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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen master] x86/ioreq_server: make p2m_finish_type_change actually work
commit eb13199100dffba1484aac3e72dc7aac2b42629a
Author: Xiong Zhang <xiong.y.zhang@xxxxxxxxx>
AuthorDate: Wed May 17 17:24:45 2017 +0200
Commit: Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed May 17 17:24:45 2017 +0200
x86/ioreq_server: make p2m_finish_type_change actually work
Commit 6d774a951696 ("x86/ioreq server: synchronously reset outstanding
p2m_ioreq_server entries when an ioreq server unmaps") introduced
p2m_finish_type_change(), which was meant to synchronously finish a
previously initiated type change over a gpfn range. It did this by
calling get_entry(), checking if it was the appropriate type, and then
calling set_entry().
Unfortunately, a previous commit (1679e0df3df6 "x86/ioreq server:
asynchronously reset outstanding p2m_ioreq_server entries") modified
get_entry() to always return the new type after the type change, meaning
that p2m_finish_type_change() never changed any entries. Which means
when an ioreq server was detached and then re-attached (as happens in
XenGT on reboot) the re-attach failed.
Fix this by using the existing p2m-specific recalculation logic instead
of doing a read-check-write loop.
Fix: 'commit 6d774a951696 ("x86/ioreq server: synchronously reset
outstanding p2m_ioreq_server entries when an ioreq server unmaps")'
Signed-off-by: Xiong Zhang <xiong.y.zhang@xxxxxxxxx>
Signed-off-by: Yu Zhang <yu.c.zhang@xxxxxxxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: George Dunlap <george.dunlap@xxxxxxxxxx>
Release-acked-by: Julien Grall <julien.grall@xxxxxxx>
---
xen/arch/x86/hvm/dm.c | 5 +++--
xen/arch/x86/mm/p2m-ept.c | 1 +
xen/arch/x86/mm/p2m-pt.c | 1 +
xen/arch/x86/mm/p2m.c | 35 +++++++++++++++++++++++------------
xen/include/asm-x86/p2m.h | 9 +++++----
5 files changed, 33 insertions(+), 18 deletions(-)
diff --git a/xen/arch/x86/hvm/dm.c b/xen/arch/x86/hvm/dm.c
index b296d2d..4cf6dee 100644
--- a/xen/arch/x86/hvm/dm.c
+++ b/xen/arch/x86/hvm/dm.c
@@ -490,8 +490,9 @@ static int dm_op(const struct dmop_args *op_args)
first_gfn <= p2m->max_mapped_pfn )
{
/* Iterate p2m table for 256 gfns each time. */
- p2m_finish_type_change(d, _gfn(first_gfn), 256,
- p2m_ioreq_server, p2m_ram_rw);
+ rc = p2m_finish_type_change(d, _gfn(first_gfn), 256);
+ if ( rc < 0 )
+ break;
first_gfn += 256;
diff --git a/xen/arch/x86/mm/p2m-ept.c b/xen/arch/x86/mm/p2m-ept.c
index f98121d..ecab56f 100644
--- a/xen/arch/x86/mm/p2m-ept.c
+++ b/xen/arch/x86/mm/p2m-ept.c
@@ -1239,6 +1239,7 @@ int ept_p2m_init(struct p2m_domain *p2m)
p2m->set_entry = ept_set_entry;
p2m->get_entry = ept_get_entry;
+ p2m->recalc = resolve_misconfig;
p2m->change_entry_type_global = ept_change_entry_type_global;
p2m->change_entry_type_range = ept_change_entry_type_range;
p2m->memory_type_changed = ept_memory_type_changed;
diff --git a/xen/arch/x86/mm/p2m-pt.c b/xen/arch/x86/mm/p2m-pt.c
index 5079b59..2eddeee 100644
--- a/xen/arch/x86/mm/p2m-pt.c
+++ b/xen/arch/x86/mm/p2m-pt.c
@@ -1153,6 +1153,7 @@ void p2m_pt_init(struct p2m_domain *p2m)
{
p2m->set_entry = p2m_pt_set_entry;
p2m->get_entry = p2m_pt_get_entry;
+ p2m->recalc = do_recalc;
p2m->change_entry_type_global = p2m_pt_change_entry_type_global;
p2m->change_entry_type_range = p2m_pt_change_entry_type_range;
p2m->write_p2m_entry = paging_write_p2m_entry;
diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index c6ec1a4..9eb6dc8 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -1030,33 +1030,44 @@ void p2m_change_type_range(struct domain *d,
p2m_unlock(p2m);
}
-/* Synchronously modify the p2m type for a range of gfns from ot to nt. */
-void p2m_finish_type_change(struct domain *d,
- gfn_t first_gfn, unsigned long max_nr,
- p2m_type_t ot, p2m_type_t nt)
+/*
+ * Finish p2m type change for gfns which are marked as need_recalc in a range.
