* [PATCH v8 00/11] x86: guest resource mapping
@ 2017-09-29 14:51 Paul Durrant
2017-09-29 14:51 ` [PATCH v8 01/11] x86/hvm/ioreq: maintain an array of ioreq servers rather than a list Paul Durrant
` (10 more replies)
0 siblings, 11 replies; 17+ messages in thread
From: Paul Durrant @ 2017-09-29 14:51 UTC (permalink / raw)
To: xen-devel
Cc: Stefano Stabellini, Wei Liu, George Dunlap, Andrew Cooper,
Ian Jackson, Tim Deegan, Paul Durrant, Jan Beulich
This series introduces support for direct mapping of guest resources.
The resources are:
- IOREQ server pages
- Grant tables
v8:
- Re-ordered series and dropped two patches that have already been
committed.
v7:
- Fixed assertion failure hit during domain destroy.
v6:
- Responded to missed comments from Roger.
v5:
- Responded to review comments from Wei.
v4:
- Responded to further review comments from Roger.
v3:
- Dropped original patch #1 since it is covered by Juergen's patch.
- Added new xenforeignmemorycleanup patch (#4).
- Replaced the patch introducing the ioreq server 'is_default' flag with one
that changes the ioreq server list into an array (#8).
Paul Durrant (11):
x86/hvm/ioreq: maintain an array of ioreq servers rather than a list
x86/hvm/ioreq: simplify code and use consistent naming
x86/hvm/ioreq: use gfn_t in struct hvm_ioreq_page
x86/hvm/ioreq: defer mapping gfns until they are actually requsted
x86/mm: add HYPERVISOR_memory_op to acquire guest resources
x86/hvm/ioreq: add a new mappable resource type...
x86/mm: add an extra command to HYPERVISOR_mmu_update...
tools/libxenforeignmemory: add support for resource mapping
tools/libxenforeignmemory: reduce xenforeignmemory_restrict code
footprint
common: add a new mappable resource type: XENMEM_resource_grant_table
tools/libxenctrl: use new xenforeignmemory API to seed grant table
tools/include/xen-sys/Linux/privcmd.h | 11 +
tools/libs/devicemodel/core.c | 8 +
tools/libs/devicemodel/include/xendevicemodel.h | 6 +-
tools/libs/foreignmemory/Makefile | 2 +-
tools/libs/foreignmemory/core.c | 53 ++
tools/libs/foreignmemory/freebsd.c | 7 -
.../libs/foreignmemory/include/xenforeignmemory.h | 41 +
tools/libs/foreignmemory/libxenforeignmemory.map | 5 +
tools/libs/foreignmemory/linux.c | 45 ++
tools/libs/foreignmemory/minios.c | 7 -
tools/libs/foreignmemory/netbsd.c | 7 -
tools/libs/foreignmemory/private.h | 43 +-
tools/libs/foreignmemory/solaris.c | 7 -
tools/libxc/include/xc_dom.h | 8 +-
tools/libxc/xc_dom_boot.c | 114 ++-
tools/libxc/xc_sr_restore_x86_hvm.c | 10 +-
tools/libxc/xc_sr_restore_x86_pv.c | 2 +-
tools/libxl/libxl_dom.c | 1 -
tools/python/xen/lowlevel/xc/xc.c | 6 +-
xen/arch/x86/hvm/dm.c | 9 +-
xen/arch/x86/hvm/ioreq.c | 840 ++++++++++++---------
xen/arch/x86/mm.c | 39 +-
xen/arch/x86/mm/p2m.c | 3 +-
xen/common/compat/memory.c | 52 ++
xen/common/grant_table.c | 32 +-
xen/common/memory.c | 112 +++
xen/include/asm-x86/hvm/domain.h | 14 +-
xen/include/asm-x86/hvm/ioreq.h | 6 +
xen/include/asm-x86/mm.h | 5 +
xen/include/asm-x86/p2m.h | 3 +
xen/include/public/hvm/dm_op.h | 36 +-
xen/include/public/memory.h | 48 +-
xen/include/public/xen.h | 12 +-
xen/include/xen/grant_table.h | 1 +
xen/include/xlat.lst | 1 +
35 files changed, 1105 insertions(+), 491 deletions(-)
---
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: George Dunlap <george.dunlap@eu.citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Tim Deegan <tim@xen.org>
Cc: Wei Liu <wei.liu2@citrix.com>
--
2.11.0
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 17+ messages in thread
* [PATCH v8 01/11] x86/hvm/ioreq: maintain an array of ioreq servers rather than a list
2017-09-29 14:51 [PATCH v8 00/11] x86: guest resource mapping Paul Durrant
@ 2017-09-29 14:51 ` Paul Durrant
2017-09-29 15:35 ` Andrew Cooper
2017-09-29 14:51 ` [PATCH v8 02/11] x86/hvm/ioreq: simplify code and use consistent naming Paul Durrant
` (9 subsequent siblings)
10 siblings, 1 reply; 17+ messages in thread
From: Paul Durrant @ 2017-09-29 14:51 UTC (permalink / raw)
To: xen-devel; +Cc: Andrew Cooper, Paul Durrant, Jan Beulich
A subsequent patch will remove the current implicit limitation on creation
of ioreq servers which is due to the allocation of gfns for the ioreq
structures and buffered ioreq ring.
It will therefore be necessary to introduce an explicit limit and, since
this limit should be small, it simplifies the code to maintain an array of
that size rather than using a list.
Also, by reserving an array slot for the default server and populating
array slots early in create, the need to pass an 'is_default' boolean
to sub-functions can be avoided.
Some function return values are changed by this patch: Specifically, in
the case where the id of the default ioreq server is passed in, -EOPNOTSUPP
is now returned rather than -ENOENT.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
---
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
v8:
- Addressed various comments from Jan.
v7:
- Fixed assertion failure found in testing.
v6:
- Updated according to comments made by Roger on v4 that I'd missed.
v5:
- Switched GET/SET_IOREQ_SERVER() macros to get/set_ioreq_server()
functions to avoid possible double-evaluation issues.
v4:
- Introduced more helper macros and relocated them to the top of the
code.
v3:
- New patch (replacing "move is_default into struct hvm_ioreq_server") in
response to review comments.
---
xen/arch/x86/hvm/ioreq.c | 525 ++++++++++++++++++++-------------------
xen/include/asm-x86/hvm/domain.h | 10 +-
2 files changed, 270 insertions(+), 265 deletions(-)
diff --git a/xen/arch/x86/hvm/ioreq.c b/xen/arch/x86/hvm/ioreq.c
index f2e0b3f74a..e655d2eab3 100644
--- a/xen/arch/x86/hvm/ioreq.c
+++ b/xen/arch/x86/hvm/ioreq.c
@@ -33,6 +33,41 @@
#include <public/hvm/ioreq.h>
+static void set_ioreq_server(struct domain *d, unsigned int id,
+ struct hvm_ioreq_server *s)
+{
+ ASSERT(id < MAX_NR_IOREQ_SERVERS);
+ ASSERT(!s || !d->arch.hvm_domain.ioreq_server.server[id]);
+
+ d->arch.hvm_domain.ioreq_server.server[id] = s;
+}
+
+#define GET_IOREQ_SERVER(d, id) \
+ (d)->arch.hvm_domain.ioreq_server.server[id]
+
+static struct hvm_ioreq_server *get_ioreq_server(const struct domain *d,
+ unsigned int id)
+{
+ if ( id >= MAX_NR_IOREQ_SERVERS )
+ return NULL;
+
+ return GET_IOREQ_SERVER(d, id);
+}
+
+#define IS_DEFAULT(s) \
+ ((s) == get_ioreq_server((s)->domain, DEFAULT_IOSERVID))
+
+/*
+ * Iterate over all possible ioreq servers. The use of inline function
+ * get_ioreq_server() in the increment is deliberate as use of the
+ * GET_IOREQ_SERVER() macro will cause gcc to complain about an array
+ * overflow.
+ */
+#define FOR_EACH_IOREQ_SERVER(d, id, s) \
+ for ( (id) = 0, (s) = GET_IOREQ_SERVER(d, 0); \
+ (id) < MAX_NR_IOREQ_SERVERS; \
+ (s) = get_ioreq_server(d, ++(id)) )
+
static ioreq_t *get_ioreq(struct hvm_ioreq_server *s, struct vcpu *v)
{
shared_iopage_t *p = s->ioreq.va;
@@ -47,13 +82,15 @@ bool hvm_io_pending(struct vcpu *v)
{
struct domain *d = v->domain;
struct hvm_ioreq_server *s;
+ unsigned int id;
- list_for_each_entry ( s,
- &d->arch.hvm_domain.ioreq_server.list,
- list_entry )
+ FOR_EACH_IOREQ_SERVER(d, id, s)
{
struct hvm_ioreq_vcpu *sv;
+ if ( !s )
+ continue;
+
list_for_each_entry ( sv,
&s->ioreq_vcpu_list,
list_entry )
@@ -127,13 +164,15 @@ bool handle_hvm_io_completion(struct vcpu *v)
struct hvm_vcpu_io *vio = &v->arch.hvm_vcpu.hvm_io;
struct hvm_ioreq_server *s;
enum hvm_io_completion io_completion;
+ unsigned int id;
- list_for_each_entry ( s,
- &d->arch.hvm_domain.ioreq_server.list,
- list_entry )
+ FOR_EACH_IOREQ_SERVER(d, id, s)
{
struct hvm_ioreq_vcpu *sv;
+ if ( !s )
+ continue;
+
list_for_each_entry ( sv,
&s->ioreq_vcpu_list,
list_entry )
@@ -243,14 +282,16 @@ static int hvm_map_ioreq_page(
bool is_ioreq_server_page(struct domain *d, const struct page_info *page)
{
const struct hvm_ioreq_server *s;
+ unsigned int id;
bool found = false;
spin_lock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
- list_for_each_entry ( s,
- &d->arch.hvm_domain.ioreq_server.list,
- list_entry )
+ FOR_EACH_IOREQ_SERVER(d, id, s)
{
+ if ( !s )
+ continue;
+
if ( (s->ioreq.va && s->ioreq.page == page) ||
(s->bufioreq.va && s->bufioreq.page == page) )
{
@@ -302,7 +343,7 @@ static void hvm_update_ioreq_evtchn(struct hvm_ioreq_server *s,
}
static int hvm_ioreq_server_add_vcpu(struct hvm_ioreq_server *s,
- bool is_default, struct vcpu *v)
+ struct vcpu *v)
{
struct hvm_ioreq_vcpu *sv;
int rc;
@@ -331,7 +372,7 @@ static int hvm_ioreq_server_add_vcpu(struct hvm_ioreq_server *s,
goto fail3;
s->bufioreq_evtchn = rc;
- if ( is_default )
+ if ( IS_DEFAULT(s) )
d->arch.hvm_domain.params[HVM_PARAM_BUFIOREQ_EVTCHN] =
s->bufioreq_evtchn;
}
@@ -431,7 +472,6 @@ static int hvm_ioreq_server_map_pages(struct hvm_ioreq_server *s,
}
static int hvm_ioreq_server_setup_pages(struct hvm_ioreq_server *s,
- bool is_default,
bool handle_bufioreq)
{
struct domain *d = s->domain;
@@ -439,7 +479,7 @@ static int hvm_ioreq_server_setup_pages(struct hvm_ioreq_server *s,
unsigned long bufioreq_gfn = gfn_x(INVALID_GFN);
int rc;
- if ( is_default )
+ if ( IS_DEFAULT(s) )
{
/*
* The default ioreq server must handle buffered ioreqs, for
@@ -468,8 +508,7 @@ static int hvm_ioreq_server_setup_pages(struct hvm_ioreq_server *s,
return rc;
}
-static void hvm_ioreq_server_unmap_pages(struct hvm_ioreq_server *s,
- bool is_default)
+static void hvm_ioreq_server_unmap_pages(struct hvm_ioreq_server *s)
{
struct domain *d = s->domain;
bool handle_bufioreq = !!s->bufioreq.va;
@@ -479,7 +518,7 @@ static void hvm_ioreq_server_unmap_pages(struct hvm_ioreq_server *s,
hvm_unmap_ioreq_page(s, false);
- if ( !is_default )
+ if ( !IS_DEFAULT(s) )
{
if ( handle_bufioreq )
hvm_free_ioreq_gfn(d, s->bufioreq.gfn);
@@ -488,12 +527,11 @@ static void hvm_ioreq_server_unmap_pages(struct hvm_ioreq_server *s,
}
}
-static void hvm_ioreq_server_free_rangesets(struct hvm_ioreq_server *s,
- bool is_default)
+static void hvm_ioreq_server_free_rangesets(struct hvm_ioreq_server *s)
{
unsigned int i;
- if ( is_default )
+ if ( IS_DEFAULT(s) )
return;
for ( i = 0; i < NR_IO_RANGE_TYPES; i++ )
@@ -501,19 +539,21 @@ static void hvm_ioreq_server_free_rangesets(struct hvm_ioreq_server *s,
}
static int hvm_ioreq_server_alloc_rangesets(struct hvm_ioreq_server *s,
- bool is_default)
+ ioservid_t id)
{
unsigned int i;
int rc;
- if ( is_default )
+ if ( id == DEFAULT_IOSERVID )
goto done;
+ ASSERT(!IS_DEFAULT(s));
+
for ( i = 0; i < NR_IO_RANGE_TYPES; i++ )
{
char *name;
- rc = asprintf(&name, "ioreq_server %d %s", s->id,
+ rc = asprintf(&name, "ioreq_server %d %s", id,
(i == XEN_DMOP_IO_RANGE_PORT) ? "port" :
(i == XEN_DMOP_IO_RANGE_MEMORY) ? "memory" :
(i == XEN_DMOP_IO_RANGE_PCI) ? "pci" :
@@ -537,13 +577,12 @@ static int hvm_ioreq_server_alloc_rangesets(struct hvm_ioreq_server *s,
return 0;
fail:
- hvm_ioreq_server_free_rangesets(s, false);
+ hvm_ioreq_server_free_rangesets(s);
return rc;
}
-static void hvm_ioreq_server_enable(struct hvm_ioreq_server *s,
- bool is_default)
+static void hvm_ioreq_server_enable(struct hvm_ioreq_server *s)
{
struct domain *d = s->domain;
struct hvm_ioreq_vcpu *sv;
@@ -554,7 +593,7 @@ static void hvm_ioreq_server_enable(struct hvm_ioreq_server *s,
if ( s->enabled )
goto done;
- if ( !is_default )
+ if ( !IS_DEFAULT(s) )
{
hvm_remove_ioreq_gfn(d, &s->ioreq);
@@ -573,8 +612,7 @@ static void hvm_ioreq_server_enable(struct hvm_ioreq_server *s,
spin_unlock(&s->lock);
}
-static void hvm_ioreq_server_disable(struct hvm_ioreq_server *s,
- bool is_default)
+static void hvm_ioreq_server_disable(struct hvm_ioreq_server *s)
{
struct domain *d = s->domain;
bool handle_bufioreq = !!s->bufioreq.va;
@@ -584,7 +622,7 @@ static void hvm_ioreq_server_disable(struct hvm_ioreq_server *s,
if ( !s->enabled )
goto done;
- if ( !is_default )
+ if ( !IS_DEFAULT(s) )
{
if ( handle_bufioreq )
hvm_add_ioreq_gfn(d, &s->bufioreq);
@@ -600,13 +638,11 @@ static void hvm_ioreq_server_disable(struct hvm_ioreq_server *s,
static int hvm_ioreq_server_init(struct hvm_ioreq_server *s,
struct domain *d, domid_t domid,
- bool is_default, int bufioreq_handling,
- ioservid_t id)
+ int bufioreq_handling, ioservid_t id)
{
struct vcpu *v;
int rc;
- s->id = id;
s->domain = d;
s->domid = domid;
@@ -614,7 +650,7 @@ static int hvm_ioreq_server_init(struct hvm_ioreq_server *s,
INIT_LIST_HEAD(&s->ioreq_vcpu_list);
spin_lock_init(&s->bufioreq_lock);
- rc = hvm_ioreq_server_alloc_rangesets(s, is_default);
+ rc = hvm_ioreq_server_alloc_rangesets(s, id);
if ( rc )
return rc;
@@ -622,13 +658,13 @@ static int hvm_ioreq_server_init(struct hvm_ioreq_server *s,
s->bufioreq_atomic = true;
rc = hvm_ioreq_server_setup_pages(
- s, is_default, bufioreq_handling != HVM_IOREQSRV_BUFIOREQ_OFF);
+ s, bufioreq_handling != HVM_IOREQSRV_BUFIOREQ_OFF);
if ( rc )
goto fail_map;
for_each_vcpu ( d, v )
{
- rc = hvm_ioreq_server_add_vcpu(s, is_default, v);
+ rc = hvm_ioreq_server_add_vcpu(s, v);
if ( rc )
goto fail_add;
}
@@ -637,47 +673,20 @@ static int hvm_ioreq_server_init(struct hvm_ioreq_server *s,
fail_add:
hvm_ioreq_server_remove_all_vcpus(s);
- hvm_ioreq_server_unmap_pages(s, is_default);
+ hvm_ioreq_server_unmap_pages(s);
fail_map:
- hvm_ioreq_server_free_rangesets(s, is_default);
+ hvm_ioreq_server_free_rangesets(s);
return rc;
}
-static void hvm_ioreq_server_deinit(struct hvm_ioreq_server *s,
- bool is_default)
+static void hvm_ioreq_server_deinit(struct hvm_ioreq_server *s)
{
ASSERT(!s->enabled);
hvm_ioreq_server_remove_all_vcpus(s);
- hvm_ioreq_server_unmap_pages(s, is_default);
- hvm_ioreq_server_free_rangesets(s, is_default);
-}
-
-static ioservid_t next_ioservid(struct domain *d)
-{
- struct hvm_ioreq_server *s;
- ioservid_t id;
-
- ASSERT(spin_is_locked(&d->arch.hvm_domain.ioreq_server.lock));
-
- id = d->arch.hvm_domain.ioreq_server.id;
-
- again:
- id++;
-
- /* Check for uniqueness */
- list_for_each_entry ( s,
- &d->arch.hvm_domain.ioreq_server.list,
- list_entry )
- {
- if ( id == s->id )
- goto again;
- }
-
- d->arch.hvm_domain.ioreq_server.id = id;
-
- return id;
+ hvm_ioreq_server_unmap_pages(s);
+ hvm_ioreq_server_free_rangesets(s);
}
int hvm_create_ioreq_server(struct domain *d, domid_t domid,
@@ -685,52 +694,64 @@ int hvm_create_ioreq_server(struct domain *d, domid_t domid,
ioservid_t *id)
{
struct hvm_ioreq_server *s;
+ unsigned int i;
int rc;
if ( bufioreq_handling > HVM_IOREQSRV_BUFIOREQ_ATOMIC )
return -EINVAL;
- rc = -ENOMEM;
s = xzalloc(struct hvm_ioreq_server);
if ( !s )
- goto fail1;
+ return -ENOMEM;
domain_pause(d);
spin_lock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
- rc = -EEXIST;
- if ( is_default && d->arch.hvm_domain.default_ioreq_server != NULL )
- goto fail2;
-
- rc = hvm_ioreq_server_init(s, d, domid, is_default, bufioreq_handling,
- next_ioservid(d));
- if ( rc )
- goto fail3;
-
- list_add(&s->list_entry,
- &d->arch.hvm_domain.ioreq_server.list);
-
if ( is_default )
{
- d->arch.hvm_domain.default_ioreq_server = s;
- hvm_ioreq_server_enable(s, true);
+ i = DEFAULT_IOSERVID;
+
+ rc = -EEXIST;
+ if ( GET_IOREQ_SERVER(d, i) )
+ goto fail;
}
+ else
+ {
+ for ( i = 0; i < MAX_NR_IOREQ_SERVERS; i++ )
+ {
+ if ( i != DEFAULT_IOSERVID && !GET_IOREQ_SERVER(d, i) )
+ break;
+ }
+
+ rc = -ENOSPC;
+ if ( i >= MAX_NR_IOREQ_SERVERS )
+ goto fail;
+ }
+
+ set_ioreq_server(d, i, s);
+
+ rc = hvm_ioreq_server_init(s, d, domid, bufioreq_handling, i);
+ if ( rc )
+ goto fail;
+
+ if ( i == DEFAULT_IOSERVID )
+ hvm_ioreq_server_enable(s);
if ( id )
- *id = s->id;
+ *id = i;
spin_unlock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
domain_unpause(d);
return 0;
- fail3:
- fail2:
+ fail:
+ set_ioreq_server(d, i, NULL);
+
spin_unlock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
domain_unpause(d);
xfree(s);
- fail1:
return rc;
}
@@ -739,37 +760,34 @@ int hvm_destroy_ioreq_server(struct domain *d, ioservid_t id)
struct hvm_ioreq_server *s;
int rc;
+ if ( id == DEFAULT_IOSERVID )
+ return -EPERM;
+
spin_lock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
- rc = -ENOENT;
