clang complains about taking the address of a packed
member of a struct:
target/i386/kvm.c:1245:27: warning: taking address of packed member 'cpuid' of class or structure '' may result in an unaligned pointer value [-Waddress-of-packed-member]
c = cpuid_find_entry(&cpuid_data.cpuid, 1, 0);
^~~~~~~~~~~~~~~~
target/i386/kvm.c:1297:31: warning: taking address of packed member 'cpuid' of class or structure '' may result in an unaligned pointer value [-Waddress-of-packed-member]
c = cpuid_find_entry(&cpuid_data.cpuid, kvm_base, 0);
^~~~~~~~~~~~~~~~
The kernel's definitions of struct kvm_cpuid2 and struct
kvm_cpuid_entry2 are carefully set up with padding fields
so that there is no between-struct padding anyway, so
the QEMU_PACKED annotation is unnecessary and might result
in the compiler generating worse code. Drop it, and instead
assert at build time that there is no stray padding.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
target/i386/kvm.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index b2401d13ea7..739cf8c8ea1 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -864,7 +864,15 @@ int kvm_arch_init_vcpu(CPUState *cs)
struct {
struct kvm_cpuid2 cpuid;
struct kvm_cpuid_entry2 entries[KVM_MAX_CPUID_ENTRIES];
- } QEMU_PACKED cpuid_data;
+ } cpuid_data;
+ /*
+ * The kernel defines these structs with padding fields so there
+ * should be no extra padding in our cpuid_data struct.
+ */
+ QEMU_BUILD_BUG_ON(sizeof(cpuid_data) !=
+ sizeof(struct kvm_cpuid2) +
+ sizeof(struct kvm_cpuid_entry2) * KVM_MAX_CPUID_ENTRIES);
+
X86CPU *cpu = X86_CPU(cs);
CPUX86State *env = &cpu->env;
uint32_t limit, i, j, cpuid_i;
--
2.19.2
On 12/10/18 12:46 PM, Peter Maydell wrote: > clang complains about taking the address of a packed > member of a struct: > > target/i386/kvm.c:1245:27: warning: taking address of packed member 'cpuid' of class or structure '' may result in an unaligned pointer value [-Waddress-of-packed-member] > c = cpuid_find_entry(&cpuid_data.cpuid, 1, 0); > ^~~~~~~~~~~~~~~~ > target/i386/kvm.c:1297:31: warning: taking address of packed member 'cpuid' of class or structure '' may result in an unaligned pointer value [-Waddress-of-packed-member] > c = cpuid_find_entry(&cpuid_data.cpuid, kvm_base, 0); > ^~~~~~~~~~~~~~~~ > > The kernel's definitions of struct kvm_cpuid2 and struct > kvm_cpuid_entry2 are carefully set up with padding fields > so that there is no between-struct padding anyway, so > the QEMU_PACKED annotation is unnecessary and might result > in the compiler generating worse code. Drop it, and instead > assert at build time that there is no stray padding. > > Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> > --- > target/i386/kvm.c | 10 +++++++++- > 1 file changed, 9 insertions(+), 1 deletion(-) > > diff --git a/target/i386/kvm.c b/target/i386/kvm.c > index b2401d13ea7..739cf8c8ea1 100644 > --- a/target/i386/kvm.c > +++ b/target/i386/kvm.c > @@ -864,7 +864,15 @@ int kvm_arch_init_vcpu(CPUState *cs) > struct { > struct kvm_cpuid2 cpuid; > struct kvm_cpuid_entry2 entries[KVM_MAX_CPUID_ENTRIES]; > - } QEMU_PACKED cpuid_data; > + } cpuid_data; > + /* > + * The kernel defines these structs with padding fields so there > + * should be no extra padding in our cpuid_data struct. > + */ > + QEMU_BUILD_BUG_ON(sizeof(cpuid_data) != > + sizeof(struct kvm_cpuid2) + > + sizeof(struct kvm_cpuid_entry2) * KVM_MAX_CPUID_ENTRIES); > + > X86CPU *cpu = X86_CPU(cs); > CPUX86State *env = &cpu->env; > uint32_t limit, i, j, cpuid_i; >
On 12/10/18 5:46 AM, Peter Maydell wrote: > clang complains about taking the address of a packed > member of a struct: > > target/i386/kvm.c:1245:27: warning: taking address of packed member 'cpuid' of class or structure '' may result in an unaligned pointer value [-Waddress-of-packed-member] > c = cpuid_find_entry(&cpuid_data.cpuid, 1, 0); > ^~~~~~~~~~~~~~~~ > target/i386/kvm.c:1297:31: warning: taking address of packed member 'cpuid' of class or structure '' may result in an unaligned pointer value [-Waddress-of-packed-member] > c = cpuid_find_entry(&cpuid_data.cpuid, kvm_base, 0); > ^~~~~~~~~~~~~~~~ > > The kernel's definitions of struct kvm_cpuid2 and struct > kvm_cpuid_entry2 are carefully set up with padding fields > so that there is no between-struct padding anyway, so > the QEMU_PACKED annotation is unnecessary and might result > in the compiler generating worse code. Drop it, and instead > assert at build time that there is no stray padding. > > Signed-off-by: Peter Maydell <peter.maydell@linaro.org> > --- > target/i386/kvm.c | 10 +++++++++- > 1 file changed, 9 insertions(+), 1 deletion(-) Reviewed-by: Richard Henderson <richard.henderson@linaro.org> r~
On Mon, Dec 10, 2018 at 11:46:54AM +0000, Peter Maydell wrote: > clang complains about taking the address of a packed > member of a struct: > > target/i386/kvm.c:1245:27: warning: taking address of packed member 'cpuid' of class or structure '' may result in an unaligned pointer value [-Waddress-of-packed-member] > c = cpuid_find_entry(&cpuid_data.cpuid, 1, 0); > ^~~~~~~~~~~~~~~~ > target/i386/kvm.c:1297:31: warning: taking address of packed member 'cpuid' of class or structure '' may result in an unaligned pointer value [-Waddress-of-packed-member] > c = cpuid_find_entry(&cpuid_data.cpuid, kvm_base, 0); > ^~~~~~~~~~~~~~~~ > > The kernel's definitions of struct kvm_cpuid2 and struct > kvm_cpuid_entry2 are carefully set up with padding fields > so that there is no between-struct padding anyway, so > the QEMU_PACKED annotation is unnecessary and might result > in the compiler generating worse code. Drop it, and instead > assert at build time that there is no stray padding. > > Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Queued, thanks. -- Eduardo
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