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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH 7/7] domctl: Modify getdomaininfo to fail if domid is not found
It previously mimicked the getdomaininfo sysctl semantics by returning
the first domid higher than the requested domid that does exist. This
unintuitive behaviour causes quite a few mistakes and makes the call
needlessly slow in its error path.
This patch removes the fallback search, returning -ESRCH if the requested
domain doesn't exist. Domain discovery can still be done through the sysctl
interface as that performs a linear search on the list of domains.
With this modification the xc_domain_getinfo() function is deprecated and
removed to make sure it's not mistakenly used expecting the old behaviour.
The new xc wrapper is xc_domain_getinfo_single().
All previous callers of xc_domain_getinfo() have been updated to use
xc_domain_getinfo_single() or xc_domain_getinfolist() instead. This also
means xc_dominfo_t is no longer used by anything and can be purged.
Resolves: xen-project/xen#105
Signed-off-by: Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>
---
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: George Dunlap <george.dunlap@xxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Julien Grall <julien@xxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Wei Liu <wl@xxxxxxx>
Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>
Cc: Juergen Gross <jgross@xxxxxxxx>
---
tools/include/xenctrl.h | 43 -----------------------
tools/libs/ctrl/xc_domain.c | 70 -------------------------------------
xen/common/domctl.c | 32 ++---------------
3 files changed, 2 insertions(+), 143 deletions(-)
diff --git a/tools/include/xenctrl.h b/tools/include/xenctrl.h
index 755759f0fe..7ed22eff0d 100644
--- a/tools/include/xenctrl.h
+++ b/tools/include/xenctrl.h
@@ -444,28 +444,6 @@ typedef struct xc_core_header {
* DOMAIN MANAGEMENT FUNCTIONS
*/
-typedef struct xc_dominfo {
- uint32_t domid;
- uint32_t ssidref;
- unsigned int dying:1, crashed:1, shutdown:1,
- paused:1, blocked:1, running:1,
- hvm:1, debugged:1, xenstore:1, hap:1;
- unsigned int shutdown_reason; /* only meaningful if shutdown==1 */
- unsigned long nr_pages; /* current number, not maximum */
- unsigned long nr_outstanding_pages;
- unsigned long nr_shared_pages;
- unsigned long nr_paged_pages;
- unsigned long shared_info_frame;
- uint64_t cpu_time;
- unsigned long max_memkb;
- unsigned int nr_online_vcpus;
- unsigned int max_vcpu_id;
- xen_domain_handle_t handle;
- unsigned int cpupool;
- uint8_t gpaddr_bits;
- struct xen_arch_domainconfig arch_config;
-} xc_dominfo_t;
-
typedef xen_domctl_getdomaininfo_t xc_domaininfo_t;
static inline unsigned int dominfo_shutdown_reason(const xc_domaininfo_t *info)
@@ -720,27 +698,6 @@ int xc_domain_getinfo_single(xc_interface *xch,
uint32_t domid,
xc_domaininfo_t *info);
-/**
- * This function will return information about one or more domains. It is
- * designed to iterate over the list of domains. If a single domain is
- * requested, this function will return the next domain in the list - if
- * one exists. It is, therefore, important in this case to make sure the
- * domain requested was the one returned.
- *
- * @parm xch a handle to an open hypervisor interface
- * @parm first_domid the first domain to enumerate information from. Domains
- * are currently enumerate in order of creation.
- * @parm max_doms the number of elements in info
- * @parm info an array of max_doms size that will contain the information for
- * the enumerated domains.
- * @return the number of domains enumerated or -1 on error
- */
-int xc_domain_getinfo(xc_interface *xch,
- uint32_t first_domid,
- unsigned int max_doms,
- xc_dominfo_t *info);
-
-
/**
* This function will set the execution context for the specified vcpu.
