X-Gene u-boot runs in EL2 mode with MMU enabled hence we might have stale EL2 tlb enteris when we enable EL2 MMU on each host CPU. This can happen on any ARM64 board running bootloader in EL2 with MMU enabled. This patch ensures that we flush all EL2 TLBs on each host CPU before enabling EL2 MMU. This is very similar to what we do for EL1 TLBs before enabling EL1 MMU. (Refer __cpu_setup() of arch/arm64/mm/proc.S) Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@xxxxxxxxxx> Signed-off-by: Anup Patel <anup.patel@xxxxxxxxxx> --- arch/arm64/kvm/hyp-init.S | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm64/kvm/hyp-init.S b/arch/arm64/kvm/hyp-init.S index d968796..c319116 100644 --- a/arch/arm64/kvm/hyp-init.S +++ b/arch/arm64/kvm/hyp-init.S @@ -80,6 +80,10 @@ __do_hyp_init: msr mair_el2, x4 isb + /* Invalidate the stale TLBs from Bootloader */ + tlbi alle2 + dsb sy + mrs x4, sctlr_el2 and x4, x4, #SCTLR_EL2_EE // preserve endianness of EL2 ldr x5, =SCTLR_EL2_FLAGS -- 1.7.9.5 _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
