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author | Linus Torvalds <torvalds@linux-foundation.org> | 2022-08-14 09:28:54 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-08-14 09:28:54 -0700 |
commit | 5d6a0f4da9275f6c212de33777778673ba91241a (patch) | |
tree | 999940c4ebe31951d2555a6fde217d1a4d5fd455 /drivers/xen/events | |
parent | 96f86ff08332d88defd35c330fc6dae219b9e264 (diff) | |
parent | 5ad3134dcf5201c4d51c981e52557939256b02c7 (diff) | |
download | linux-5d6a0f4da9275f6c212de33777778673ba91241a.tar.gz linux-5d6a0f4da9275f6c212de33777778673ba91241a.tar.bz2 linux-5d6a0f4da9275f6c212de33777778673ba91241a.zip |
Merge tag 'for-linus-6.0-rc1b-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull more xen updates from Juergen Gross:
- fix the handling of the "persistent grants" feature negotiation
between Xen blkfront and Xen blkback drivers
- a cleanup of xen.config and adding xen.config to Xen section in
MAINTAINERS
- support HVMOP_set_evtchn_upcall_vector, which is more compliant to
"normal" interrupt handling than the global callback used up to now
- further small cleanups
* tag 'for-linus-6.0-rc1b-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
MAINTAINERS: add xen config fragments to XEN HYPERVISOR sections
xen: remove XEN_SCRUB_PAGES in xen.config
xen/pciback: Fix comment typo
xen/xenbus: fix return type in xenbus_file_read()
xen-blkfront: Apply 'feature_persistent' parameter when connect
xen-blkback: Apply 'feature_persistent' parameter when connect
xen-blkback: fix persistent grants negotiation
x86/xen: Add support for HVMOP_set_evtchn_upcall_vector
Diffstat (limited to 'drivers/xen/events')
-rw-r--r-- | drivers/xen/events/events_base.c | 53 |
1 files changed, 47 insertions, 6 deletions
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index 5e8321f43cbd..c443f04aaad7 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -45,6 +45,7 @@ #include <asm/irq.h> #include <asm/io_apic.h> #include <asm/i8259.h> +#include <asm/xen/cpuid.h> #include <asm/xen/pci.h> #endif #include <asm/sync_bitops.h> @@ -2184,6 +2185,7 @@ static struct irq_chip xen_percpu_chip __read_mostly = { .irq_ack = ack_dynirq, }; +#ifdef CONFIG_X86 #ifdef CONFIG_XEN_PVHVM /* Vector callbacks are better than PCI interrupts to receive event * channel notifications because we can receive vector callbacks on any @@ -2196,11 +2198,48 @@ void xen_setup_callback_vector(void) callback_via = HVM_CALLBACK_VECTOR(HYPERVISOR_CALLBACK_VECTOR); if (xen_set_callback_via(callback_via)) { pr_err("Request for Xen HVM callback vector failed\n"); - xen_have_vector_callback = 0; + xen_have_vector_callback = false; } } } +/* + * Setup per-vCPU vector-type callbacks. If this setup is unavailable, + * fallback to the global vector-type callback. + */ +static __init void xen_init_setup_upcall_vector(void) +{ + if (!xen_have_vector_callback) + return; + + if ((cpuid_eax(xen_cpuid_base() + 4) & XEN_HVM_CPUID_UPCALL_VECTOR) && + !xen_set_upcall_vector(0)) + xen_percpu_upcall = true; + else if (xen_feature(XENFEAT_hvm_callback_vector)) + xen_setup_callback_vector(); + else + xen_have_vector_callback = false; +} + +int xen_set_upcall_vector(unsigned int cpu) +{ + int rc; + xen_hvm_evtchn_upcall_vector_t op = { + .vector = HYPERVISOR_CALLBACK_VECTOR, + .vcpu = per_cpu(xen_vcpu_id, cpu), + }; + + rc = HYPERVISOR_hvm_op(HVMOP_set_evtchn_upcall_vector, &op); + if (rc) + return rc; + + /* Trick toolstack to think we are enlightened. */ + if (!cpu) + rc = xen_set_callback_via(1); + + return rc; +} + static __init void xen_alloc_callback_vector(void) { if (!xen_have_vector_callback) @@ -2211,8 +2250,11 @@ static __init void xen_alloc_callback_vector(void) } #else void xen_setup_callback_vector(void) {} +static inline void xen_init_setup_upcall_vector(void) {} +int xen_set_upcall_vector(unsigned int cpu) {} static inline void xen_alloc_callback_vector(void) {} -#endif +#endif /* CONFIG_XEN_PVHVM */ +#endif /* CONFIG_X86 */ bool xen_fifo_events = true; module_param_named(fifo_events, xen_fifo_events, bool, 0); @@ -2272,10 +2314,9 @@ void __init xen_init_IRQ(void) if (xen_initial_domain()) pci_xen_initial_domain(); } - if (xen_feature(XENFEAT_hvm_callback_vector)) { - xen_setup_callback_vector(); - xen_alloc_callback_vector(); - } + xen_init_setup_upcall_vector(); + xen_alloc_callback_vector(); + if (xen_hvm_domain()) { native_init_IRQ(); |