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KVM: SVM: hyper-v: placate modpost section mismatch error

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commit 45dd9bc75d upstream.

modpost reports section mismatch errors/warnings:
WARNING: modpost: vmlinux.o: section mismatch in reference: svm_hv_hardware_setup (section: .text) -> (unknown) (section: .init.data)
WARNING: modpost: vmlinux.o: section mismatch in reference: svm_hv_hardware_setup (section: .text) -> (unknown) (section: .init.data)
WARNING: modpost: vmlinux.o: section mismatch in reference: svm_hv_hardware_setup (section: .text) -> (unknown) (section: .init.data)

This "(unknown) (section: .init.data)" all refer to svm_x86_ops.

Tag svm_hv_hardware_setup() with __init to fix a modpost warning as the
non-stub implementation accesses __initdata (svm_x86_ops), i.e. would
generate a use-after-free if svm_hv_hardware_setup() were actually invoked
post-init.  The helper is only called from svm_hardware_setup(), which is
also __init, i.e. lack of __init is benign other than the modpost warning.

Fixes: 1e0c7d4075 ("KVM: SVM: hyper-v: Remote TLB flush for SVM")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Vineeth Pillai <viremana@linux.microsoft.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: kvm@vger.kernel.org
Cc: stable@vger.kernel.org
Reviewed-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20230222073315.9081-1-rdunlap@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Randy Dunlap 2023-02-21 23:33:15 -08:00 committed by Greg Kroah-Hartman
parent 033a4c0621
commit 21c95b7360
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kvm/svm/svm_onhyperv.h
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@ -48,7 +48,7 @@ static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
hve->hv_enlightenments_control.enlightened_npt_tlb = 1;
}
static inline void svm_hv_hardware_setup(void)
static inline __init void svm_hv_hardware_setup(void)
{
if (npt_enabled &&
ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) {
@ -112,7 +112,7 @@ static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
{
}
static inline void svm_hv_hardware_setup(void)
static inline __init void svm_hv_hardware_setup(void)
{
}