adrian.bunk at movial
Jul 21, 2008, 7:58 AM
Post #1 of 1
(167 views)
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[2.6 patch] KVM: fix userspace ABI breakage
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The following part of commit 9ef621d3be56e1188300476a8102ff54f7b6793f
(KVM: Support mixed endian machines) changed on the size of a struct
that is exported to userspace:
include/linux/kvm.h:
@@ -318,14 +318,14 @@ struct kvm_trace_rec {
__u32 vcpu_id;
union {
struct {
- __u32 cycle_lo, cycle_hi;
+ __u64 cycle_u64;
__u32 extra_u32[KVM_TRC_EXTRA_MAX];
} cycle;
struct {
__u32 extra_u32[KVM_TRC_EXTRA_MAX];
} nocycle;
} u;
-};
+} __attribute__((packed));
Packing a struct was the correct idea, but it packed the wrong struct.
Signed-off-by: Adrian Bunk <adrian.bunk [at] movial>
---
857d4ddbb62bc61e44b8870cda8ea1c38c6e1905
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 0ea064c..ad11cfe 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -320,12 +320,12 @@ struct kvm_trace_rec {
struct {
__u64 cycle_u64;
__u32 extra_u32[KVM_TRC_EXTRA_MAX];
- } cycle;
+ } __attribute__((packed)) cycle;
struct {
__u32 extra_u32[KVM_TRC_EXTRA_MAX];
} nocycle;
} u;
-} __attribute__((packed));
+};
#define KVMIO 0xAE
--
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