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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH RFC] xen/libxl/libxl: RIP PV superpage.
The last bastion of users is moving away from needing
this.
Please note that there was an partial removal by
c/s 9b3c6b13e0c085ceb53210f8e682a073096b94fa
"libxc: remove superpages option for pv domains" so an user
could not even run PV guests with superpage.
HVM guests are not affected - they have been able to use
superpages (called hugepages) if the CPU supports 2MB or 1GB
since Xen 3.3.
This is reported in the ring buffer:
(XEN) HVM: HAP page sizes: 4kB, 2MB, 1GB
AMD CPUs that support 2MB require NPT aka Rapid Virtualization
Indexing. This was introduced in third generation Opteron -
Barcelona.
Intel CPUs that support 2MB require EPT aka Extended Page Tables.
This was introduced in Westmere microarchitecture.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
docs/misc/xen-command-line.markdown | 7 --
tools/libxc/include/xenguest.h | 3 +-
tools/libxc/xc_nomigrate.c | 2 +-
tools/libxc/xc_sr_restore.c | 6 +-
tools/libxl/libxl_internal.h | 2 +-
tools/libxl/libxl_save_callout.c | 4 +-
tools/libxl/libxl_save_helper.c | 3 +-
tools/libxl/libxl_stream_read.c | 2 +-
xen/arch/x86/domain.c | 2 -
xen/arch/x86/domain_build.c | 2 -
xen/arch/x86/mm.c | 241 ++----------------------------------
xen/include/asm-x86/config.h | 9 +-
xen/include/asm-x86/guest_pt.h | 4 +-
xen/include/asm-x86/mm.h | 19 ---
xen/include/public/xen.h | 4 +-
15 files changed, 23 insertions(+), 287 deletions(-)
diff --git a/docs/misc/xen-command-line.markdown
b/docs/misc/xen-command-line.markdown
index d267a04..6ea89b0 100644
--- a/docs/misc/xen-command-line.markdown
+++ b/docs/misc/xen-command-line.markdown
@@ -133,13 +133,6 @@ resume.
`s3_mode` instructs Xen to set up the boot time (option `vga=`) video
mode during S3 resume.
-### allowsuperpage
-> `= <boolean>`
-
-> Default: `true`
-
-Permit Xen to use superpages when performing memory management.
-
### altp2m (Intel)
> `= <boolean>`
diff --git a/tools/libxc/include/xenguest.h b/tools/libxc/include/xenguest.h
index d48b3ff..11ea79b 100644
--- a/tools/libxc/include/xenguest.h
+++ b/tools/libxc/include/xenguest.h
@@ -113,7 +113,6 @@ struct restore_callbacks {
* @parm store_mfn returned with the mfn of the store page
* @parm hvm non-zero if this is a HVM restore
* @parm pae non-zero if this HVM domain has PAE support enabled
- * @parm superpages non-zero to allocate guest memory with superpages
* @parm checkpointed_stream non-zero if the far end of the stream is using
checkpointing
* @parm callbacks non-NULL to receive a callback to restore toolstack
* specific data
@@ -123,7 +122,7 @@ int xc_domain_restore(xc_interface *xch, int io_fd,
uint32_t dom,
unsigned int store_evtchn, unsigned long *store_mfn,
domid_t store_domid, unsigned int console_evtchn,
unsigned long *console_mfn, domid_t console_domid,
- unsigned int hvm, unsigned int pae, int superpages,
+ unsigned int hvm, unsigned int pae,
int checkpointed_stream,
struct restore_callbacks *callbacks);
diff --git a/tools/libxc/xc_nomigrate.c b/tools/libxc/xc_nomigrate.c
index 902429e..1bb4477 100644
--- a/tools/libxc/xc_nomigrate.c
