KVM: x86: Fix BUILD_BUG() in __cpuid_entry_get_reg() w/ CONFIG_UBSAN=y

Browse source

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: d8577a4c23 ("KVM: x86: Do host CPUID at load time to mask KVM cpu caps")
Fixes: 4c61534aaa ("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>

...

This commit is contained in:

Sean Christopherson 2020-03-25 12:12:59 -07:00 • committed by Paolo Bonzini

parent 842f4be958

commit 855c7e9b9c

2 changed files with 5 additions and 5 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

2

arch/x86/kvm/cpuid.c

View file

8

arch/x86/kvm/cpuid.h

View file