[PULL 09/50] arm64: KVM: VHE: reset PSTATE.PAN on entry to EL2
From: Christoffer Dall <hidden>
Date: 2016-09-27 18:05:56
Also in:
kvm, kvmarm, stable
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
From: Vladimir Murzin <redacted>
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 <redacted>
Reviewed-by: James Morse <james.morse@arm.com>
Acked-by: Marc Zyngier <redacted>
Cc: <redacted> # v4.6+
Signed-off-by: Christoffer Dall <redacted>
---
arch/arm64/kvm/hyp/entry.S | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm64/kvm/hyp/entry.S b/arch/arm64/kvm/hyp/entry.S
index 3967c231..b5926ee 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)]
--
2.9.0