- list_for_each_entry ( s,
- &d->arch.hvm_domain.ioreq_server.list,
- list_entry )
- {
- if ( s == d->arch.hvm_domain.default_ioreq_server )
- continue;
+ s = get_ioreq_server(d, id);
- if ( s->id != id )
- continue;
-
- domain_pause(d);
+ rc = -ENOENT;
+ if ( !s )
+ goto out;
- p2m_set_ioreq_server(d, 0, s);
+ ASSERT(!IS_DEFAULT(s));
- hvm_ioreq_server_disable(s, false);
+ domain_pause(d);
- list_del(&s->list_entry);
+ p2m_set_ioreq_server(d, 0, s);
- hvm_ioreq_server_deinit(s, false);
+ hvm_ioreq_server_disable(s);
+ hvm_ioreq_server_deinit(s);
- domain_unpause(d);
+ domain_unpause(d);
- xfree(s);
+ set_ioreq_server(d, id, NULL);
+ xfree(s);
- rc = 0;
- break;
- }
+ rc = 0;
+ out:
spin_unlock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
return rc;
@@ -783,31 +801,30 @@ int hvm_get_ioreq_server_info(struct domain *d, ioservid_t id,
struct hvm_ioreq_server *s;
int rc;
+ if ( id == DEFAULT_IOSERVID )
+ return -EOPNOTSUPP;
+
spin_lock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
- rc = -ENOENT;
- list_for_each_entry ( s,
- &d->arch.hvm_domain.ioreq_server.list,
- list_entry )
- {
- if ( s == d->arch.hvm_domain.default_ioreq_server )
- continue;
+ s = get_ioreq_server(d, id);
- if ( s->id != id )
- continue;
+ rc = -ENOENT;
+ if ( !s )
+ goto out;
- *ioreq_gfn = s->ioreq.gfn;
+ ASSERT(!IS_DEFAULT(s));
- if ( s->bufioreq.va != NULL )
- {
- *bufioreq_gfn = s->bufioreq.gfn;
- *bufioreq_port = s->bufioreq_evtchn;
- }
+ *ioreq_gfn = s->ioreq.gfn;
- rc = 0;
- break;
+ if ( s->bufioreq.va != NULL )
+ {
+ *bufioreq_gfn = s->bufioreq.gfn;
+ *bufioreq_port = s->bufioreq_evtchn;
}
+ rc = 0;
+
+ out:
spin_unlock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
return rc;
@@ -818,48 +835,46 @@ int hvm_map_io_range_to_ioreq_server(struct domain *d, ioservid_t id,
uint64_t end)
{
struct hvm_ioreq_server *s;
+ struct rangeset *r;
int rc;
+ if ( id == DEFAULT_IOSERVID )
+ return -EOPNOTSUPP;
+
spin_lock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
+ s = get_ioreq_server(d, id);
+
rc = -ENOENT;
- list_for_each_entry ( s,
- &d->arch.hvm_domain.ioreq_server.list,
- list_entry )
- {
- if ( s == d->arch.hvm_domain.default_ioreq_server )
- continue;
+ if ( !s )
+ goto out;
- if ( s->id == id )
- {
- struct rangeset *r;
+ ASSERT(!IS_DEFAULT(s));
- switch ( type )
- {
- case XEN_DMOP_IO_RANGE_PORT:
- case XEN_DMOP_IO_RANGE_MEMORY:
- case XEN_DMOP_IO_RANGE_PCI:
- r = s->range[type];
- break;
+ switch ( type )
+ {
+ case XEN_DMOP_IO_RANGE_PORT:
+ case XEN_DMOP_IO_RANGE_MEMORY:
+ case XEN_DMOP_IO_RANGE_PCI:
+ r = s->range[type];
+ break;
- default:
- r = NULL;
- break;
- }
+ default:
+ r = NULL;
+ break;
+ }
- rc = -EINVAL;
- if ( !r )
- break;
+ rc = -EINVAL;
+ if ( !r )
+ goto out;
- rc = -EEXIST;
- if ( rangeset_overlaps_range(r, start, end) )
- break;
+ rc = -EEXIST;
+ if ( rangeset_overlaps_range(r, start, end) )
+ goto out;
- rc = rangeset_add_range(r, start, end);
- break;
- }
- }
+ rc = rangeset_add_range(r, start, end);
+ out:
spin_unlock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
return rc;
@@ -870,48 +885,46 @@ int hvm_unmap_io_range_from_ioreq_server(struct domain *d, ioservid_t id,
uint64_t end)
{
struct hvm_ioreq_server *s;
+ struct rangeset *r;
int rc;
+ if ( id == DEFAULT_IOSERVID )
+ return -EOPNOTSUPP;
+
spin_lock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
+ s = get_ioreq_server(d, id);
+
rc = -ENOENT;
- list_for_each_entry ( s,
- &d->arch.hvm_domain.ioreq_server.list,
- list_entry )
- {
- if ( s == d->arch.hvm_domain.default_ioreq_server )
- continue;
+ if ( !s )
+ goto out;
- if ( s->id == id )
- {
- struct rangeset *r;
+ ASSERT(!IS_DEFAULT(s));
- switch ( type )
- {
- case XEN_DMOP_IO_RANGE_PORT:
- case XEN_DMOP_IO_RANGE_MEMORY:
- case XEN_DMOP_IO_RANGE_PCI:
- r = s->range[type];
- break;
+ switch ( type )
+ {
+ case XEN_DMOP_IO_RANGE_PORT:
+ case XEN_DMOP_IO_RANGE_MEMORY:
+ case XEN_DMOP_IO_RANGE_PCI:
+ r = s->range[type];
+ break;
- default:
- r = NULL;
- break;
- }
+ default:
+ r = NULL;
+ break;
+ }
- rc = -EINVAL;
- if ( !r )
- break;
+ rc = -EINVAL;
+ if ( !r )
+ goto out;
- rc = -ENOENT;
- if ( !rangeset_contains_range(r, start, end) )
- break;
+ rc = -ENOENT;
+ if ( !rangeset_contains_range(r, start, end) )
+ goto out;
- rc = rangeset_remove_range(r, start, end);
- break;
- }
- }
+ rc = rangeset_remove_range(r, start, end);
+ out:
spin_unlock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
return rc;
@@ -931,6 +944,9 @@ int hvm_map_mem_type_to_ioreq_server(struct domain *d, ioservid_t id,
struct hvm_ioreq_server *s;
int rc;
+ if ( id == DEFAULT_IOSERVID )
+ return -EOPNOTSUPP;
+
if ( type != HVMMEM_ioreq_server )
return -EINVAL;
@@ -939,19 +955,14 @@ int hvm_map_mem_type_to_ioreq_server(struct domain *d, ioservid_t id,
spin_lock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
- rc = -ENOENT;
- list_for_each_entry ( s,
- &d->arch.hvm_domain.ioreq_server.list,
- list_entry )
- {
- if ( s == d->arch.hvm_domain.default_ioreq_server )
- continue;
+ s = get_ioreq_server(d, id);
- if ( s->id == id )
- {
- rc = p2m_set_ioreq_server(d, flags, s);
- break;
- }
+ if ( !s )
+ rc = -ENOENT;
+ else
+ {
+ ASSERT(!IS_DEFAULT(s));
+ rc = p2m_set_ioreq_server(d, flags, s);
}
spin_unlock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
@@ -970,38 +981,34 @@ int hvm_map_mem_type_to_ioreq_server(struct domain *d, ioservid_t id,
int hvm_set_ioreq_server_state(struct domain *d, ioservid_t id,
bool enabled)
{
- struct list_head *entry;
+ struct hvm_ioreq_server *s;
int rc;
+ if ( id == DEFAULT_IOSERVID )
+ return -EOPNOTSUPP;
+
spin_lock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
+ s = get_ioreq_server(d, id);
+
rc = -ENOENT;
- list_for_each ( entry,
- &d->arch.hvm_domain.ioreq_server.list )
- {
- struct hvm_ioreq_server *s = list_entry(entry,
- struct hvm_ioreq_server,
- list_entry);
+ if ( !s )
+ goto out;
- if ( s == d->arch.hvm_domain.default_ioreq_server )
- continue;
+ ASSERT(!IS_DEFAULT(s));
- if ( s->id != id )
- continue;
-
- domain_pause(d);
+ domain_pause(d);
- if ( enabled )
- hvm_ioreq_server_enable(s, false);
- else
- hvm_ioreq_server_disable(s, false);
+ if ( enabled )
+ hvm_ioreq_server_enable(s);
+ else
+ hvm_ioreq_server_disable(s);
- domain_unpause(d);
+ domain_unpause(d);
- rc = 0;
- break;
- }
+ rc = 0;
+ out:
spin_unlock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
return rc;
}
@@ -1009,17 +1016,17 @@ int hvm_set_ioreq_server_state(struct domain *d, ioservid_t id,
int hvm_all_ioreq_servers_add_vcpu(struct domain *d, struct vcpu *v)
{
struct hvm_ioreq_server *s;
+ unsigned int id;
int rc;
spin_lock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
- list_for_each_entry ( s,
- &d->arch.hvm_domain.ioreq_server.list,
- list_entry )
+ FOR_EACH_IOREQ_SERVER(d, id, s)
{
- bool is_default = (s == d->arch.hvm_domain.default_ioreq_server);
+ if ( !s )
+ continue;
- rc = hvm_ioreq_server_add_vcpu(s, is_default, v);
+ rc = hvm_ioreq_server_add_vcpu(s, v);
if ( rc )
goto fail;
}
@@ -1029,10 +1036,15 @@ int hvm_all_ioreq_servers_add_vcpu(struct domain *d, struct vcpu *v)
return 0;
fail:
- list_for_each_entry ( s,
- &d->arch.hvm_domain.ioreq_server.list,
- list_entry )
+ while ( id-- != 0 )
+ {
+ s = GET_IOREQ_SERVER(d, id);
+
+ if ( !s )
+ continue;
+
hvm_ioreq_server_remove_vcpu(s, v);
+ }
spin_unlock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
@@ -1042,41 +1054,39 @@ int hvm_all_ioreq_servers_add_vcpu(struct domain *d, struct vcpu *v)
void hvm_all_ioreq_servers_remove_vcpu(struct domain *d, struct vcpu *v)
{
struct hvm_ioreq_server *s;
+ unsigned int id;
spin_lock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
- list_for_each_entry ( s,
- &d->arch.hvm_domain.ioreq_server.list,
- list_entry )
+ FOR_EACH_IOREQ_SERVER(d, id, s)
+ {
+ if ( !s )
+ continue;
+
hvm_ioreq_server_remove_vcpu(s, v);
+ }
spin_unlock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
}
void hvm_destroy_all_ioreq_servers(struct domain *d)
{
- struct hvm_ioreq_server *s, *next;
+ struct hvm_ioreq_server *s;
+ unsigned int id;
spin_lock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
/* No need to domain_pause() as the domain is being torn down */
- list_for_each_entry_safe ( s,
- next,
- &d->arch.hvm_domain.ioreq_server.list,
- list_entry )
+ FOR_EACH_IOREQ_SERVER(d, id, s)
{
- bool is_default = (s == d->arch.hvm_domain.default_ioreq_server);
-
- hvm_ioreq_server_disable(s, is_default);
-
- if ( is_default )
- d->arch.hvm_domain.default_ioreq_server = NULL;
-
- list_del(&s->list_entry);
+ if ( !s )
+ continue;
- hvm_ioreq_server_deinit(s, is_default);
+ hvm_ioreq_server_disable(s);
+ hvm_ioreq_server_deinit(s);
+ set_ioreq_server(d, id, NULL);
xfree(s);
}
@@ -1111,7 +1121,7 @@ int hvm_set_dm_domain(struct domain *d, domid_t domid)
* still be set and thus, when the server is created, it will have
* the correct domid.
*/
- s = d->arch.hvm_domain.default_ioreq_server;
+ s = GET_IOREQ_SERVER(d, DEFAULT_IOSERVID);
if ( !s )
goto done;
@@ -1164,12 +1174,10 @@ struct hvm_ioreq_server *hvm_select_ioreq_server(struct domain *d,
uint32_t cf8;
uint8_t type;
uint64_t addr;
-
- if ( list_empty(&d->arch.hvm_domain.ioreq_server.list) )
- return NULL;
+ unsigned int id;
if ( p->type != IOREQ_TYPE_COPY && p->type != IOREQ_TYPE_PIO )
- return d->arch.hvm_domain.default_ioreq_server;
+ return GET_IOREQ_SERVER(d, DEFAULT_IOSERVID);
cf8 = d->arch.hvm_domain.pci_cf8;
@@ -1209,16 +1217,11 @@ struct hvm_ioreq_server *hvm_select_ioreq_server(struct domain *d,
addr = p->addr;
}
- list_for_each_entry ( s,
- &d->arch.hvm_domain.ioreq_server.list,
- list_entry )
+ FOR_EACH_IOREQ_SERVER(d, id, s)
{
struct rangeset *r;
- if ( s == d->arch.hvm_domain.default_ioreq_server )
- continue;
-
- if ( !s->enabled )
+ if ( !s || IS_DEFAULT(s) )
continue;
r = s->range[type];
@@ -1251,7 +1254,7 @@ struct hvm_ioreq_server *hvm_select_ioreq_server(struct domain *d,
}
}
- return d->arch.hvm_domain.default_ioreq_server;
+ return GET_IOREQ_SERVER(d, DEFAULT_IOSERVID);
}
static int hvm_send_buffered_ioreq(struct hvm_ioreq_server *s, ioreq_t *p)
@@ -1410,13 +1413,16 @@ unsigned int hvm_broadcast_ioreq(ioreq_t *p, bool buffered)
{
struct domain *d = current->domain;
struct hvm_ioreq_server *s;
- unsigned int failed = 0;
+ unsigned int id, failed = 0;
+
+ FOR_EACH_IOREQ_SERVER(d, id, s)
+ {
+ if ( !s )
+ continue;
- list_for_each_entry ( s,
- &d->arch.hvm_domain.ioreq_server.list,
- list_entry )
if ( hvm_send_ioreq(s, p, buffered) == X86EMUL_UNHANDLEABLE )
failed++;
+ }
return failed;
}
@@ -1436,7 +1442,6 @@ static int hvm_access_cf8(
void hvm_ioreq_init(struct domain *d)
{
spin_lock_init(&d->arch.hvm_domain.ioreq_server.lock);
- INIT_LIST_HEAD(&d->arch.hvm_domain.ioreq_server.list);
register_portio_handler(d, 0xcf8, 4, hvm_access_cf8);
}
diff --git a/xen/include/asm-x86/hvm/domain.h b/xen/include/asm-x86/hvm/domain.h
index 7f128c05ff..e17bbe4004 100644
--- a/xen/include/asm-x86/hvm/domain.h
+++ b/xen/include/asm-x86/hvm/domain.h
@@ -60,7 +60,6 @@ struct hvm_ioreq_server {
/* Domain id of emulating domain */
domid_t domid;
- ioservid_t id;
struct hvm_ioreq_page ioreq;
struct list_head ioreq_vcpu_list;
struct hvm_ioreq_page bufioreq;
@@ -100,6 +99,9 @@ struct hvm_pi_ops {
void (*do_resume)(struct vcpu *v);
};
+#define MAX_NR_IOREQ_SERVERS 8
+#define DEFAULT_IOSERVID 0
+
struct hvm_domain {
/* Guest page range used for non-default ioreq servers */
struct {
@@ -109,11 +111,9 @@ struct hvm_domain {
/* Lock protects all other values in the sub-struct and the default */
struct {
- spinlock_t lock;
- ioservid_t id;
- struct list_head list;
+ spinlock_t lock;
+ struct hvm_ioreq_server *server[MAX_NR_IOREQ_SERVERS];
} ioreq_server;
- struct hvm_ioreq_server *default_ioreq_server;
/* Cached CF8 for guest PCI config cycles */
uint32_t pci_cf8;
--
2.11.0
_______________________________________________
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Xen-devel@lists.xen.org
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^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v8 02/11] x86/hvm/ioreq: simplify code and use consistent naming
2017-09-29 14:51 [PATCH v8 00/11] x86: guest resource mapping Paul Durrant
2017-09-29 14:51 ` [PATCH v8 01/11] x86/hvm/ioreq: maintain an array of ioreq servers rather than a list Paul Durrant
@ 2017-09-29 14:51 ` Paul Durrant
2017-09-29 14:51 ` [PATCH v8 03/11] x86/hvm/ioreq: use gfn_t in struct hvm_ioreq_page Paul Durrant
` (8 subsequent siblings)
10 siblings, 0 replies; 17+ messages in thread
From: Paul Durrant @ 2017-09-29 14:51 UTC (permalink / raw)
To: xen-devel; +Cc: Andrew Cooper, Paul Durrant
This patch re-works much of the ioreq server initialization and teardown
code:
- The hvm_map/unmap_ioreq_gfn() functions are expanded to call through
to hvm_alloc/free_ioreq_gfn() rather than expecting them to be called
separately by outer functions.
- Several functions now test the validity of the hvm_ioreq_page gfn value
to determine whether they need to act. This means can be safely called
for the bufioreq page even when it is not used.
- hvm_add/remove_ioreq_gfn() simply return in the case of the default
IOREQ server so callers no longer need to test before calling.
- hvm_ioreq_server_setup_pages() is renamed to hvm_ioreq_server_map_pages()
to mirror the existing hvm_ioreq_server_unmap_pages().
All of this significantly shortens the code.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
---
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
v3:
- Rebased on top of 's->is_default' to 'IS_DEFAULT(s)' changes.
- Minor updates in response to review comments from Roger.
---
xen/arch/x86/hvm/ioreq.c | 182 ++++++++++++++++++-----------------------------
1 file changed, 69 insertions(+), 113 deletions(-)
diff --git a/xen/arch/x86/hvm/ioreq.c b/xen/arch/x86/hvm/ioreq.c
index e655d2eab3..6ac4ba20ff 100644
--- a/xen/arch/x86/hvm/ioreq.c
+++ b/xen/arch/x86/hvm/ioreq.c
@@ -220,63 +220,75 @@ bool handle_hvm_io_completion(struct vcpu *v)
return true;
}
-static int hvm_alloc_ioreq_gfn(struct domain *d, unsigned long *gfn)
+static unsigned long hvm_alloc_ioreq_gfn(struct hvm_ioreq_server *s)
{
+ struct domain *d = s->domain;
unsigned int i;
- int rc;
- rc = -ENOMEM;
+ ASSERT(!IS_DEFAULT(s));
+
for ( i = 0; i < sizeof(d->arch.hvm_domain.ioreq_gfn.mask) * 8; i++ )
{
if ( test_and_clear_bit(i, &d->arch.hvm_domain.ioreq_gfn.mask) )
- {
- *gfn = d->arch.hvm_domain.ioreq_gfn.base + i;
- rc = 0;
- break;
- }
+ return d->arch.hvm_domain.ioreq_gfn.base + i;
}
- return rc;
+ return gfn_x(INVALID_GFN);
}
-static void hvm_free_ioreq_gfn(struct domain *d, unsigned long gfn)
+static void hvm_free_ioreq_gfn(struct hvm_ioreq_server *s,
+ unsigned long gfn)
{
+ struct domain *d = s->domain;
unsigned int i = gfn - d->arch.hvm_domain.ioreq_gfn.base;
- if ( gfn != gfn_x(INVALID_GFN) )
- set_bit(i, &d->arch.hvm_domain.ioreq_gfn.mask);
+ ASSERT(!IS_DEFAULT(s));
+ ASSERT(gfn != gfn_x(INVALID_GFN));
+
+ set_bit(i, &d->arch.hvm_domain.ioreq_gfn.mask);
}
-static void hvm_unmap_ioreq_page(struct hvm_ioreq_server *s, bool buf)
+static void hvm_unmap_ioreq_gfn(struct hvm_ioreq_server *s, bool buf)
{
struct hvm_ioreq_page *iorp = buf ? &s->bufioreq : &s->ioreq;
+ if ( iorp->gfn == gfn_x(INVALID_GFN) )
+ return;
+
destroy_ring_for_helper(&iorp->va, iorp->page);
+ iorp->page = NULL;
+
+ if ( !IS_DEFAULT(s) )
+ hvm_free_ioreq_gfn(s, iorp->gfn);
+
+ iorp->gfn = gfn_x(INVALID_GFN);
}
-static int hvm_map_ioreq_page(
- struct hvm_ioreq_server *s, bool buf, unsigned long gfn)
+static int hvm_map_ioreq_gfn(struct hvm_ioreq_server *s, bool buf)
{
struct domain *d = s->domain;
struct hvm_ioreq_page *iorp = buf ? &s->bufioreq : &s->ioreq;
- struct page_info *page;
- void *va;
int rc;
- if ( (rc = prepare_ring_for_helper(d, gfn, &page, &va)) )
- return rc;
-
- if ( (iorp->va != NULL) || d->is_dying )
- {
- destroy_ring_for_helper(&va, page);
+ if ( d->is_dying )
return -EINVAL;
- }
- iorp->va = va;
- iorp->page = page;
- iorp->gfn = gfn;
+ if ( IS_DEFAULT(s) )
+ iorp->gfn = buf ?
