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spapr/xive: Fix xive->fd if kvm_create_device() fails 

If the creation of the KVM XIVE device fails for some reasons, the
negative errno ends up in xive->fd, but the rest of the code assumes
that xive->fd either contains an open fd, ie. positive value, or -1.

This doesn't cause any misbehavior except kvmppc_xive_disconnect()
that will try to close(xive->fd) during rollback and likely be
rewarded with an EBADF.

Only set xive->fd with a open fd.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <159673296585.766512.15404407281299745442.stgit@bahia.lan>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Greg Kurz 2020-08-06 18:56:05 +02:00 committed by David Gibson
parent c55bcb1f47
commit 82f086b5e7
1 changed files with 5 additions and 3 deletions
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8
hw/intc/spapr_xive_kvm.c
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@ -745,6 +745,7 @@ int kvmppc_xive_connect(SpaprInterruptController *intc, uint32_t nr_servers,
size_t esb_len = (1ull << xsrc->esb_shift) * xsrc->nr_irqs;
size_t tima_len = 4ull << TM_SHIFT;
CPUState *cs;
int fd;
/*
* The KVM XIVE device already in use. This is the case when
@ -760,11 +761,12 @@ int kvmppc_xive_connect(SpaprInterruptController *intc, uint32_t nr_servers,
}
/* First, create the KVM XIVE device */
xive->fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_XIVE, false);
if (xive->fd < 0) {
error_setg_errno(errp, -xive->fd, "XIVE: error creating KVM device");
fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_XIVE, false);
if (fd < 0) {
error_setg_errno(errp, -fd, "XIVE: error creating KVM device");
return -1;
}
xive->fd = fd;
/* Tell KVM about the # of VCPUs we may have */
if (kvm_device_check_attr(xive->fd, KVM_DEV_XIVE_GRP_CTRL,