[libvirt] [PATCH] xen: work with ia64 MAX_VIRT_CPUS of 64
Eric Blake
eblake at redhat.com
Fri Oct 29 17:19:50 UTC 2010
* src/xen/xen_hypervisor.c (MAX_VIRT_CPUS): Move...
* src/xen/xen_driver.h (MAX_VIRT_CPUS): ...so all xen code can see
same value.
* src/xen/xend_internal.c (sexpr_to_xend_domain_info)
(xenDaemonDomainGetVcpusFlags, xenDaemonParseSxpr)
(xenDaemonFormatSxpr): Work if MAX_VIRT_CPUS is 64 on a platform
where long is 64-bits.
* src/xen/xm_internal.c (xenXMDomainConfigParse)
(xenXMDomainConfigFormat): Likewise.
---
On at least the xen/stable branch of
git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git
we have the case where MAX_VIRT_CPUS is 32 for x86 but 64 for ia64.
That branch does not have XEN_LEGACY_MAX_VCPUS. But according
to our comments, other branches had only XEN_LEGACY_MAX_VCPUS,
which means that xm_internal.c would fail to compile without this
patch, when targetting xen headers that lack MAX_VIRT_CPUS.
src/xen/xen_driver.h | 8 ++++++++
src/xen/xen_hypervisor.c | 8 --------
src/xen/xend_internal.c | 17 +++++++++--------
src/xen/xm_internal.c | 9 +++++----
4 files changed, 22 insertions(+), 20 deletions(-)
diff --git a/src/xen/xen_driver.h b/src/xen/xen_driver.h
index 53f97d4..16d22f1 100644
--- a/src/xen/xen_driver.h
+++ b/src/xen/xen_driver.h
@@ -29,6 +29,14 @@
# include <winsock2.h>
# endif
+/* xen-unstable changeset 19788 removed MAX_VIRT_CPUS from public
+ * headers. Its semantic was retained with XEN_LEGACY_MAX_VCPUS.
+ * Ensure MAX_VIRT_CPUS is defined accordingly.
+ */
+# if !defined(MAX_VIRT_CPUS) && defined(XEN_LEGACY_MAX_VCPUS)
+# define MAX_VIRT_CPUS XEN_LEGACY_MAX_VCPUS
+# endif
+
extern int xenRegister (void);
# define XEN_UNIFIED_HYPERVISOR_OFFSET 0
diff --git a/src/xen/xen_hypervisor.c b/src/xen/xen_hypervisor.c
index 3797865..ec726fe 100644
--- a/src/xen/xen_hypervisor.c
+++ b/src/xen/xen_hypervisor.c
@@ -109,14 +109,6 @@ typedef privcmd_hypercall_t hypercall_t;
# define SYS_IFACE_MIN_VERS_NUMA 4
#endif
-/* xen-unstable changeset 19788 removed MAX_VIRT_CPUS from public
- * headers. Its semanitc was retained with XEN_LEGACY_MAX_VCPUS.
- * Ensure MAX_VIRT_CPUS is defined accordingly.
- */
-#if !defined(MAX_VIRT_CPUS) && defined(XEN_LEGACY_MAX_VCPUS)
-# define MAX_VIRT_CPUS XEN_LEGACY_MAX_VCPUS
-#endif
-
static int xen_ioctl_hypercall_cmd = 0;
static int initialized = 0;
static int in_init = 0;
diff --git a/src/xen/xend_internal.c b/src/xen/xend_internal.c
index 974e96b..614c036 100644
--- a/src/xen/xend_internal.c
+++ b/src/xen/xend_internal.c
@@ -2192,7 +2192,7 @@ xenDaemonParseSxpr(virConnectPtr conn,
}
def->maxvcpus = sexpr_int(root, "domain/vcpus");
- def->vcpus = count_one_bits(sexpr_int(root, "domain/vcpu_avail"));
+ def->vcpus = count_one_bits_l(sexpr_u64(root, "domain/vcpu_avail"));
if (!def->vcpus || def->maxvcpus < def->vcpus)
def->vcpus = def->maxvcpus;
@@ -2468,7 +2468,7 @@ sexpr_to_xend_domain_info(virDomainPtr domain, const struct sexpr *root,
}
info->cpuTime = sexpr_float(root, "domain/cpu_time") * 1000000000;