+++ b/tools/libxc/xc_nomigrate.c
@@ -32,7 +32,7 @@ int xc_domain_restore(xc_interface *xch, int io_fd, uint32_t
dom,
unsigned int store_evtchn, unsigned long *store_mfn,
domid_t store_domid, unsigned int console_evtchn,
unsigned long *console_mfn, domid_t console_domid,
- unsigned int hvm, unsigned int pae, int superpages,
+ unsigned int hvm, unsigned int pae,
int checkpointed_stream,
struct restore_callbacks *callbacks)
{
diff --git a/tools/libxc/xc_sr_restore.c b/tools/libxc/xc_sr_restore.c
index d4d33fd..c8b7d1f 100644
--- a/tools/libxc/xc_sr_restore.c
+++ b/tools/libxc/xc_sr_restore.c
@@ -724,7 +724,7 @@ int xc_domain_restore(xc_interface *xch, int io_fd,
uint32_t dom,
unsigned int store_evtchn, unsigned long *store_mfn,
domid_t store_domid, unsigned int console_evtchn,
unsigned long *console_gfn, domid_t console_domid,
- unsigned int hvm, unsigned int pae, int superpages,
+ unsigned int hvm, unsigned int pae,
int checkpointed_stream,
struct restore_callbacks *callbacks)
{
@@ -746,9 +746,9 @@ int xc_domain_restore(xc_interface *xch, int io_fd,
uint32_t dom,
if ( checkpointed_stream )
assert(callbacks->checkpoint);
- DPRINTF("fd %d, dom %u, hvm %u, pae %u, superpages %d"
+ DPRINTF("fd %d, dom %u, hvm %u, pae %u"
", checkpointed_stream %d", io_fd, dom, hvm, pae,
- superpages, checkpointed_stream);
+ checkpointed_stream);
if ( xc_domain_getinfo(xch, dom, 1, &ctx.dominfo) != 1 )
{
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index b194e65..a6d167d 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -3478,7 +3478,7 @@ _hidden int libxl__restore_emulator_xenstore_data
_hidden void libxl__xc_domain_restore(libxl__egc *egc,
libxl__domain_create_state *dcs,
libxl__save_helper_state *shs,
- int hvm, int pae, int superpages);
+ int hvm, int pae);
/* If rc==0 then retval is the return value from xc_domain_save
* and errnoval is the errno value it provided.
* If rc!=0, retval and errnoval are undefined. */
diff --git a/tools/libxl/libxl_save_callout.c b/tools/libxl/libxl_save_callout.c
index 45b9727..0b60422 100644
--- a/tools/libxl/libxl_save_callout.c
+++ b/tools/libxl/libxl_save_callout.c
@@ -43,7 +43,7 @@ static void helper_done(libxl__egc *egc,
libxl__save_helper_state *shs);
void libxl__xc_domain_restore(libxl__egc *egc, libxl__domain_create_state *dcs,
libxl__save_helper_state *shs,
- int hvm, int pae, int superpages)
+ int hvm, int pae)
{
STATE_AO_GC(dcs->ao);
@@ -60,7 +60,7 @@ void libxl__xc_domain_restore(libxl__egc *egc,
libxl__domain_create_state *dcs,
state->store_port,
state->store_domid, state->console_port,
state->console_domid,
- hvm, pae, superpages,
+ hvm, pae,
cbflags, dcs->restore_params.checkpointed_stream,
};
diff --git a/tools/libxl/libxl_save_helper.c b/tools/libxl/libxl_save_helper.c
index 39038f9..d1bb5b9 100644
--- a/tools/libxl/libxl_save_helper.c
+++ b/tools/libxl/libxl_save_helper.c
@@ -274,7 +274,6 @@ int main(int argc, char **argv)
domid_t console_domid = strtoul(NEXTARG,0,10);
unsigned int hvm = strtoul(NEXTARG,0,10);
unsigned int pae = strtoul(NEXTARG,0,10);
- int superpages = strtoul(NEXTARG,0,10);
unsigned cbflags = strtoul(NEXTARG,0,10);
int checkpointed = strtoul(NEXTARG,0,10);
assert(!*++argv);
