x86/bugs: Move the X86_FEATURE_USE_IBPB check into callers

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indirect_branch_prediction_barrier() only performs the MSR write if
X86_FEATURE_USE_IBPB is set, using alternative_msr_write(). In
preparation for removing X86_FEATURE_USE_IBPB, move the feature check
into the callers so that they can be addressed one-by-one, and use
X86_FEATURE_IBPB instead to guard the MSR write.

Signed-off-by: Yosry Ahmed <yosry.ahmed@linux.dev>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Acked-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20250227012712.3193063-2-yosry.ahmed@linux.dev

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Yosry Ahmed 2025-02-27 01:27:07 +00:00 • committed by Ingo Molnar

parent 8442df2b49

commit 549435aab4

6 changed files with 12 additions and 8 deletions

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2

arch/x86/include/asm/nospec-branch.h

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arch/x86/kernel/cpu/bugs.c

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arch/x86/kvm/svm/svm.c

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arch/x86/kvm/vmx/nested.c

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arch/x86/kvm/vmx/vmx.c

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arch/x86/mm/tlb.c

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