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| author | Oliver Upton <oliver.upton@linux.dev> | 2022-12-02 18:51:52 +0000 |
|---|---|---|
| committer | Oliver Upton <oliver.upton@linux.dev> | 2023-01-12 21:09:20 +0000 |
| commit | ddcadb297ce5cc1cec0b0882d8b750e5e06fc9f4 (patch) | |
| tree | b753ae0cfa880cbbe16aaa130debe6258d1ec90c /arch/arm64/kvm/mmu.c | |
| parent | 9a7ad19ac804df56d3a150bcbe8f467a63821625 (diff) | |
| download | linux-ddcadb297ce5cc1cec0b0882d8b750e5e06fc9f4.tar.gz linux-ddcadb297ce5cc1cec0b0882d8b750e5e06fc9f4.tar.bz2 linux-ddcadb297ce5cc1cec0b0882d8b750e5e06fc9f4.zip | |
KVM: arm64: Ignore EAGAIN for walks outside of a fault
The page table walkers are invoked outside fault handling paths, such as
write protecting a range of memory. EAGAIN is generally used by the
walkers to retry execution due to races on a particular PTE, like taking
an access fault on a PTE being invalidated from another thread.
This early return behavior is undesirable for walkers that operate
outside a fault handler. Suppress EAGAIN and continue the walk if
operating outside a fault handler.
Link: https://lore.kernel.org/r/20221202185156.696189-3-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Diffstat (limited to 'arch/arm64/kvm/mmu.c')
| -rw-r--r-- | arch/arm64/kvm/mmu.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 3ddee4137912..edfbe85f8f8a 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -1381,7 +1381,9 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, else ret = kvm_pgtable_stage2_map(pgt, fault_ipa, vma_pagesize, __pfn_to_phys(pfn), prot, - memcache, KVM_PGTABLE_WALK_SHARED); + memcache, + KVM_PGTABLE_WALK_HANDLE_FAULT | + KVM_PGTABLE_WALK_SHARED); /* Mark the page dirty only if the fault is handled successfully */ if (writable && !ret) { |