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| author | Santosh Shukla <sashukla@nvidia.com> | 2020-10-26 16:54:07 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-11-18 19:20:15 +0100 |
| commit | 9dfbc2f82ac82eb7398ae2d0c125a52e525edbc6 (patch) | |
| tree | 8e4439bc6c99db6fd8e1858f01ee65362d498952 /virt | |
| parent | 95fda70d39555594d31311f365f99581883c2a67 (diff) | |
| download | linux-rt-9dfbc2f82ac82eb7398ae2d0c125a52e525edbc6.tar.gz | |
KVM: arm64: Force PTE mapping on fault resulting in a device mapping
[ Upstream commit 91a2c34b7d6fadc9c5d9433c620ea4c32ee7cae8 ]
VFIO allows a device driver to resolve a fault by mapping a MMIO
range. This can be subsequently result in user_mem_abort() to
try and compute a huge mapping based on the MMIO pfn, which is
a sure recipe for things to go wrong.
Instead, force a PTE mapping when the pfn faulted in has a device
mapping.
Fixes: 6d674e28f642 ("KVM: arm/arm64: Properly handle faulting of device mappings")
Suggested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Santosh Shukla <sashukla@nvidia.com>
[maz: rewritten commit message]
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/1603711447-11998-2-git-send-email-sashukla@nvidia.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/arm/mmu.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c index 8700402f3000..03a586ab6d27 100644 --- a/virt/kvm/arm/mmu.c +++ b/virt/kvm/arm/mmu.c @@ -1756,6 +1756,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, if (kvm_is_device_pfn(pfn)) { mem_type = PAGE_S2_DEVICE; flags |= KVM_S2PTE_FLAG_IS_IOMAP; + force_pte = true; } else if (logging_active) { /* * Faults on pages in a memslot with logging enabled |