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    Subject[PATCH 5.18 305/339] KVM: x86/mmu: Check every prev_roots in __kvm_mmu_free_obsolete_roots()
    Date
    From: Shaoqin Huang <shaoqin.huang@intel.com>

    commit cf4a8693d97a51dccf5a1557248d12d6d8be4b9e upstream.

    When freeing obsolete previous roots, check prev_roots as intended, not
    the current root.

    Signed-off-by: Shaoqin Huang <shaoqin.huang@intel.com>
    Fixes: 527d5cd7eece ("KVM: x86/mmu: Zap only obsolete roots if a root shadow page is zapped")
    Message-Id: <20220607005905.2933378-1-shaoqin.huang@intel.com>
    Cc: stable@vger.kernel.org
    Reviewed-by: Sean Christopherson <seanjc@google.com>
    Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    arch/x86/kvm/mmu/mmu.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/arch/x86/kvm/mmu/mmu.c
    +++ b/arch/x86/kvm/mmu/mmu.c
    @@ -5168,7 +5168,7 @@ static void __kvm_mmu_free_obsolete_root
    roots_to_free |= KVM_MMU_ROOT_CURRENT;

    for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++) {
    - if (is_obsolete_root(kvm, mmu->root.hpa))
    + if (is_obsolete_root(kvm, mmu->prev_roots[i].hpa))
    roots_to_free |= KVM_MMU_ROOT_PREVIOUS(i);
    }


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