[PATCH v3] kvm: Check if smp_cpus exceeds max cpus supported by kvm

[riegamaths@xxxxxxxxx]

From: Dunrong Huang <riegamaths@xxxxxxxxx>

Add a helper function for fetching max cpus supported by kvm.

Make QEMU exit with an error message if smp_cpus exceeds limit
of VCPU count retrieved by invoking this helper function.

Signed-off-by: Dunrong Huang <riegamaths@xxxxxxxxx>
---
v1 -> v2:
   * Fix indentation(thanks to Stefan Hajnoczi for his review)
   
v2 -> v3(Thanks to Peter Maydell for this hint)
   * Add a comment for helper function
   * Use "goto err" instead of "exit(1)"
   
 kvm-all.c |   29 +++++++++++++++++++++++++++++
 1 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/kvm-all.c b/kvm-all.c
index 2148b20..bf64761 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1207,6 +1207,26 @@ static int kvm_irqchip_create(KVMState *s)
     return 0;
 }
 
+static int kvm_max_vcpus(KVMState *s)
+{
+    int ret;
+
+    /* Find number of supported CPUs using the recommended
+     * procedure from the kernel API documentation to cope with
+     * older kernels that may be missing capabilities.
+     */
+    ret = kvm_check_extension(s, KVM_CAP_MAX_VCPUS);
+    if (ret) {
+        return ret;
+    }
+    ret = kvm_check_extension(s, KVM_CAP_NR_VCPUS);
+    if (ret) {
+        return ret;
+    }
+
+    return 4;
+}
+
 int kvm_init(void)
 {
     static const char upgrade_note[] =
@@ -1216,6 +1236,7 @@ int kvm_init(void)
     const KVMCapabilityInfo *missing_cap;
     int ret;
     int i;
+    int max_vcpus;
 
     s = g_malloc0(sizeof(KVMState));
 
@@ -1256,6 +1277,14 @@ int kvm_init(void)
         goto err;
     }
 
+    max_vcpus = kvm_max_vcpus(s);
+    if (smp_cpus > max_vcpus) {
+        ret = -EINVAL;
+        fprintf(stderr, "Number of SMP cpus requested (%d) exceeds max cpus "
+                "supported by KVM (%d)\n", smp_cpus, max_vcpus);
+        goto err;
+    }
+
     s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
     if (s->vmfd < 0) {
 #ifdef TARGET_S390X
-- 
1.7.8.6

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