@@ -289,7 +288,7 @@ int main(int argc, char **argv)
r = xc_domain_restore(xch, io_fd, dom, store_evtchn, &store_mfn,
store_domid, console_evtchn, &console_mfn,
- console_domid, hvm, pae, superpages,
+ console_domid, hvm, pae,
checkpointed,
&helper_restore_callbacks);
helper_stub_restore_results(store_mfn,console_mfn,0);
diff --git a/tools/libxl/libxl_stream_read.c b/tools/libxl/libxl_stream_read.c
index dac134e..3be8b91 100644
--- a/tools/libxl/libxl_stream_read.c
+++ b/tools/libxl/libxl_stream_read.c
@@ -549,7 +549,7 @@ static bool process_record(libxl__egc *egc,
break;
case REC_TYPE_LIBXC_CONTEXT:
- libxl__xc_domain_restore(egc, dcs, &stream->shs, 0, 0, 0);
+ libxl__xc_domain_restore(egc, dcs, &stream->shs, 0, 0);
break;
case REC_TYPE_EMULATOR_XENSTORE_DATA:
diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 352c194..5f800f6 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -2327,8 +2327,6 @@ static int relinquish_memory(
BUG();
}
- clear_superpage_mark(page);
-
if ( test_and_clear_bit(_PGC_allocated, &page->count_info) )
put_page(page);
diff --git a/xen/arch/x86/domain_build.c b/xen/arch/x86/domain_build.c
index cb287f0..7ee1227 100644
--- a/xen/arch/x86/domain_build.c
+++ b/xen/arch/x86/domain_build.c
@@ -828,8 +828,6 @@ static __init void setup_pv_physmap(struct domain *d,
unsigned long pgtbl_pfn,
0)) != NULL )
{
*pl2e = l2e_from_page(page, L1_PROT|_PAGE_DIRTY|_PAGE_PSE);
- if ( opt_allow_superpage )
- get_superpage(page_to_mfn(page), d);
vphysmap_start += 1UL << L2_PAGETABLE_SHIFT;
continue;
}
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 1ee431e..5a529f2 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -152,18 +152,13 @@ struct rangeset *__read_mostly mmio_ro_ranges;
#define PAGE_CACHE_ATTRS (_PAGE_PAT|_PAGE_PCD|_PAGE_PWT)
-bool_t __read_mostly opt_allow_superpage;
-boolean_param("allowsuperpage", opt_allow_superpage);
-
static void put_superpage(unsigned long mfn);
static uint32_t base_disallow_mask;
/* Global bit is allowed to be set on L1 PTEs. Intended for user mappings. */
#define L1_DISALLOW_MASK ((base_disallow_mask | _PAGE_GNTTAB) & ~_PAGE_GLOBAL)
-#define L2_DISALLOW_MASK (unlikely(opt_allow_superpage) \
- ? base_disallow_mask & ~_PAGE_PSE \
- : base_disallow_mask)
+#define L2_DISALLOW_MASK (base_disallow_mask)
#define l3_disallow_mask(d) (!is_pv_32bit_domain(d) ? \
base_disallow_mask : 0xFFFFF198U)
@@ -209,15 +204,6 @@ static void __init init_frametable_chunk(void *start, void
*end)
memset(end, -1, s - e);
}
-static void __init init_spagetable(void)
-{
- BUILD_BUG_ON(XEN_VIRT_END > SPAGETABLE_VIRT_START);
-
- init_frametable_chunk(spage_table,
- mem_hotplug ? spage_table + SPAGETABLE_NR
- : pdx_to_spage(max_pdx - 1) + 1);
-}
-
void __init init_frametable(void)
{
unsigned int sidx, eidx, nidx;
@@ -242,9 +228,6 @@ void __init init_frametable(void)
: end_pg;
init_frametable_chunk(pdx_to_page(sidx * PDX_GROUP_COUNT), top_pg);
memset(end_pg, -1, (unsigned long)top_pg - (unsigned long)end_pg);
-
- if (opt_allow_superpage)
- init_spagetable();
}
#ifndef NDEBUG
@@ -985,20 +968,7 @@ get_page_from_l2e(
return rc;
}
- if ( !opt_allow_superpage )
- {
- MEM_LOG("Attempt to map superpage without allowsuperpage "
- "flag in hypervisor");
