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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2] x86/hvm: remove default ioreq server
My recent patch [1] to qemu-xen-traditional removes the last use of the
'default' ioreq server in Xen. (This is a catch-all ioreq server that is
used if no explicitly registered I/O range is targetted).
This patch can be applied once that patch is committed, to remove the
(>100 lines of) redundant code in Xen.
NOTE: The removal of the special case for HVM_PARAM_DM_DOMAIN in
hvm_allow_set_param() is not directly related to removal of
default ioreq servers. It could have been cleaned up at any time
after commit 9a422c03 "x86/hvm: stop passing explicit domid to
hvm_create_ioreq_server()".
[1] https://lists.xenproject.org/archives/html/xen-devel/2018-08/msg00270.html
Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
v2:
- Disallow reads or writes of HVM_PARAM_BUFIOREQ_EVTCHN and mark it as
deprecated in the header.
- Updated commit comment w.r.t. HVM_PARAM_DM_DOMAIN change.
---
xen/arch/x86/hvm/dm.c | 2 +-
xen/arch/x86/hvm/hvm.c | 36 +++---------
xen/arch/x86/hvm/ioreq.c | 123 +++++----------------------------------
xen/include/asm-x86/hvm/domain.h | 1 -
xen/include/asm-x86/hvm/ioreq.h | 4 +-
xen/include/public/hvm/params.h | 5 +-
6 files changed, 30 insertions(+), 141 deletions(-)
diff --git a/xen/arch/x86/hvm/dm.c b/xen/arch/x86/hvm/dm.c
index 6755f3fd96..6ace3dc7c1 100644
--- a/xen/arch/x86/hvm/dm.c
+++ b/xen/arch/x86/hvm/dm.c
@@ -411,7 +411,7 @@ static int dm_op(const struct dmop_args *op_args)
if ( data->pad[0] || data->pad[1] || data->pad[2] )
break;
- rc = hvm_create_ioreq_server(d, false, data->handle_bufioreq,
+ rc = hvm_create_ioreq_server(d, data->handle_bufioreq,
&data->id);
break;
}
diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 72c51faecb..a797fc21c4 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -4093,12 +4093,15 @@ static int hvm_allow_set_param(struct domain *d,
case HVM_PARAM_CONSOLE_EVTCHN:
case HVM_PARAM_X87_FIP_WIDTH:
break;
+ /* The following parameters are deprecated. */
+ case HVM_PARAM_BUFIOREQ_EVTCHN:
+ rc = -EPERM;
+ break;
/*
* The following parameters must not be set by the guest
* since the domain may need to be paused.
*/
case HVM_PARAM_IDENT_PT:
- case HVM_PARAM_DM_DOMAIN:
case HVM_PARAM_ACPI_S_STATE:
/* The remaining parameters should not be set by the guest. */
default:
@@ -4263,9 +4266,6 @@ static int hvmop_set_param(
d->arch.hvm_domain.params[HVM_PARAM_NESTEDHVM] )
rc = -EINVAL;
break;
- case HVM_PARAM_BUFIOREQ_EVTCHN:
- rc = -EINVAL;
- break;
case HVM_PARAM_TRIPLE_FAULT_REASON:
if ( a.value > SHUTDOWN_MAX )
rc = -EINVAL;
@@ -4373,13 +4373,10 @@ static int hvm_allow_get_param(struct domain *d,
case HVM_PARAM_ALTP2M:
case HVM_PARAM_X87_FIP_WIDTH:
break;
- /*
- * The following parameters must not be read by the guest
- * since the domain may need to be paused.