+ d->arch.hvm_domain.params[HVM_PARAM_BUFIOREQ_PFN] :
+ d->arch.hvm_domain.params[HVM_PARAM_IOREQ_PFN];
+ else
+ iorp->gfn = hvm_alloc_ioreq_gfn(s);
- return 0;
+ if ( iorp->gfn == gfn_x(INVALID_GFN) )
+ return -ENOMEM;
+
+ rc = prepare_ring_for_helper(d, iorp->gfn, &iorp->page, &iorp->va);
+
+ if ( rc )
+ hvm_unmap_ioreq_gfn(s, buf);
+
+ return rc;
}
bool is_ioreq_server_page(struct domain *d, const struct page_info *page)
@@ -292,8 +304,7 @@ bool is_ioreq_server_page(struct domain *d, const struct page_info *page)
if ( !s )
continue;
- if ( (s->ioreq.va && s->ioreq.page == page) ||
- (s->bufioreq.va && s->bufioreq.page == page) )
+ if ( (s->ioreq.page == page) || (s->bufioreq.page == page) )
{
found = true;
break;
@@ -305,20 +316,30 @@ bool is_ioreq_server_page(struct domain *d, const struct page_info *page)
return found;
}
-static void hvm_remove_ioreq_gfn(
- struct domain *d, struct hvm_ioreq_page *iorp)
+static void hvm_remove_ioreq_gfn(struct hvm_ioreq_server *s, bool buf)
+
{
+ struct domain *d = s->domain;
+ struct hvm_ioreq_page *iorp = buf ? &s->bufioreq : &s->ioreq;
+
+ if ( IS_DEFAULT(s) || iorp->gfn == gfn_x(INVALID_GFN) )
+ return;
+
if ( guest_physmap_remove_page(d, _gfn(iorp->gfn),
_mfn(page_to_mfn(iorp->page)), 0) )
domain_crash(d);
clear_page(iorp->va);
}
-static int hvm_add_ioreq_gfn(
- struct domain *d, struct hvm_ioreq_page *iorp)
+static int hvm_add_ioreq_gfn(struct hvm_ioreq_server *s, bool buf)
{
+ struct domain *d = s->domain;
+ struct hvm_ioreq_page *iorp = buf ? &s->bufioreq : &s->ioreq;
int rc;
+ if ( IS_DEFAULT(s) || iorp->gfn == gfn_x(INVALID_GFN) )
+ return 0;
+
clear_page(iorp->va);
rc = guest_physmap_add_page(d, _gfn(iorp->gfn),
@@ -453,78 +474,25 @@ static void hvm_ioreq_server_remove_all_vcpus(struct hvm_ioreq_server *s)
}
static int hvm_ioreq_server_map_pages(struct hvm_ioreq_server *s,
- unsigned long ioreq_gfn,
- unsigned long bufioreq_gfn)
+ bool handle_bufioreq)
{
int rc;
- rc = hvm_map_ioreq_page(s, false, ioreq_gfn);
- if ( rc )
- return rc;
-
- if ( bufioreq_gfn != gfn_x(INVALID_GFN) )
- rc = hvm_map_ioreq_page(s, true, bufioreq_gfn);
-
- if ( rc )
- hvm_unmap_ioreq_page(s, false);
-
- return rc;
-}
-
-static int hvm_ioreq_server_setup_pages(struct hvm_ioreq_server *s,
- bool handle_bufioreq)
-{
- struct domain *d = s->domain;
- unsigned long ioreq_gfn = gfn_x(INVALID_GFN);
- unsigned long bufioreq_gfn = gfn_x(INVALID_GFN);
- int rc;
-
- if ( IS_DEFAULT(s) )
- {
- /*
- * The default ioreq server must handle buffered ioreqs, for
- * backwards compatibility.
- */
- ASSERT(handle_bufioreq);
- return hvm_ioreq_server_map_pages(s,
- d->arch.hvm_domain.params[HVM_PARAM_IOREQ_PFN],
- d->arch.hvm_domain.params[HVM_PARAM_BUFIOREQ_PFN]);
- }
-
- rc = hvm_alloc_ioreq_gfn(d, &ioreq_gfn);
+ rc = hvm_map_ioreq_gfn(s, false);
if ( !rc && handle_bufioreq )
- rc = hvm_alloc_ioreq_gfn(d, &bufioreq_gfn);
-
- if ( !rc )
- rc = hvm_ioreq_server_map_pages(s, ioreq_gfn, bufioreq_gfn);
+ rc = hvm_map_ioreq_gfn(s, true);
if ( rc )
- {
- hvm_free_ioreq_gfn(d, ioreq_gfn);
- hvm_free_ioreq_gfn(d, bufioreq_gfn);
- }
+ hvm_unmap_ioreq_gfn(s, false);
return rc;
}
static void hvm_ioreq_server_unmap_pages(struct hvm_ioreq_server *s)
{
- struct domain *d = s->domain;
- bool handle_bufioreq = !!s->bufioreq.va;
-
- if ( handle_bufioreq )
- hvm_unmap_ioreq_page(s, true);
-
- hvm_unmap_ioreq_page(s, false);
-
- if ( !IS_DEFAULT(s) )
- {
- if ( handle_bufioreq )
- hvm_free_ioreq_gfn(d, s->bufioreq.gfn);
-
- hvm_free_ioreq_gfn(d, s->ioreq.gfn);
- }
+ hvm_unmap_ioreq_gfn(s, true);
+ hvm_unmap_ioreq_gfn(s, false);
}
static void hvm_ioreq_server_free_rangesets(struct hvm_ioreq_server *s)
@@ -584,22 +552,15 @@ static int hvm_ioreq_server_alloc_rangesets(struct hvm_ioreq_server *s,
static void hvm_ioreq_server_enable(struct hvm_ioreq_server *s)
{
- struct domain *d = s->domain;
struct hvm_ioreq_vcpu *sv;
- bool handle_bufioreq = !!s->bufioreq.va;
spin_lock(&s->lock);
if ( s->enabled )
goto done;
- if ( !IS_DEFAULT(s) )
- {
- hvm_remove_ioreq_gfn(d, &s->ioreq);
-
- if ( handle_bufioreq )
- hvm_remove_ioreq_gfn(d, &s->bufioreq);
- }
+ hvm_remove_ioreq_gfn(s, false);
+ hvm_remove_ioreq_gfn(s, true);
s->enabled = true;
@@ -614,21 +575,13 @@ static void hvm_ioreq_server_enable(struct hvm_ioreq_server *s)
static void hvm_ioreq_server_disable(struct hvm_ioreq_server *s)
{
- struct domain *d = s->domain;
- bool handle_bufioreq = !!s->bufioreq.va;
-
spin_lock(&s->lock);
if ( !s->enabled )
goto done;
- if ( !IS_DEFAULT(s) )
- {
- if ( handle_bufioreq )
- hvm_add_ioreq_gfn(d, &s->bufioreq);
-
- hvm_add_ioreq_gfn(d, &s->ioreq);
- }
+ hvm_add_ioreq_gfn(s, true);
+ hvm_add_ioreq_gfn(s, false);
s->enabled = false;
@@ -650,6 +603,9 @@ static int hvm_ioreq_server_init(struct hvm_ioreq_server *s,
INIT_LIST_HEAD(&s->ioreq_vcpu_list);
spin_lock_init(&s->bufioreq_lock);
+ s->ioreq.gfn = gfn_x(INVALID_GFN);
+ s->bufioreq.gfn = gfn_x(INVALID_GFN);
+
rc = hvm_ioreq_server_alloc_rangesets(s, id);
if ( rc )
return rc;
@@ -657,7 +613,7 @@ static int hvm_ioreq_server_init(struct hvm_ioreq_server *s,
if ( bufioreq_handling == HVM_IOREQSRV_BUFIOREQ_ATOMIC )
s->bufioreq_atomic = true;
- rc = hvm_ioreq_server_setup_pages(
+ rc = hvm_ioreq_server_map_pages(
s, bufioreq_handling != HVM_IOREQSRV_BUFIOREQ_OFF);
if ( rc )
goto fail_map;
--
2.11.0
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v8 03/11] x86/hvm/ioreq: use gfn_t in struct hvm_ioreq_page
2017-09-29 14:51 [PATCH v8 00/11] x86: guest resource mapping Paul Durrant
2017-09-29 14:51 ` [PATCH v8 01/11] x86/hvm/ioreq: maintain an array of ioreq servers rather than a list Paul Durrant
2017-09-29 14:51 ` [PATCH v8 02/11] x86/hvm/ioreq: simplify code and use consistent naming Paul Durrant
@ 2017-09-29 14:51 ` Paul Durrant
2017-09-29 14:51 ` [PATCH v8 04/11] x86/hvm/ioreq: defer mapping gfns until they are actually requsted Paul Durrant
` (7 subsequent siblings)
10 siblings, 0 replies; 17+ messages in thread
From: Paul Durrant @ 2017-09-29 14:51 UTC (permalink / raw)
To: xen-devel; +Cc: Andrew Cooper, Paul Durrant
This patch adjusts the ioreq server code to use type-safe gfn_t values
where possible. No functional change.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
---
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
---
xen/arch/x86/hvm/ioreq.c | 44 ++++++++++++++++++++--------------------
xen/include/asm-x86/hvm/domain.h | 2 +-
2 files changed, 23 insertions(+), 23 deletions(-)
diff --git a/xen/arch/x86/hvm/ioreq.c b/xen/arch/x86/hvm/ioreq.c
index 6ac4ba20ff..43b757b5b7 100644
--- a/xen/arch/x86/hvm/ioreq.c
+++ b/xen/arch/x86/hvm/ioreq.c
@@ -220,7 +220,7 @@ bool handle_hvm_io_completion(struct vcpu *v)
return true;
}
-static unsigned long hvm_alloc_ioreq_gfn(struct hvm_ioreq_server *s)
+static gfn_t hvm_alloc_ioreq_gfn(struct hvm_ioreq_server *s)
{
struct domain *d = s->domain;
unsigned int i;
@@ -230,20 +230,19 @@ static unsigned long hvm_alloc_ioreq_gfn(struct hvm_ioreq_server *s)
for ( i = 0; i < sizeof(d->arch.hvm_domain.ioreq_gfn.mask) * 8; i++ )
{
if ( test_and_clear_bit(i, &d->arch.hvm_domain.ioreq_gfn.mask) )
- return d->arch.hvm_domain.ioreq_gfn.base + i;
+ return _gfn(d->arch.hvm_domain.ioreq_gfn.base + i);
}
- return gfn_x(INVALID_GFN);
+ return INVALID_GFN;
}
-static void hvm_free_ioreq_gfn(struct hvm_ioreq_server *s,
- unsigned long gfn)
+static void hvm_free_ioreq_gfn(struct hvm_ioreq_server *s, gfn_t gfn)
{
struct domain *d = s->domain;
- unsigned int i = gfn - d->arch.hvm_domain.ioreq_gfn.base;
+ unsigned int i = gfn_x(gfn) - d->arch.hvm_domain.ioreq_gfn.base;
ASSERT(!IS_DEFAULT(s));
- ASSERT(gfn != gfn_x(INVALID_GFN));
+ ASSERT(!gfn_eq(gfn, INVALID_GFN));
set_bit(i, &d->arch.hvm_domain.ioreq_gfn.mask);
}
@@ -252,7 +251,7 @@ static void hvm_unmap_ioreq_gfn(struct hvm_ioreq_server *s, bool buf)
{
struct hvm_ioreq_page *iorp = buf ? &s->bufioreq : &s->ioreq;
- if ( iorp->gfn == gfn_x(INVALID_GFN) )
+ if ( gfn_eq(iorp->gfn, INVALID_GFN) )
return;
destroy_ring_for_helper(&iorp->va, iorp->page);
@@ -261,7 +260,7 @@ static void hvm_unmap_ioreq_gfn(struct hvm_ioreq_server *s, bool buf)
if ( !IS_DEFAULT(s) )
hvm_free_ioreq_gfn(s, iorp->gfn);
- iorp->gfn = gfn_x(INVALID_GFN);
+ iorp->gfn = INVALID_GFN;
}
static int hvm_map_ioreq_gfn(struct hvm_ioreq_server *s, bool buf)
@@ -274,16 +273,17 @@ static int hvm_map_ioreq_gfn(struct hvm_ioreq_server *s, bool buf)
return -EINVAL;
if ( IS_DEFAULT(s) )
- iorp->gfn = buf ?
- d->arch.hvm_domain.params[HVM_PARAM_BUFIOREQ_PFN] :
- d->arch.hvm_domain.params[HVM_PARAM_IOREQ_PFN];
+ iorp->gfn = _gfn(buf ?
+ d->arch.hvm_domain.params[HVM_PARAM_BUFIOREQ_PFN] :
+ d->arch.hvm_domain.params[HVM_PARAM_IOREQ_PFN]);
else
iorp->gfn = hvm_alloc_ioreq_gfn(s);
- if ( iorp->gfn == gfn_x(INVALID_GFN) )
+ if ( gfn_eq(iorp->gfn, INVALID_GFN) )
return -ENOMEM;
- rc = prepare_ring_for_helper(d, iorp->gfn, &iorp->page, &iorp->va);
+ rc = prepare_ring_for_helper(d, gfn_x(iorp->gfn), &iorp->page,
+ &iorp->va);
if ( rc )
hvm_unmap_ioreq_gfn(s, buf);
@@ -322,10 +322,10 @@ static void hvm_remove_ioreq_gfn(struct hvm_ioreq_server *s, bool buf)
struct domain *d = s->domain;
struct hvm_ioreq_page *iorp = buf ? &s->bufioreq : &s->ioreq;
- if ( IS_DEFAULT(s) || iorp->gfn == gfn_x(INVALID_GFN) )
+ if ( IS_DEFAULT(s) || gfn_eq(iorp->gfn, INVALID_GFN) )
return;
- if ( guest_physmap_remove_page(d, _gfn(iorp->gfn),
+ if ( guest_physmap_remove_page(d, iorp->gfn,
_mfn(page_to_mfn(iorp->page)), 0) )
domain_crash(d);
clear_page(iorp->va);
@@ -337,12 +337,12 @@ static int hvm_add_ioreq_gfn(struct hvm_ioreq_server *s, bool buf)
struct hvm_ioreq_page *iorp = buf ? &s->bufioreq : &s->ioreq;
int rc;
- if ( IS_DEFAULT(s) || iorp->gfn == gfn_x(INVALID_GFN) )
+ if ( IS_DEFAULT(s) || gfn_eq(iorp->gfn, INVALID_GFN) )
return 0;
clear_page(iorp->va);
- rc = guest_physmap_add_page(d, _gfn(iorp->gfn),
+ rc = guest_physmap_add_page(d, iorp->gfn,
_mfn(page_to_mfn(iorp->page)), 0);
if ( rc == 0 )
paging_mark_dirty(d, _mfn(page_to_mfn(iorp->page)));
@@ -603,8 +603,8 @@ static int hvm_ioreq_server_init(struct hvm_ioreq_server *s,
INIT_LIST_HEAD(&s->ioreq_vcpu_list);
spin_lock_init(&s->bufioreq_lock);
- s->ioreq.gfn = gfn_x(INVALID_GFN);
- s->bufioreq.gfn = gfn_x(INVALID_GFN);
+ s->ioreq.gfn = INVALID_GFN;
+ s->bufioreq.gfn = INVALID_GFN;
rc = hvm_ioreq_server_alloc_rangesets(s, id);
if ( rc )
@@ -770,11 +770,11 @@ int hvm_get_ioreq_server_info(struct domain *d, ioservid_t id,
ASSERT(!IS_DEFAULT(s));
- *ioreq_gfn = s->ioreq.gfn;
+ *ioreq_gfn = gfn_x(s->ioreq.gfn);
if ( s->bufioreq.va != NULL )
{
- *bufioreq_gfn = s->bufioreq.gfn;
+ *bufioreq_gfn = gfn_x(s->bufioreq.gfn);
*bufioreq_port = s->bufioreq_evtchn;
}
diff --git a/xen/include/asm-x86/hvm/domain.h b/xen/include/asm-x86/hvm/domain.h
index e17bbe4004..3bd9c5d7c0 100644
--- a/xen/include/asm-x86/hvm/domain.h
+++ b/xen/include/asm-x86/hvm/domain.h
@@ -36,7 +36,7 @@
#include <public/hvm/dm_op.h>
struct hvm_ioreq_page {
- unsigned long gfn;
+ gfn_t gfn;
struct page_info *page;
void *va;
};
--
2.11.0
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v8 04/11] x86/hvm/ioreq: defer mapping gfns until they are actually requsted
2017-09-29 14:51 [PATCH v8 00/11] x86: guest resource mapping Paul Durrant
` (2 preceding siblings ...)
2017-09-29 14:51 ` [PATCH v8 03/11] x86/hvm/ioreq: use gfn_t in struct hvm_ioreq_page Paul Durrant
@ 2017-09-29 14:51 ` Paul Durrant
2017-09-29 14:51 ` [PATCH v8 05/11] x86/mm: add HYPERVISOR_memory_op to acquire guest resources Paul Durrant
` (6 subsequent siblings)
10 siblings, 0 replies; 17+ messages in thread
From: Paul Durrant @ 2017-09-29 14:51 UTC (permalink / raw)
To: xen-devel
Cc: Stefano Stabellini, George Dunlap, Andrew Cooper, Ian Jackson,
Tim Deegan, Paul Durrant, Jan Beulich
A subsequent patch will introduce a new scheme to allow an emulator to
map ioreq server pages directly from Xen rather than the guest P2M.
This patch lays the groundwork for that change by deferring mapping of
gfns until their values are requested by an emulator. To that end, the
pad field of the xen_dm_op_get_ioreq_server_info structure is re-purposed
to a flags field and new flag, XEN_DMOP_no_gfns, defined which modifies the
behaviour of XEN_DMOP_get_ioreq_server_info to allow the caller to avoid
requesting the gfn values.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: George Dunlap <George.Dunlap@eu.citrix.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Tim Deegan <tim@xen.org>
v8:
- For safety make all of the pointers passed to
hvm_get_ioreq_server_info() optional.
- Shrink bufioreq_handling down to a uint8_t.
v3:
- Updated in response to review comments from Wei and Roger.
- Added a HANDLE_BUFIOREQ macro to make the code neater.
- This patch no longer introduces a security vulnerability since there
is now an explicit limit on the number of ioreq servers that may be
created for any one domain.
---
tools/libs/devicemodel/core.c | 8 +++++
tools/libs/devicemodel/include/xendevicemodel.h | 6 ++--
xen/arch/x86/hvm/dm.c | 9 +++--
xen/arch/x86/hvm/ioreq.c | 47 ++++++++++++++-----------
xen/include/asm-x86/hvm/domain.h | 2 +-
xen/include/public/hvm/dm_op.h | 32 ++++++++++-------
6 files changed, 63 insertions(+), 41 deletions(-)
diff --git a/tools/libs/devicemodel/core.c b/tools/libs/devicemodel/core.c
index 0f2c1a791f..91c69d103b 100644
--- a/tools/libs/devicemodel/core.c
+++ b/tools/libs/devicemodel/core.c
@@ -188,6 +188,14 @@ int xendevicemodel_get_ioreq_server_info(
data->id = id;
+ /*
+ * If the caller is not requesting gfn values then instruct the
+ * hypercall not to retrieve them as this may cause them to be
+ * mapped.
+ */
+ if (!ioreq_gfn && !bufioreq_gfn)
+ data->flags |= XEN_DMOP_no_gfns;
+
rc = xendevicemodel_op(dmod, domid, 1, &op, sizeof(op));
if (rc)
return rc;
diff --git a/tools/libs/devicemodel/include/xendevicemodel.h b/tools/libs/devicemodel/include/xendevicemodel.h
index 13216db04a..d73a76da35 100644
--- a/tools/libs/devicemodel/include/xendevicemodel.h
+++ b/tools/libs/devicemodel/include/xendevicemodel.h
@@ -61,11 +61,11 @@ int xendevicemodel_create_ioreq_server(
* @parm domid the domain id to be serviced
* @parm id the IOREQ Server id.
* @parm ioreq_gfn pointer to a xen_pfn_t to receive the synchronous ioreq
- * gfn
+ * gfn. (May be NULL if not required)
* @parm bufioreq_gfn pointer to a xen_pfn_t to receive the buffered ioreq
- * gfn
+ * gfn. (May be NULL if not required)
* @parm bufioreq_port pointer to a evtchn_port_t to receive the buffered
- * ioreq event channel
+ * ioreq event channel. (May be NULL if not required)
* @return 0 on success, -1 on failure.
*/
int xendevicemodel_get_ioreq_server_info(
diff --git a/xen/arch/x86/hvm/dm.c b/xen/arch/x86/hvm/dm.c
index 9cf53b551c..22fa5b51e3 100644
--- a/xen/arch/x86/hvm/dm.c
+++ b/xen/arch/x86/hvm/dm.c
@@ -416,16 +416,19 @@ static int dm_op(const struct dmop_args *op_args)
{
struct xen_dm_op_get_ioreq_server_info *data =
&op.u.get_ioreq_server_info;
+ const uint16_t valid_flags = XEN_DMOP_no_gfns;
const_op = false;
rc = -EINVAL;
- if ( data->pad )
+ if ( data->flags & ~valid_flags )
break;
rc = hvm_get_ioreq_server_info(d, data->id,
- &data->ioreq_gfn,
- &data->bufioreq_gfn,
+ (data->flags & XEN_DMOP_no_gfns) ?
+ NULL : &data->ioreq_gfn,
+ (data->flags & XEN_DMOP_no_gfns) ?
