KVM: SVM: Add a helper to allocate and initialize permissions bitmaps

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Add a helper to allocate and initialize an MSR or I/O permissions map, as
the logic is identical between the two map types, the only difference is
the size of the bitmap.  Opportunistically add a comment to explain why
the bitmaps are initialized with 0xff, e.g. instead of the more common
zero-initialized behavior, which is the main motivation for deduplicating
the code.

No functional change intended.

Link: https://lore.kernel.org/r/20250610225737.156318-31-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Sean Christopherson 2025-06-10 15:57:35 -07:00

parent 54f1c77061

commit 73be81b3bb

2 changed files with 22 additions and 17 deletions

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31

arch/x86/kvm/svm/svm.c

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8

arch/x86/kvm/svm/svm.h

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