- */
- case HVM_PARAM_IOREQ_PFN:
- case HVM_PARAM_BUFIOREQ_PFN:
+ /* The following parameters are deprecated. */
case HVM_PARAM_BUFIOREQ_EVTCHN:
+ rc = -ENODATA;
+ break;
/* The remaining parameters should not be read by the guest. */
default:
if ( d == current->domain )
@@ -4433,25 +4430,6 @@ static int hvmop_get_param(
case HVM_PARAM_X87_FIP_WIDTH:
a.value = d->arch.x87_fip_width;
break;
- case HVM_PARAM_IOREQ_PFN:
- case HVM_PARAM_BUFIOREQ_PFN:
- case HVM_PARAM_BUFIOREQ_EVTCHN:
- /*
- * It may be necessary to create a default ioreq server here,
- * because legacy versions of QEMU are not aware of the new API for
- * explicit ioreq server creation. However, if the domain is not
- * under construction then it will not be QEMU querying the
- * parameters and thus the query should not have that side-effect.
- */
- if ( !d->creation_finished )
- {
- rc = hvm_create_ioreq_server(d, true,
- HVM_IOREQSRV_BUFIOREQ_LEGACY, NULL);
- if ( rc != 0 && rc != -EEXIST )
- goto out;
- }
-
- /*FALLTHRU*/
default:
a.value = d->arch.hvm_domain.params[a.index];
break;
diff --git a/xen/arch/x86/hvm/ioreq.c b/xen/arch/x86/hvm/ioreq.c
index 7c515b3ef7..9cb3819c6b 100644
--- a/xen/arch/x86/hvm/ioreq.c
+++ b/xen/arch/x86/hvm/ioreq.c
@@ -55,9 +55,6 @@ static struct hvm_ioreq_server *get_ioreq_server(const struct
domain *d,
return GET_IOREQ_SERVER(d, id);
}
-#define IS_DEFAULT(s) \
- ((s) && (s) == GET_IOREQ_SERVER((s)->target, DEFAULT_IOSERVID))
-
/*
* Iterate over all possible ioreq servers.
*
@@ -245,8 +242,6 @@ static gfn_t hvm_alloc_ioreq_gfn(struct hvm_ioreq_server *s)
struct domain *d = s->target;
unsigned int i;
- 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) )
@@ -261,7 +256,6 @@ static void hvm_free_ioreq_gfn(struct hvm_ioreq_server *s,
gfn_t gfn)
struct domain *d = s->target;
unsigned int i = gfn_x(gfn) - d->arch.hvm_domain.ioreq_gfn.base;
- ASSERT(!IS_DEFAULT(s));
ASSERT(!gfn_eq(gfn, INVALID_GFN));
set_bit(i, &d->arch.hvm_domain.ioreq_gfn.mask);
@@ -277,9 +271,7 @@ static void hvm_unmap_ioreq_gfn(struct hvm_ioreq_server *s,
bool buf)
destroy_ring_for_helper(&iorp->va, iorp->page);
iorp->page = NULL;
- if ( !IS_DEFAULT(s) )
- hvm_free_ioreq_gfn(s, iorp->gfn);
-
+ hvm_free_ioreq_gfn(s, iorp->gfn);
iorp->gfn = INVALID_GFN;
}
@@ -305,13 +297,7 @@ static int hvm_map_ioreq_gfn(struct hvm_ioreq_server *s,
bool buf)
if ( d->is_dying )
return -EINVAL;
- if ( IS_DEFAULT(s) )
- 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);
-
+ iorp->gfn = hvm_alloc_ioreq_gfn(s);
if ( gfn_eq(iorp->gfn, INVALID_GFN) )
return -ENOMEM;
@@ -416,7 +402,7 @@ static void hvm_remove_ioreq_gfn(struct hvm_ioreq_server
*s, bool buf)
struct domain *d = s->target;
struct hvm_ioreq_page *iorp = buf ? &s->bufioreq : &s->ioreq;
- if ( IS_DEFAULT(s) || gfn_eq(iorp->gfn, INVALID_GFN) )
