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SubjectRe: [PATCH RFC v7 01/64] KVM: Fix memslot boundary condition for large page
On Wed, Dec 14, 2022 at 01:39:53PM -0600, Michael Roth wrote:
> From: Nikunj A Dadhania <nikunj@amd.com>
>
> Aligned end boundary causes a kvm crash, handle the case.
>

Link: https://lore.kernel.org/kvm/20221202061347.1070246-8-chao.p.peng@linux.intel.com/

Chao, are you aware of this issue already?

> Signed-off-by: Nikunj A Dadhania <nikunj@amd.com>
> Signed-off-by: Michael Roth <michael.roth@amd.com>
> ---
> arch/x86/kvm/mmu/mmu.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index b1953ebc012e..b3ffc61c668c 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -7159,6 +7159,9 @@ static void kvm_update_lpage_private_shared_mixed(struct kvm *kvm,
> for (gfn = first + pages; gfn < last; gfn += pages)
> linfo_set_mixed(gfn, slot, level, false);
>
> + if (gfn == last)
> + goto out;
> +
> gfn = last;
> gfn_end = min(last + pages, slot->base_gfn + slot->npages);
> mixed = mem_attrs_mixed(kvm, slot, level, attrs, gfn, gfn_end);
> --
> 2.25.1
>


BR, Jarkko

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