If the size of the vcpu array in struct domain is known, use it
to size the dynamically allocated vcpu array in crash. This enables
crash to initialize domains with a different number of VCPUs than
specified by the XEN_HYPER_MAX_VIRT_CPUS macro.

Signed-off-by: Petr Tesarik <ptesarik@suse.cz>

---
xen_hyper.c | 15 +++++++++++----
xen_hyper_defs.h | 1 +
2 files changed, 12 insertions(+), 4 deletions(-)

--- a/xen_hyper.c
+++ b/xen_hyper.c
@@ -219,6 +219,7 @@ xen_hyper_domain_init(void)
XEN_HYPER_MEMBER_OFFSET_INIT(domain_is_shutting_do wn, "domain",
"is_shutting_down");
XEN_HYPER_MEMBER_OFFSET_INIT(domain_is_shut_down, "domain",
"is_shut_down");
XEN_HYPER_MEMBER_OFFSET_INIT(domain_vcpu, "domain", "vcpu");
+ XEN_HYPER_MEMBER_SIZE_INIT(domain_vcpu, "domain", "vcpu");
XEN_HYPER_MEMBER_OFFSET_INIT(domain_arch, "domain", "arch");

XEN_HYPER_STRUCT_SIZE_INIT(arch_shared_info, "arch_shared_info");
@@ -1207,7 +1208,8 @@ struct xen_hyper_domain_context *
xen_hyper_store_domain_context(struct xen_hyper_domain_context *dc,
ulong domain, char *dp)
{
- int i;
+ unsigned int max_vcpus;
+ unsigned int i;

dc->domain = domain;
BCOPY((char *)(dp + XEN_HYPER_OFFSET(domain_domain_id)),
@@ -1244,11 +1246,16 @@ xen_hyper_store_domain_context(struct xe
dc->domain_flags = XEN_HYPER_DOMF_ERROR;
}
dc->evtchn = ULONG(dp + XEN_HYPER_OFFSET(domain_evtchn));
- if (!(dc->vcpu = malloc(sizeof(ulong) * XEN_HYPER_MAX_VIRT_CPUS))) {
+ if (XEN_HYPER_VALID_SIZE(domain_vcpu)) {
+ max_vcpus = XEN_HYPER_SIZE(domain_vcpu) / sizeof(void *);
+ } else {
+ max_vcpus = XEN_HYPER_MAX_VIRT_CPUS;
+ }
+ if (!(dc->vcpu = malloc(sizeof(ulong) * max_vcpus))) {
error(FATAL, "cannot malloc vcpu array (%d VCPUs).",
- XEN_HYPER_MAX_VIRT_CPUS);
+ max_vcpus);
}
- for (i = 0; i < XEN_HYPER_MAX_VIRT_CPUS; i++) {
+ for (i = 0; i < max_vcpus; i++) {
dc->vcpu[i] = ULONG(dp + XEN_HYPER_OFFSET(domain_vcpu) +
i*sizeof(void *));
if (dc->vcpu[i]) XEN_HYPER_NR_VCPUS_IN_DOM(dc)++;
}
--- a/xen_hyper_defs.h
+++ b/xen_hyper_defs.h
@@ -583,6 +583,7 @@ struct xen_hyper_size_table {
long crash_xen_core_t; /* elf note v3,v4 */
long crash_xen_info_t; /* elf note v3,v4 */
long domain;
+ long domain_vcpu;
#ifdef IA64
long mm_struct;
#endif

--
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