The patch below does not apply to the 4.7-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From cb96408da4e11698674abd04aeac941c1bed2038 Mon Sep 17 00:00:00 2001
From: Vladimir Murzin <vladimir.murzin@xxxxxxx>
Date: Thu, 1 Sep 2016 15:29:03 +0100
Subject: [PATCH] arm64: KVM: VHE: reset PSTATE.PAN on entry to EL2
SCTLR_EL2.SPAN bit controls what happens with the PSTATE.PAN bit on an
exception. However, this bit has no effect on the PSTATE.PAN when
HCR_EL2.E2H or HCR_EL2.TGE is unset. Thus when VHE is used and
exception taken from a guest PSTATE.PAN bit left unchanged and we
continue with a value guest has set.
To address that always reset PSTATE.PAN on entry from EL1.
Fixes: 1f364c8c48a0 ("arm64: VHE: Add support for running Linux in EL2 mode")
Signed-off-by: Vladimir Murzin <vladimir.murzin@xxxxxxx>
Reviewed-by: James Morse <james.morse@xxxxxxx>
Acked-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v4.6+
Signed-off-by: Christoffer Dall <christoffer.dall@xxxxxxxxxx>
diff --git a/arch/arm64/kvm/hyp/entry.S b/arch/arm64/kvm/hyp/entry.S
index 3967c231eedb..b5926ee8834e 100644
--- a/arch/arm64/kvm/hyp/entry.S
+++ b/arch/arm64/kvm/hyp/entry.S
@@ -96,6 +96,8 @@ ENTRY(__guest_exit)
add x1, x1, #VCPU_CONTEXT
+ ALTERNATIVE(nop, SET_PSTATE_PAN(1), ARM64_HAS_PAN, CONFIG_ARM64_PAN)
+
// Store the guest regs x2 and x3
stp x2, x3, [x1, #CPU_XREG_OFFSET(2)]
--
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