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KVM: allow KVM_BUG/KVM_BUG_ON to handle 64-bit cond

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Current KVM_BUG and KVM_BUG_ON assume that 'cond' passed from callers is
32-bit as it casts 'cond' to the type of int. This will be wrong if 'cond'
provided by a caller is 64-bit, e.g. an error code of 0xc0000d0300000000
will be converted to 0, which is not expected.

Improves the implementation by using bool in KVM_BUG and KVM_BUG_ON.
'bool' is preferred to 'int' as __ret is essentially used as a boolean
and coding-stytle.rst documents that use of bool is encouraged to improve
readability and is often a better option than 'int' for storing boolean
values.

Fixes: 0b8f11737c ("KVM: Add infrastructure and macro to mark VM as bugged")
Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Reviewed-by: Mingwei Zhang <mizhang@google.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20230307135233.54684-1-wei.w.wang@intel.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Wei Wang 2023-03-07 21:52:33 +08:00 committed by Sean Christopherson
parent 76021e96d7
commit c9d6015486
1 changed files with 2 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

4
include/linux/kvm_host.h
View file

@ -849,7 +849,7 @@ static inline void kvm_vm_bugged(struct kvm *kvm)
#define KVM_BUG(cond, kvm, fmt...) \ #define KVM_BUG(cond, kvm, fmt...) \
({ \ ({ \
int __ret = (cond); \ bool __ret = !!(cond); \
\ \
if (WARN_ONCE(__ret && !(kvm)->vm_bugged, fmt)) \ if (WARN_ONCE(__ret && !(kvm)->vm_bugged, fmt)) \
kvm_vm_bugged(kvm); \ kvm_vm_bugged(kvm); \
@ -858,7 +858,7 @@ static inline void kvm_vm_bugged(struct kvm *kvm)
#define KVM_BUG_ON(cond, kvm) \ #define KVM_BUG_ON(cond, kvm) \
({ \ ({ \
int __ret = (cond); \ bool __ret = !!(cond); \
\ \
if (WARN_ON_ONCE(__ret && !(kvm)->vm_bugged)) \ if (WARN_ON_ONCE(__ret && !(kvm)->vm_bugged)) \
kvm_vm_bugged(kvm); \ kvm_vm_bugged(kvm); \