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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2020-04-28 11:38:22 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-06-11 15:14:32 +0200 |
| commit | a0bb51f2638e0810c347024679239fd10a8f7990 (patch) | |
| tree | cc9493e85ed25569561e8825adfe088fd97b623f /drivers/xen/events | |
| parent | fbaed278a3cc72a46aadae667b8c6754b78640a6 (diff) | |
| download | linux-a0bb51f2638e0810c347024679239fd10a8f7990.tar.gz | |
x86/xen: Split HVM vector callback setup and interrupt gate allocation
As a preparatory change for making alloc_intr_gate() __init split xen_callback_vector() into callback vector setup via hypercall (xen_setup_callback_vector()) and interrupt gate allocation (xen_alloc_callback_vector()). xen_setup_callback_vector() is being called twice: on init and upon system resume from xen_hvm_post_suspend(). alloc_intr_gate() only needs to be called once. Suggested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20200428093824.1451532-2-vkuznets@redhat.com
Diffstat (limited to 'drivers/xen/events')
| -rw-r--r-- | drivers/xen/events/events_base.c | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index 3a791c8485d0..eb35c3cda9a6 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -1639,26 +1639,30 @@ EXPORT_SYMBOL_GPL(xen_set_callback_via); /* Vector callbacks are better than PCI interrupts to receive event * channel notifications because we can receive vector callbacks on any * vcpu and we don't need PCI support or APIC interactions. */ -void xen_callback_vector(void) +void xen_setup_callback_vector(void) { - int rc; uint64_t callback_via; if (xen_have_vector_callback) { callback_via = HVM_CALLBACK_VECTOR(HYPERVISOR_CALLBACK_VECTOR); - rc = xen_set_callback_via(callback_via); - if (rc) { + if (xen_set_callback_via(callback_via)) { pr_err("Request for Xen HVM callback vector failed\n"); xen_have_vector_callback = 0; - return; } - pr_info_once("Xen HVM callback vector for event delivery is enabled\n"); - alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, - xen_hvm_callback_vector); } } + +static __init void xen_alloc_callback_vector(void) +{ + if (!xen_have_vector_callback) + return; + + pr_info("Xen HVM callback vector for event delivery is enabled\n"); + alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, xen_hvm_callback_vector); +} #else -void xen_callback_vector(void) {} +void xen_setup_callback_vector(void) {} +static inline void xen_alloc_callback_vector(void) {} #endif #undef MODULE_PARAM_PREFIX @@ -1692,8 +1696,10 @@ void __init xen_init_IRQ(void) if (xen_initial_domain()) pci_xen_initial_domain(); } - if (xen_feature(XENFEAT_hvm_callback_vector)) - xen_callback_vector(); + if (xen_feature(XENFEAT_hvm_callback_vector)) { + xen_setup_callback_vector(); + xen_alloc_callback_vector(); + } if (xen_hvm_domain()) { native_init_IRQ(); |