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| author | Vladimir Murzin <vladimir.murzin@arm.com> | 2016-09-01 15:29:03 +0100 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2016-09-08 12:53:00 +0200 |
| commit | cb96408da4e11698674abd04aeac941c1bed2038 (patch) | |
| tree | ed5ceea688d8bdc385003354782437adadb3b9aa /arch/arm64/kvm | |
| parent | cf0ba18a441410aeaf3ef97eead3a3fa5381f46f (diff) | |
| download | linux-cb96408da4e11698674abd04aeac941c1bed2038.tar.gz linux-cb96408da4e11698674abd04aeac941c1bed2038.tar.bz2 linux-cb96408da4e11698674abd04aeac941c1bed2038.zip | |
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@arm.com>
Reviewed-by: James Morse <james.morse@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: <stable@vger.kernel.org> # v4.6+
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch/arm64/kvm')
| -rw-r--r-- | arch/arm64/kvm/hyp/entry.S | 2 |
1 files changed, 2 insertions, 0 deletions
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)] |