+ if ( gfn_eq(iorp->gfn, INVALID_GFN) )
return;
if ( guest_physmap_remove_page(d, iorp->gfn,
@@ -431,7 +417,7 @@ 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) || gfn_eq(iorp->gfn, INVALID_GFN) )
+ if ( gfn_eq(iorp->gfn, INVALID_GFN) )
return 0;
clear_page(iorp->va);
@@ -483,17 +469,12 @@ static int hvm_ioreq_server_add_vcpu(struct
hvm_ioreq_server *s,
if ( v->vcpu_id == 0 && HANDLE_BUFIOREQ(s) )
{
- struct domain *d = s->target;
-
rc = alloc_unbound_xen_event_channel(v->domain, 0,
s->emulator->domain_id, NULL);
if ( rc < 0 )
goto fail3;
s->bufioreq_evtchn = rc;
- if ( IS_DEFAULT(s) )
- d->arch.hvm_domain.params[HVM_PARAM_BUFIOREQ_EVTCHN] =
- s->bufioreq_evtchn;
}
sv->vcpu = v;
@@ -617,9 +598,6 @@ static void hvm_ioreq_server_free_rangesets(struct
hvm_ioreq_server *s)
{
unsigned int i;
- if ( IS_DEFAULT(s) )
- return;
-
for ( i = 0; i < NR_IO_RANGE_TYPES; i++ )
rangeset_destroy(s->range[i]);
}
@@ -630,11 +608,6 @@ static int hvm_ioreq_server_alloc_rangesets(struct
hvm_ioreq_server *s,
unsigned int i;
int rc;
- if ( id == DEFAULT_IOSERVID )
- goto done;
-
- ASSERT(!IS_DEFAULT(s));
-
for ( i = 0; i < NR_IO_RANGE_TYPES; i++ )
{
char *name;
@@ -659,7 +632,6 @@ static int hvm_ioreq_server_alloc_rangesets(struct
hvm_ioreq_server *s,
rangeset_limit(s->range[i], MAX_NR_IO_RANGES);
}
- done:
return 0;
fail:
@@ -733,13 +705,6 @@ static int hvm_ioreq_server_init(struct hvm_ioreq_server
*s,
s->bufioreq_handling = bufioreq_handling;
- if ( id == DEFAULT_IOSERVID )
- {
- rc = hvm_ioreq_server_map_pages(s);
- if ( rc )
- goto fail_map;
- }
-
for_each_vcpu ( d, v )
{
rc = hvm_ioreq_server_add_vcpu(s, v);
@@ -753,7 +718,6 @@ 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);
put_domain(s->emulator);
@@ -782,8 +746,8 @@ static void hvm_ioreq_server_deinit(struct hvm_ioreq_server
*s)
put_domain(s->emulator);
}
-int hvm_create_ioreq_server(struct domain *d, bool is_default,
- int bufioreq_handling, ioservid_t *id)
+int hvm_create_ioreq_server(struct domain *d, int bufioreq_handling,
+ ioservid_t *id)
{
struct hvm_ioreq_server *s;
unsigned int i;
@@ -799,32 +763,19 @@ int hvm_create_ioreq_server(struct domain *d, bool
is_default,
domain_pause(d);
spin_lock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
- if ( is_default )
+ for ( i = 0; i < MAX_NR_IOREQ_SERVERS; i++ )
{
- i = DEFAULT_IOSERVID;
-
- rc = -EEXIST;
- if ( GET_IOREQ_SERVER(d, i) )
- goto fail;
+ if ( !GET_IOREQ_SERVER(d, i) )
+ break;
}
- 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;
- }
+ rc = -ENOSPC;
+ if ( i >= MAX_NR_IOREQ_SERVERS )
+ goto fail;
/*
* It is safe to call set_ioreq_server() prior to
* hvm_ioreq_server_init() since the target domain is paused.
- * It is necessary for the calls to be ordered thus otherwise
- * the IS_DEFAULT() macro would not evaluate correctly.