+ NULL : &data->bufioreq_gfn,
&data->bufioreq_port);
break;
}
diff --git a/xen/arch/x86/hvm/ioreq.c b/xen/arch/x86/hvm/ioreq.c
index 43b757b5b7..d68d7d0c1f 100644
--- a/xen/arch/x86/hvm/ioreq.c
+++ b/xen/arch/x86/hvm/ioreq.c
@@ -363,6 +363,9 @@ static void hvm_update_ioreq_evtchn(struct hvm_ioreq_server *s,
}
}
+#define HANDLE_BUFIOREQ(s) \
+ (s->bufioreq_handling != HVM_IOREQSRV_BUFIOREQ_OFF)
+
static int hvm_ioreq_server_add_vcpu(struct hvm_ioreq_server *s,
struct vcpu *v)
{
@@ -384,7 +387,7 @@ static int hvm_ioreq_server_add_vcpu(struct hvm_ioreq_server *s,
sv->ioreq_evtchn = rc;
- if ( v->vcpu_id == 0 && s->bufioreq.va != NULL )
+ if ( v->vcpu_id == 0 && HANDLE_BUFIOREQ(s) )
{
struct domain *d = s->domain;
@@ -435,7 +438,7 @@ static void hvm_ioreq_server_remove_vcpu(struct hvm_ioreq_server *s,
list_del(&sv->list_entry);
- if ( v->vcpu_id == 0 && s->bufioreq.va != NULL )
+ if ( v->vcpu_id == 0 && HANDLE_BUFIOREQ(s) )
free_xen_event_channel(v->domain, s->bufioreq_evtchn);
free_xen_event_channel(v->domain, sv->ioreq_evtchn);
@@ -462,7 +465,7 @@ static void hvm_ioreq_server_remove_all_vcpus(struct hvm_ioreq_server *s)
list_del(&sv->list_entry);
- if ( v->vcpu_id == 0 && s->bufioreq.va != NULL )
+ if ( v->vcpu_id == 0 && HANDLE_BUFIOREQ(s) )
free_xen_event_channel(v->domain, s->bufioreq_evtchn);
free_xen_event_channel(v->domain, sv->ioreq_evtchn);
@@ -473,14 +476,13 @@ static void hvm_ioreq_server_remove_all_vcpus(struct hvm_ioreq_server *s)
spin_unlock(&s->lock);
}
-static int hvm_ioreq_server_map_pages(struct hvm_ioreq_server *s,
- bool handle_bufioreq)
+static int hvm_ioreq_server_map_pages(struct hvm_ioreq_server *s)
{
int rc;
rc = hvm_map_ioreq_gfn(s, false);
- if ( !rc && handle_bufioreq )
+ if ( !rc && HANDLE_BUFIOREQ(s) )
rc = hvm_map_ioreq_gfn(s, true);
if ( rc )
@@ -610,13 +612,7 @@ static int hvm_ioreq_server_init(struct hvm_ioreq_server *s,
if ( rc )
return rc;
- if ( bufioreq_handling == HVM_IOREQSRV_BUFIOREQ_ATOMIC )
- s->bufioreq_atomic = true;
-
- rc = hvm_ioreq_server_map_pages(
- s, bufioreq_handling != HVM_IOREQSRV_BUFIOREQ_OFF);
- if ( rc )
- goto fail_map;
+ s->bufioreq_handling = bufioreq_handling;
for_each_vcpu ( d, v )
{
@@ -631,9 +627,6 @@ static int hvm_ioreq_server_init(struct hvm_ioreq_server *s,
hvm_ioreq_server_remove_all_vcpus(s);
hvm_ioreq_server_unmap_pages(s);
- fail_map:
- hvm_ioreq_server_free_rangesets(s);
-
return rc;
}
@@ -770,12 +763,23 @@ int hvm_get_ioreq_server_info(struct domain *d, ioservid_t id,
ASSERT(!IS_DEFAULT(s));
- *ioreq_gfn = gfn_x(s->ioreq.gfn);
+ if ( ioreq_gfn || bufioreq_gfn )
+ {
+ rc = hvm_ioreq_server_map_pages(s);
+ if ( rc )
+ goto out;
+ }
- if ( s->bufioreq.va != NULL )
+ if ( ioreq_gfn )
+ *ioreq_gfn = gfn_x(s->ioreq.gfn);
+
+ if ( HANDLE_BUFIOREQ(s) )
{
- *bufioreq_gfn = gfn_x(s->bufioreq.gfn);
- *bufioreq_port = s->bufioreq_evtchn;
+ if ( bufioreq_gfn )
+ *bufioreq_gfn = gfn_x(s->bufioreq.gfn);
+
+ if ( bufioreq_port )
+ *bufioreq_port = s->bufioreq_evtchn;
}
rc = 0;
@@ -1288,7 +1292,8 @@ static int hvm_send_buffered_ioreq(struct hvm_ioreq_server *s, ioreq_t *p)
pg->ptrs.write_pointer += qw ? 2 : 1;
/* Canonicalize read/write pointers to prevent their overflow. */
- while ( s->bufioreq_atomic && qw++ < IOREQ_BUFFER_SLOT_NUM &&
+ while ( (s->bufioreq_handling == HVM_IOREQSRV_BUFIOREQ_ATOMIC) &&
+ qw++ < IOREQ_BUFFER_SLOT_NUM &&
pg->ptrs.read_pointer >= IOREQ_BUFFER_SLOT_NUM )
{
union bufioreq_pointers old = pg->ptrs, new;
diff --git a/xen/include/asm-x86/hvm/domain.h b/xen/include/asm-x86/hvm/domain.h
index 3bd9c5d7c0..8b798ee4e9 100644
--- a/xen/include/asm-x86/hvm/domain.h
+++ b/xen/include/asm-x86/hvm/domain.h
@@ -69,7 +69,7 @@ struct hvm_ioreq_server {
evtchn_port_t bufioreq_evtchn;
struct rangeset *range[NR_IO_RANGE_TYPES];
bool enabled;
- bool bufioreq_atomic;
+ uint8_t bufioreq_handling;
};
/*
diff --git a/xen/include/public/hvm/dm_op.h b/xen/include/public/hvm/dm_op.h
index 6bbab5fca3..9677bd74e7 100644
--- a/xen/include/public/hvm/dm_op.h
+++ b/xen/include/public/hvm/dm_op.h
@@ -79,28 +79,34 @@ struct xen_dm_op_create_ioreq_server {
* XEN_DMOP_get_ioreq_server_info: Get all the information necessary to
* access IOREQ Server <id>.
*
- * The emulator needs to map the synchronous ioreq structures and buffered
- * ioreq ring (if it exists) that Xen uses to request emulation. These are
- * hosted in the target domain's gmfns <ioreq_gfn> and <bufioreq_gfn>
- * respectively. In addition, if the IOREQ Server is handling buffered
- * emulation requests, the emulator needs to bind to event channel
- * <bufioreq_port> to listen for them. (The event channels used for
- * synchronous emulation requests are specified in the per-CPU ioreq
- * structures in <ioreq_gfn>).
- * If the IOREQ Server is not handling buffered emulation requests then the
- * values handed back in <bufioreq_gfn> and <bufioreq_port> will both be 0.
+ * If the IOREQ Server is handling buffered emulation requests, the
+ * emulator needs to bind to event channel <bufioreq_port> to listen for
+ * them. (The event channels used for synchronous emulation requests are
+ * specified in the per-CPU ioreq structures).
+ * In addition, if the XENMEM_acquire_resource memory op cannot be used,
+ * the emulator will need to map the synchronous ioreq structures and
+ * buffered ioreq ring (if it exists) from guest memory. If <flags> does
+ * not contain XEN_DMOP_no_gfns then these pages will be made available and
+ * the frame numbers passed back in gfns <ioreq_gfn> and <bufioreq_gfn>
+ * respectively. (If the IOREQ Server is not handling buffered emulation
+ * only <ioreq_gfn> will be valid).
*/
#define XEN_DMOP_get_ioreq_server_info 2
struct xen_dm_op_get_ioreq_server_info {
/* IN - server id */
ioservid_t id;
- uint16_t pad;
+ /* IN - flags */
+ uint16_t flags;
+
+#define _XEN_DMOP_no_gfns 0
+#define XEN_DMOP_no_gfns (1u << _XEN_DMOP_no_gfns)
+
/* OUT - buffered ioreq port */
evtchn_port_t bufioreq_port;
- /* OUT - sync ioreq gfn */
+ /* OUT - sync ioreq gfn (see block comment above) */
uint64_aligned_t ioreq_gfn;
- /* OUT - buffered ioreq gfn */
+ /* OUT - buffered ioreq gfn (see block comment above)*/
uint64_aligned_t bufioreq_gfn;
};
--
2.11.0
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v8 05/11] x86/mm: add HYPERVISOR_memory_op to acquire guest resources
2017-09-29 14:51 [PATCH v8 00/11] x86: guest resource mapping Paul Durrant
` (3 preceding siblings ...)
2017-09-29 14:51 ` [PATCH v8 04/11] x86/hvm/ioreq: defer mapping gfns until they are actually requsted Paul Durrant
@ 2017-09-29 14:51 ` Paul Durrant
2017-09-29 14:51 ` [PATCH v8 06/11] x86/hvm/ioreq: add a new mappable resource type Paul Durrant
` (5 subsequent siblings)
10 siblings, 0 replies; 17+ messages in thread
From: Paul Durrant @ 2017-09-29 14:51 UTC (permalink / raw)
To: xen-devel
Cc: Stefano Stabellini, Wei Liu, George Dunlap, Andrew Cooper,
Ian Jackson, Tim Deegan, Paul Durrant, Jan Beulich
Certain memory resources associated with a guest are not necessarily
present in the guest P2M.
This patch adds the boilerplate for new memory op to allow such a resource
to be priv-mapped directly, by either a PV or HVM tools domain.
NOTE: Whilst the new op is not intrinsicly specific to the x86 architecture,
I have no means to test it on an ARM platform and so cannot verify
that it functions correctly. Hence it is currently only implemented
for x86.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
---
Cc: George Dunlap <george.dunlap@eu.citrix.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: George Dunlap <George.Dunlap@eu.citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Tim Deegan <tim@xen.org>
Cc: Wei Liu <wei.liu2@citrix.com>
v8:
- Move the code into common as requested by Jan.
- Make the gmfn_list handle a 64-bit type to avoid limiting the MFN
range for a 32-bit tools domain.
- Add missing pad.
- Add compat code.
- Make this patch deal with purely boilerplate.
- Drop George's A-b and Wei's R-b because the changes are non-trivial,
and update Cc list now the boilerplate is common.
v5:
- Switched __copy_to/from_guest_offset() to copy_to/from_guest_offset().
---
xen/arch/x86/mm/p2m.c | 3 +-
xen/common/compat/memory.c | 52 ++++++++++++++++++++++++++++++
xen/common/memory.c | 77 +++++++++++++++++++++++++++++++++++++++++++++
xen/include/asm-x86/p2m.h | 3 ++
xen/include/public/memory.h | 32 ++++++++++++++++++-
xen/include/xlat.lst | 1 +
6 files changed, 165 insertions(+), 3 deletions(-)
diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index 0b479105b9..d0f8fc249b 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -1121,8 +1121,7 @@ static int set_typed_p2m_entry(struct domain *d, unsigned long gfn, mfn_t mfn,
}
/* Set foreign mfn in the given guest's p2m table. */
-static int set_foreign_p2m_entry(struct domain *d, unsigned long gfn,
- mfn_t mfn)
+int set_foreign_p2m_entry(struct domain *d, unsigned long gfn, mfn_t mfn)
{
return set_typed_p2m_entry(d, gfn, mfn, PAGE_ORDER_4K, p2m_map_foreign,
p2m_get_hostp2m(d)->default_access);
diff --git a/xen/common/compat/memory.c b/xen/common/compat/memory.c
index 35bb259808..3af7922e59 100644
--- a/xen/common/compat/memory.c
+++ b/xen/common/compat/memory.c
@@ -71,6 +71,7 @@ int compat_memory_op(unsigned int cmd, XEN_GUEST_HANDLE_PARAM(void) compat)
struct xen_remove_from_physmap *xrfp;
struct xen_vnuma_topology_info *vnuma;
struct xen_mem_access_op *mao;
+ struct xen_mem_acquire_resource *mar;
} nat;
union {
struct compat_memory_reservation rsrv;
@@ -79,6 +80,7 @@ int compat_memory_op(unsigned int cmd, XEN_GUEST_HANDLE_PARAM(void) compat)
struct compat_add_to_physmap_batch atpb;
struct compat_vnuma_topology_info vnuma;
struct compat_mem_access_op mao;
+ struct compat_mem_acquire_resource mar;
} cmp;
set_xen_guest_handle(nat.hnd, COMPAT_ARG_XLAT_VIRT_BASE);
@@ -395,6 +397,39 @@ int compat_memory_op(unsigned int cmd, XEN_GUEST_HANDLE_PARAM(void) compat)
}
#endif
+ case XENMEM_acquire_resource:
+ {
+ xen_ulong_t *gmfn_list = (xen_ulong_t *)(nat.mar + 1);
+
+ if ( copy_from_guest(&cmp.mar, compat, 1) ||
+ !compat_handle_okay(cmp.mar.gmfn_list,
+ cmp.mar.nr_frames) )
+ return -EFAULT;
+
+ if ( sizeof(*gmfn_list) * cmp.mar.nr_frames >
+ COMPAT_ARG_XLAT_SIZE - sizeof(*nat.mar) )
+ return -E2BIG;
+
+ for ( i = 0; i < cmp.mar.nr_frames; i++ )
+ {
+ compat_ulong_t gmfn;
+
+ if ( __copy_from_compat_offset(&gmfn, cmp.mar.gmfn_list,
+ i, 1) )
+ return -EFAULT;
+
+ gmfn_list[i] = gmfn;
+ }
+
+#define XLAT_mem_acquire_resource_HNDL_gmfn_list(_d_, _s_) \
+ set_xen_guest_handle((_d_)->gmfn_list, gmfn_list)
+
+ XLAT_mem_acquire_resource(nat.mar, &cmp.mar);
+
+#undef XLAT_mem_acquire_resource_HNDL_gmfn_list
+
+ break;
+ }
default:
return compat_arch_memory_op(cmd, compat);
}
@@ -535,6 +570,23 @@ int compat_memory_op(unsigned int cmd, XEN_GUEST_HANDLE_PARAM(void) compat)
rc = -EFAULT;
break;
+ case XENMEM_acquire_resource:
+ {
+ xen_ulong_t *gmfn_list = (xen_ulong_t *)(nat.mar + 1);
+
+ for ( i = 0; i < cmp.mar.nr_frames; i++ )
+ {
+ compat_ulong_t gmfn = gmfn_list[i];
+
+ if ( gmfn != gmfn_list[i] )
+ return -ERANGE;
+
+ if ( __copy_to_compat_offset(cmp.mar.gmfn_list, i,
+ &gmfn, 1) )
+ return -EFAULT;
+ }
+ break;
+ }
default:
domain_crash(current->domain);
split = 0;
diff --git a/xen/common/memory.c b/xen/common/memory.c
index a2abf554e3..a56bfcc88f 100644
--- a/xen/common/memory.c
+++ b/xen/common/memory.c
@@ -964,6 +964,67 @@ static long xatp_permission_check(struct domain *d, unsigned int space)
return xsm_add_to_physmap(XSM_TARGET, current->domain, d);
}
+#ifdef CONFIG_X86
+static int acquire_resource(const xen_mem_acquire_resource_t *xmar)
+{
+ struct domain *d, *currd = current->domain;
+ unsigned long mfn_list[2];
+ int rc;
+
+ if ( xmar->nr_frames == 0 || xmar->pad != 0 )
+ return -EINVAL;
+
+ if ( xmar->nr_frames > ARRAY_SIZE(mfn_list) )
+ return -E2BIG;
+
+ d = rcu_lock_domain_by_any_id(xmar->domid);
+ if ( d == NULL )
+ return -ESRCH;
+
+ rc = xsm_domain_memory_map(XSM_TARGET, d);
+ if ( rc )
+ goto out;
+
+ switch ( xmar->type )
+ {
+ default:
+ rc = -EOPNOTSUPP;
+ break;
+ }
+
+ if ( rc )
+ goto out;
+
+ if ( !paging_mode_translate(currd) )
+ {
+ if ( copy_to_guest_offset(xmar->gmfn_list, 0, mfn_list,
+ xmar->nr_frames) )
+ rc = -EFAULT;
+ }
+ else
+ {
+ unsigned int i;
+
+ for ( i = 0; i < xmar->nr_frames; i++ )
+ {
+ xen_pfn_t gfn;
+
+ rc = -EFAULT;
+ if ( copy_from_guest_offset(&gfn, xmar->gmfn_list, i, 1) )
+ goto out;
+
+ rc = set_foreign_p2m_entry(currd, gfn, _mfn(mfn_list[i]));
+ if ( rc )
+ goto out;
+ }
+ }
+
+ out:
+ rcu_unlock_domain(d);
+ return rc;
+}
+#endif /* CONFIG_X86 */
+
long do_memory_op(unsigned long cmd, XEN_GUEST_HANDLE_PARAM(void) arg)
{
struct domain *d, *curr_d = current->domain;
@@ -1405,6 +1466,22 @@ long do_memory_op(unsigned long cmd, XEN_GUEST_HANDLE_PARAM(void) arg)
}
#endif
+ case XENMEM_acquire_resource:
+#ifdef CONFIG_X86
+ {
+ xen_mem_acquire_resource_t xmar;
+
+ if ( copy_from_guest(&xmar, arg, 1) )
+ return -EFAULT;
+
+ rc = acquire_resource(&xmar);
+ break;
+ }
+#else
+ rc = -EOPNOTSUPP;
+ break;
+#endif
+
default:
rc = arch_memory_op(cmd, arg);
break;
diff --git a/xen/include/asm-x86/p2m.h b/xen/include/asm-x86/p2m.h
index 10cdfc09a9..4eff0458bc 100644
--- a/xen/include/asm-x86/p2m.h
+++ b/xen/include/asm-x86/p2m.h
@@ -613,6 +613,9 @@ void p2m_memory_type_changed(struct domain *d);
int p2m_is_logdirty_range(struct p2m_domain *, unsigned long start,
unsigned long end);
+/* Set foreign entry in the p2m table (for priv-mapping) */
+int set_foreign_p2m_entry(struct domain *d, unsigned long gfn, mfn_t mfn);
+
/* Set mmio addresses in the p2m table (for pass-through) */
int set_mmio_p2m_entry(struct domain *d, unsigned long gfn, mfn_t mfn,
unsigned int order, p2m_access_t access);
diff --git a/xen/include/public/memory.h b/xen/include/public/memory.h
index 29386df98b..3aa8fb2fe1 100644
--- a/xen/include/public/memory.h
+++ b/xen/include/public/memory.h
@@ -599,6 +599,36 @@ struct xen_reserved_device_memory_map {
typedef struct xen_reserved_device_memory_map xen_reserved_device_memory_map_t;
DEFINE_XEN_GUEST_HANDLE(xen_reserved_device_memory_map_t);
+/*
+ * Get the pages for a particular guest resource, so that they can be
+ * mapped directly by a tools domain.
+ */
+#define XENMEM_acquire_resource 28
+struct xen_mem_acquire_resource {
+ /* IN - the domain whose resource is to be mapped */
+ domid_t domid;
+ /* IN - the type of resource */
+ uint16_t type;
+ /*
+ * IN - a type-specific resource identifier, which must be zero
+ * unless stated otherwise.
+ */
+ uint32_t id;
+ /* IN - number of (4K) frames of the resource to be mapped */
+ uint32_t nr_frames;
+ uint32_t pad;
+ /* IN - the index of the initial frame to be mapped */
+ uint64_aligned_t frame;
+ /* IN/OUT - If the tools domain is PV then, upon return, gmfn_list
+ * will be populated with the MFNs of the resource.
+ * If the tools domain is HVM then it is expected that, on
+ * entry, gmfn_list will be populated with a list of GFNs
+ * that will be mapped to the MFNs of the resource.
+ */
+ XEN_GUEST_HANDLE(xen_ulong_t) gmfn_list;
+};
+typedef struct xen_mem_acquire_resource xen_mem_acquire_resource_t;
+
#endif /* defined(__XEN__) || defined(__XEN_TOOLS__) */
/*
@@ -650,7 +680,7 @@ struct xen_vnuma_topology_info {
typedef struct xen_vnuma_topology_info xen_vnuma_topology_info_t;
DEFINE_XEN_GUEST_HANDLE(xen_vnuma_topology_info_t);
-/* Next available subop number is 28 */
+/* Next available subop number is 29 */
#endif /* __XEN_PUBLIC_MEMORY_H__ */
diff --git a/xen/include/xlat.lst b/xen/include/xlat.lst
index 0f17000ea7..5835872334 100644
--- a/xen/include/xlat.lst
+++ b/xen/include/xlat.lst
@@ -83,6 +83,7 @@
! memory_map memory.h
! memory_reservation memory.h
! mem_access_op memory.h
+! mem_acquire_resource memory.h
! pod_target memory.h
! remove_from_physmap memory.h
! reserved_device_memory_map memory.h
--
2.11.0
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v8 06/11] x86/hvm/ioreq: add a new mappable resource type...
2017-09-29 14:51 [PATCH v8 00/11] x86: guest resource mapping Paul Durrant
` (4 preceding siblings ...)
2017-09-29 14:51 ` [PATCH v8 05/11] x86/mm: add HYPERVISOR_memory_op to acquire guest resources Paul Durrant
@ 2017-09-29 14:51 ` Paul Durrant
2017-09-29 14:51 ` [PATCH v8 07/11] x86/mm: add an extra command to HYPERVISOR_mmu_update Paul Durrant
` (4 subsequent siblings)
10 siblings, 0 replies; 17+ messages in thread
From: Paul Durrant @ 2017-09-29 14:51 UTC (permalink / raw)
To: xen-devel
Cc: Stefano Stabellini, Andrew Cooper, Ian Jackson, Tim Deegan,
Paul Durrant, Jan Beulich
... XENMEM_resource_ioreq_server
This patch adds support for a new resource type that can be mapped using
the XENMEM_acquire_resource memory op.
If an emulator makes use of this resource type then, instead of mapping
gfns, the IOREQ server will allocate pages from the heap. These pages
will never be present in the P2M of the guest at any point and so are
not vulnerable to any direct attack by the guest. They are only ever
accessible by Xen and any domain that has mapping privilege over the
guest (which may or may not be limited to the domain running the emulator).
NOTE: Use of the new resource type is not compatible with use of
XEN_DMOP_get_ioreq_server_info unless the XEN_DMOP_no_gfns flag is
set.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Acked-by: George Dunlap <George.Dunlap@eu.citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
---
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Tim Deegan <tim@xen.org>
v8:
- Re-base on new boilerplate.
- Adjust function signature of hvm_get_ioreq_server_frame(), and test
whether the bufioreq page is present.
v5:
- Use get_ioreq_server() function rather than indexing array directly.
- Add more explanation into comments to state than mapping guest frames
and allocation of pages for ioreq servers are not simultaneously
permitted.
- Add a comment into asm/ioreq.h stating the meaning of the index
value passed to hvm_get_ioreq_server_frame().
---
xen/arch/x86/hvm/ioreq.c | 140 ++++++++++++++++++++++++++++++++++++++++
xen/arch/x86/mm.c | 22 +++++++
xen/common/memory.c | 5 ++
xen/include/asm-x86/hvm/ioreq.h | 6 ++
xen/include/asm-x86/mm.h | 5 ++
xen/include/public/hvm/dm_op.h | 4 ++
xen/include/public/memory.h | 13 +++-
7 files changed, 194 insertions(+), 1 deletion(-)
diff --git a/xen/arch/x86/hvm/ioreq.c b/xen/arch/x86/hvm/ioreq.c
index d68d7d0c1f..fc13a6ffc4 100644
--- a/xen/arch/x86/hvm/ioreq.c
+++ b/xen/arch/x86/hvm/ioreq.c
@@ -269,6 +269,19 @@ static int hvm_map_ioreq_gfn(struct hvm_ioreq_server *s, bool buf)
struct hvm_ioreq_page *iorp = buf ? &s->bufioreq : &s->ioreq;
int rc;
+ if ( iorp->page )
+ {
+ /*
+ * If a page has already been allocated (which will happen on
+ * demand if hvm_get_ioreq_server_frame() is called), then
+ * mapping a guest frame is not permitted.
