diff options
| author | Marc Zyngier <marc.zyngier@arm.com> | 2017-04-20 18:02:21 +0300 |
|---|---|---|
| committer | Christoffer Dall <cdall@linaro.org> | 2017-04-20 21:17:57 +0300 |
| commit | 1edb632133efb6226b6bef3e7d9fa8c7134ac4e2 (patch) | |
| tree | 8451658c150adde8d165549ab5d2f3249344e6b1 /arch/arm/kvm | |
| parent | 5b560525add78e15fd5b75e5d03ea1ff988e6747 (diff) | |
| download | linux-1edb632133efb6226b6bef3e7d9fa8c7134ac4e2.tar.xz | |
ARM: KVM: Fix idmap stub entry when running Thumb-2 code
When entering the hyp stub implemented in the idmap, we try to
be mindful of the fact that we could be running a Thumb-2 kernel
by adding 1 to the address we compute. Unfortunately, the assembler
also knows about this trick, and has already generated an address
that has bit 0 set in the litteral pool.
Our superfluous correction ends up confusing the CPU entierely,
as we now branch to the stub in ARM mode instead of Thumb, and on
a possibly unaligned address for good measure. From that point,
nothing really good happens.
The obvious fix in to remove this stupid target PC correction.
Fixes: 6bebcecb6c5b ("ARM: KVM: Allow the main HYP code to use the init hyp stub implementation")
Reported-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
Diffstat (limited to 'arch/arm/kvm')
| -rw-r--r-- | arch/arm/kvm/hyp/hyp-entry.S | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/arm/kvm/hyp/hyp-entry.S b/arch/arm/kvm/hyp/hyp-entry.S index a35baa81fd23..95a2faefc070 100644 --- a/arch/arm/kvm/hyp/hyp-entry.S +++ b/arch/arm/kvm/hyp/hyp-entry.S @@ -144,7 +144,6 @@ hyp_hvc: ldr r1, [r1] ldr ip, =__kvm_handle_stub_hvc sub ip, ip, r1 -THUMB( add ip, ip, #1) pop {r1} bx ip |