*/
set_ioreq_server(d, i, s);
@@ -835,9 +786,6 @@ int hvm_create_ioreq_server(struct domain *d, bool
is_default,
goto fail;
}
- if ( i == DEFAULT_IOSERVID )
- hvm_ioreq_server_enable(s);
-
if ( id )
*id = i;
@@ -859,9 +807,6 @@ 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);
s = get_ioreq_server(d, id);
@@ -870,8 +815,6 @@ int hvm_destroy_ioreq_server(struct domain *d, ioservid_t
id)
if ( !s )
goto out;
- ASSERT(!IS_DEFAULT(s));
-
rc = -EPERM;
if ( s->emulator != current->domain )
goto out;
@@ -884,9 +827,7 @@ int hvm_destroy_ioreq_server(struct domain *d, ioservid_t
id)
/*
* It is safe to call hvm_ioreq_server_deinit() prior to
- * set_ioreq_server() since the target domain is paused. It is
- * necessary for the calls to be ordered thus otherwise the
- * IS_DEFAULT() macro would not evaluate correctly.
+ * set_ioreq_server() since the target domain is paused.
*/
hvm_ioreq_server_deinit(s);
set_ioreq_server(d, id, NULL);
@@ -911,9 +852,6 @@ 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);
s = get_ioreq_server(d, id);
@@ -922,8 +860,6 @@ int hvm_get_ioreq_server_info(struct domain *d, ioservid_t
id,
if ( !s )
goto out;
- ASSERT(!IS_DEFAULT(s));
-
rc = -EPERM;
if ( s->emulator != current->domain )
goto out;
@@ -961,9 +897,6 @@ int hvm_get_ioreq_server_frame(struct domain *d, ioservid_t
id,
struct hvm_ioreq_server *s;
int rc;
- if ( id == DEFAULT_IOSERVID )
- return -EOPNOTSUPP;
-
if ( !is_hvm_domain(d) )
return -EINVAL;
@@ -975,8 +908,6 @@ int hvm_get_ioreq_server_frame(struct domain *d, ioservid_t
id,
if ( !s )
goto out;
- ASSERT(!IS_DEFAULT(s));
-
rc = -EPERM;
if ( s->emulator != current->domain )
goto out;
@@ -1023,9 +954,6 @@ int hvm_map_io_range_to_ioreq_server(struct domain *d,
ioservid_t id,
if ( start > end )
return -EINVAL;
- if ( id == DEFAULT_IOSERVID )
- return -EOPNOTSUPP;
-
spin_lock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
s = get_ioreq_server(d, id);
@@ -1034,8 +962,6 @@ int hvm_map_io_range_to_ioreq_server(struct domain *d,
ioservid_t id,
if ( !s )
goto out;
- ASSERT(!IS_DEFAULT(s));
-
rc = -EPERM;
if ( s->emulator != current->domain )
goto out;
@@ -1080,9 +1006,6 @@ int hvm_unmap_io_range_from_ioreq_server(struct domain
*d, ioservid_t id,
if ( start > end )
return -EINVAL;
- if ( id == DEFAULT_IOSERVID )
- return -EOPNOTSUPP;
-
spin_lock_recursive(&d->arch.hvm_domain.ioreq_server.lock);
s = get_ioreq_server(d, id);
@@ -1091,8 +1014,6 @@ int hvm_unmap_io_range_from_ioreq_server(struct domain
*d, ioservid_t id,
if ( !s )
goto out;
- ASSERT(!IS_DEFAULT(s));
-
rc = -EPERM;
if ( s->emulator != current->domain )
goto out;
@@ -1140,9 +1061,6 @@ 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;
@@ -1157,8 +1075,6 @@ int hvm_map_mem_type_to_ioreq_server(struct domain *d,
ioservid_t id,
if ( !s )
goto out;
- ASSERT(!IS_DEFAULT(s));
-
rc = -EPERM;
if ( s->emulator != current->domain )
goto out;
@@ -1185,9 +1101,6 @@ int hvm_set_ioreq_server_state(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);
s = get_ioreq_server(d, id);
@@ -1196,8 +1109,6 @@ int hvm_set_ioreq_server_state(struct domain *d,
ioservid_t id,
if ( !s )
goto out;
- ASSERT(!IS_DEFAULT(s));
-
rc = -EPERM;
if ( s->emulator != current->domain )
goto out;
@@ -1282,8 +1193,6 @@ void hvm_destroy_all_ioreq_servers(struct domain *d)
/*
* It is safe to call hvm_ioreq_server_deinit() prior to
* set_ioreq_server() since the target domain is being destroyed.
