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powerpc/kvm/book3s: Add helper to walk partition scoped linux page table.

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The locking rules for walking partition scoped table is different from process
scoped table. Hence add a helper for secondary linux page table walk and also
add check whether we are holding the right locks.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200505071729.54912-10-aneesh.kumar@linux.ibm.com
This commit is contained in:
Aneesh Kumar K.V
2020-05-05 12:47:16 +05:30
committed by Michael Ellerman
parent 87013f9c60
commit 4b99412ed6
3 changed files with 20 additions and 7 deletions
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arch/powerpc/kvm/book3s_hv_nested.c
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@@ -1362,7 +1362,7 @@ static long int __kvmhv_nested_page_fault(struct kvm_run *run,
/* See if can find translation in our partition scoped tables for L1 */
pte = __pte(0);
spin_lock(&kvm->mmu_lock);
pte_p = __find_linux_pte(kvm->arch.pgtable, gpa, NULL, &shift);
pte_p = find_kvm_secondary_pte(kvm, gpa, &shift);
if (!shift)
shift = PAGE_SHIFT;
if (pte_p)