- return -EINVAL;
- }
-
- if ( mfn & (L1_PAGETABLE_ENTRIES-1) )
- {
- MEM_LOG("Unaligned superpage map attempt mfn %lx", mfn);
- return -EINVAL;
- }
-
- return get_superpage(mfn, d);
+ return -EINVAL;
}
@@ -1853,10 +1823,7 @@ static int mod_l2_entry(l2_pgentry_t *pl2e,
}
/* Fast path for identical mapping and presence. */
- if ( !l2e_has_changed(ol2e, nl2e,
- unlikely(opt_allow_superpage)
- ? _PAGE_PSE | _PAGE_RW | _PAGE_PRESENT
- : _PAGE_PRESENT) )
+ if ( !l2e_has_changed(ol2e, nl2e, _PAGE_PRESENT) )
{
adjust_guest_l2e(nl2e, d);
if ( UPDATE_ENTRY(l2, pl2e, ol2e, nl2e, pfn, vcpu, preserve_ad) )
@@ -2511,22 +2478,6 @@ int get_page_type_preemptible(struct page_info *page,
unsigned long type)
return __get_page_type(page, type, 1);
}
-static int get_spage_pages(struct page_info *page, struct domain *d)
-{
- int i;
-
- for (i = 0; i < (1<<PAGETABLE_ORDER); i++, page++)
- {
- if (!get_page_and_type(page, d, PGT_writable_page))
- {
- while (--i >= 0)
- put_page_and_type(--page);
- return 0;
- }
- }
- return 1;
-}
-
static void put_spage_pages(struct page_info *page)
{
int i;
@@ -2538,167 +2489,10 @@ static void put_spage_pages(struct page_info *page)
return;
}
-static int mark_superpage(struct spage_info *spage, struct domain *d)
-{
- unsigned long x, nx, y = spage->type_info;
- int pages_done = 0;
-
- ASSERT(opt_allow_superpage);
-
- do {
- x = y;
- nx = x + 1;
- if ( (x & SGT_type_mask) == SGT_mark )
- {
- MEM_LOG("Duplicate superpage mark attempt mfn %lx",
- spage_to_mfn(spage));
- if ( pages_done )
- put_spage_pages(spage_to_page(spage));
- return -EINVAL;
- }
- if ( (x & SGT_type_mask) == SGT_dynamic )
- {
- if ( pages_done )
- {
- put_spage_pages(spage_to_page(spage));
- pages_done = 0;
- }
- }
- else if ( !pages_done )
- {
- if ( !get_spage_pages(spage_to_page(spage), d) )
- {
- MEM_LOG("Superpage type conflict in mark attempt mfn %lx",
- spage_to_mfn(spage));
- return -EINVAL;
- }
- pages_done = 1;
- }
- nx = (nx & ~SGT_type_mask) | SGT_mark;
-
- } while ( (y = cmpxchg(&spage->type_info, x, nx)) != x );
-
- return 0;
-}
-
-static int unmark_superpage(struct spage_info *spage)
-{
- unsigned long x, nx, y = spage->type_info;
- unsigned long do_pages = 0;
-
- ASSERT(opt_allow_superpage);
-
- do {
- x = y;
- nx = x - 1;
- if ( (x & SGT_type_mask) != SGT_mark )
- {
- MEM_LOG("Attempt to unmark unmarked superpage mfn %lx",
- spage_to_mfn(spage));
- return -EINVAL;
- }
- if ( (nx & SGT_count_mask) == 0 )
- {
- nx = (nx & ~SGT_type_mask) | SGT_none;
- do_pages = 1;
- }
- else
- {
- nx = (nx & ~SGT_type_mask) | SGT_dynamic;
- }
- } while ( (y = cmpxchg(&spage->type_info, x, nx)) != x );
-
- if ( do_pages )
- put_spage_pages(spage_to_page(spage));
-
- return 0;
-}
-
-void clear_superpage_mark(struct page_info *page)
-{
- struct spage_info *spage;
-
- if ( !opt_allow_superpage )
- return;
-
- spage = page_to_spage(page);
- if ((spage->type_info & SGT_type_mask) == SGT_mark)
- unmark_superpage(spage);
-
-}
-
-int get_superpage(unsigned long mfn, struct domain *d)
-{
- struct spage_info *spage;
- unsigned long x, nx, y;
- int pages_done = 0;
-
- ASSERT(opt_allow_superpage);
-
- if ( !mfn_valid(mfn | (L1_PAGETABLE_ENTRIES - 1)) )
- return -EINVAL;
-
- spage = mfn_to_spage(mfn);
