From e8ec032b182cd4841605de4fc297a8edffe55972 Mon Sep 17 00:00:00 2001 From: James Morse Date: Tue, 25 Apr 2017 18:02:45 +0100 Subject: [PATCH] KVM: arm64: Restore host physical timer access on hyp_panic() When KVM panics, it hurridly restores the host context and parachutes into the host's panic() code. At some point panic() touches the physical timer/counter. Unless we are an arm64 system with VHE, this traps back to EL2. If we're lucky, we panic again. Add a __timer_save_state() call to KVMs hyp_panic() path, this saves the guest registers and disables the traps for the host. Fixes: 53fd5b6487e4 ("arm64: KVM: Add panic handling") Signed-off-by: James Morse Reviewed-by: Marc Zyngier Reviewed-by: Christoffer Dall Signed-off-by: Christoffer Dall --- arch/arm64/kvm/hyp/switch.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c index aede1658aeda..e5f089de6526 100644 --- a/arch/arm64/kvm/hyp/switch.c +++ b/arch/arm64/kvm/hyp/switch.c @@ -422,6 +422,7 @@ void __hyp_text __noreturn __hyp_panic(void) vcpu = (struct kvm_vcpu *)read_sysreg(tpidr_el2); host_ctxt = kern_hyp_va(vcpu->arch.host_cpu_context); + __timer_save_state(vcpu); __deactivate_traps(vcpu); __deactivate_vm(vcpu); __sysreg_restore_host_state(host_ctxt); -- 2.20.1