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-rw-r--r--arch/x86/include/asm/xen/events.h11
-rw-r--r--arch/x86/pci/xen.c2
-rw-r--r--arch/x86/xen/enlighten.c21
-rw-r--r--arch/x86/xen/smp.c2
-rw-r--r--arch/x86/xen/time.c5
-rw-r--r--drivers/xen/events/events_base.c26
-rw-r--r--drivers/xen/platform-pci.c64
-rw-r--r--include/xen/xen.h3
8 files changed, 117 insertions, 17 deletions
diff --git a/arch/x86/include/asm/xen/events.h b/arch/x86/include/asm/xen/events.h
index 608a79d5a466..e6911caf5bbf 100644
--- a/arch/x86/include/asm/xen/events.h
+++ b/arch/x86/include/asm/xen/events.h
@@ -20,4 +20,15 @@ static inline int xen_irqs_disabled(struct pt_regs *regs)
/* No need for a barrier -- XCHG is a barrier on x86. */
#define xchg_xen_ulong(ptr, val) xchg((ptr), (val))
+extern int xen_have_vector_callback;
+
+/*
+ * Events delivered via platform PCI interrupts are always
+ * routed to vcpu 0 and hence cannot be rebound.
+ */
+static inline bool xen_support_evtchn_rebind(void)
+{
+ return (!xen_hvm_domain() || xen_have_vector_callback);
+}
+
#endif /* _ASM_X86_XEN_EVENTS_H */
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index a00a6c07bb6f..4ea9f290c19f 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -447,7 +447,7 @@ void __init xen_msi_init(void)
int __init pci_xen_hvm_init(void)
{
- if (!xen_feature(XENFEAT_hvm_pirqs))
+ if (!xen_have_vector_callback || !xen_feature(XENFEAT_hvm_pirqs))
return 0;
#ifdef CONFIG_ACPI
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index bdd855685403..8f1f7efa848c 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -137,6 +137,8 @@ struct shared_info xen_dummy_shared_info;
void *xen_initial_gdt;
RESERVE_BRK(shared_info_page_brk, PAGE_SIZE);
+__read_mostly int xen_have_vector_callback;
+EXPORT_SYMBOL_GPL(xen_have_vector_callback);
static int xen_cpu_up_prepare(unsigned int cpu);
static int xen_cpu_up_online(unsigned int cpu);
@@ -1521,7 +1523,10 @@ static void __init xen_pvh_early_guest_init(void)
if (!xen_feature(XENFEAT_auto_translated_physmap))
return;
- BUG_ON(!xen_feature(XENFEAT_hvm_callback_vector));
+ if (!xen_feature(XENFEAT_hvm_callback_vector))
+ return;
+
+ xen_have_vector_callback = 1;
xen_pvh_early_cpu_init(0, false);
xen_pvh_set_cr_flags(0);
@@ -1860,7 +1865,9 @@ static int xen_cpu_up_prepare(unsigned int cpu)
xen_vcpu_setup(cpu);
}
- if (xen_pv_domain() || xen_feature(XENFEAT_hvm_safe_pvclock))
+ if (xen_pv_domain() ||
+ (xen_have_vector_callback &&
+ xen_feature(XENFEAT_hvm_safe_pvclock)))
xen_setup_timer(cpu);
rc = xen_smp_intr_init(cpu);
@@ -1876,7 +1883,9 @@ static int xen_cpu_dead(unsigned int cpu)
{
xen_smp_intr_free(cpu);
- if (xen_pv_domain() || xen_feature(XENFEAT_hvm_safe_pvclock))
+ if (xen_pv_domain() ||
+ (xen_have_vector_callback &&
+ xen_feature(XENFEAT_hvm_safe_pvclock)))
xen_teardown_timer(cpu);
return 0;
@@ -1915,8 +1924,8 @@ static void __init xen_hvm_guest_init(void)
xen_panic_handler_init();
- BUG_ON(!xen_feature(XENFEAT_hvm_callback_vector));
-
+ if (xen_feature(XENFEAT_hvm_callback_vector))
+ xen_have_vector_callback = 1;
xen_hvm_smp_init();
WARN_ON(xen_cpuhp_setup());
xen_unplug_emulated_devices();
@@ -1954,7 +1963,7 @@ bool xen_hvm_need_lapic(void)
return false;
if (!xen_hvm_domain())
return false;
- if (xen_feature(XENFEAT_hvm_pirqs))
+ if (xen_feature(XENFEAT_hvm_pirqs) && xen_have_vector_callback)
return false;
return true;
}
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 311acad7dad2..137afbbd0590 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -765,6 +765,8 @@ static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
void __init xen_hvm_smp_init(void)
{
+ if (!xen_have_vector_callback)
+ return;
smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
smp_ops.cpu_die = xen_cpu_die;
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index 33d8f6a7829d..67356d29d74d 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -432,6 +432,11 @@ static void xen_hvm_setup_cpu_clockevents(void)
void __init xen_hvm_init_time_ops(void)
{
+ /* vector callback is needed otherwise we cannot receive interrupts
+ * on cpu > 0 and at this point we don't know how many cpus are
+ * available */
+ if (!xen_have_vector_callback)
+ return;
if (!xen_feature(XENFEAT_hvm_safe_pvclock)) {
printk(KERN_INFO "Xen doesn't support pvclock on HVM,"
"disable pv timer\n");