- y = spage->type_info;
- do {
- x = y;
- nx = x + 1;
- if ( (x & SGT_type_mask) != SGT_none )
- {
- if ( pages_done )
- {
- put_spage_pages(spage_to_page(spage));
- pages_done = 0;
- }
- }
- else
- {
- if ( !get_spage_pages(spage_to_page(spage), d) )
- {
- MEM_LOG("Type conflict on superpage mapping mfn %lx",
- spage_to_mfn(spage));
- return -EINVAL;
- }
- pages_done = 1;
- nx = (nx & ~SGT_type_mask) | SGT_dynamic;
- }
- } while ( (y = cmpxchg(&spage->type_info, x, nx)) != x );
-
- return 0;
-}
-
static void put_superpage(unsigned long mfn)
{
- struct spage_info *spage;
- unsigned long x, nx, y;
- unsigned long do_pages = 0;
-
- if ( !opt_allow_superpage )
- {
- put_spage_pages(mfn_to_page(mfn));
- return;
- }
-
- spage = mfn_to_spage(mfn);
- y = spage->type_info;
- do {
- x = y;
- nx = x - 1;
- if ((x & SGT_type_mask) == SGT_dynamic)
- {
- if ((nx & SGT_count_mask) == 0)
- {
- nx = (nx & ~SGT_type_mask) | SGT_none;
- do_pages = 1;
- }
- }
-
- } while ((y = cmpxchg(&spage->type_info, x, nx)) != x);
-
- if (do_pages)
- put_spage_pages(spage_to_page(spage));
-
- return;
+ ASSERT(1); /* This should really not be called. */
+ put_spage_pages(mfn_to_page(mfn));
}
int put_old_guest_table(struct vcpu *v)
@@ -3437,29 +3231,8 @@ long do_mmuext_op(
case MMUEXT_MARK_SUPER:
case MMUEXT_UNMARK_SUPER:
- {
- unsigned long mfn = op.arg1.mfn;
-
- if ( !opt_allow_superpage )
- {
- MEM_LOG("Superpages disallowed");
- rc = -ENOSYS;
- }
- else if ( unlikely(d != pg_owner) )
- rc = -EPERM;
- else if ( mfn & (L1_PAGETABLE_ENTRIES - 1) )
- {
- MEM_LOG("Unaligned superpage reference mfn %lx", mfn);
- rc = -EINVAL;
- }
- else if ( !mfn_valid(mfn | (L1_PAGETABLE_ENTRIES - 1)) )
- rc = -EINVAL;
- else if ( op.cmd == MMUEXT_MARK_SUPER )
- rc = mark_superpage(mfn_to_spage(mfn), d);
- else
- rc = unmark_superpage(mfn_to_spage(mfn));
- break;
- }
+ MEM_LOG("Superpages are deprecated.");
+ rc = -ENOSYS;
default:
MEM_LOG("Invalid extended pt command %#x", op.cmd);
diff --git a/xen/include/asm-x86/config.h b/xen/include/asm-x86/config.h
index d97877d..eb08aa2 100644
--- a/xen/include/asm-x86/config.h
+++ b/xen/include/asm-x86/config.h
@@ -239,13 +239,8 @@ extern unsigned char boot_edid_info[128];
#define XEN_VIRT_START (HIRO_COMPAT_MPT_VIRT_END)
#define XEN_VIRT_END (XEN_VIRT_START + GB(1))
-/* Slot 261: superpage information array (64MB or 512MB). */
-#define SPAGETABLE_VIRT_END FRAMETABLE_VIRT_START
-#define SPAGETABLE_NR (((FRAMETABLE_NR - 1) >> (SUPERPAGE_SHIFT - \
- PAGE_SHIFT)) + 1)
-#define SPAGETABLE_SIZE (SPAGETABLE_NR * sizeof(struct spage_info))
-#define SPAGETABLE_VIRT_START ((SPAGETABLE_VIRT_END - SPAGETABLE_SIZE) & \
- (_AC(-1,UL) << SUPERPAGE_SHIFT))
+/* Slot 261: superpage information array (64MB or 512MB).
+ * Now free. */
#ifndef CONFIG_BIGMEM
/* Slot 261: page-frame information array (128GB). */
diff --git a/xen/include/asm-x86/guest_pt.h b/xen/include/asm-x86/guest_pt.h
index 3447973..c163af6 100644
--- a/xen/include/asm-x86/guest_pt.h
+++ b/xen/include/asm-x86/guest_pt.h
@@ -186,9 +186,7 @@ guest_supports_superpages(struct vcpu *v)
/* The _PAGE_PSE bit must be honoured in HVM guests, whenever
* CR4.PSE is set or the guest is in PAE or long mode.
