|
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen master] x86/P2M: consolidate handling of types not requiring a valid MFN
commit c35eefded2992fc9b979f99190422527650872fd
Author: Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Nov 20 12:38:33 2015 +0100
Commit: Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Nov 20 12:38:33 2015 +0100
x86/P2M: consolidate handling of types not requiring a valid MFN
As noted regarding the mixture of checks in p2m_pt_set_entry(),
introduce a new P2M type group allowing to be used everywhere we
just care about accepting operations with either a valid MFN or a type
permitting to be used without (valid) MFN.
Note that p2m_mmio_dm is not included in P2M_NO_MFN_TYPES, as for the
intended purpose that one ought to be treated similar to p2m_invalid
(perhaps the two should ultimately get folded anyway).
Note further that PoD superpages now get INVALID_MFN used when creating
page table entries (was _mfn(0) before).
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: George Dunlap <george.dunlap@xxxxxxxxxx>
---
xen/arch/x86/mm/p2m-ept.c | 3 +--
xen/arch/x86/mm/p2m-pod.c | 12 ++++++------
xen/arch/x86/mm/p2m-pt.c | 7 +++----
xen/include/asm-x86/p2m.h | 7 +++++++
4 files changed, 17 insertions(+), 12 deletions(-)
diff --git a/xen/arch/x86/mm/p2m-ept.c b/xen/arch/x86/mm/p2m-ept.c
index 86440fc..8fabb44 100644
--- a/xen/arch/x86/mm/p2m-ept.c
+++ b/xen/arch/x86/mm/p2m-ept.c
@@ -780,8 +780,7 @@ ept_set_entry(struct p2m_domain *p2m, unsigned long gfn,
mfn_t mfn,
ept_entry = table + (gfn_remainder >> (i * EPT_TABLE_ORDER));
}
- if ( mfn_valid(mfn_x(mfn)) || direct_mmio || p2m_is_paged(p2mt) ||
- (p2mt == p2m_ram_paging_in) )
+ if ( mfn_valid(mfn_x(mfn)) || p2m_allows_invalid_mfn(p2mt) )
{
int emt = epte_get_entry_emt(p2m->domain, gfn, mfn,
i * EPT_TABLE_ORDER, &ipat, direct_mmio);
diff --git a/xen/arch/x86/mm/p2m-pod.c b/xen/arch/x86/mm/p2m-pod.c
index 5d23b0d..ea16d3e 100644
--- a/xen/arch/x86/mm/p2m-pod.c
+++ b/xen/arch/x86/mm/p2m-pod.c
@@ -753,7 +753,7 @@ p2m_pod_zero_check_superpage(struct p2m_domain *p2m,
unsigned long gfn)
}
/* Try to remove the page, restoring old mapping if it fails. */
- p2m_set_entry(p2m, gfn, _mfn(0), PAGE_ORDER_2M,
+ p2m_set_entry(p2m, gfn, _mfn(INVALID_MFN), PAGE_ORDER_2M,
p2m_populate_on_demand, p2m->default_access);
/* Make none of the MFNs are used elsewhere... for example, mapped
@@ -869,7 +869,7 @@ p2m_pod_zero_check(struct p2m_domain *p2m, unsigned long
*gfns, int count)
}
/* Try to remove the page, restoring old mapping if it fails. */
- p2m_set_entry(p2m, gfns[i], _mfn(0), PAGE_ORDER_4K,
+ p2m_set_entry(p2m, gfns[i], _mfn(INVALID_MFN), PAGE_ORDER_4K,
p2m_populate_on_demand, p2m->default_access);
/* See if the page was successfully unmapped. (Allow one refcount
@@ -1070,7 +1070,7 @@ p2m_pod_demand_populate(struct p2m_domain *p2m, unsigned
long gfn,
* NOTE: In a fine-grained p2m locking scenario this operation
* may need to promote its locking from gfn->1g superpage
*/
- p2m_set_entry(p2m, gfn_aligned, _mfn(0), PAGE_ORDER_2M,
+ p2m_set_entry(p2m, gfn_aligned, _mfn(INVALID_MFN), PAGE_ORDER_2M,
