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[Qemu-devel] [PATCH STABLE 7/7] kvm: work around supported cpuid ioctl()
From: |
Glauber Costa |
Subject: |
[Qemu-devel] [PATCH STABLE 7/7] kvm: work around supported cpuid ioctl() brokenness |
Date: |
Wed, 20 May 2009 15:36:18 -0300 |
From: Mark McLoughlin <address@hidden>
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 <address@hidden>
Signed-off-by: Glauber Costa <address@hidden>
---
target-i386/kvm.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 5b52de3..eb61598 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -44,6 +44,9 @@ static struct kvm_cpuid2 *try_get_cpuid(KVMState *s, int max)
cpuid = (struct kvm_cpuid2 *)qemu_mallocz(size);
cpuid->nent = max;
r = kvm_ioctl(s, KVM_GET_SUPPORTED_CPUID, cpuid);
+ if (r == 0 && cpuid->nent >= max) {
+ r = -E2BIG;
+ }
if (r < 0) {
if (r == -E2BIG) {
qemu_free(cpuid);
--
1.6.2.2