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[Qemu-devel] [PATCH v2] kvm: work around supported cpuid ioctl() brokenn
From: |
Mark McLoughlin |
Subject: |
[Qemu-devel] [PATCH v2] kvm: work around supported cpuid ioctl() brokenness |
Date: |
Tue, 19 May 2009 18:55:21 +0100 |
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>
---
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 fe67eed..7cdcf31 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -45,6 +45,9 @@ 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);
--
1.6.0.6