KVM_GET_SUPPORTED_CPUID has been known to fail to return -E2BIG
when it runs out of entries. Detect this by always trying again
with a bigger table if the ioctl() fills the table.
Signed-off-by: Mark McLoughlin <mar...@redhat.com>
---
kvm/libkvm/libkvm-x86.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/kvm/libkvm/libkvm-x86.c b/kvm/libkvm/libkvm-x86.c
index a2f6320..4f9539a 100644
--- a/kvm/libkvm/libkvm-x86.c
+++ b/kvm/libkvm/libkvm-x86.c
@@ -575,6 +575,8 @@ static struct kvm_cpuid2 *try_get_cpuid(kvm_context_t kvm,
int max)
r = ioctl(kvm->fd, KVM_GET_SUPPORTED_CPUID, cpuid);
if (r == -1)
r = -errno;
+ else if (r == 0 && cpuid->nent >= max)
+ r = -E2BIG;
if (r < 0) {
if (r == -E2BIG) {
free(cpuid);
--
1.6.0.6
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