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 9ecfcdcdd6d6..d5dbdb9d24d8 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -1314,6 +1314,9 @@ static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
if (!VALID_EVTCHN(evtchn))
return -1;
+ if (!xen_support_evtchn_rebind())
+ return -1;
+
/* Send future instances of this interrupt to other vcpu. */
bind_vcpu.port = evtchn;
bind_vcpu.vcpu = xen_vcpu_nr(tcpu);
@@ -1647,15 +1650,20 @@ void xen_callback_vector(void)
{
int rc;
uint64_t callback_via;
-
- callback_via = HVM_CALLBACK_VECTOR(HYPERVISOR_CALLBACK_VECTOR);
- rc = xen_set_callback_via(callback_via);
- BUG_ON(rc);
- pr_info("Xen HVM callback vector for event delivery is enabled\n");
- /* in the restore case the vector has already been allocated */
- if (!test_bit(HYPERVISOR_CALLBACK_VECTOR, used_vectors))
- alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR,
- xen_hvm_callback_vector);
+ if (xen_have_vector_callback) {
+ callback_via = HVM_CALLBACK_VECTOR(HYPERVISOR_CALLBACK_VECTOR);
+ rc = xen_set_callback_via(callback_via);
+ if (rc) {
+ pr_err("Request for Xen HVM callback vector failed\n");
+ xen_have_vector_callback = 0;
+ return;
+ }
+ pr_info("Xen HVM callback vector for event delivery is enabled\n");
+ /* in the restore case the vector has already been allocated */
+ if (!test_bit(HYPERVISOR_CALLBACK_VECTOR, used_vectors))
+ alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR,
+ xen_hvm_callback_vector);
+ }
}
#else
void xen_callback_vector(void) {}
diff --git a/drivers/xen/platform-pci.c b/drivers/xen/platform-pci.c
index b59c9455aae1..cf9666680c8c 100644
--- a/drivers/xen/platform-pci.c
+++ b/drivers/xen/platform-pci.c
@@ -42,6 +42,7 @@
static unsigned long platform_mmio;
static unsigned long platform_mmio_alloc;
static unsigned long platform_mmiolen;
+static uint64_t callback_via;
static unsigned long alloc_xen_mmio(unsigned long len)
{
@@ -54,6 +55,51 @@ static unsigned long alloc_xen_mmio(unsigned long len)
return addr;
}
+static uint64_t get_callback_via(struct pci_dev *pdev)
+{
+ u8 pin;
+ int irq;
+
+ irq = pdev->irq;
+ if (irq < 16)
+ return irq; /* ISA IRQ */
+
+ pin = pdev->pin;
+
+ /* We don't know the GSI. Specify the PCI INTx line instead. */
+ return ((uint64_t)0x01 << 56) | /* PCI INTx identifier */
+ ((uint64_t)pci_domain_nr(pdev->bus) << 32) |
+ ((uint64_t)pdev->bus->number << 16) |
+ ((uint64_t)(pdev->devfn & 0xff) << 8) |
+ ((uint64_t)(pin - 1) & 3);
+}
+
+static irqreturn_t do_hvm_evtchn_intr(int irq, void *dev_id)
+{
+ xen_hvm_evtchn_do_upcall();
+ return IRQ_HANDLED;
+}
+
+static int xen_allocate_irq(struct pci_dev *pdev)
+{
+ return request_irq(pdev->irq, do_hvm_evtchn_intr,
+ IRQF_NOBALANCING | IRQF_TRIGGER_RISING,
+ "xen-platform-pci", pdev);
+}
+
+static int platform_pci_resume(struct pci_dev *pdev)
+{
+ int err;
+ if (xen_have_vector_callback)
+ return 0;
+ err = xen_set_callback_via(callback_via);
+ if (err) {
+ dev_err(&pdev->dev, "platform_pci_resume failure!\n");
+ return err;
+ }
+ return 0;
+}
+
static int platform_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
@@ -92,6 +138,21 @@ static int platform_pci_probe(struct pci_dev *pdev,
platform_mmio = mmio_addr;
platform_mmiolen = mmio_len;
+ if (!xen_have_vector_callback) {
+ ret = xen_allocate_irq(pdev);
+ if (ret) {
+ dev_warn(&pdev->dev, "request_irq failed err=%d\n", ret);
+ goto out;
+ }
+ callback_via = get_callback_via(pdev);
+ ret = xen_set_callback_via(callback_via);
+ if (ret) {
+ dev_warn(&pdev->dev, "Unable to set the evtchn callback "
+ "err=%d\n", ret);
+ goto out;
+ }
+ }
+
max_nr_gframes = gnttab_max_grant_frames();
grant_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes);
ret = gnttab_setup_auto_xlat_frames(grant_frames);
@@ -123,6 +184,9 @@ static struct pci_driver platform_driver = {
.name = DRV_NAME,
.probe = platform_pci_probe,
.id_table = platform_pci_tbl,
+#ifdef CONFIG_PM
+ .resume_early = platform_pci_resume,
+#endif
};
static int __init platform_pci_init(void)
diff --git a/include/xen/xen.h b/include/xen/xen.h
index f0f0252cff9a..0c0e3ef4c45d 100644
--- a/include/xen/xen.h
+++ b/include/xen/xen.h
@@ -38,7 +38,8 @@ extern enum xen_domain_type xen_domain_type;
*/
#include <xen/features.h>
#define xen_pvh_domain() (xen_pv_domain() && \
- xen_feature(XENFEAT_auto_translated_physmap))
+ xen_feature(XENFEAT_auto_translated_physmap) && \
+ xen_have_vector_callback)
#else
#define xen_pvh_domain() (0)
#endif
generated by cgit v1.2.3 (git 2.0.4) at 2024-07-12 21:22:22 +0000