From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39844) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XF84m-00030y-KC for qemu-devel@nongnu.org; Wed, 06 Aug 2014 16:45:16 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XF84P-0005xh-6w for qemu-devel@nongnu.org; Wed, 06 Aug 2014 16:44:48 -0400 Received: from e7.ny.us.ibm.com ([32.97.182.137]:34551) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XF84P-0005xY-1c for qemu-devel@nongnu.org; Wed, 06 Aug 2014 16:44:25 -0400 Received: from /spool/local by e7.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 6 Aug 2014 16:44:24 -0400 From: Michael Roth Date: Wed, 6 Aug 2014 15:39:31 -0500 Message-Id: <1407357598-21541-82-git-send-email-mdroth@linux.vnet.ibm.com> In-Reply-To: <1407357598-21541-1-git-send-email-mdroth@linux.vnet.ibm.com> References: <1407357598-21541-1-git-send-email-mdroth@linux.vnet.ibm.com> Subject: [Qemu-devel] [PATCH 081/108] KVM: Fix GSI number space limit List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org From: Alexander Graf KVM tells us the number of GSIs it can handle inside the kernel. That value is basically KVM_MAX_IRQ_ROUTES. However when we try to set the GSI mapping table, it checks for r = -EINVAL; if (routing.nr >= KVM_MAX_IRQ_ROUTES) goto out; erroring out even when we're only using all of the GSIs. To make sure we never hit that limit, let's reduce the number of GSIs we get from KVM by one. Cc: qemu-stable@nongnu.org Signed-off-by: Alexander Graf Signed-off-by: Paolo Bonzini (cherry picked from commit 00008418aa22700f6c49e794e79f53aeb157d10f) Signed-off-by: Michael Roth --- kvm-all.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kvm-all.c b/kvm-all.c index 82a9119..cd61496 100644 --- a/kvm-all.c +++ b/kvm-all.c @@ -948,7 +948,7 @@ void kvm_init_irq_routing(KVMState *s) { int gsi_count, i; - gsi_count = kvm_check_extension(s, KVM_CAP_IRQ_ROUTING); + gsi_count = kvm_check_extension(s, KVM_CAP_IRQ_ROUTING) - 1; if (gsi_count > 0) { unsigned int gsi_bits, i; -- 1.9.1