+ */
+ if ( gfn_eq(iorp->gfn, INVALID_GFN) )
+ return -EPERM;
+
+ return 0;
+ }
+
if ( d->is_dying )
return -EINVAL;
@@ -291,6 +304,61 @@ static int hvm_map_ioreq_gfn(struct hvm_ioreq_server *s, bool buf)
return rc;
}
+static int hvm_alloc_ioreq_mfn(struct hvm_ioreq_server *s, bool buf)
+{
+ struct domain *currd = current->domain;
+ struct hvm_ioreq_page *iorp = buf ? &s->bufioreq : &s->ioreq;
+
+ if ( iorp->page )
+ {
+ /*
+ * If a guest frame has already been mapped (which may happen
+ * on demand if hvm_get_ioreq_server_info() is called), then
+ * allocating a page is not permitted.
+ */
+ if ( !gfn_eq(iorp->gfn, INVALID_GFN) )
+ return -EPERM;
+
+ return 0;
+ }
+
+ /*
+ * Allocated IOREQ server pages are assigned to the emulating
+ * domain, not the target domain. This is because the emulator is
+ * likely to be destroyed after the target domain has been torn
+ * down, and we must use MEMF_no_refcount otherwise page allocation
+ * could fail if the emulating domain has already reached its
+ * maximum allocation.
+ */
+ iorp->page = alloc_domheap_page(currd, MEMF_no_refcount);
+ if ( !iorp->page )
+ return -ENOMEM;
+
+ iorp->va = __map_domain_page_global(iorp->page);
+ if ( !iorp->va )
+ {
+ iorp->page = NULL;
+ return -ENOMEM;
+ }
+
+ clear_page(iorp->va);
+ return 0;
+}
+
+static void hvm_free_ioreq_mfn(struct hvm_ioreq_server *s, bool buf)
+{
+ struct hvm_ioreq_page *iorp = buf ? &s->bufioreq : &s->ioreq;
+
+ if ( !iorp->page )
+ return;
+
+ unmap_domain_page_global(iorp->va);
+ iorp->va = NULL;
+
+ put_page(iorp->page);
+ iorp->page = NULL;
+}
+
bool is_ioreq_server_page(struct domain *d, const struct page_info *page)
{
const struct hvm_ioreq_server *s;
@@ -497,6 +565,27 @@ static void hvm_ioreq_server_unmap_pages(struct hvm_ioreq_server *s)
hvm_unmap_ioreq_gfn(s, false);
}
+static int hvm_ioreq_server_alloc_pages(struct hvm_ioreq_server *s)
+{
+ int rc;
+
+ rc = hvm_alloc_ioreq_mfn(s, false);
+
+ if ( !rc && (s->bufioreq_handling != HVM_IOREQSRV_BUFIOREQ_OFF) )
+ rc = hvm_alloc_ioreq_mfn(s, true);
+
+ if ( rc )
+ hvm_free_ioreq_mfn(s, false);
+
+ return rc;
+}
+
+static void hvm_ioreq_server_free_pages(struct hvm_ioreq_server *s)
+{
+ hvm_free_ioreq_mfn(s, true);
+ hvm_free_ioreq_mfn(s, false);
+}
+
static void hvm_ioreq_server_free_rangesets(struct hvm_ioreq_server *s)
{
unsigned int i;
@@ -625,7 +714,18 @@ static int hvm_ioreq_server_init(struct hvm_ioreq_server *s,
fail_add:
hvm_ioreq_server_remove_all_vcpus(s);
+
+ /*
+ * NOTE: It is safe to call both hvm_ioreq_server_unmap_pages() and
+ * hvm_ioreq_server_free_pages() in that order.
+ * This is because the former will do nothing if the pages
+ * are not mapped, leaving the page to be freed by the latter.
+ * However if the pages are mapped then the former will set
+ * the page_info pointer to NULL, meaning the latter will do
+ * nothing.
+ */
hvm_ioreq_server_unmap_pages(s);
+ hvm_ioreq_server_free_pages(s);
return rc;
}
@@ -635,6 +735,7 @@ static void hvm_ioreq_server_deinit(struct hvm_ioreq_server *s)
ASSERT(!s->enabled);
hvm_ioreq_server_remove_all_vcpus(s);
hvm_ioreq_server_unmap_pages(s);
+ hvm_ioreq_server_free_pages(s);
hvm_ioreq_server_free_rangesets(s);
}
@@ -790,6 +891,45 @@ int hvm_get_ioreq_server_info(struct domain *d, ioservid_t id,
return rc;
}
+int hvm_get_ioreq_server_frame(struct domain *d, ioservid_t id,
+ unsigned int idx, mfn_t *mfn)
+{
+ struct hvm_ioreq_server *s;
+ int rc;
+
+ spin_lock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
+
+ if ( id == DEFAULT_IOSERVID )
+ return -EOPNOTSUPP;
+
+ s = get_ioreq_server(d, id);
+
+ ASSERT(!IS_DEFAULT(s));
+
+ rc = hvm_ioreq_server_alloc_pages(s);
+ if ( rc )
+ goto out;
+
+ if ( idx == 0 )
+ {
+ rc = -ENOENT;
+ if ( !HANDLE_BUFIOREQ(s) )
+ goto out;
+
+ *mfn = _mfn(page_to_mfn(s->bufioreq.page));
+ rc = 0;
+ }
+ else if ( idx == 1 )
+ *mfn = _mfn(page_to_mfn(s->ioreq.page));
+ else
+ rc = -EINVAL;
+
+ out:
+ spin_unlock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
+
+ return rc;
+}
+
int hvm_map_io_range_to_ioreq_server(struct domain *d, ioservid_t id,
uint32_t type, uint64_t start,
uint64_t end)
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index d9df5ca69f..c9bc4a4e92 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -122,6 +122,7 @@
#include <asm/fixmap.h>
#include <asm/io_apic.h>
#include <asm/pci.h>
+#include <asm/hvm/ioreq.h>
#include <asm/hvm/grant_table.h>
#include <asm/pv/grant_table.h>
@@ -3866,6 +3867,27 @@ int xenmem_add_to_physmap_one(
return rc;
}
+int xenmem_acquire_ioreq_server(struct domain *d, unsigned int id,
+ unsigned long frame,
+ unsigned long nr_frames,
+ unsigned long mfn_list[])
+{
+ unsigned int i;
+
+ for ( i = 0; i < nr_frames; i++ )
+ {
+ mfn_t mfn;
+ int rc = hvm_get_ioreq_server_frame(d, id, frame + i, &mfn);
+
+ if ( rc )
+ return rc;
+
+ mfn_list[i] = mfn_x(mfn);
+ }
+
+ return 0;
+}
+
long arch_memory_op(unsigned long cmd, XEN_GUEST_HANDLE_PARAM(void) arg)
{
int rc;
diff --git a/xen/common/memory.c b/xen/common/memory.c
index a56bfcc88f..a068877cf6 100644
--- a/xen/common/memory.c
+++ b/xen/common/memory.c
@@ -987,6 +987,11 @@ static int acquire_resource(const xen_mem_acquire_resource_t *xmar)
switch ( xmar->type )
{
+ case XENMEM_resource_ioreq_server:
+ rc = xenmem_acquire_ioreq_server(d, xmar->id, xmar->frame,
+ xmar->nr_frames, mfn_list);
+ break;
+
default:
rc = -EOPNOTSUPP;
break;
diff --git a/xen/include/asm-x86/hvm/ioreq.h b/xen/include/asm-x86/hvm/ioreq.h
index 1829fcf43e..a4f58dc9ee 100644
--- a/xen/include/asm-x86/hvm/ioreq.h
+++ b/xen/include/asm-x86/hvm/ioreq.h
@@ -31,6 +31,12 @@ int hvm_get_ioreq_server_info(struct domain *d, ioservid_t id,
unsigned long *ioreq_gfn,
unsigned long *bufioreq_gfn,
evtchn_port_t *bufioreq_port);
+/*
+ * Get the mfn of either the buffered or synchronous ioreq frame.
+ * (idx == 0 -> buffered, idx == 1 -> synchronous).
+ */
+int hvm_get_ioreq_server_frame(struct domain *d, ioservid_t id,
+ unsigned int idx, mfn_t *mfn);
int hvm_map_io_range_to_ioreq_server(struct domain *d, ioservid_t id,
uint32_t type, uint64_t start,
uint64_t end);
diff --git a/xen/include/asm-x86/mm.h b/xen/include/asm-x86/mm.h
index f2e0f498c4..637b1eee1c 100644
--- a/xen/include/asm-x86/mm.h
+++ b/xen/include/asm-x86/mm.h
@@ -615,4 +615,9 @@ static inline bool arch_mfn_in_directmap(unsigned long mfn)
return mfn <= (virt_to_mfn(eva - 1) + 1);
}
+int xenmem_acquire_ioreq_server(struct domain *d, unsigned int id,
+ unsigned long frame,
+ unsigned long nr_frames,
+ unsigned long mfn_list[]);
+
#endif /* __ASM_X86_MM_H__ */
diff --git a/xen/include/public/hvm/dm_op.h b/xen/include/public/hvm/dm_op.h
index 9677bd74e7..59b6006910 100644
--- a/xen/include/public/hvm/dm_op.h
+++ b/xen/include/public/hvm/dm_op.h
@@ -90,6 +90,10 @@ struct xen_dm_op_create_ioreq_server {
* the frame numbers passed back in gfns <ioreq_gfn> and <bufioreq_gfn>
* respectively. (If the IOREQ Server is not handling buffered emulation
* only <ioreq_gfn> will be valid).
+ *
+ * NOTE: To access the synchronous ioreq structures and buffered ioreq
+ * ring, it is preferable to use the XENMEM_acquire_resource memory
+ * op specifying resource type XENMEM_resource_ioreq_server.
*/
#define XEN_DMOP_get_ioreq_server_info 2
diff --git a/xen/include/public/memory.h b/xen/include/public/memory.h
index 3aa8fb2fe1..e30a4d9794 100644
--- a/xen/include/public/memory.h
+++ b/xen/include/public/memory.h
@@ -609,15 +609,26 @@ struct xen_mem_acquire_resource {
domid_t domid;
/* IN - the type of resource */
uint16_t type;
+
+#define XENMEM_resource_ioreq_server 0
+
/*
* IN - a type-specific resource identifier, which must be zero
* unless stated otherwise.
+ *
+ * type == XENMEM_resource_ioreq_server -> id == ioreq server id
*/
uint32_t id;
/* IN - number of (4K) frames of the resource to be mapped */
uint32_t nr_frames;
uint32_t pad;
- /* IN - the index of the initial frame to be mapped */
+ /* IN - the index of the initial frame to be mapped
+ *
+ * type == XENMEM_resource_ioreq_server -> frame == 0 -> bufioreq
+ * page
+ * frame == 1 -> ioreq
+ * page
+ */
uint64_aligned_t frame;
/* IN/OUT - If the tools domain is PV then, upon return, gmfn_list
* will be populated with the MFNs of the resource.
--
2.11.0
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v8 07/11] x86/mm: add an extra command to HYPERVISOR_mmu_update...
2017-09-29 14:51 [PATCH v8 00/11] x86: guest resource mapping Paul Durrant
` (5 preceding siblings ...)
2017-09-29 14:51 ` [PATCH v8 06/11] x86/hvm/ioreq: add a new mappable resource type Paul Durrant
@ 2017-09-29 14:51 ` Paul Durrant
2017-09-29 14:51 ` [PATCH v8 08/11] tools/libxenforeignmemory: add support for resource mapping Paul Durrant
` (3 subsequent siblings)
10 siblings, 0 replies; 17+ messages in thread
From: Paul Durrant @ 2017-09-29 14:51 UTC (permalink / raw)
To: xen-devel
Cc: Stefano Stabellini, Wei Liu, George Dunlap, Andrew Cooper,
Ian Jackson, Tim Deegan, Paul Durrant, Jan Beulich
...to allow the calling domain to prevent translation of specified l1e
value.
Despite what the comment in public/xen.h might imply, specifying a
command value of MMU_NORMAL_PT_UPDATE will not simply update an l1e with
the specified value. Instead, mod_l1_entry() tests whether foreign_dom
has PG_translate set in its paging mode and, if it does, assumes that the
the pfn value in the l1e is a gfn rather than an mfn.
To allow PV tools domain to map mfn values from a previously issued
HYPERVISOR_memory_op:XENMEM_acquire_resource, there needs to be a way
to tell HYPERVISOR_mmu_update that the specific l1e value does not
require translation regardless of the paging mode of foreign_dom. This
patch therefore defines a new command value, MMU_PT_UPDATE_NO_TRANSLATE,
which has the same semantics as MMU_NORMAL_PT_UPDATE except that the
paging mode of foreign_dom is ignored and the l1e value is used verbatim.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
---
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: George Dunlap <George.Dunlap@eu.citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Tim Deegan <tim@xen.org>
Cc: Wei Liu <wei.liu2@citrix.com>
v8:
- New in this version, replacing "allow a privileged PV domain to map
guest mfns".
---
xen/arch/x86/mm.c | 17 ++++++++++-------
xen/include/public/xen.h | 12 +++++++++---
2 files changed, 19 insertions(+), 10 deletions(-)
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index c9bc4a4e92..d63ab049f9 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -1619,9 +1619,10 @@ void page_unlock(struct page_info *page)
/* Update the L1 entry at pl1e to new value nl1e. */
static int mod_l1_entry(l1_pgentry_t *pl1e, l1_pgentry_t nl1e,
- unsigned long gl1mfn, int preserve_ad,
+ unsigned long gl1mfn, int cmd,
struct vcpu *pt_vcpu, struct domain *pg_dom)
{
+ bool preserve_ad = (cmd == MMU_PT_UPDATE_PRESERVE_AD);
l1_pgentry_t ol1e;
struct domain *pt_dom = pt_vcpu->domain;
int rc = 0;
@@ -1643,7 +1644,8 @@ static int mod_l1_entry(l1_pgentry_t *pl1e, l1_pgentry_t nl1e,
return -EINVAL;
}
- if ( paging_mode_translate(pg_dom) )
+ if ( cmd != MMU_PT_UPDATE_NO_TRANSLATE &&
+ paging_mode_translate(pg_dom) )
{
page = get_page_from_gfn(pg_dom, l1e_get_pfn(nl1e), NULL, P2M_ALLOC);
if ( !page )
@@ -3258,6 +3260,7 @@ long do_mmu_update(
*/
case MMU_NORMAL_PT_UPDATE:
case MMU_PT_UPDATE_PRESERVE_AD:
+ case MMU_PT_UPDATE_NO_TRANSLATE:
{
p2m_type_t p2mt;
@@ -3323,7 +3326,8 @@ long do_mmu_update(
p2m_query_t q = (l1e_get_flags(l1e) & _PAGE_RW) ?
P2M_UNSHARE : P2M_ALLOC;
- if ( paging_mode_translate(pg_owner) )
+ if ( cmd != MMU_PT_UPDATE_NO_TRANSLATE &&
+ paging_mode_translate(pg_owner) )
target = get_page_from_gfn(pg_owner, l1e_get_pfn(l1e),
&l1e_p2mt, q);
@@ -3350,9 +3354,7 @@ long do_mmu_update(
break;
}
- rc = mod_l1_entry(va, l1e, mfn,
- cmd == MMU_PT_UPDATE_PRESERVE_AD, v,
- pg_owner);
+ rc = mod_l1_entry(va, l1e, mfn, cmd, v, pg_owner);
if ( target )
put_page(target);
}
@@ -3630,7 +3632,8 @@ static int __do_update_va_mapping(
goto out;
}
- rc = mod_l1_entry(pl1e, val, mfn_x(gl1mfn), 0, v, pg_owner);
+ rc = mod_l1_entry(pl1e, val, mfn_x(gl1mfn), MMU_NORMAL_PT_UPDATE, v,
+ pg_owner);
page_unlock(gl1pg);
put_page(gl1pg);
diff --git a/xen/include/public/xen.h b/xen/include/public/xen.h
index 2ac6b1e24d..d2014a39eb 100644
--- a/xen/include/public/xen.h
+++ b/xen/include/public/xen.h
@@ -268,6 +268,10 @@ DEFINE_XEN_GUEST_HANDLE(xen_ulong_t);
* As MMU_NORMAL_PT_UPDATE above, but A/D bits currently in the PTE are ORed
* with those in @val.
*
+ * ptr[1:0] == MMU_PT_UPDATE_NO_TRANSLATE:
+ * As MMU_NORMAL_PT_UPDATE above, but @val is not translated though FD
+ * page tables.
+ *
* @val is usually the machine frame number along with some attributes.
* The attributes by default follow the architecture defined bits. Meaning that
* if this is a X86_64 machine and four page table layout is used, the layout
@@ -334,9 +338,11 @@ DEFINE_XEN_GUEST_HANDLE(xen_ulong_t);
*
* PAT (bit 7 on) --> PWT (bit 3 on) and clear bit 7.
*/
-#define MMU_NORMAL_PT_UPDATE 0 /* checked '*ptr = val'. ptr is MA. */
-#define MMU_MACHPHYS_UPDATE 1 /* ptr = MA of frame to modify entry for */
-#define MMU_PT_UPDATE_PRESERVE_AD 2 /* atomically: *ptr = val | (*ptr&(A|D)) */
+#define MMU_NORMAL_PT_UPDATE 0 /* checked '*ptr = val'. ptr is MA. */
+#define MMU_MACHPHYS_UPDATE 1 /* ptr = MA of frame to modify entry for */
+#define MMU_PT_UPDATE_PRESERVE_AD 2 /* atomically: *ptr = val | (*ptr&(A|D)) */
+#define MMU_PT_UPDATE_NO_TRANSLATE 3 /* checked '*ptr = val'. prt is MA. */
+ /* val never translated. */
/*
* MMU EXTENDED OPERATIONS
--
2.11.0
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v8 08/11] tools/libxenforeignmemory: add support for resource mapping
2017-09-29 14:51 [PATCH v8 00/11] x86: guest resource mapping Paul Durrant
` (6 preceding siblings ...)
2017-09-29 14:51 ` [PATCH v8 07/11] x86/mm: add an extra command to HYPERVISOR_mmu_update Paul Durrant
@ 2017-09-29 14:51 ` Paul Durrant
2017-09-29 14:51 ` [PATCH v8 09/11] tools/libxenforeignmemory: reduce xenforeignmemory_restrict code footprint Paul Durrant
` (2 subsequent siblings)
10 siblings, 0 replies; 17+ messages in thread
From: Paul Durrant @ 2017-09-29 14:51 UTC (permalink / raw)
To: xen-devel; +Cc: Paul Durrant, Ian Jackson
A previous patch introduced a new HYPERVISOR_memory_op to acquire guest
resources for direct priv-mapping.
This patch adds new functionality into libxenforeignmemory to make use
of a new privcmd ioctl [1] that uses the new memory op to make such
resources available via mmap(2).
[1] http://xenbits.xen.org/gitweb/?p=people/pauldu/linux.git;a=commit;h=ce59a05e6712
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
---
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
v4:
- Fixed errno and removed single-use label
- The unmap call now returns a status
- Use C99 initialization for ioctl struct
v2:
- Bump minor version up to 3.