+ * Returns: 0/1 for success, negative for failure
+ */
+int p2m_finish_type_change(struct domain *d,
+ gfn_t first_gfn, unsigned long max_nr)
{
struct p2m_domain *p2m = p2m_get_hostp2m(d);
- p2m_type_t t;
unsigned long gfn = gfn_x(first_gfn);
unsigned long last_gfn = gfn + max_nr - 1;
-
- ASSERT(ot != nt);
- ASSERT(p2m_is_changeable(ot) && p2m_is_changeable(nt));
+ int rc = 0;
p2m_lock(p2m);
last_gfn = min(last_gfn, p2m->max_mapped_pfn);
while ( gfn <= last_gfn )
{
- get_gfn_query_unlocked(d, gfn, &t);
-
- if ( t == ot )
- p2m_change_type_one(d, gfn, t, nt);
+ rc = p2m->recalc(p2m, gfn);
+ /*
+ * ept->recalc could return 0/1/-ENOMEM. pt->recalc could return
+ * 0/-ENOMEM/-ENOENT, -ENOENT isn't an error as we are looping
+ * gfn here.
+ */
+ if ( rc == -ENOENT )
+ rc = 0;
+ else if ( rc < 0 )
+ {
+ gdprintk(XENLOG_ERR, "p2m->recalc failed! Dom%d gfn=%lx\n",
+ d->domain_id, gfn);
+ break;
+ }
gfn++;
}
p2m_unlock(p2m);
+
+ return rc;
}
/*
diff --git a/xen/include/asm-x86/p2m.h b/xen/include/asm-x86/p2m.h
index 7574a9b..408f7da 100644
--- a/xen/include/asm-x86/p2m.h
+++ b/xen/include/asm-x86/p2m.h
@@ -246,6 +246,8 @@ struct p2m_domain {
p2m_query_t q,
unsigned int *page_order,
bool_t *sve);
+ int (*recalc)(struct p2m_domain *p2m,
+ unsigned long gfn);
void (*enable_hardware_log_dirty)(struct p2m_domain *p2m);
void (*disable_hardware_log_dirty)(struct p2m_domain *p2m);
void (*flush_hardware_cached_dirty)(struct p2m_domain *p2m);
@@ -607,10 +609,9 @@ int p2m_change_type_one(struct domain *d, unsigned long
gfn,
p2m_type_t ot, p2m_type_t nt);
/* Synchronously change the p2m type for a range of gfns */
-void p2m_finish_type_change(struct domain *d,
- gfn_t first_gfn,
- unsigned long max_nr,
- p2m_type_t ot, p2m_type_t nt);
+int p2m_finish_type_change(struct domain *d,
+ gfn_t first_gfn,
+ unsigned long max_nr);
/* Report a change affecting memory types. */
void p2m_memory_type_changed(struct domain *d);
--
generated by git-patchbot for /home/xen/git/xen.git#master
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