On 8/7/20 1:32 PM, Greg Kurz wrote:
> All callers guard these functions with an xive_in_kernel() helper. Make
> it clear that they are only to be called when the KVM XIVE device exists.
>
> Note that the check on xive is dropped in kvmppc_xive_disconnect(). It
> really cannot be NULL since it comes from set_active_intc() which only
> passes pointers to allocated objects.
>
> Signed-off-by: Greg Kurz <gr...@kaod.org>
> Reviewed-by: David Gibson <da...@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <c...@kaod.org>
> ---
> v2: Take the helper name change into account in the changelog
> ---
> hw/intc/spapr_xive_kvm.c | 35 +++++++----------------------------
> 1 file changed, 7 insertions(+), 28 deletions(-)
>
> diff --git a/hw/intc/spapr_xive_kvm.c b/hw/intc/spapr_xive_kvm.c
> index 6130882be678..82a6f99f022d 100644
> --- a/hw/intc/spapr_xive_kvm.c
> +++ b/hw/intc/spapr_xive_kvm.c
> @@ -79,10 +79,7 @@ void kvmppc_xive_cpu_set_state(XiveTCTX *tctx, Error
> **errp)
> uint64_t state[2];
> int ret;
>
> - /* The KVM XIVE device is not in use yet */
> - if (xive->fd == -1) {
> - return;
> - }
> + assert(xive->fd != -1);
>
> /* word0 and word1 of the OS ring. */
> state[0] = *((uint64_t *) &tctx->regs[TM_QW1_OS]);
> @@ -101,10 +98,7 @@ void kvmppc_xive_cpu_get_state(XiveTCTX *tctx, Error
> **errp)
> uint64_t state[2] = { 0 };
> int ret;
>
> - /* The KVM XIVE device is not in use */
> - if (xive->fd == -1) {
> - return;
> - }
> + assert(xive->fd != -1);
>
> ret = kvm_get_one_reg(tctx->cs, KVM_REG_PPC_VP_STATE, state);
> if (ret != 0) {
> @@ -156,10 +150,7 @@ void kvmppc_xive_cpu_connect(XiveTCTX *tctx, Error
> **errp)
> unsigned long vcpu_id;
> int ret;
>
> - /* The KVM XIVE device is not in use */
> - if (xive->fd == -1) {
> - return;
> - }
> + assert(xive->fd != -1);
>
> /* Check if CPU was hot unplugged and replugged. */
> if (kvm_cpu_is_enabled(tctx->cs)) {
> @@ -245,10 +236,7 @@ int kvmppc_xive_source_reset_one(XiveSource *xsrc, int
> srcno, Error **errp)
> SpaprXive *xive = SPAPR_XIVE(xsrc->xive);
> uint64_t state = 0;
>
> - /* The KVM XIVE device is not in use */
> - if (xive->fd == -1) {
> - return -ENODEV;
> - }
> + assert(xive->fd != -1);
>
> if (xive_source_irq_is_lsi(xsrc, srcno)) {
> state |= KVM_XIVE_LEVEL_SENSITIVE;
> @@ -592,10 +580,7 @@ static void kvmppc_xive_change_state_handler(void
> *opaque, int running,
>
> void kvmppc_xive_synchronize_state(SpaprXive *xive, Error **errp)
> {
> - /* The KVM XIVE device is not in use */
> - if (xive->fd == -1) {
> - return;
> - }
> + assert(xive->fd != -1);
>
> /*
> * When the VM is stopped, the sources are masked and the previous
> @@ -622,10 +607,7 @@ int kvmppc_xive_pre_save(SpaprXive *xive)
> {
> Error *local_err = NULL;
>
> - /* The KVM XIVE device is not in use */
> - if (xive->fd == -1) {
> - return 0;
> - }
> + assert(xive->fd != -1);
>
> /* EAT: there is no extra state to query from KVM */
>
> @@ -845,10 +827,7 @@ void kvmppc_xive_disconnect(SpaprInterruptController
> *intc)
> XiveSource *xsrc;
> size_t esb_len;
>
> - /* The KVM XIVE device is not in use */
> - if (!xive || xive->fd == -1) {
> - return;
> - }
> + assert(xive->fd != -1);
>
> /* Clear the KVM mapping */
> xsrc = &xive->source;
>
>
