diff options
| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2020-03-25 12:12:59 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-03-31 10:51:45 -0400 |
| commit | 855c7e9b9c2c39fb8d108ac70d0eed530f80a2aa (patch) | |
| tree | 1b3419b6d27fe9f655ad6856713268b56d2e0f58 | |
| parent | 842f4be95899df22b5843ba1a7c8cf37e831a6e8 (diff) | |
| download | linux-855c7e9b9c2c39fb8d108ac70d0eed530f80a2aa.tar.bz2 | |
KVM: x86: Fix BUILD_BUG() in __cpuid_entry_get_reg() w/ CONFIG_UBSAN=y
Take the target reg in __cpuid_entry_get_reg() instead of a pointer to a
struct cpuid_reg. When building with -fsanitize=alignment (enabled by
CONFIG_UBSAN=y), some versions of gcc get tripped up on the pointer and
trigger the BUILD_BUG().
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Fixes: d8577a4c238f8 ("KVM: x86: Do host CPUID at load time to mask KVM cpu caps")
Fixes: 4c61534aaae2a ("KVM: x86: Introduce cpuid_entry_{get,has}() accessors")
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200325191259.23559-1-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 2 | ||||
| -rw-r--r-- | arch/x86/kvm/cpuid.h | 8 |
2 files changed, 5 insertions, 5 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index b18c31a26cc2..901cd1fdecd9 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -269,7 +269,7 @@ static __always_inline void kvm_cpu_cap_mask(enum cpuid_leafs leaf, u32 mask) cpuid_count(cpuid.function, cpuid.index, &entry.eax, &entry.ebx, &entry.ecx, &entry.edx); - kvm_cpu_caps[leaf] &= *__cpuid_entry_get_reg(&entry, &cpuid); + kvm_cpu_caps[leaf] &= *__cpuid_entry_get_reg(&entry, cpuid.reg); } void kvm_set_cpu_caps(void) diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h index 23b4cd1ad986..63a70f6a3df3 100644 --- a/arch/x86/kvm/cpuid.h +++ b/arch/x86/kvm/cpuid.h @@ -99,9 +99,9 @@ static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned int x86_featu } static __always_inline u32 *__cpuid_entry_get_reg(struct kvm_cpuid_entry2 *entry, - const struct cpuid_reg *cpuid) + u32 reg) { - switch (cpuid->reg) { + switch (reg) { case CPUID_EAX: return &entry->eax; case CPUID_EBX: @@ -121,7 +121,7 @@ static __always_inline u32 *cpuid_entry_get_reg(struct kvm_cpuid_entry2 *entry, { const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature); - return __cpuid_entry_get_reg(entry, &cpuid); + return __cpuid_entry_get_reg(entry, cpuid.reg); } static __always_inline u32 cpuid_entry_get(struct kvm_cpuid_entry2 *entry, @@ -189,7 +189,7 @@ static __always_inline u32 *guest_cpuid_get_register(struct kvm_vcpu *vcpu, if (!entry) return NULL; - return __cpuid_entry_get_reg(entry, &cpuid); + return __cpuid_entry_get_reg(entry, cpuid.reg); } static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, |