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UPSTREAM: KVM: arm64: Handle host stage-2 faults from 32-bit EL0

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When pKVM is enabled, host memory accesses are translated by an identity
mapping at stage-2, which is populated lazily in response to synchronous
exceptions from 64-bit EL1 and EL0.

Extend this handling to cover exceptions originating from 32-bit EL0 as
well. Although these are very unlikely to occur in practice, as the
kernel typically ensures that user pages are initialised before mapping
them in, drivers could still map previously untouched device pages into
userspace and expect things to work rather than panic the system.

Cc: Quentin Perret <qperret@google.com>
Cc: Marc Zyngier <maz@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220427171332.13635-1-will@kernel.org
(cherry picked from commit 2a50fc5fd0)
Signed-off-by: Will Deacon <willdeacon@google.com>
Bug: 233587962
Bug: 233588291
Change-Id: Ibc6ffba7e8b01f940dbe39aefee10be1a7135b5e
This commit is contained in:
Will Deacon
2022-04-27 18:13:32 +01:00
committed by Will Deacon
parent 462ab06b7e
commit 3f9f9dda5f
1 changed files with 8 additions and 8 deletions
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16
arch/arm64/kvm/hyp/nvhe/host.S
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@@ -198,15 +198,15 @@ SYM_CODE_START(__kvm_hyp_host_vector)
invalid_host_el2_vect // FIQ EL2h
invalid_host_el2_vect // Error EL2h
host_el1_sync_vect // Synchronous 64-bit EL1
invalid_host_el1_vect // IRQ 64-bit EL1
invalid_host_el1_vect // FIQ 64-bit EL1
invalid_host_el1_vect // Error 64-bit EL1
host_el1_sync_vect // Synchronous 64-bit EL1/EL0
invalid_host_el1_vect // IRQ 64-bit EL1/EL0
invalid_host_el1_vect // FIQ 64-bit EL1/EL0
invalid_host_el1_vect // Error 64-bit EL1/EL0
invalid_host_el1_vect // Synchronous 32-bit EL1
invalid_host_el1_vect // IRQ 32-bit EL1
invalid_host_el1_vect // FIQ 32-bit EL1
invalid_host_el1_vect // Error 32-bit EL1
host_el1_sync_vect // Synchronous 32-bit EL1/EL0
invalid_host_el1_vect // IRQ 32-bit EL1/EL0
invalid_host_el1_vect // FIQ 32-bit EL1/EL0
invalid_host_el1_vect // Error 32-bit EL1/EL0
SYM_CODE_END(__kvm_hyp_host_vector)
/*