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[Qemu-devel] [PULL 34/38] spapr: check for the activation of the KVM IRQ
From: |
David Gibson |
Subject: |
[Qemu-devel] [PULL 34/38] spapr: check for the activation of the KVM IRQ device |
Date: |
Tue, 21 May 2019 16:29:20 +1000 |
From: Cédric Le Goater <address@hidden>
The activation of the KVM IRQ device depends on the interrupt mode
chosen at CAS time by the machine and some methods used at reset or by
the migration need to be protected.
Signed-off-by: Cédric Le Goater <address@hidden>
Reviewed-by: David Gibson <address@hidden>
Signed-off-by: Cédric Le Goater <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: David Gibson <address@hidden>
---
hw/intc/spapr_xive_kvm.c | 33 +++++++++++++++++++++++++++++++++
hw/intc/xics_kvm.c | 31 ++++++++++++++++++++++++++++++-
2 files changed, 63 insertions(+), 1 deletion(-)
diff --git a/hw/intc/spapr_xive_kvm.c b/hw/intc/spapr_xive_kvm.c
index 259cd1db95..078d18d775 100644
--- a/hw/intc/spapr_xive_kvm.c
+++ b/hw/intc/spapr_xive_kvm.c
@@ -90,9 +90,15 @@ static void kvmppc_xive_cpu_set_state(XiveTCTX *tctx, Error
**errp)
void kvmppc_xive_cpu_get_state(XiveTCTX *tctx, Error **errp)
{
+ SpaprXive *xive = SPAPR_MACHINE(qdev_get_machine())->xive;
uint64_t state[2] = { 0 };
int ret;
+ /* The KVM XIVE device is not in use */
+ if (xive->fd == -1) {
+ return;
+ }
+
ret = kvm_get_one_reg(tctx->cs, KVM_REG_PPC_VP_STATE, state);
if (ret != 0) {
error_setg_errno(errp, errno,
@@ -143,6 +149,11 @@ 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;
+ }
+
/* Check if CPU was hot unplugged and replugged. */
if (kvm_cpu_is_enabled(tctx->cs)) {
return;
@@ -219,6 +230,11 @@ void 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;
+ }
+
if (xive_source_irq_is_lsi(xsrc, srcno)) {
state |= KVM_XIVE_LEVEL_SENSITIVE;
if (xsrc->status[srcno] & XIVE_STATUS_ASSERTED) {
@@ -319,9 +335,13 @@ static void kvmppc_xive_source_get_state(XiveSource *xsrc)
void kvmppc_xive_source_set_irq(void *opaque, int srcno, int val)
{
XiveSource *xsrc = opaque;
+ SpaprXive *xive = SPAPR_XIVE(xsrc->xive);
struct kvm_irq_level args;
int rc;
+ /* The KVM XIVE device should be in use */
+ assert(xive->fd != -1);
+
args.irq = srcno;
if (!xive_source_irq_is_lsi(xsrc, srcno)) {
if (!val) {
@@ -546,6 +566,11 @@ 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;
+ }
+
/*
* When the VM is stopped, the sources are masked and the previous
* state is saved in anticipation of a migration. We should not
@@ -571,6 +596,11 @@ 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;
+ }
+
/* EAT: there is no extra state to query from KVM */
/* ENDT */
@@ -595,6 +625,9 @@ int kvmppc_xive_post_load(SpaprXive *xive, int version_id)
CPUState *cs;
int i;
+ /* The KVM XIVE device should be in use */
+ assert(xive->fd != -1);
+
/* Restore the ENDT first. The targetting depends on it. */
for (i = 0; i < xive->nr_ends; i++) {
if (!xive_end_is_valid(&xive->endt[i])) {
diff --git a/hw/intc/xics_kvm.c b/hw/intc/xics_kvm.c
index 1185846ff1..12bd5190cf 100644
--- a/hw/intc/xics_kvm.c
+++ b/hw/intc/xics_kvm.c
@@ -69,6 +69,11 @@ void icp_get_kvm_state(ICPState *icp)