*
diff --git a/tools/libs/ctrl/xc_domain.c b/tools/libs/ctrl/xc_domain.c
index 5c37dbe200..581e7529e5 100644
--- a/tools/libs/ctrl/xc_domain.c
+++ b/tools/libs/ctrl/xc_domain.c
@@ -358,82 +358,12 @@ int xc_domain_getinfo_single(xc_interface *xch,
if (rc < 0)
return rc;
- if (domctl.u.getdomaininfo.domain != domid)
- return -ESRCH;
-
if (info)
*info = domctl.u.getdomaininfo;
return rc;
}
-int xc_domain_getinfo(xc_interface *xch,
- uint32_t first_domid,
- unsigned int max_doms,
- xc_dominfo_t *info)
-{
- unsigned int nr_doms;
- uint32_t next_domid = first_domid;
- DECLARE_DOMCTL;
- int rc = 0;
-
- memset(info, 0, max_doms*sizeof(xc_dominfo_t));
-
- for ( nr_doms = 0; nr_doms < max_doms; nr_doms++ )
- {
- domctl.cmd = XEN_DOMCTL_getdomaininfo;
- domctl.domain = next_domid;
- if ( (rc = do_domctl(xch, &domctl)) < 0 )
- break;
- info->domid = domctl.domain;
-
- info->dying = !!(domctl.u.getdomaininfo.flags&XEN_DOMINF_dying);
- info->shutdown = !!(domctl.u.getdomaininfo.flags&XEN_DOMINF_shutdown);
- info->paused = !!(domctl.u.getdomaininfo.flags&XEN_DOMINF_paused);
- info->blocked = !!(domctl.u.getdomaininfo.flags&XEN_DOMINF_blocked);
- info->running = !!(domctl.u.getdomaininfo.flags&XEN_DOMINF_running);
- info->hvm = !!(domctl.u.getdomaininfo.flags&XEN_DOMINF_hvm_guest);
- info->debugged = !!(domctl.u.getdomaininfo.flags&XEN_DOMINF_debugged);
- info->xenstore = !!(domctl.u.getdomaininfo.flags&XEN_DOMINF_xs_domain);
- info->hap = !!(domctl.u.getdomaininfo.flags&XEN_DOMINF_hap);
-
- info->shutdown_reason =
- (domctl.u.getdomaininfo.flags>>XEN_DOMINF_shutdownshift) &
- XEN_DOMINF_shutdownmask;
-
- if ( info->shutdown && (info->shutdown_reason == SHUTDOWN_crash) )
- {
- info->shutdown = 0;
- info->crashed = 1;
- }
-
- info->ssidref = domctl.u.getdomaininfo.ssidref;
- info->nr_pages = domctl.u.getdomaininfo.tot_pages;
- info->nr_outstanding_pages = domctl.u.getdomaininfo.outstanding_pages;
- info->nr_shared_pages = domctl.u.getdomaininfo.shr_pages;
- info->nr_paged_pages = domctl.u.getdomaininfo.paged_pages;
- info->max_memkb = domctl.u.getdomaininfo.max_pages << (PAGE_SHIFT-10);
- info->shared_info_frame = domctl.u.getdomaininfo.shared_info_frame;
- info->cpu_time = domctl.u.getdomaininfo.cpu_time;
- info->nr_online_vcpus = domctl.u.getdomaininfo.nr_online_vcpus;
- info->max_vcpu_id = domctl.u.getdomaininfo.max_vcpu_id;
- info->cpupool = domctl.u.getdomaininfo.cpupool;
- info->gpaddr_bits = domctl.u.getdomaininfo.gpaddr_bits;
- info->arch_config = domctl.u.getdomaininfo.arch_config;
-
- memcpy(info->handle, domctl.u.getdomaininfo.handle,
- sizeof(xen_domain_handle_t));
-
- next_domid = (uint16_t)domctl.domain + 1;
- info++;
- }
-
- if ( nr_doms == 0 )
- return rc;
-
- return nr_doms;
-}
-
int xc_domain_getinfolist(xc_interface *xch,
uint32_t first_domain,
unsigned int max_domains,
diff --git a/xen/common/domctl.c b/xen/common/domctl.c
index ad71ad8a4c..24a14996e6 100644
--- a/xen/common/domctl.c
+++ b/xen/common/domctl.c
@@ -314,7 +314,7 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t)
u_domctl)
/* fall through */
default:
d = rcu_lock_domain_by_id(op->domain);
- if ( !d && op->cmd != XEN_DOMCTL_getdomaininfo )
+ if ( !d )
return -ESRCH;
}
@@ -534,42 +534,14 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t)
u_domctl)
case XEN_DOMCTL_getdomaininfo:
{
- domid_t dom = DOMID_INVALID;
-
- if ( !d )
- {
- ret = -EINVAL;
- if ( op->domain >= DOMID_FIRST_RESERVED )
- break;
-
- rcu_read_lock(&domlist_read_lock);
-
- dom = op->domain;
- for_each_domain ( d )
- if ( d->domain_id >= dom )
- break;
- }
-
- ret = -ESRCH;
- if ( d == NULL )
- goto getdomaininfo_out;
-
ret = xsm_getdomaininfo(XSM_HOOK, d);
if ( ret )
- goto getdomaininfo_out;
+ break;
getdomaininfo(d, &op->u.getdomaininfo);
op->domain = op->u.getdomaininfo.domain;
copyback = 1;
-
- getdomaininfo_out:
- /* When d was non-NULL upon entry, no cleanup is needed. */
- if ( dom == DOMID_INVALID )
- break;
-
- rcu_read_unlock(&domlist_read_lock);
- d = NULL;
break;
}
--
2.34.1
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