diff options
| author | Juergen Gross <jgross@suse.com> | 2021-10-28 10:27:48 +0300 |
|---|---|---|
| committer | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2021-11-02 16:03:43 +0300 |
| commit | e453f872b72fb93e54ab0f3a07eeeacc2215fd15 (patch) | |
| tree | 20df57b437bbe83b8ebd6798c1f174f1929a5d98 /arch/x86/xen/enlighten.c | |
| parent | 12ad6cfc09a5bbe59ba9bae3a103bd3c7130c7c2 (diff) | |
| download | linux-e453f872b72fb93e54ab0f3a07eeeacc2215fd15.tar.xz | |
x86/xen: switch initial pvops IRQ functions to dummy ones
The initial pvops functions handling irq flags will only ever be called
before interrupts are being enabled.
So switch them to be dummy functions:
- xen_save_fl() can always return 0
- xen_irq_disable() is a nop
- xen_irq_enable() can BUG()
Add some generic paravirt functions for that purpose.
Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20211028072748.29862-3-jgross@suse.com
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'arch/x86/xen/enlighten.c')
| -rw-r--r-- | arch/x86/xen/enlighten.c | 19 |
1 files changed, 2 insertions, 17 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 006b4a814fac..30c6e986a6cd 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -31,25 +31,10 @@ EXPORT_SYMBOL_GPL(hypercall_page); * Pointer to the xen_vcpu_info structure or * &HYPERVISOR_shared_info->vcpu_info[cpu]. See xen_hvm_init_shared_info * and xen_vcpu_setup for details. By default it points to share_info->vcpu_info - * but if the hypervisor supports VCPUOP_register_vcpu_info then it can point - * to xen_vcpu_info. The pointer is used in __xen_evtchn_do_upcall to - * acknowledge pending events. - * Also more subtly it is used by the patched version of irq enable/disable - * e.g. xen_irq_enable_direct and xen_iret in PV mode. - * - * The desire to be able to do those mask/unmask operations as a single - * instruction by using the per-cpu offset held in %gs is the real reason - * vcpu info is in a per-cpu pointer and the original reason for this - * hypercall. - * + * but during boot it is switched to point to xen_vcpu_info. + * The pointer is used in __xen_evtchn_do_upcall to acknowledge pending events. */ DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); - -/* - * Per CPU pages used if hypervisor supports VCPUOP_register_vcpu_info - * hypercall. This can be used both in PV and PVHVM mode. The structure - * overrides the default per_cpu(xen_vcpu, cpu) value. - */ DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info); /* Linux <-> Xen vCPU id mapping */ |