p2m_populate_on_demand, p2m->default_access);
return 0;
}
@@ -1152,7 +1152,7 @@ remap_and_retry:
* need promoting the gfn lock from gfn->2M superpage */
gfn_aligned = (gfn>>order)<<order;
for(i=0; i<(1<<order); i++)
- p2m_set_entry(p2m, gfn_aligned+i, _mfn(0), PAGE_ORDER_4K,
+ p2m_set_entry(p2m, gfn_aligned + i, _mfn(INVALID_MFN), PAGE_ORDER_4K,
p2m_populate_on_demand, p2m->default_access);
if ( tb_init_done )
{
@@ -1210,8 +1210,8 @@ guest_physmap_mark_populate_on_demand(struct domain *d,
unsigned long gfn,
}
/* Now, actually do the two-way mapping */
- rc = p2m_set_entry(p2m, gfn, _mfn(0), order, p2m_populate_on_demand,
- p2m->default_access);
+ rc = p2m_set_entry(p2m, gfn, _mfn(INVALID_MFN), order,
+ p2m_populate_on_demand, p2m->default_access);
if ( rc == 0 )
{
pod_lock(p2m);
diff --git a/xen/arch/x86/mm/p2m-pt.c b/xen/arch/x86/mm/p2m-pt.c
index 28a31ee..0a7bee4 100644
--- a/xen/arch/x86/mm/p2m-pt.c
+++ b/xen/arch/x86/mm/p2m-pt.c
@@ -571,7 +571,7 @@ p2m_pt_set_entry(struct p2m_domain *p2m, unsigned long gfn,
mfn_t mfn,
}
ASSERT(!mfn_valid(mfn) || p2mt != p2m_mmio_direct);
- l3e_content = mfn_valid(mfn)
+ l3e_content = mfn_valid(mfn) || p2m_allows_invalid_mfn(p2mt)
? l3e_from_pfn(mfn_x(mfn),
p2m_type_to_flags(p2mt, mfn) | _PAGE_PSE)
: l3e_empty();
@@ -607,8 +607,7 @@ p2m_pt_set_entry(struct p2m_domain *p2m, unsigned long gfn,
mfn_t mfn,
p2m_get_iommu_flags(p2m_flags_to_type(l1e_get_flags(*p2m_entry)));
old_mfn = l1e_get_pfn(*p2m_entry);
- if ( mfn_valid(mfn) || (p2mt == p2m_mmio_direct)
- || p2m_is_paging(p2mt) )
+ if ( mfn_valid(mfn) || p2m_allows_invalid_mfn(p2mt) )
entry_content = p2m_l1e_from_pfn(mfn_x(mfn),
p2m_type_to_flags(p2mt, mfn));
else
@@ -644,7 +643,7 @@ p2m_pt_set_entry(struct p2m_domain *p2m, unsigned long gfn,
mfn_t mfn,
}
ASSERT(!mfn_valid(mfn) || p2mt != p2m_mmio_direct);
- if ( mfn_valid(mfn) || p2m_is_pod(p2mt) )
+ if ( mfn_valid(mfn) || p2m_allows_invalid_mfn(p2mt) )
l2e_content = l2e_from_pfn(mfn_x(mfn),
p2m_type_to_flags(p2mt, mfn) |
_PAGE_PSE);
diff --git a/xen/include/asm-x86/p2m.h b/xen/include/asm-x86/p2m.h
index d748557..fa46dd9 100644
--- a/xen/include/asm-x86/p2m.h
+++ b/xen/include/asm-x86/p2m.h
@@ -141,6 +141,11 @@ typedef unsigned int p2m_query_t;
| p2m_to_mask(p2m_ram_logdirty) )
#define P2M_SHARED_TYPES (p2m_to_mask(p2m_ram_shared))
+/* Valid types not necessarily associated with a (valid) MFN. */
+#define P2M_INVALID_MFN_TYPES (P2M_POD_TYPES \
+ | p2m_to_mask(p2m_mmio_direct) \
+ | P2M_PAGING_TYPES)
+
/* Broken type: the frame backing this pfn has failed in hardware
* and must not be touched. */
#define P2M_BROKEN_TYPES (p2m_to_mask(p2m_ram_broken))
@@ -171,6 +176,8 @@ typedef unsigned int p2m_query_t;
(P2M_RAM_TYPES | P2M_GRANT_TYPES | \
p2m_to_mask(p2m_map_foreign)))
+#define p2m_allows_invalid_mfn(t) (p2m_to_mask(t) & P2M_INVALID_MFN_TYPES)
+
typedef enum {
p2m_host,
p2m_nested,
--
generated by git-patchbot for /home/xen/git/xen.git#master
_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxx
http://lists.xensource.com/xen-changelog
|
 |
Lists.xenproject.org is hosted with RackSpace, monitoring our |