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ANDROID: KVM: arm64: s2mpu: Allow L1ENTRY_* r/o access

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Allow read-only access to L1ENTRY_ATTR and L1ENTRY_L2TABLE S2MPU
registers. This allows the host to dump the register state for debugging
purposes. It is safe because the state of the S2MPU is known to the host
anyway.

Bug: 190463801
Change-Id: I44b3633dbad3c122ce521c37813dbf2ae690a678
Signed-off-by: David Brazdil <dbrazdil@google.com>
(cherry picked from commit e56d9603a6)
Signed-off-by: Mostafa Saleh <smostafa@google.com>
Signed-off-by: Quentin Perret <qperret@google.com>
This commit is contained in:
David Brazdil
2022-04-20 14:43:46 +01:00
committed by Quentin Perret
parent 627a64b5ad
commit bc018bea9b
1 changed files with 5 additions and 0 deletions
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5
arch/arm64/kvm/hyp/nvhe/iommu/s2mpu.c
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@@ -402,6 +402,11 @@ static u32 host_mmio_reg_access_mask(size_t off, bool is_write)
return read_only & ALL_VIDS_BITMAP;
}
/* Allow reading L1ENTRY registers for debugging. */
if (off >= REG_NS_L1ENTRY_L2TABLE_ADDR(0, 0) &&
off < REG_NS_L1ENTRY_ATTR(NR_VIDS, 0))
return read_only;
/* Allow EL1 IRQ handler to read fault information. */
masked_off = off & ~REG_NS_FAULT_VID_MASK;
if ((masked_off == REG_NS_FAULT_PA_LOW(0)) ||