---
tools/include/xen-sys/Linux/privcmd.h | 11 +++++
tools/libs/foreignmemory/Makefile | 2 +-
tools/libs/foreignmemory/core.c | 53 ++++++++++++++++++++++
.../libs/foreignmemory/include/xenforeignmemory.h | 41 +++++++++++++++++
tools/libs/foreignmemory/libxenforeignmemory.map | 5 ++
tools/libs/foreignmemory/linux.c | 45 ++++++++++++++++++
tools/libs/foreignmemory/private.h | 31 +++++++++++++
7 files changed, 187 insertions(+), 1 deletion(-)
diff --git a/tools/include/xen-sys/Linux/privcmd.h b/tools/include/xen-sys/Linux/privcmd.h
index 732ff7c15a..9531b728f9 100644
--- a/tools/include/xen-sys/Linux/privcmd.h
+++ b/tools/include/xen-sys/Linux/privcmd.h
@@ -86,6 +86,15 @@ typedef struct privcmd_dm_op {
const privcmd_dm_op_buf_t __user *ubufs;
} privcmd_dm_op_t;
+typedef struct privcmd_mmap_resource {
+ domid_t dom;
+ __u32 type;
+ __u32 id;
+ __u32 idx;
+ __u64 num;
+ __u64 addr;
+} privcmd_mmap_resource_t;
+
/*
* @cmd: IOCTL_PRIVCMD_HYPERCALL
* @arg: &privcmd_hypercall_t
@@ -103,5 +112,7 @@ typedef struct privcmd_dm_op {
_IOC(_IOC_NONE, 'P', 5, sizeof(privcmd_dm_op_t))
#define IOCTL_PRIVCMD_RESTRICT \
_IOC(_IOC_NONE, 'P', 6, sizeof(domid_t))
+#define IOCTL_PRIVCMD_MMAP_RESOURCE \
+ _IOC(_IOC_NONE, 'P', 7, sizeof(privcmd_mmap_resource_t))
#endif /* __LINUX_PUBLIC_PRIVCMD_H__ */
diff --git a/tools/libs/foreignmemory/Makefile b/tools/libs/foreignmemory/Makefile
index ab7f873f26..5c7f78f61d 100644
--- a/tools/libs/foreignmemory/Makefile
+++ b/tools/libs/foreignmemory/Makefile
@@ -2,7 +2,7 @@ XEN_ROOT = $(CURDIR)/../../..
include $(XEN_ROOT)/tools/Rules.mk
MAJOR = 1
-MINOR = 2
+MINOR = 3
SHLIB_LDFLAGS += -Wl,--version-script=libxenforeignmemory.map
CFLAGS += -Werror -Wmissing-prototypes
diff --git a/tools/libs/foreignmemory/core.c b/tools/libs/foreignmemory/core.c
index a6897dc561..8d3f9f178f 100644
--- a/tools/libs/foreignmemory/core.c
+++ b/tools/libs/foreignmemory/core.c
@@ -17,6 +17,8 @@
#include <assert.h>
#include <errno.h>
+#include <sys/mman.h>
+
#include "private.h"
xenforeignmemory_handle *xenforeignmemory_open(xentoollog_logger *logger,
@@ -120,6 +122,57 @@ int xenforeignmemory_restrict(xenforeignmemory_handle *fmem,
return osdep_xenforeignmemory_restrict(fmem, domid);
}
+xenforeignmemory_resource_handle *xenforeignmemory_map_resource(
+ xenforeignmemory_handle *fmem, domid_t domid, unsigned int type,
+ unsigned int id, unsigned long frame, unsigned long nr_frames,
+ void **paddr, int prot, int flags)
+{
+ xenforeignmemory_resource_handle *fres;
+ int rc;
+
+ /* Check flags only contains POSIX defined values */
+ if ( flags & ~(MAP_SHARED | MAP_PRIVATE) )
+ {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ fres = calloc(1, sizeof(*fres));
+ if ( !fres )
+ {
+ errno = ENOMEM;
+ return NULL;
+ }
+
+ fres->domid = domid;
+ fres->type = type;
+ fres->id = id;
+ fres->frame = frame;
+ fres->nr_frames = nr_frames;
+ fres->addr = *paddr;
+ fres->prot = prot;
+ fres->flags = flags;
+
+ rc = osdep_xenforeignmemory_map_resource(fmem, fres);
+ if ( rc )
+ {
+ free(fres);
+ fres = NULL;
+ } else
+ *paddr = fres->addr;
+
+ return fres;
+}
+
+int xenforeignmemory_unmap_resource(
+ xenforeignmemory_handle *fmem, xenforeignmemory_resource_handle *fres)
+{
+ int rc = osdep_xenforeignmemory_unmap_resource(fmem, fres);
+
+ free(fres);
+ return rc;
+}
+
/*
* Local variables:
* mode: C
diff --git a/tools/libs/foreignmemory/include/xenforeignmemory.h b/tools/libs/foreignmemory/include/xenforeignmemory.h
index f4814c390f..d594be8df0 100644
--- a/tools/libs/foreignmemory/include/xenforeignmemory.h
+++ b/tools/libs/foreignmemory/include/xenforeignmemory.h
@@ -138,6 +138,47 @@ int xenforeignmemory_unmap(xenforeignmemory_handle *fmem,
int xenforeignmemory_restrict(xenforeignmemory_handle *fmem,
domid_t domid);
+typedef struct xenforeignmemory_resource_handle xenforeignmemory_resource_handle;
+
+/**
+ * This function maps a guest resource.
+ *
+ * @parm fmem handle to the open foreignmemory interface
+ * @parm domid the domain id
+ * @parm type the resource type
+ * @parm id the type-specific resource identifier
+ * @parm frame base frame index within the resource
+ * @parm nr_frames number of frames to map
+ * @parm paddr pointer to an address passed through to mmap(2)
+ * @parm prot passed through to mmap(2)
+ * @parm POSIX-only flags passed through to mmap(2)
+ * @return pointer to foreignmemory resource handle on success, NULL on
+ * failure
+ *
+ * *paddr is used, on entry, as a hint address for foreign map placement
+ * (see mmap(2)) so should be set to NULL if no specific placement is
+ * required. On return *paddr contains the address where the resource is
+ * mapped.
+ * As for xenforeignmemory_map2() flags is a set of additional flags
+ * for mmap(2). Not all of the flag combinations are possible due to
+ * implementation details on different platforms.
+ */
+xenforeignmemory_resource_handle *xenforeignmemory_map_resource(
+ xenforeignmemory_handle *fmem, domid_t domid, unsigned int type,
+ unsigned int id, unsigned long frame, unsigned long nr_frames,
+ void **paddr, int prot, int flags);
+
+/**
+ * This function releases a previously acquired resource.
+ *
+ * @parm fmem handle to the open foreignmemory interface
+ * @parm fres handle to the acquired resource
+ *
+ * Returns 0 on success on failure sets errno and returns -1.
+ */
+int xenforeignmemory_unmap_resource(
+ xenforeignmemory_handle *fmem, xenforeignmemory_resource_handle *fres);
+
#endif
/*
diff --git a/tools/libs/foreignmemory/libxenforeignmemory.map b/tools/libs/foreignmemory/libxenforeignmemory.map
index 716ecaf15c..d5323c87d9 100644
--- a/tools/libs/foreignmemory/libxenforeignmemory.map
+++ b/tools/libs/foreignmemory/libxenforeignmemory.map
@@ -14,3 +14,8 @@ VERS_1.2 {
global:
xenforeignmemory_map2;
} VERS_1.1;
+VERS_1.3 {
+ global:
+ xenforeignmemory_map_resource;
+ xenforeignmemory_unmap_resource;
+} VERS_1.2;
diff --git a/tools/libs/foreignmemory/linux.c b/tools/libs/foreignmemory/linux.c
index 374e45aed5..a6b41b0b7f 100644
--- a/tools/libs/foreignmemory/linux.c
+++ b/tools/libs/foreignmemory/linux.c
@@ -277,6 +277,51 @@ int osdep_xenforeignmemory_restrict(xenforeignmemory_handle *fmem,
return ioctl(fmem->fd, IOCTL_PRIVCMD_RESTRICT, &domid);
}
+int osdep_xenforeignmemory_unmap_resource(
+ xenforeignmemory_handle *fmem, xenforeignmemory_resource_handle *fres)
+{
+ return munmap(fres->addr, fres->nr_frames << PAGE_SHIFT);
+}
+
+int osdep_xenforeignmemory_map_resource(
+ xenforeignmemory_handle *fmem, xenforeignmemory_resource_handle *fres)
+{
+ privcmd_mmap_resource_t mr = {
+ .dom = fres->domid,
+ .type = fres->type,
+ .id = fres->id,
+ .idx = fres->frame,
+ .num = fres->nr_frames,
+ };
+ int rc;
+
+ fres->addr = mmap(fres->addr, fres->nr_frames << PAGE_SHIFT,
+ fres->prot, fres->flags | MAP_SHARED, fmem->fd, 0);
+ if ( fres->addr == MAP_FAILED )
+ return -1;
+
+ mr.addr = (uintptr_t)fres->addr;
+
+ rc = ioctl(fmem->fd, IOCTL_PRIVCMD_MMAP_RESOURCE, &mr);
+ if ( rc )
+ {
+ int saved_errno;
+
+ if ( errno != ENOTTY )
+ PERROR("ioctl failed");
+ else
+ errno = EOPNOTSUPP;
+
+ saved_errno = errno;
+ (void)osdep_xenforeignmemory_unmap_resource(fmem, fres);
+ errno = saved_errno;
+
+ return -1;
+ }
+
+ return 0;
+}
+
/*
* Local variables:
* mode: C
diff --git a/tools/libs/foreignmemory/private.h b/tools/libs/foreignmemory/private.h
index c5c07cc4c4..80b22bdbfc 100644
--- a/tools/libs/foreignmemory/private.h
+++ b/tools/libs/foreignmemory/private.h
@@ -42,6 +42,37 @@ void *compat_mapforeign_batch(xenforeignmem_handle *fmem, uint32_t dom,
xen_pfn_t *arr, int num);
#endif
+struct xenforeignmemory_resource_handle {
+ domid_t domid;
+ unsigned int type;
+ unsigned int id;
+ unsigned long frame;
+ unsigned long nr_frames;
+ void *addr;
+ int prot;
+ int flags;
+};
+
+#ifndef __linux__
+static inline int osdep_xenforeignmemory_map_resource(
+ xenforeignmemory_handle *fmem, xenforeignmemory_resource_handle *fres)
+{
+ errno = EOPNOTSUPP;
+ return -1;
+}
+
+static inline int osdep_xenforeignmemory_unmap_resource(
+ xenforeignmemory_handle *fmem, xenforeignmemory_resource_handle *fres)
+{
+ return 0;
+}
+#else
+int osdep_xenforeignmemory_map_resource(
+ xenforeignmemory_handle *fmem, xenforeignmemory_resource_handle *fres);
+int osdep_xenforeignmemory_unmap_resource(
+ xenforeignmemory_handle *fmem, xenforeignmemory_resource_handle *fres);
+#endif
+
#define PERROR(_f...) \
xtl_log(fmem->logger, XTL_ERROR, errno, "xenforeignmemory", _f)
--
2.11.0
_______________________________________________
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Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v8 09/11] tools/libxenforeignmemory: reduce xenforeignmemory_restrict code footprint
2017-09-29 14:51 [PATCH v8 00/11] x86: guest resource mapping Paul Durrant
` (7 preceding siblings ...)
2017-09-29 14:51 ` [PATCH v8 08/11] tools/libxenforeignmemory: add support for resource mapping Paul Durrant
@ 2017-09-29 14:51 ` Paul Durrant
2017-09-29 14:51 ` [PATCH v8 10/11] common: add a new mappable resource type: XENMEM_resource_grant_table Paul Durrant
2017-09-29 14:51 ` [PATCH v8 11/11] tools/libxenctrl: use new xenforeignmemory API to seed grant table Paul Durrant
10 siblings, 0 replies; 17+ messages in thread
From: Paul Durrant @ 2017-09-29 14:51 UTC (permalink / raw)
To: xen-devel; +Cc: Paul Durrant, Ian Jackson
By using a static inline stub in private.h for OS where this functionality
is not implemented, the various duplicate stubs in the OS-specific source
modules can be avoided.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
v4:
- Removed extraneous freebsd code.
v3:
- Patch added in response to review comments.
---
tools/libs/foreignmemory/freebsd.c | 7 -------
tools/libs/foreignmemory/minios.c | 7 -------
tools/libs/foreignmemory/netbsd.c | 7 -------
tools/libs/foreignmemory/private.h | 12 +++++++++---
tools/libs/foreignmemory/solaris.c | 7 -------
5 files changed, 9 insertions(+), 31 deletions(-)
diff --git a/tools/libs/foreignmemory/freebsd.c b/tools/libs/foreignmemory/freebsd.c
index dec447485a..6e6bc4b11f 100644
--- a/tools/libs/foreignmemory/freebsd.c
+++ b/tools/libs/foreignmemory/freebsd.c
@@ -95,13 +95,6 @@ int osdep_xenforeignmemory_unmap(xenforeignmemory_handle *fmem,
return munmap(addr, num << PAGE_SHIFT);
}
-int osdep_xenforeignmemory_restrict(xenforeignmemory_handle *fmem,
- domid_t domid)
-{
- errno = -EOPNOTSUPP;
- return -1;
-}
-
/*
* Local variables:
* mode: C
diff --git a/tools/libs/foreignmemory/minios.c b/tools/libs/foreignmemory/minios.c
index 75f340122e..43341ca301 100644
--- a/tools/libs/foreignmemory/minios.c
+++ b/tools/libs/foreignmemory/minios.c
@@ -58,13 +58,6 @@ int osdep_xenforeignmemory_unmap(xenforeignmemory_handle *fmem,
return munmap(addr, num << PAGE_SHIFT);
}
-int osdep_xenforeignmemory_restrict(xenforeignmemory_handle *fmem,
- domid_t domid)
-{
- errno = -EOPNOTSUPP;
- return -1;
-}
-
/*
* Local variables:
* mode: C
diff --git a/tools/libs/foreignmemory/netbsd.c b/tools/libs/foreignmemory/netbsd.c
index 9bf95ef4f0..54a418ebd6 100644
--- a/tools/libs/foreignmemory/netbsd.c
+++ b/tools/libs/foreignmemory/netbsd.c
@@ -100,13 +100,6 @@ int osdep_xenforeignmemory_unmap(xenforeignmemory_handle *fmem,
return munmap(addr, num*XC_PAGE_SIZE);
}
-int osdep_xenforeignmemory_restrict(xenforeignmemory_handle *fmem,
- domid_t domid)
-{
- errno = -EOPNOTSUPP;
- return -1;
-}
-
/*
* Local variables:
* mode: C
diff --git a/tools/libs/foreignmemory/private.h b/tools/libs/foreignmemory/private.h
index 80b22bdbfc..b5d5f0a354 100644
--- a/tools/libs/foreignmemory/private.h
+++ b/tools/libs/foreignmemory/private.h
@@ -32,9 +32,6 @@ void *osdep_xenforeignmemory_map(xenforeignmemory_handle *fmem,
int osdep_xenforeignmemory_unmap(xenforeignmemory_handle *fmem,
void *addr, size_t num);
-int osdep_xenforeignmemory_restrict(xenforeignmemory_handle *fmem,
- domid_t domid);
-
#if defined(__NetBSD__) || defined(__sun__)
/* Strictly compat for those two only only */
void *compat_mapforeign_batch(xenforeignmem_handle *fmem, uint32_t dom,
@@ -54,6 +51,13 @@ struct xenforeignmemory_resource_handle {
};
#ifndef __linux__
+static inline int osdep_xenforeignmemory_restrict(xenforeignmemory_handle *fmem,
+ domid_t domid)
+{
+ errno = EOPNOTSUPP;
+ return -1;
+}
+
static inline int osdep_xenforeignmemory_map_resource(
xenforeignmemory_handle *fmem, xenforeignmemory_resource_handle *fres)
{
@@ -67,6 +71,8 @@ static inline int osdep_xenforeignmemory_unmap_resource(
return 0;
}
#else
+int osdep_xenforeignmemory_restrict(xenforeignmemory_handle *fmem,
+ domid_t domid);
int osdep_xenforeignmemory_map_resource(
xenforeignmemory_handle *fmem, xenforeignmemory_resource_handle *fres);
int osdep_xenforeignmemory_unmap_resource(
diff --git a/tools/libs/foreignmemory/solaris.c b/tools/libs/foreignmemory/solaris.c
index a33decb4ae..ee8aae4fbd 100644
--- a/tools/libs/foreignmemory/solaris.c
+++ b/tools/libs/foreignmemory/solaris.c
@@ -97,13 +97,6 @@ int osdep_xenforeignmemory_unmap(xenforeignmemory_handle *fmem,
return munmap(addr, num*XC_PAGE_SIZE);
}
-int osdep_xenforeignmemory_restrict(xenforeignmemory_handle *fmem,
- domid_t domid)
-{
- errno = -EOPNOTSUPP;
- return -1;
-}
-
/*
* Local variables:
* mode: C
--
2.11.0
_______________________________________________
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Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v8 10/11] common: add a new mappable resource type: XENMEM_resource_grant_table
2017-09-29 14:51 [PATCH v8 00/11] x86: guest resource mapping Paul Durrant
` (8 preceding siblings ...)
2017-09-29 14:51 ` [PATCH v8 09/11] tools/libxenforeignmemory: reduce xenforeignmemory_restrict code footprint Paul Durrant
@ 2017-09-29 14:51 ` Paul Durrant
2017-09-29 14:51 ` [PATCH v8 11/11] tools/libxenctrl: use new xenforeignmemory API to seed grant table Paul Durrant
10 siblings, 0 replies; 17+ messages in thread
From: Paul Durrant @ 2017-09-29 14:51 UTC (permalink / raw)
To: xen-devel
Cc: Stefano Stabellini, Wei Liu, George Dunlap, Andrew Cooper,
Ian Jackson, Tim Deegan, Paul Durrant, Jan Beulich
This patch allows grant table frames to be mapped using the
XENMEM_acquire_resource memory op.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
---
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: George Dunlap <George.Dunlap@eu.citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Tim Deegan <tim@xen.org>
Cc: Wei Liu <wei.liu2@citrix.com>
v8:
- The functionality was originally incorporated into the earlier patch
"x86/mm: add HYPERVISOR_memory_op to acquire guest resources".
---
xen/common/grant_table.c | 32 ++++++++++++++++++++++++++++----
xen/common/memory.c | 30 ++++++++++++++++++++++++++++++
xen/include/public/memory.h | 5 +++++
xen/include/xen/grant_table.h | 1 +
4 files changed, 64 insertions(+), 4 deletions(-)
diff --git a/xen/common/grant_table.c b/xen/common/grant_table.c
index 71706f5cba..0530cf63c9 100644
--- a/xen/common/grant_table.c
+++ b/xen/common/grant_table.c
@@ -3720,14 +3720,13 @@ int mem_sharing_gref_to_gfn(struct grant_table *gt, grant_ref_t ref,
}
#endif
-int gnttab_map_frame(struct domain *d, unsigned long idx, gfn_t gfn,
- mfn_t *mfn)
+/* Caller must hold write lock as version may change and table may grow */
+static int gnttab_get_frame_locked(struct domain *d, unsigned long idx,
+ mfn_t *mfn)
{
int rc = 0;
struct grant_table *gt = d->grant_table;
- grant_write_lock(gt);
-
if ( gt->gt_version == 0 )
gt->gt_version = 1;
@@ -3751,6 +3750,19 @@ int gnttab_map_frame(struct domain *d, unsigned long idx, gfn_t gfn,
rc = -EINVAL;
}
+ return rc;
+}
+
+int gnttab_map_frame(struct domain *d, unsigned long idx, gfn_t gfn,
+ mfn_t *mfn)
+{
+ struct grant_table *gt = d->grant_table;
+ int rc;
+
+ grant_write_lock(gt);
+
+ rc = gnttab_get_frame_locked(d, idx, mfn);
+
if ( !rc )
gnttab_set_frame_gfn(gt, idx, gfn);
@@ -3759,6 +3771,18 @@ int gnttab_map_frame(struct domain *d, unsigned long idx, gfn_t gfn,
return rc;
}
+int gnttab_get_frame(struct domain *d, unsigned long idx, mfn_t *mfn)
+{
+ struct grant_table *gt = d->grant_table;
+ int rc;
+
+ grant_write_lock(gt); /* write lock is required as table may grow */
+ rc = gnttab_get_frame_locked(d, idx, mfn);
+ grant_write_unlock(gt);
+
+ return rc;
+}
+
static void gnttab_usage_print(struct domain *rd)
{
int first = 1;
diff --git a/xen/common/memory.c b/xen/common/memory.c
index a068877cf6..fb14f79218 100644
--- a/xen/common/memory.c
+++ b/xen/common/memory.c
@@ -23,6 +23,7 @@
#include <xen/numa.h>
#include <xen/mem_access.h>
#include <xen/trace.h>
+#include <xen/grant_table.h>
#include <asm/current.h>
#include <asm/hardirq.h>
#include <asm/p2m.h>
@@ -965,6 +966,30 @@ static long xatp_permission_check(struct domain *d, unsigned int space)
}
#ifdef CONFIG_X86
+static int acquire_grant_table(struct domain *d, unsigned int id,
+ unsigned long frame,
+ unsigned long nr_frames,
+ unsigned long mfn_list[])
+{
+ unsigned int i = nr_frames;
+
+ if ( id != 0 )
+ return -EINVAL;
+
+ while ( i-- != 0 )
+ {
+ mfn_t mfn = INVALID_MFN;
+ int rc = gnttab_get_frame(d, frame + i, &mfn);
+
+ if ( rc )
+ return rc;
+
+ mfn_list[i] = mfn_x(mfn);
+ }
+
+ return 0;
+}
+
static int acquire_resource(const xen_mem_acquire_resource_t *xmar)
{
struct domain *d, *currd = current->domain;
@@ -992,6 +1017,11 @@ static int acquire_resource(const xen_mem_acquire_resource_t *xmar)
xmar->nr_frames, mfn_list);
break;
+ case XENMEM_resource_grant_table:
+ rc = acquire_grant_table(d, xmar->id, xmar->frame,
+ xmar->nr_frames, mfn_list);
+ break;
+
default:
rc = -EOPNOTSUPP;
break;
diff --git a/xen/include/public/memory.h b/xen/include/public/memory.h
index e30a4d9794..2099b09cf5 100644
--- a/xen/include/public/memory.h
+++ b/xen/include/public/memory.h
@@ -611,6 +611,7 @@ struct xen_mem_acquire_resource {
uint16_t type;
#define XENMEM_resource_ioreq_server 0
+#define XENMEM_resource_grant_table 1
/*
* IN - a type-specific resource identifier, which must be zero
@@ -628,6 +629,10 @@ struct xen_mem_acquire_resource {
* page
* frame == 1 -> ioreq
* page
+ * type == XENMEM_resource_grant_table -> frame has same semantics
+ * as idx passed to
+ * XENMEM_add_to_physmap for
+ * XENMAPSPACE_grant_table.
*/
uint64_aligned_t frame;
/* IN/OUT - If the tools domain is PV then, upon return, gmfn_list
diff --git a/xen/include/xen/grant_table.h b/xen/include/xen/grant_table.h
index d2bd2416c4..15a83df215 100644
--- a/xen/include/xen/grant_table.h
+++ b/xen/include/xen/grant_table.h
@@ -58,5 +58,6 @@ int mem_sharing_gref_to_gfn(struct grant_table *gt, grant_ref_t ref,
int gnttab_map_frame(struct domain *d, unsigned long idx, gfn_t gfn,
mfn_t *mfn);
+int gnttab_get_frame(struct domain *d, unsigned long idx, mfn_t *mfn);
#endif /* __XEN_GRANT_TABLE_H__ */
--
2.11.0
_______________________________________________
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^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH v8 11/11] tools/libxenctrl: use new xenforeignmemory API to seed grant table
2017-09-29 14:51 [PATCH v8 00/11] x86: guest resource mapping Paul Durrant
` (9 preceding siblings ...)