- * It is necessary for the calls to be ordered thus otherwise the
- * IS_DEFAULT() macro would not evaluate correctly.
*/
hvm_ioreq_server_deinit(s);
set_ioreq_server(d, id, NULL);
@@ -1304,7 +1213,7 @@ struct hvm_ioreq_server *hvm_select_ioreq_server(struct
domain *d,
unsigned int id;
if ( p->type != IOREQ_TYPE_COPY && p->type != IOREQ_TYPE_PIO )
- return GET_IOREQ_SERVER(d, DEFAULT_IOSERVID);
+ return NULL;
cf8 = d->arch.hvm_domain.pci_cf8;
@@ -1346,7 +1255,7 @@ struct hvm_ioreq_server *hvm_select_ioreq_server(struct
domain *d,
{
struct rangeset *r;
- if ( IS_DEFAULT(s) || !s->enabled )
+ if ( !s->enabled )
continue;
r = s->range[type];
@@ -1379,7 +1288,7 @@ struct hvm_ioreq_server *hvm_select_ioreq_server(struct
domain *d,
}
}
- return GET_IOREQ_SERVER(d, DEFAULT_IOSERVID);
+ return NULL;
}
static int hvm_send_buffered_ioreq(struct hvm_ioreq_server *s, ioreq_t *p)
diff --git a/xen/include/asm-x86/hvm/domain.h b/xen/include/asm-x86/hvm/domain.h
index 588595059d..2398858442 100644
--- a/xen/include/asm-x86/hvm/domain.h
+++ b/xen/include/asm-x86/hvm/domain.h
@@ -97,7 +97,6 @@ struct hvm_pi_ops {
};
#define MAX_NR_IOREQ_SERVERS 8
-#define DEFAULT_IOSERVID 0
struct hvm_domain {
/* Guest page range used for non-default ioreq servers */
diff --git a/xen/include/asm-x86/hvm/ioreq.h b/xen/include/asm-x86/hvm/ioreq.h
index bab473cf44..e2588e912f 100644
--- a/xen/include/asm-x86/hvm/ioreq.h
+++ b/xen/include/asm-x86/hvm/ioreq.h
@@ -23,8 +23,8 @@ bool hvm_io_pending(struct vcpu *v);
bool handle_hvm_io_completion(struct vcpu *v);
bool is_ioreq_server_page(struct domain *d, const struct page_info *page);
-int hvm_create_ioreq_server(struct domain *d, bool is_default,
- int bufioreq_handling, ioservid_t *id);
+int hvm_create_ioreq_server(struct domain *d, int bufioreq_handling,
+ ioservid_t *id);
int hvm_destroy_ioreq_server(struct domain *d, ioservid_t id);
int hvm_get_ioreq_server_info(struct domain *d, ioservid_t id,
unsigned long *ioreq_gfn,
diff --git a/xen/include/public/hvm/params.h b/xen/include/public/hvm/params.h
index 396977c2bb..d0ae58f683 100644
--- a/xen/include/public/hvm/params.h
+++ b/xen/include/public/hvm/params.h
@@ -81,9 +81,12 @@
#define HVM_PARAM_PAE_ENABLED 4
#define HVM_PARAM_IOREQ_PFN 5
-
#define HVM_PARAM_BUFIOREQ_PFN 6
+
+#ifdef __XEN__
+/* This parameter is deprecated and its meaning is undefined */
#define HVM_PARAM_BUFIOREQ_EVTCHN 26
+#endif
#if defined(__i386__) || defined(__x86_64__)
--
2.11.0
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