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KVM: arm64: timers: Don't BUG() on unhandled timer trap

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Although not handling a trap is a pretty bad situation to be in,
panicing the kernel isn't useful and provides no valuable
information to help debugging the situation.

Instead, dump the encoding of the unhandled sysreg, and inject
an UNDEF in the guest. At least, this gives a user an opportunity
to report the issue with some information to help debugging it.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230112123829.458912-4-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Marc Zyngier
2023-01-12 12:38:29 +00:00
committed by Oliver Upton
parent fc6ee952cf
commit ba82e06cf7
1 changed files with 3 additions and 1 deletions
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4
arch/arm64/kvm/sys_regs.c
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@@ -1049,7 +1049,9 @@ static bool access_arch_timer(struct kvm_vcpu *vcpu,
treg = TIMER_REG_CVAL;
break;
default:
BUG();
print_sys_reg_msg(p, "%s", "Unhandled trapped timer register");
kvm_inject_undefined(vcpu);
return false;
}
if (p->is_write)