uint64_t state;
int ret;
+ /* The KVM XICS device is not in use */
+ if (kernel_xics_fd == -1) {
+ return;
+ }
+
/* ICP for this CPU thread is not in use, exiting */
if (!icp->cs) {
return;
@@ -105,6 +110,11 @@ int icp_set_kvm_state(ICPState *icp)
uint64_t state;
int ret;
+ /* The KVM XICS device is not in use */
+ if (kernel_xics_fd == -1) {
+ return 0;
+ }
+
/* ICP for this CPU thread is not in use, exiting */
if (!icp->cs) {
return 0;
@@ -133,8 +143,9 @@ void icp_kvm_realize(DeviceState *dev, Error **errp)
unsigned long vcpu_id;
int ret;
+ /* The KVM XICS device is not in use */
if (kernel_xics_fd == -1) {
- abort();
+ return;
}
cs = icp->cs;
@@ -170,6 +181,11 @@ void ics_get_kvm_state(ICSState *ics)
uint64_t state;
int i;
+ /* The KVM XICS device is not in use */
+ if (kernel_xics_fd == -1) {
+ return;
+ }
+
for (i = 0; i < ics->nr_irqs; i++) {
ICSIRQState *irq = &ics->irqs[i];
@@ -230,6 +246,11 @@ int ics_set_kvm_state_one(ICSState *ics, int srcno)
ICSIRQState *irq = &ics->irqs[srcno];
int ret;
+ /* The KVM XICS device is not in use */
+ if (kernel_xics_fd == -1) {
+ return 0;
+ }
+
state = irq->server;
state |= (uint64_t)(irq->saved_priority & KVM_XICS_PRIORITY_MASK)
<< KVM_XICS_PRIORITY_SHIFT;
@@ -269,6 +290,11 @@ int ics_set_kvm_state(ICSState *ics)
{
int i;
+ /* The KVM XICS device is not in use */
+ if (kernel_xics_fd == -1) {
+ return 0;
+ }
+
for (i = 0; i < ics->nr_irqs; i++) {
int ret;
@@ -286,6 +312,9 @@ void ics_kvm_set_irq(ICSState *ics, int srcno, int val)
struct kvm_irq_level args;
int rc;
+ /* The KVM XICS device should be in use */
+ assert(kernel_xics_fd != -1);
+
args.irq = srcno + ics->offset;
if (ics->irqs[srcno].flags & XICS_FLAGS_IRQ_MSI) {
if (!val) {
--
2.21.0
- [Qemu-devel] [PULL 31/38] spapr/xive: activate KVM support, (continued)
- [Qemu-devel] [PULL 31/38] spapr/xive: activate KVM support, David Gibson, 2019/05/21
- [Qemu-devel] [PULL 32/38] sysbus: add a sysbus_mmio_unmap() helper, David Gibson, 2019/05/21
- [Qemu-devel] [PULL 25/38] linux-headers: Update linux headers to 5.2-rc1, David Gibson, 2019/05/21
- [Qemu-devel] [PULL 28/38] spapr/xive: add state synchronization with KVM, David Gibson, 2019/05/21
- [Qemu-devel] [PULL 26/38] spapr/xive: add KVM support, David Gibson, 2019/05/21
- [Qemu-devel] [PULL 23/38] spapr: Fix phb_placement backwards compatibility, David Gibson, 2019/05/21
- [Qemu-devel] [PULL 33/38] spapr: introduce routines to delete the KVM IRQ device, David Gibson, 2019/05/21
- [Qemu-devel] [PULL 36/38] spapr/irq: initialize the IRQ device only once, David Gibson, 2019/05/21
- [Qemu-devel] [PULL 37/38] ppc/xics: fix irq priority in ics_set_irq_type(), David Gibson, 2019/05/21
- [Qemu-devel] [PULL 38/38] spapr/irq: add KVM support to the 'dual' machine, David Gibson, 2019/05/21
- [Qemu-devel] [PULL 34/38] spapr: check for the activation of the KVM IRQ device,
David Gibson <=
- [Qemu-devel] [PULL 35/38] spapr/irq: introduce a spapr_irq_init_device() helper, David Gibson, 2019/05/21
- Re: [Qemu-devel] [PULL 00/38] ppc-for-4.1 queue 20190521, no-reply, 2019/05/21
- Re: [Qemu-devel] [PULL 00/38] ppc-for-4.1 queue 20190521, Peter Maydell, 2019/05/21