2017-09-29 14:51 ` [PATCH v8 10/11] common: add a new mappable resource type: XENMEM_resource_grant_table Paul Durrant
@ 2017-09-29 14:51 ` Paul Durrant
10 siblings, 0 replies; 17+ messages in thread
From: Paul Durrant @ 2017-09-29 14:51 UTC (permalink / raw)
To: xen-devel; +Cc: Paul Durrant, Ian Jackson
A previous patch added support for priv-mapping guest resources directly
(rather than having to foreign-map, which requires P2M modification for
HVM guests).
This patch makes use of the new API to seed the guest grant table unless
the underlying infrastructure (i.e. privcmd) doesn't support it, in which
case the old scheme is used.
NOTE: The call to xc_dom_gnttab_hvm_seed() in hvm_build_set_params() was
actually unnecessary, as the grant table has already been seeded
by a prior call to xc_dom_gnttab_init() made by libxl__build_dom().
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Acked-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
v4:
- Minor cosmetic fix suggested by Roger.
v3:
- Introduced xc_dom_set_gnttab_entry() to avoid duplicated code.
---
tools/libxc/include/xc_dom.h | 8 +--
tools/libxc/xc_dom_boot.c | 114 +++++++++++++++++++++++++-----------
tools/libxc/xc_sr_restore_x86_hvm.c | 10 ++--
tools/libxc/xc_sr_restore_x86_pv.c | 2 +-
tools/libxl/libxl_dom.c | 1 -
tools/python/xen/lowlevel/xc/xc.c | 6 +-
6 files changed, 92 insertions(+), 49 deletions(-)
diff --git a/tools/libxc/include/xc_dom.h b/tools/libxc/include/xc_dom.h
index ce47058c41..d6ca0a8680 100644
--- a/tools/libxc/include/xc_dom.h
+++ b/tools/libxc/include/xc_dom.h
@@ -323,12 +323,8 @@ void *xc_dom_boot_domU_map(struct xc_dom_image *dom, xen_pfn_t pfn,
int xc_dom_boot_image(struct xc_dom_image *dom);
int xc_dom_compat_check(struct xc_dom_image *dom);
int xc_dom_gnttab_init(struct xc_dom_image *dom);
-int xc_dom_gnttab_hvm_seed(xc_interface *xch, domid_t domid,
- xen_pfn_t console_gmfn,
- xen_pfn_t xenstore_gmfn,
- domid_t console_domid,
- domid_t xenstore_domid);
-int xc_dom_gnttab_seed(xc_interface *xch, domid_t domid,
+int xc_dom_gnttab_seed(xc_interface *xch, domid_t guest_domid,
+ bool is_hvm,
xen_pfn_t console_gmfn,
xen_pfn_t xenstore_gmfn,
domid_t console_domid,
diff --git a/tools/libxc/xc_dom_boot.c b/tools/libxc/xc_dom_boot.c
index c3b44dd399..dc0a1fdee8 100644
--- a/tools/libxc/xc_dom_boot.c
+++ b/tools/libxc/xc_dom_boot.c
@@ -280,11 +280,29 @@ static xen_pfn_t xc_dom_gnttab_setup(xc_interface *xch, domid_t domid)
return gmfn;
}
-int xc_dom_gnttab_seed(xc_interface *xch, domid_t domid,
- xen_pfn_t console_gmfn,
- xen_pfn_t xenstore_gmfn,
- domid_t console_domid,
- domid_t xenstore_domid)
+static void xc_dom_set_gnttab_entry(xc_interface *xch,
+ grant_entry_v1_t *gnttab,
+ unsigned int idx,
+ domid_t guest_domid,
+ domid_t backend_domid,
+ xen_pfn_t backend_gmfn)
+{
+ if ( guest_domid == backend_domid || backend_gmfn == -1)
+ return;
+
+ xc_dom_printf(xch, "%s: [%u] -> 0x%"PRI_xen_pfn,
+ __FUNCTION__, idx, backend_gmfn);
+
+ gnttab[idx].flags = GTF_permit_access;
+ gnttab[idx].domid = backend_domid;
+ gnttab[idx].frame = backend_gmfn;
+}
+
+static int compat_gnttab_seed(xc_interface *xch, domid_t domid,
+ xen_pfn_t console_gmfn,
+ xen_pfn_t xenstore_gmfn,
+ domid_t console_domid,
+ domid_t xenstore_domid)
{
xen_pfn_t gnttab_gmfn;
@@ -308,18 +326,10 @@ int xc_dom_gnttab_seed(xc_interface *xch, domid_t domid,
return -1;
}
- if ( domid != console_domid && console_gmfn != -1)
- {
- gnttab[GNTTAB_RESERVED_CONSOLE].flags = GTF_permit_access;
- gnttab[GNTTAB_RESERVED_CONSOLE].domid = console_domid;
- gnttab[GNTTAB_RESERVED_CONSOLE].frame = console_gmfn;
- }
- if ( domid != xenstore_domid && xenstore_gmfn != -1)
- {
- gnttab[GNTTAB_RESERVED_XENSTORE].flags = GTF_permit_access;
- gnttab[GNTTAB_RESERVED_XENSTORE].domid = xenstore_domid;
- gnttab[GNTTAB_RESERVED_XENSTORE].frame = xenstore_gmfn;
- }
+ xc_dom_set_gnttab_entry(xch, gnttab, GNTTAB_RESERVED_CONSOLE,
+ domid, console_domid, console_gmfn);
+ xc_dom_set_gnttab_entry(xch, gnttab, GNTTAB_RESERVED_XENSTORE,
+ domid, xenstore_domid, xenstore_gmfn);
if ( munmap(gnttab, PAGE_SIZE) == -1 )
{
@@ -337,11 +347,11 @@ int xc_dom_gnttab_seed(xc_interface *xch, domid_t domid,
return 0;
}
-int xc_dom_gnttab_hvm_seed(xc_interface *xch, domid_t domid,
- xen_pfn_t console_gpfn,
- xen_pfn_t xenstore_gpfn,
- domid_t console_domid,
- domid_t xenstore_domid)
+static int compat_gnttab_hvm_seed(xc_interface *xch, domid_t domid,
+ xen_pfn_t console_gpfn,
+ xen_pfn_t xenstore_gpfn,
+ domid_t console_domid,
+ domid_t xenstore_domid)
{
int rc;
xen_pfn_t scratch_gpfn;
@@ -380,7 +390,7 @@ int xc_dom_gnttab_hvm_seed(xc_interface *xch, domid_t domid,
return -1;
}
- rc = xc_dom_gnttab_seed(xch, domid,
+ rc = compat_gnttab_seed(xch, domid,
console_gpfn, xenstore_gpfn,
console_domid, xenstore_domid);
if (rc != 0)
@@ -405,18 +415,56 @@ int xc_dom_gnttab_hvm_seed(xc_interface *xch, domid_t domid,
return 0;
}
-int xc_dom_gnttab_init(struct xc_dom_image *dom)
+int xc_dom_gnttab_seed(xc_interface *xch, domid_t guest_domid,
+ bool is_hvm, xen_pfn_t console_gmfn,
+ xen_pfn_t xenstore_gmfn, domid_t console_domid,
+ domid_t xenstore_domid)
{
- if ( xc_dom_translated(dom) ) {
- return xc_dom_gnttab_hvm_seed(dom->xch, dom->guest_domid,
- dom->console_pfn, dom->xenstore_pfn,
- dom->console_domid, dom->xenstore_domid);
- } else {
- return xc_dom_gnttab_seed(dom->xch, dom->guest_domid,
- xc_dom_p2m(dom, dom->console_pfn),
- xc_dom_p2m(dom, dom->xenstore_pfn),
- dom->console_domid, dom->xenstore_domid);
+ xenforeignmemory_handle* fmem = xch->fmem;
+ xenforeignmemory_resource_handle *fres;
+ void *addr = NULL;
+
+ fres = xenforeignmemory_map_resource(fmem, guest_domid,
+ XENMEM_resource_grant_table,
+ 0, 0, 1,
+ &addr, PROT_READ | PROT_WRITE, 0);
+ if ( !fres )
+ {
+ if ( errno == EOPNOTSUPP )
+ return is_hvm ?
+ compat_gnttab_hvm_seed(xch, guest_domid,
+ console_gmfn, xenstore_gmfn,
+ console_domid, xenstore_domid) :
+ compat_gnttab_seed(xch, guest_domid,
+ console_gmfn, xenstore_gmfn,
+ console_domid, xenstore_domid);
+
+ xc_dom_panic(xch, XC_INTERNAL_ERROR,
+ "%s: failed to acquire grant table "
+ "[errno=%d]\n",
+ __FUNCTION__, errno);
+ return -1;
}
+
+ xc_dom_set_gnttab_entry(xch, addr, GNTTAB_RESERVED_CONSOLE,
+ guest_domid, console_domid, console_gmfn);
+ xc_dom_set_gnttab_entry(xch, addr, GNTTAB_RESERVED_XENSTORE,
+ guest_domid, xenstore_domid, xenstore_gmfn);
+
+ xenforeignmemory_unmap_resource(fmem, fres);
+
+ return 0;
+}
+
+int xc_dom_gnttab_init(struct xc_dom_image *dom)
+{
+ bool is_hvm = xc_dom_translated(dom);
+ xen_pfn_t console_gmfn = xc_dom_p2m(dom, dom->console_pfn);
+ xen_pfn_t xenstore_gmfn = xc_dom_p2m(dom, dom->xenstore_pfn);
+
+ return xc_dom_gnttab_seed(dom->xch, dom->guest_domid, is_hvm,
+ console_gmfn, xenstore_gmfn,
+ dom->console_domid, dom->xenstore_domid);
}
/*
diff --git a/tools/libxc/xc_sr_restore_x86_hvm.c b/tools/libxc/xc_sr_restore_x86_hvm.c
index 1dca85354a..a5c661da8f 100644
--- a/tools/libxc/xc_sr_restore_x86_hvm.c
+++ b/tools/libxc/xc_sr_restore_x86_hvm.c
@@ -207,11 +207,11 @@ static int x86_hvm_stream_complete(struct xc_sr_context *ctx)
return rc;
}
- rc = xc_dom_gnttab_hvm_seed(xch, ctx->domid,
- ctx->restore.console_gfn,
- ctx->restore.xenstore_gfn,
- ctx->restore.console_domid,
- ctx->restore.xenstore_domid);
+ rc = xc_dom_gnttab_seed(xch, ctx->domid, true,
+ ctx->restore.console_gfn,
+ ctx->restore.xenstore_gfn,
+ ctx->restore.console_domid,
+ ctx->restore.xenstore_domid);
if ( rc )
{
PERROR("Failed to seed grant table");
diff --git a/tools/libxc/xc_sr_restore_x86_pv.c b/tools/libxc/xc_sr_restore_x86_pv.c
index 50e25c162c..10635d436b 100644
--- a/tools/libxc/xc_sr_restore_x86_pv.c
+++ b/tools/libxc/xc_sr_restore_x86_pv.c
@@ -1104,7 +1104,7 @@ static int x86_pv_stream_complete(struct xc_sr_context *ctx)
if ( rc )
return rc;
- rc = xc_dom_gnttab_seed(xch, ctx->domid,
+ rc = xc_dom_gnttab_seed(xch, ctx->domid, false,
ctx->restore.console_gfn,
ctx->restore.xenstore_gfn,
ctx->restore.console_domid,
diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index b420738adf..7e5cc2b16a 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -857,7 +857,6 @@ static int hvm_build_set_params(xc_interface *handle, uint32_t domid,
*store_mfn = str_mfn;
*console_mfn = cons_mfn;
- xc_dom_gnttab_hvm_seed(handle, domid, *console_mfn, *store_mfn, console_domid, store_domid);
return 0;
}
diff --git a/tools/python/xen/lowlevel/xc/xc.c b/tools/python/xen/lowlevel/xc/xc.c
index f501764100..51dc2afb1e 100644
--- a/tools/python/xen/lowlevel/xc/xc.c
+++ b/tools/python/xen/lowlevel/xc/xc.c
@@ -800,9 +800,9 @@ static PyObject *pyxc_gnttab_hvm_seed(XcObject *self,
&console_domid, &xenstore_domid) )
return NULL;
- if ( xc_dom_gnttab_hvm_seed(self->xc_handle, dom,
- console_gmfn, xenstore_gmfn,
- console_domid, xenstore_domid) != 0 )
+ if ( xc_dom_gnttab_seed(self->xc_handle, dom, true,
+ console_gmfn, xenstore_gmfn,
+ console_domid, xenstore_domid) != 0 )
return pyxc_error_to_exception(self->xc_handle);
return Py_None;
--
2.11.0
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^ permalink raw reply related [flat|nested] 17+ messages in thread
* Re: [PATCH v8 01/11] x86/hvm/ioreq: maintain an array of ioreq servers rather than a list
2017-09-29 14:51 ` [PATCH v8 01/11] x86/hvm/ioreq: maintain an array of ioreq servers rather than a list Paul Durrant
@ 2017-09-29 15:35 ` Andrew Cooper
2017-09-29 15:38 ` Paul Durrant
0 siblings, 1 reply; 17+ messages in thread
From: Andrew Cooper @ 2017-09-29 15:35 UTC (permalink / raw)
To: Paul Durrant, xen-devel; +Cc: Jan Beulich
On 29/09/17 15:51, Paul Durrant wrote:
> A subsequent patch will remove the current implicit limitation on creation
> of ioreq servers which is due to the allocation of gfns for the ioreq
> structures and buffered ioreq ring.
>
> It will therefore be necessary to introduce an explicit limit and, since
> this limit should be small, it simplifies the code to maintain an array of
> that size rather than using a list.
>
> Also, by reserving an array slot for the default server and populating
> array slots early in create, the need to pass an 'is_default' boolean
> to sub-functions can be avoided.
>
> Some function return values are changed by this patch: Specifically, in
> the case where the id of the default ioreq server is passed in, -EOPNOTSUPP
> is now returned rather than -ENOENT.
>
> Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
> Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
> ---
> Cc: Jan Beulich <jbeulich@suse.com>
> Cc: Andrew Cooper <andrew.cooper3@citrix.com>
>
> v8:
> - Addressed various comments from Jan.
>
> v7:
> - Fixed assertion failure found in testing.
>
> v6:
> - Updated according to comments made by Roger on v4 that I'd missed.
>
> v5:
> - Switched GET/SET_IOREQ_SERVER() macros to get/set_ioreq_server()
> functions to avoid possible double-evaluation issues.
>
> v4:
> - Introduced more helper macros and relocated them to the top of the
> code.
>
> v3:
> - New patch (replacing "move is_default into struct hvm_ioreq_server") in
> response to review comments.
> ---
> xen/arch/x86/hvm/ioreq.c | 525 ++++++++++++++++++++-------------------
> xen/include/asm-x86/hvm/domain.h | 10 +-
> 2 files changed, 270 insertions(+), 265 deletions(-)
>
> diff --git a/xen/arch/x86/hvm/ioreq.c b/xen/arch/x86/hvm/ioreq.c
> index f2e0b3f74a..e655d2eab3 100644
> --- a/xen/arch/x86/hvm/ioreq.c
> +++ b/xen/arch/x86/hvm/ioreq.c
> @@ -33,6 +33,41 @@
>
> #include <public/hvm/ioreq.h>
>
> +static void set_ioreq_server(struct domain *d, unsigned int id,
> + struct hvm_ioreq_server *s)
> +{
> + ASSERT(id < MAX_NR_IOREQ_SERVERS);
> + ASSERT(!s || !d->arch.hvm_domain.ioreq_server.server[id]);
> +
> + d->arch.hvm_domain.ioreq_server.server[id] = s;
> +}
> +
> +#define GET_IOREQ_SERVER(d, id) \
> + (d)->arch.hvm_domain.ioreq_server.server[id]
> +
> +static struct hvm_ioreq_server *get_ioreq_server(const struct domain *d,
> + unsigned int id)
> +{
> + if ( id >= MAX_NR_IOREQ_SERVERS )
> + return NULL;
> +
> + return GET_IOREQ_SERVER(d, id);
> +}
> +
> +#define IS_DEFAULT(s) \
> + ((s) == get_ioreq_server((s)->domain, DEFAULT_IOSERVID))
> +
> +/*
> + * Iterate over all possible ioreq servers. The use of inline function
> + * get_ioreq_server() in the increment is deliberate as use of the
> + * GET_IOREQ_SERVER() macro will cause gcc to complain about an array
> + * overflow.
> + */
> +#define FOR_EACH_IOREQ_SERVER(d, id, s) \
> + for ( (id) = 0, (s) = GET_IOREQ_SERVER(d, 0); \
> + (id) < MAX_NR_IOREQ_SERVERS; \
> + (s) = get_ioreq_server(d, ++(id)) )
I'm guessing from the various constructs, the list of ioreq servers
might have embedded NULLs in the middle?
If so, how about this?
#define FOR_EACH_IOREQ_SERVER(d, id, s) \
for ( (id) = 0, (s) = GET_IOREQ_SERVER(d, 0); \
(id) < MAX_NR_IOREQ_SERVERS; \
(s) = get_ioreq_server(d, ++(id)) ) \
if ( !s ) \
continue; \
else
Every single use of this loop has the continue clause, which will go
subtly wrong if someone typos continue as break. This construct will
work correctly with or without braces in the main body of code.
(For very brave people, https://www.chiark.greenend.org.uk/~sgtatham/mp/
is an interesting read for quite what is possible by taking the above to
extremes.)
Beyond that, why is GET_IOREQ_SERVER() needed? All it appears to do is
complicate code which could perfectly easily use get_ioreq_server().
~Andrew
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^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH v8 01/11] x86/hvm/ioreq: maintain an array of ioreq servers rather than a list
2017-09-29 15:35 ` Andrew Cooper
@ 2017-09-29 15:38 ` Paul Durrant
2017-10-04 10:16 ` Jan Beulich
0 siblings, 1 reply; 17+ messages in thread
From: Paul Durrant @ 2017-09-29 15:38 UTC (permalink / raw)
To: Andrew Cooper, xen-devel; +Cc: Jan Beulich
> -----Original Message-----
> From: Andrew Cooper
> Sent: 29 September 2017 16:35
> To: Paul Durrant <Paul.Durrant@citrix.com>; xen-devel@lists.xenproject.org
> Cc: Jan Beulich <jbeulich@suse.com>
> Subject: Re: [PATCH v8 01/11] x86/hvm/ioreq: maintain an array of ioreq
> servers rather than a list
>
> On 29/09/17 15:51, Paul Durrant wrote:
> > A subsequent patch will remove the current implicit limitation on creation
> > of ioreq servers which is due to the allocation of gfns for the ioreq
> > structures and buffered ioreq ring.
> >
> > It will therefore be necessary to introduce an explicit limit and, since
> > this limit should be small, it simplifies the code to maintain an array of
> > that size rather than using a list.
> >
> > Also, by reserving an array slot for the default server and populating
> > array slots early in create, the need to pass an 'is_default' boolean
> > to sub-functions can be avoided.
> >
> > Some function return values are changed by this patch: Specifically, in
> > the case where the id of the default ioreq server is passed in, -
> EOPNOTSUPP
> > is now returned rather than -ENOENT.
> >
> > Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
> > Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
> > ---
> > Cc: Jan Beulich <jbeulich@suse.com>
> > Cc: Andrew Cooper <andrew.cooper3@citrix.com>
> >
> > v8:
> > - Addressed various comments from Jan.
> >
> > v7:
> > - Fixed assertion failure found in testing.
> >
> > v6:
> > - Updated according to comments made by Roger on v4 that I'd missed.
> >
> > v5:
> > - Switched GET/SET_IOREQ_SERVER() macros to get/set_ioreq_server()
> > functions to avoid possible double-evaluation issues.
> >
> > v4:
> > - Introduced more helper macros and relocated them to the top of the
> > code.
> >
> > v3:
> > - New patch (replacing "move is_default into struct hvm_ioreq_server") in
> > response to review comments.
> > ---
> > xen/arch/x86/hvm/ioreq.c | 525 ++++++++++++++++++++--------------
> -----
> > xen/include/asm-x86/hvm/domain.h | 10 +-
> > 2 files changed, 270 insertions(+), 265 deletions(-)
> >
> > diff --git a/xen/arch/x86/hvm/ioreq.c b/xen/arch/x86/hvm/ioreq.c
> > index f2e0b3f74a..e655d2eab3 100644
> > --- a/xen/arch/x86/hvm/ioreq.c
> > +++ b/xen/arch/x86/hvm/ioreq.c
> > @@ -33,6 +33,41 @@
> >
> > #include <public/hvm/ioreq.h>
> >
> > +static void set_ioreq_server(struct domain *d, unsigned int id,
> > + struct hvm_ioreq_server *s)
> > +{
> > + ASSERT(id < MAX_NR_IOREQ_SERVERS);
> > + ASSERT(!s || !d->arch.hvm_domain.ioreq_server.server[id]);
> > +
> > + d->arch.hvm_domain.ioreq_server.server[id] = s;
> > +}
> > +
> > +#define GET_IOREQ_SERVER(d, id) \
> > + (d)->arch.hvm_domain.ioreq_server.server[id]
> > +
> > +static struct hvm_ioreq_server *get_ioreq_server(const struct domain
> *d,
> > + unsigned int id)
> > +{
> > + if ( id >= MAX_NR_IOREQ_SERVERS )
> > + return NULL;
> > +
> > + return GET_IOREQ_SERVER(d, id);
> > +}
> > +
> > +#define IS_DEFAULT(s) \
> > + ((s) == get_ioreq_server((s)->domain, DEFAULT_IOSERVID))
> > +
> > +/*
> > + * Iterate over all possible ioreq servers. The use of inline function
> > + * get_ioreq_server() in the increment is deliberate as use of the
> > + * GET_IOREQ_SERVER() macro will cause gcc to complain about an array
> > + * overflow.
> > + */
> > +#define FOR_EACH_IOREQ_SERVER(d, id, s) \
> > + for ( (id) = 0, (s) = GET_IOREQ_SERVER(d, 0); \
> > + (id) < MAX_NR_IOREQ_SERVERS; \
> > + (s) = get_ioreq_server(d, ++(id)) )
>
> I'm guessing from the various constructs, the list of ioreq servers
> might have embedded NULLs in the middle?
