|
||||
struct gnttab_set_version gsv;
|
||||
/* Only version 1 is used, which will always be available. */
|
||||
grant_table_version = 1;
|
||||
grefs_per_grant_frame = PAGE_SIZE / sizeof(struct grant_entry_v1);
|
||||
gnttab_interface = &gnttab_v1_ops;
|
||||
|
||||
gsv.version = 1;
|
||||
|
||||
rc = HYPERVISOR_grant_table_op(GNTTABOP_set_version, &gsv, 1);
|
||||
if (rc == 0 && gsv.version == 2) {
|
||||
grant_table_version = 2;
|
||||
grefs_per_grant_frame = PAGE_SIZE / sizeof(union grant_entry_v2);
|
||||
gnttab_interface = &gnttab_v2_ops;
|
||||
} else if (grant_table_version == 2) {
|
||||
/*
|
||||
* If we've already used version 2 features,
|
||||
* but then suddenly discover that they're not
|
||||
* available (e.g. migrating to an older
|
||||
* version of Xen), almost unbounded badness
|
||||
* can happen.
|
||||
*/
|
||||
panic("we need grant tables version 2, but only version 1 is available");
|
||||
} else {
|
||||
grant_table_version = 1;
|
||||
grefs_per_grant_frame = PAGE_SIZE / sizeof(struct grant_entry_v1);
|
||||
gnttab_interface = &gnttab_v1_ops;
|
||||
}
|
||||
pr_info("Grant tables using version %d layout\n", grant_table_version);
|
||||
}
|
||||
|
||||
|
|
@ -1225,8 +929,7 @@ int gnttab_init(void)
|
|||
}
|
||||
}
|
||||
|
||||
ret = arch_gnttab_init(max_nr_grant_frames,
|
||||
nr_status_frames(max_nr_grant_frames));
|
||||
ret = arch_gnttab_init(max_nr_grant_frames);
|
||||
if (ret < 0)
|
||||
goto ini_nomem;
|
||||
|
||||
|
|
|
|||
|
|
@ -64,24 +64,6 @@ int gnttab_resume(void);
|
|||
|
||||
int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
|
||||
int readonly);
|
||||
int gnttab_grant_foreign_access_subpage(domid_t domid, unsigned long frame,
|
||||
int flags, unsigned page_off,
|
||||
unsigned length);
|
||||
int gnttab_grant_foreign_access_trans(domid_t domid, int flags,
|
||||
domid_t trans_domid,
|
||||
grant_ref_t trans_gref);
|
||||
|
||||
/*
|
||||
* Are sub-page grants available on this version of Xen? Returns true if they
|
||||
* are, and false if they're not.
|
||||
*/
|
||||
bool gnttab_subpage_grants_available(void);
|
||||
|
||||
/*
|
||||
* Are transitive grants available on this version of Xen? Returns true if they
|
||||
* are, and false if they're not.
|
||||
*/
|
||||
bool gnttab_trans_grants_available(void);
|
||||
|
||||
/*
|
||||
* End access through the given grant reference, iff the grant entry is no
|
||||
|
|
@ -128,13 +110,6 @@ void gnttab_cancel_free_callback(struct gnttab_free_callback *callback);
|
|||
|
||||
void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
|
||||
unsigned long frame, int readonly);
|
||||
int gnttab_grant_foreign_access_subpage_ref(grant_ref_t ref, domid_t domid,
|
||||
unsigned long frame, int flags,
|
||||
unsigned page_off,
|
||||
unsigned length);
|
||||
int gnttab_grant_foreign_access_trans_ref(grant_ref_t ref, domid_t domid,
|
||||
int flags, domid_t trans_domid,
|
||||
grant_ref_t trans_gref);
|
||||
|
||||
void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
|
||||
unsigned long pfn);
|
||||
|
|
@ -170,13 +145,10 @@ gnttab_set_unmap_op(struct gnttab_unmap_grant_ref *unmap, phys_addr_t addr,
|
|||
unmap->dev_bus_addr = 0;
|
||||
}
|
||||
|
||||
int arch_gnttab_init(unsigned long nr_shared, unsigned long nr_status);
|
||||
int arch_gnttab_init(unsigned long nr_shared);
|
||||
int arch_gnttab_map_shared(xen_pfn_t *frames, unsigned long nr_gframes,
|
||||
unsigned long max_nr_gframes,
|
||||
void **__shared);
|
||||
int arch_gnttab_map_status(uint64_t *frames, unsigned long nr_gframes,
|
||||
unsigned long max_nr_gframes,
|
||||
grant_status_t **__shared);
|
||||
void arch_gnttab_unmap(void *shared, unsigned long nr_gframes);
|
||||
|
||||
struct grant_frames {
|
||||
|
|
|
|||
Loading…
Reference in a new issue