vcpus = sexpr_int(root, "domain/vcpus");
- info->nrVirtCpu = count_one_bits(sexpr_int(root, "domain/vcpu_avail"));
+ info->nrVirtCpu = count_one_bits_l(sexpr_u64(root, "domain/vcpu_avail"));
if (!info->nrVirtCpu || vcpus < info->nrVirtCpu)
info->nrVirtCpu = vcpus;
@@ -3706,7 +3706,7 @@ xenDaemonDomainGetVcpusFlags(virDomainPtr domain, unsigned int flags)
ret = sexpr_int(root, "domain/vcpus");
if (!(flags & VIR_DOMAIN_VCPU_MAXIMUM)) {
- int vcpus = count_one_bits(sexpr_int(root, "domain/vcpu_avail"));
+ int vcpus = count_one_bits_l(sexpr_u64(root, "domain/vcpu_avail"));
if (vcpus)
ret = MIN(vcpus, ret);
}
@@ -5770,10 +5770,11 @@ xenDaemonFormatSxpr(virConnectPtr conn,
virBufferVSprintf(&buf, "(memory %lu)(maxmem %lu)",
def->mem.cur_balloon/1024, def->mem.max_balloon/1024);
virBufferVSprintf(&buf, "(vcpus %u)", def->maxvcpus);
- /* Computing the vcpu_avail bitmask works because MAX_VIRT_CPUS is 32. */
- verify(MAX_VIRT_CPUS <= sizeof(1U) * CHAR_BIT);
+ /* Computing the vcpu_avail bitmask works because MAX_VIRT_CPUS is
+ either 32, or 64 on a platform where long is big enough. */
+ verify(MAX_VIRT_CPUS <= sizeof(1UL) * CHAR_BIT);
if (def->vcpus < def->maxvcpus)
- virBufferVSprintf(&buf, "(vcpu_avail %u)", (1U << def->vcpus) - 1);
+ virBufferVSprintf(&buf, "(vcpu_avail %lu)", (1UL << def->vcpus) - 1);
if (def->cpumask) {
char *ranges = virDomainCpuSetFormat(def->cpumask, def->cpumasklen);
@@ -5870,8 +5871,8 @@ xenDaemonFormatSxpr(virConnectPtr conn,
virBufferVSprintf(&buf, "(vcpus %u)", def->maxvcpus);
if (def->vcpus < def->maxvcpus)
- virBufferVSprintf(&buf, "(vcpu_avail %u)",
- (1U << def->vcpus) - 1);
+ virBufferVSprintf(&buf, "(vcpu_avail %lu)",
+ (1UL << def->vcpus) - 1);
for (i = 0 ; i < def->os.nBootDevs ; i++) {
switch (def->os.bootDevs[i]) {
diff --git a/src/xen/xm_internal.c b/src/xen/xm_internal.c
index f80e252..6c5df0f 100644
--- a/src/xen/xm_internal.c
+++ b/src/xen/xm_internal.c
@@ -776,7 +776,7 @@ xenXMDomainConfigParse(virConnectPtr conn, virConfPtr conf) {
def->maxvcpus = count;
if (xenXMConfigGetULong(conf, "vcpu_avail", &count, -1) < 0)
goto cleanup;
- def->vcpus = MIN(count_one_bits(count), def->maxvcpus);
+ def->vcpus = MIN(count_one_bits_l(count), def->maxvcpus);
if (xenXMConfigGetString(conf, "cpus", &str, NULL) < 0)
goto cleanup;
@@ -2336,10 +2336,11 @@ virConfPtr xenXMDomainConfigFormat(virConnectPtr conn,
if (xenXMConfigSetInt(conf, "vcpus", def->maxvcpus) < 0)
goto no_memory;
- /* Computing the vcpu_avail bitmask works because MAX_VIRT_CPUS is 32. */
- verify(MAX_VIRT_CPUS <= sizeof(1U) * CHAR_BIT);
+ /* Computing the vcpu_avail bitmask works because MAX_VIRT_CPUS is
+ either 32, or 64 on a platform where long is big enough. */
+ verify(MAX_VIRT_CPUS <= sizeof(1UL) * CHAR_BIT);
if (def->vcpus < def->maxvcpus &&
- xenXMConfigSetInt(conf, "vcpu_avail", (1U << def->vcpus) - 1) < 0)
+ xenXMConfigSetInt(conf, "vcpu_avail", (1UL << def->vcpus) - 1) < 0)
goto no_memory;
if ((def->cpumask != NULL) &&
--
1.7.2.3
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