>
> If so, how about this?
>
> #define FOR_EACH_IOREQ_SERVER(d, id, s) \
> for ( (id) = 0, (s) = GET_IOREQ_SERVER(d, 0); \
> (id) < MAX_NR_IOREQ_SERVERS; \
> (s) = get_ioreq_server(d, ++(id)) ) \
> if ( !s ) \
> continue; \
> else
I'm ok with it but I'll wait for others opinion on whether this is taking the macro magic too far.
>
> Every single use of this loop has the continue clause, which will go
> subtly wrong if someone typos continue as break. This construct will
> work correctly with or without braces in the main body of code.
>
> (For very brave people,
> https://www.chiark.greenend.org.uk/~sgtatham/mp/
> is an interesting read for quite what is possible by taking the above to
> extremes.)
>
> Beyond that, why is GET_IOREQ_SERVER() needed? All it appears to do is
> complicate code which could perfectly easily use get_ioreq_server().
>
It omits a bounds check in cases where one is not needed. I could open code the array dereference but I think that's less tidy.
Paul
> ~Andrew
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^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH v8 01/11] x86/hvm/ioreq: maintain an array of ioreq servers rather than a list
2017-09-29 15:38 ` Paul Durrant
@ 2017-10-04 10:16 ` Jan Beulich
2017-10-04 10:20 ` Paul Durrant
2017-10-04 10:23 ` Andrew Cooper
0 siblings, 2 replies; 17+ messages in thread
From: Jan Beulich @ 2017-10-04 10:16 UTC (permalink / raw)
To: Andrew Cooper, Paul Durrant; +Cc: xen-devel
>>> On 29.09.17 at 17:38, <Paul.Durrant@citrix.com> wrote:
>> -----Original Message-----
>> From: Andrew Cooper
>> Sent: 29 September 2017 16:35
>> To: Paul Durrant <Paul.Durrant@citrix.com>; xen-devel@lists.xenproject.org
>> Cc: Jan Beulich <jbeulich@suse.com>
>> Subject: Re: [PATCH v8 01/11] x86/hvm/ioreq: maintain an array of ioreq
>> servers rather than a list
>>
>> On 29/09/17 15:51, Paul Durrant wrote:
>> > A subsequent patch will remove the current implicit limitation on creation
>> > of ioreq servers which is due to the allocation of gfns for the ioreq
>> > structures and buffered ioreq ring.
>> >
>> > It will therefore be necessary to introduce an explicit limit and, since
>> > this limit should be small, it simplifies the code to maintain an array of
>> > that size rather than using a list.
>> >
>> > Also, by reserving an array slot for the default server and populating
>> > array slots early in create, the need to pass an 'is_default' boolean
>> > to sub-functions can be avoided.
>> >
>> > Some function return values are changed by this patch: Specifically, in
>> > the case where the id of the default ioreq server is passed in, -
>> EOPNOTSUPP
>> > is now returned rather than -ENOENT.
>> >
>> > Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
>> > Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
>> > ---
>> > Cc: Jan Beulich <jbeulich@suse.com>
>> > Cc: Andrew Cooper <andrew.cooper3@citrix.com>
>> >
>> > v8:
>> > - Addressed various comments from Jan.
>> >
>> > v7:
>> > - Fixed assertion failure found in testing.
>> >
>> > v6:
>> > - Updated according to comments made by Roger on v4 that I'd missed.
>> >
>> > v5:
>> > - Switched GET/SET_IOREQ_SERVER() macros to get/set_ioreq_server()
>> > functions to avoid possible double-evaluation issues.
>> >
>> > v4:
>> > - Introduced more helper macros and relocated them to the top of the
>> > code.
>> >
>> > v3:
>> > - New patch (replacing "move is_default into struct hvm_ioreq_server") in
>> > response to review comments.
>> > ---
>> > xen/arch/x86/hvm/ioreq.c | 525 ++++++++++++++++++++--------------
>> -----
>> > xen/include/asm-x86/hvm/domain.h | 10 +-
>> > 2 files changed, 270 insertions(+), 265 deletions(-)
>> >
>> > diff --git a/xen/arch/x86/hvm/ioreq.c b/xen/arch/x86/hvm/ioreq.c
>> > index f2e0b3f74a..e655d2eab3 100644
>> > --- a/xen/arch/x86/hvm/ioreq.c
>> > +++ b/xen/arch/x86/hvm/ioreq.c
>> > @@ -33,6 +33,41 @@
>> >
>> > #include <public/hvm/ioreq.h>
>> >
>> > +static void set_ioreq_server(struct domain *d, unsigned int id,
>> > + struct hvm_ioreq_server *s)
>> > +{
>> > + ASSERT(id < MAX_NR_IOREQ_SERVERS);
>> > + ASSERT(!s || !d->arch.hvm_domain.ioreq_server.server[id]);
>> > +
>> > + d->arch.hvm_domain.ioreq_server.server[id] = s;
>> > +}
>> > +
>> > +#define GET_IOREQ_SERVER(d, id) \
>> > + (d)->arch.hvm_domain.ioreq_server.server[id]
>> > +
>> > +static struct hvm_ioreq_server *get_ioreq_server(const struct domain
>> *d,
>> > + unsigned int id)
>> > +{
>> > + if ( id >= MAX_NR_IOREQ_SERVERS )
>> > + return NULL;
>> > +
>> > + return GET_IOREQ_SERVER(d, id);
>> > +}
>> > +
>> > +#define IS_DEFAULT(s) \
>> > + ((s) == get_ioreq_server((s)->domain, DEFAULT_IOSERVID))
>> > +
>> > +/*
>> > + * Iterate over all possible ioreq servers. The use of inline function
>> > + * get_ioreq_server() in the increment is deliberate as use of the
>> > + * GET_IOREQ_SERVER() macro will cause gcc to complain about an array
>> > + * overflow.
>> > + */
>> > +#define FOR_EACH_IOREQ_SERVER(d, id, s) \
>> > + for ( (id) = 0, (s) = GET_IOREQ_SERVER(d, 0); \
>> > + (id) < MAX_NR_IOREQ_SERVERS; \
>> > + (s) = get_ioreq_server(d, ++(id)) )
>>
>> I'm guessing from the various constructs, the list of ioreq servers
>> might have embedded NULLs in the middle?
>>
>> If so, how about this?
>>
>> #define FOR_EACH_IOREQ_SERVER(d, id, s) \
>> for ( (id) = 0, (s) = GET_IOREQ_SERVER(d, 0); \
>> (id) < MAX_NR_IOREQ_SERVERS; \
>> (s) = get_ioreq_server(d, ++(id)) ) \
>> if ( !s ) \
>> continue; \
>> else
>
> I'm ok with it but I'll wait for others opinion on whether this is taking
> the macro magic too far.
I'm fine with Andrew's suggestion; I'm surprised though trickery
like this is being suggested at all, as commonly games I happen
to be trying to play once in a while don't seem to be really liked.
Jan
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^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH v8 01/11] x86/hvm/ioreq: maintain an array of ioreq servers rather than a list
2017-10-04 10:16 ` Jan Beulich
@ 2017-10-04 10:20 ` Paul Durrant
2017-10-04 10:23 ` Andrew Cooper
1 sibling, 0 replies; 17+ messages in thread
From: Paul Durrant @ 2017-10-04 10:20 UTC (permalink / raw)
To: 'Jan Beulich', Andrew Cooper; +Cc: xen-devel
> -----Original Message-----
> From: Jan Beulich [mailto:JBeulich@suse.com]
> Sent: 04 October 2017 11:16
> To: Andrew Cooper <Andrew.Cooper3@citrix.com>; Paul Durrant
> <Paul.Durrant@citrix.com>
> Cc: xen-devel@lists.xenproject.org
> Subject: RE: [PATCH v8 01/11] x86/hvm/ioreq: maintain an array of ioreq
> servers rather than a list
>
> >>> On 29.09.17 at 17:38, <Paul.Durrant@citrix.com> wrote:
> >> -----Original Message-----
> >> From: Andrew Cooper
> >> Sent: 29 September 2017 16:35
> >> To: Paul Durrant <Paul.Durrant@citrix.com>; xen-
> devel@lists.xenproject.org
> >> Cc: Jan Beulich <jbeulich@suse.com>
> >> Subject: Re: [PATCH v8 01/11] x86/hvm/ioreq: maintain an array of ioreq
> >> servers rather than a list
> >>
> >> On 29/09/17 15:51, Paul Durrant wrote:
> >> > A subsequent patch will remove the current implicit limitation on
> creation
> >> > of ioreq servers which is due to the allocation of gfns for the ioreq
> >> > structures and buffered ioreq ring.
> >> >
> >> > It will therefore be necessary to introduce an explicit limit and, since
> >> > this limit should be small, it simplifies the code to maintain an array of
> >> > that size rather than using a list.
> >> >
> >> > Also, by reserving an array slot for the default server and populating
> >> > array slots early in create, the need to pass an 'is_default' boolean
> >> > to sub-functions can be avoided.
> >> >
> >> > Some function return values are changed by this patch: Specifically, in
> >> > the case where the id of the default ioreq server is passed in, -
> >> EOPNOTSUPP
> >> > is now returned rather than -ENOENT.
> >> >
> >> > Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
> >> > Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
> >> > ---
> >> > Cc: Jan Beulich <jbeulich@suse.com>
> >> > Cc: Andrew Cooper <andrew.cooper3@citrix.com>
> >> >
> >> > v8:
> >> > - Addressed various comments from Jan.
> >> >
> >> > v7:
> >> > - Fixed assertion failure found in testing.
> >> >
> >> > v6:
> >> > - Updated according to comments made by Roger on v4 that I'd missed.
> >> >
> >> > v5:
> >> > - Switched GET/SET_IOREQ_SERVER() macros to get/set_ioreq_server()
> >> > functions to avoid possible double-evaluation issues.
> >> >
> >> > v4:
> >> > - Introduced more helper macros and relocated them to the top of the
> >> > code.
> >> >
> >> > v3:
> >> > - New patch (replacing "move is_default into struct
> hvm_ioreq_server") in
> >> > response to review comments.
> >> > ---
> >> > xen/arch/x86/hvm/ioreq.c | 525 ++++++++++++++++++++----------
> ----
> >> -----
> >> > xen/include/asm-x86/hvm/domain.h | 10 +-
> >> > 2 files changed, 270 insertions(+), 265 deletions(-)
> >> >
> >> > diff --git a/xen/arch/x86/hvm/ioreq.c b/xen/arch/x86/hvm/ioreq.c
> >> > index f2e0b3f74a..e655d2eab3 100644
> >> > --- a/xen/arch/x86/hvm/ioreq.c
> >> > +++ b/xen/arch/x86/hvm/ioreq.c
> >> > @@ -33,6 +33,41 @@
> >> >
> >> > #include <public/hvm/ioreq.h>
> >> >
> >> > +static void set_ioreq_server(struct domain *d, unsigned int id,
> >> > + struct hvm_ioreq_server *s)
> >> > +{
> >> > + ASSERT(id < MAX_NR_IOREQ_SERVERS);
> >> > + ASSERT(!s || !d->arch.hvm_domain.ioreq_server.server[id]);
> >> > +
> >> > + d->arch.hvm_domain.ioreq_server.server[id] = s;
> >> > +}
> >> > +
> >> > +#define GET_IOREQ_SERVER(d, id) \
> >> > + (d)->arch.hvm_domain.ioreq_server.server[id]
> >> > +
> >> > +static struct hvm_ioreq_server *get_ioreq_server(const struct domain
> >> *d,
> >> > + unsigned int id)
> >> > +{
> >> > + if ( id >= MAX_NR_IOREQ_SERVERS )
> >> > + return NULL;
> >> > +
> >> > + return GET_IOREQ_SERVER(d, id);
> >> > +}
> >> > +
> >> > +#define IS_DEFAULT(s) \
> >> > + ((s) == get_ioreq_server((s)->domain, DEFAULT_IOSERVID))
> >> > +
> >> > +/*
> >> > + * Iterate over all possible ioreq servers. The use of inline function
> >> > + * get_ioreq_server() in the increment is deliberate as use of the
> >> > + * GET_IOREQ_SERVER() macro will cause gcc to complain about an
> array
> >> > + * overflow.
> >> > + */
> >> > +#define FOR_EACH_IOREQ_SERVER(d, id, s) \
> >> > + for ( (id) = 0, (s) = GET_IOREQ_SERVER(d, 0); \
> >> > + (id) < MAX_NR_IOREQ_SERVERS; \
> >> > + (s) = get_ioreq_server(d, ++(id)) )
> >>
> >> I'm guessing from the various constructs, the list of ioreq servers
> >> might have embedded NULLs in the middle?
> >>
> >> If so, how about this?
> >>
> >> #define FOR_EACH_IOREQ_SERVER(d, id, s) \
> >> for ( (id) = 0, (s) = GET_IOREQ_SERVER(d, 0); \
> >> (id) < MAX_NR_IOREQ_SERVERS; \
> >> (s) = get_ioreq_server(d, ++(id)) ) \
> >> if ( !s ) \
> >> continue; \
> >> else
> >
> > I'm ok with it but I'll wait for others opinion on whether this is taking
> > the macro magic too far.
>
> I'm fine with Andrew's suggestion; I'm surprised though trickery
> like this is being suggested at all, as commonly games I happen
> to be trying to play once in a while don't seem to be really liked.
>
Yeah, I'm always nervous of macros getting too large... mainly because they end up being a pain to debug in my experience, but I'll re-do the macro as Andrew suggests.
Paul
> Jan
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^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH v8 01/11] x86/hvm/ioreq: maintain an array of ioreq servers rather than a list
2017-10-04 10:16 ` Jan Beulich
2017-10-04 10:20 ` Paul Durrant
@ 2017-10-04 10:23 ` Andrew Cooper
1 sibling, 0 replies; 17+ messages in thread
From: Andrew Cooper @ 2017-10-04 10:23 UTC (permalink / raw)
To: Jan Beulich, Paul Durrant; +Cc: xen-devel
On 04/10/17 11:16, Jan Beulich wrote:
>>>> On 29.09.17 at 17:38, <Paul.Durrant@citrix.com> wrote:
>>> -----Original Message-----
>>> From: Andrew Cooper
>>> Sent: 29 September 2017 16:35
>>> To: Paul Durrant <Paul.Durrant@citrix.com>; xen-devel@lists.xenproject.org
>>> Cc: Jan Beulich <jbeulich@suse.com>
>>> Subject: Re: [PATCH v8 01/11] x86/hvm/ioreq: maintain an array of ioreq
>>> servers rather than a list
>>>
>>> On 29/09/17 15:51, Paul Durrant wrote:
>>>> A subsequent patch will remove the current implicit limitation on creation
>>>> of ioreq servers which is due to the allocation of gfns for the ioreq
>>>> structures and buffered ioreq ring.
>>>>
>>>> It will therefore be necessary to introduce an explicit limit and, since
>>>> this limit should be small, it simplifies the code to maintain an array of
>>>> that size rather than using a list.
>>>>
>>>> Also, by reserving an array slot for the default server and populating
>>>> array slots early in create, the need to pass an 'is_default' boolean
>>>> to sub-functions can be avoided.
>>>>
>>>> Some function return values are changed by this patch: Specifically, in
>>>> the case where the id of the default ioreq server is passed in, -
>>> EOPNOTSUPP
>>>> is now returned rather than -ENOENT.
>>>>
>>>> Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
>>>> Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
>>>> ---
>>>> Cc: Jan Beulich <jbeulich@suse.com>
>>>> Cc: Andrew Cooper <andrew.cooper3@citrix.com>
>>>>
>>>> v8:
>>>> - Addressed various comments from Jan.
>>>>
>>>> v7:
>>>> - Fixed assertion failure found in testing.
>>>>
>>>> v6:
>>>> - Updated according to comments made by Roger on v4 that I'd missed.
>>>>
>>>> v5:
>>>> - Switched GET/SET_IOREQ_SERVER() macros to get/set_ioreq_server()
>>>> functions to avoid possible double-evaluation issues.
>>>>
>>>> v4:
>>>> - Introduced more helper macros and relocated them to the top of the
>>>> code.
>>>>
>>>> v3:
>>>> - New patch (replacing "move is_default into struct hvm_ioreq_server") in
>>>> response to review comments.
>>>> ---
>>>> xen/arch/x86/hvm/ioreq.c | 525 ++++++++++++++++++++--------------
>>> -----
>>>> xen/include/asm-x86/hvm/domain.h | 10 +-
>>>> 2 files changed, 270 insertions(+), 265 deletions(-)
>>>>
>>>> diff --git a/xen/arch/x86/hvm/ioreq.c b/xen/arch/x86/hvm/ioreq.c
>>>> index f2e0b3f74a..e655d2eab3 100644
>>>> --- a/xen/arch/x86/hvm/ioreq.c
>>>> +++ b/xen/arch/x86/hvm/ioreq.c
>>>> @@ -33,6 +33,41 @@
>>>>
>>>> #include <public/hvm/ioreq.h>
>>>>
>>>> +static void set_ioreq_server(struct domain *d, unsigned int id,
>>>> + struct hvm_ioreq_server *s)
>>>> +{
>>>> + ASSERT(id < MAX_NR_IOREQ_SERVERS);
>>>> + ASSERT(!s || !d->arch.hvm_domain.ioreq_server.server[id]);
>>>> +
>>>> + d->arch.hvm_domain.ioreq_server.server[id] = s;
>>>> +}
>>>> +
>>>> +#define GET_IOREQ_SERVER(d, id) \
>>>> + (d)->arch.hvm_domain.ioreq_server.server[id]
>>>> +
>>>> +static struct hvm_ioreq_server *get_ioreq_server(const struct domain
>>> *d,
>>>> + unsigned int id)
>>>> +{
>>>> + if ( id >= MAX_NR_IOREQ_SERVERS )
>>>> + return NULL;
>>>> +
>>>> + return GET_IOREQ_SERVER(d, id);
>>>> +}
>>>> +
>>>> +#define IS_DEFAULT(s) \
>>>> + ((s) == get_ioreq_server((s)->domain, DEFAULT_IOSERVID))
>>>> +
>>>> +/*
>>>> + * Iterate over all possible ioreq servers. The use of inline function
>>>> + * get_ioreq_server() in the increment is deliberate as use of the
>>>> + * GET_IOREQ_SERVER() macro will cause gcc to complain about an array
>>>> + * overflow.
>>>> + */
>>>> +#define FOR_EACH_IOREQ_SERVER(d, id, s) \
>>>> + for ( (id) = 0, (s) = GET_IOREQ_SERVER(d, 0); \
>>>> + (id) < MAX_NR_IOREQ_SERVERS; \
>>>> + (s) = get_ioreq_server(d, ++(id)) )
>>> I'm guessing from the various constructs, the list of ioreq servers
>>> might have embedded NULLs in the middle?
>>>
>>> If so, how about this?
>>>
>>> #define FOR_EACH_IOREQ_SERVER(d, id, s) \
>>> for ( (id) = 0, (s) = GET_IOREQ_SERVER(d, 0); \
>>> (id) < MAX_NR_IOREQ_SERVERS; \
>>> (s) = get_ioreq_server(d, ++(id)) ) \
>>> if ( !s ) \
>>> continue; \
>>> else
>> I'm ok with it but I'll wait for others opinion on whether this is taking
>> the macro magic too far.
> I'm fine with Andrew's suggestion; I'm surprised though trickery
> like this is being suggested at all, as commonly games I happen
> to be trying to play once in a while don't seem to be really liked.
I don't specifically recall a previous example. Either way, tricks like
this do need to be evaluated very carefully, based on how much they help
the code vs how much they hide.
In this case, the FOR_EACH doesn't imply sequential access over an
array, and code inside the loop which uses a break rather than a
continue will definitely cause subtle bugs. Therefore IMO, its benefits
outweigh the costs.
~Andrew
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^ permalink raw reply [flat|nested] 17+ messages in thread
end of thread, other threads:[~2017-10-04 10:23 UTC | newest]
Thread overview: 17+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-09-29 14:51 [PATCH v8 00/11] x86: guest resource mapping Paul Durrant
2017-09-29 14:51 ` [PATCH v8 01/11] x86/hvm/ioreq: maintain an array of ioreq servers rather than a list Paul Durrant
2017-09-29 15:35 ` Andrew Cooper
2017-09-29 15:38 ` Paul Durrant
2017-10-04 10:16 ` Jan Beulich
2017-10-04 10:20 ` Paul Durrant
2017-10-04 10:23 ` Andrew Cooper
2017-09-29 14:51 ` [PATCH v8 02/11] x86/hvm/ioreq: simplify code and use consistent naming Paul Durrant
2017-09-29 14:51 ` [PATCH v8 03/11] x86/hvm/ioreq: use gfn_t in struct hvm_ioreq_page Paul Durrant
2017-09-29 14:51 ` [PATCH v8 04/11] x86/hvm/ioreq: defer mapping gfns until they are actually requsted Paul Durrant
2017-09-29 14:51 ` [PATCH v8 05/11] x86/mm: add HYPERVISOR_memory_op to acquire guest resources Paul Durrant
2017-09-29 14:51 ` [PATCH v8 06/11] x86/hvm/ioreq: add a new mappable resource type Paul Durrant
2017-09-29 14:51 ` [PATCH v8 07/11] x86/mm: add an extra command to HYPERVISOR_mmu_update Paul Durrant
2017-09-29 14:51 ` [PATCH v8 08/11] tools/libxenforeignmemory: add support for resource mapping Paul Durrant
2017-09-29 14:51 ` [PATCH v8 09/11] tools/libxenforeignmemory: reduce xenforeignmemory_restrict code footprint Paul Durrant
2017-09-29 14:51 ` [PATCH v8 10/11] common: add a new mappable resource type: XENMEM_resource_grant_table Paul Durrant
2017-09-29 14:51 ` [PATCH v8 11/11] tools/libxenctrl: use new xenforeignmemory API to seed grant table Paul Durrant
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