PSTATE.PAN disables reading and/or writing to a userspace virtual address from EL1 in non-VHE or from EL2 in VHE. In non-VHE, there is no any userspace mapping at EL2, so no need to reest the PSTATE.PAN.
Signed-off-by: Dongjiu Geng <[email protected]> Signed-off-by: Haibin Zhang <[email protected]> --- arch/arm64/kvm/hyp/entry.S | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/hyp/entry.S b/arch/arm64/kvm/hyp/entry.S index 12ee62d6d410..86a7549b1b4c 100644 --- a/arch/arm64/kvm/hyp/entry.S +++ b/arch/arm64/kvm/hyp/entry.S @@ -96,8 +96,12 @@ ENTRY(__guest_exit) add x1, x1, #VCPU_CONTEXT - ALTERNATIVE(nop, SET_PSTATE_PAN(1), ARM64_HAS_PAN, CONFIG_ARM64_PAN) +alternative_if_not ARM64_HAS_VIRT_HOST_EXTN + b 2f // skip PAN at EL2 in non-VHE +alternative_else_nop_endif + ALTERNATIVE(nop, SET_PSTATE_PAN(1), ARM64_HAS_PAN, CONFIG_ARM64_PAN) +2: // Store the guest regs x2 and x3 stp x2, x3, [x1, #CPU_XREG_OFFSET(2)] -- 2.14.1