* It's also used in the dummy PT for vcpus with CR4.PG cleared. */
- return (is_pv_vcpu(v)
- ? opt_allow_superpage
- : (GUEST_PAGING_LEVELS != 2
+ return (is_pv_vcpu(v) ? 0 /* Deprecated. */ : (GUEST_PAGING_LEVELS != 2
|| !hvm_paging_enabled(v)
|| (v->arch.hvm_vcpu.guest_cr[4] & X86_CR4_PSE)));
}
diff --git a/xen/include/asm-x86/mm.h b/xen/include/asm-x86/mm.h
index 7598414..7a0d258 100644
--- a/xen/include/asm-x86/mm.h
+++ b/xen/include/asm-x86/mm.h
@@ -233,21 +233,6 @@ struct page_info
#define PGC_count_width PG_shift(9)
#define PGC_count_mask ((1UL<<PGC_count_width)-1)
-struct spage_info
-{
- unsigned long type_info;
-};
-
- /* The following page types are MUTUALLY EXCLUSIVE. */
-#define SGT_none PG_mask(0, 2) /* superpage not in use */
-#define SGT_mark PG_mask(1, 2) /* Marked as a superpage */
-#define SGT_dynamic PG_mask(2, 2) /* has been dynamically mapped as a
superpage */
-#define SGT_type_mask PG_mask(3, 2) /* Bits 30-31 or 62-63. */
-
- /* Count of uses of this superpage as its current type. */
-#define SGT_count_width PG_shift(3)
-#define SGT_count_mask ((1UL<<SGT_count_width)-1)
-
#define is_xen_heap_page(page) ((page)->count_info & PGC_xen_heap)
#define is_xen_heap_mfn(mfn) \
(__mfn_valid(mfn) && is_xen_heap_page(__mfn_to_page(mfn)))
@@ -281,7 +266,6 @@ extern void free_shared_domheap_page(struct page_info
*page);
#define frame_table ((struct page_info *)FRAMETABLE_VIRT_START)
#define spage_table ((struct spage_info *)SPAGETABLE_VIRT_START)
-int get_superpage(unsigned long mfn, struct domain *d);
extern unsigned long max_page;
extern unsigned long total_pages;
void init_frametable(void);
@@ -327,8 +311,6 @@ void zap_ro_mpt(unsigned long mfn);
int is_iomem_page(unsigned long mfn);
-void clear_superpage_mark(struct page_info *page);
-
const unsigned long *get_platform_badpages(unsigned int *array_size);
/* Per page locks:
* page_lock() is used for two purposes: pte serialization, and memory sharing.
@@ -402,7 +384,6 @@ static inline int get_page_and_type(struct page_info *page,
int check_descriptor(const struct domain *, struct desc_struct *d);
-extern bool_t opt_allow_superpage;
extern paddr_t mem_hotplug;
/******************************************************************************
diff --git a/xen/include/public/xen.h b/xen/include/public/xen.h
index 7b629b1..c3b290d 100644
--- a/xen/include/public/xen.h
+++ b/xen/include/public/xen.h
@@ -272,7 +272,8 @@ DEFINE_XEN_GUEST_HANDLE(xen_ulong_t);
* The one bits that does not fit with the default layout is the PAGE_PSE
* also called PAGE_PAT). The MMUEXT_[UN]MARK_SUPER arguments to the
* HYPERVISOR_mmuext_op serve as mechanism to set a pagetable to be 4MB
- * (or 2MB) instead of using the PAGE_PSE bit.
+ * (or 2MB) instead of using the PAGE_PSE bit. That functionality is now
+ * deprecated and will return -ENOSYS.
*
* The reason that the PAGE_PSE (bit 7) is not being utilized is due to Xen
* using it as the Page Attribute Table (PAT) bit - for details on it please
@@ -382,6 +383,7 @@ DEFINE_XEN_GUEST_HANDLE(xen_ulong_t);
*
* cmd: MMUEXT_[UN]MARK_SUPER
* mfn: Machine frame number of head of superpage to be [un]marked.
+ * These sub-ops are deprecated and will return -ENOSYS.
*/
/* ` enum mmuext_cmd { */
#define MMUEXT_PIN_L1_TABLE 0
--
2.1.0
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