From: Paolo Bonzini <pbonzini@redhat.com>
Date: Fri, 28 Mar 2014 19:41:51 +0000 (+0100)
Subject: KVM: ioapic: try to recover if pending_eoi goes out of range
X-Git-Tag: omap-for-v3.16/pm-signed~107^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4009b2499eee26c7f413073300d124a37765dfca;p=pandora-kernel.git

KVM: ioapic: try to recover if pending_eoi goes out of range

The RTC tracking code tracks the cardinality of rtc_status.dest_map
into rtc_status.pending_eoi.  It has some WARN_ONs that trigger if
pending_eoi ever becomes negative; however, these do not do anything
to recover, and it bad things will happen soon after they trigger.

When the next RTC interrupt is triggered, rtc_check_coalesced() will
return false, but ioapic_service will find pending_eoi != 0 and
do a BUG_ON.  To avoid this, should pending_eoi ever be nonzero,
call kvm_rtc_eoi_tracking_restore_all to recompute a correct
dest_map and pending_eoi.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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