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authorJuergen Gross <jgross@suse.com>2023-08-09 00:04:18 +0200
committerDave Hansen <dave.hansen@linux.intel.com>2023-08-09 21:00:41 +0200
commit3b5244bef15e0ec2b51ae5ea4182e1b674d01551 (patch)
tree608fd7f71e3a35d9ade52dc7d3d16000498d154e
parentx86/apic: Provide common init infrastructure (diff)
downloadlinux-3b5244bef15e0ec2b51ae5ea4182e1b674d01551.tar.xz
linux-3b5244bef15e0ec2b51ae5ea4182e1b674d01551.zip
x86/xen/apic: Use standard apic driver mechanism for Xen PV
Instead of setting the Xen PV apic driver very early during boot, just use the standard apic driver probing by setting an appropriate x86_init.irqs.intr_mode_init callback. At the same time eliminate xen_apic_check() which has never been used. The #ifdef CONFIG_X86_LOCAL_APIC around the call of xen_init_apic() can be removed, too, as CONFIG_XEN depends on CONFIG_X86_LOCAL_APIC. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Tested-by: Michael Kelley <mikelley@microsoft.com> Tested-by: Sohil Mehta <sohil.mehta@intel.com> Tested-by: Juergen Gross <jgross@suse.com> # Xen PV (dom0 and unpriv. guest) Link: https://lore.kernel.org/lkml/aa086365-fd02-210f-67c6-5c9175c0dfee@suse.com
-rw-r--r--arch/x86/xen/apic.c11
-rw-r--r--arch/x86/xen/enlighten_pv.c4
2 files changed, 1 insertions, 14 deletions
diff --git a/arch/x86/xen/apic.c b/arch/x86/xen/apic.c
index 1838aefc632f..315ffd8d377f 100644
--- a/arch/x86/xen/apic.c
+++ b/arch/x86/xen/apic.c
@@ -158,19 +158,8 @@ static struct apic xen_pv_apic = {
.icr_write = xen_apic_icr_write,
};
-static void __init xen_apic_check(void)
-{
- apic_install_driver(&xen_pv_apic);
-}
-
void __init xen_init_apic(void)
{
x86_apic_ops.io_apic_read = xen_io_apic_read;
- /* On PV guests the APIC CPUID bit is disabled so none of the
- * routines end up executing. */
- if (!xen_initial_domain())
- apic_install_driver(&xen_pv_apic);
-
- x86_platform.apic_post_init = xen_apic_check;
}
apic_driver(xen_pv_apic);
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 93b658248d01..c393c44892ac 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -1326,7 +1326,7 @@ asmlinkage __visible void __init xen_start_kernel(struct start_info *si)
x86_init.resources.memory_setup = xen_memory_setup;
x86_init.irqs.intr_mode_select = x86_init_noop;
- x86_init.irqs.intr_mode_init = x86_init_noop;
+ x86_init.irqs.intr_mode_init = x86_64_probe_apic;
x86_init.oem.arch_setup = xen_arch_setup;
x86_init.oem.banner = xen_banner;
x86_init.hyper.init_platform = xen_pv_init_platform;
@@ -1366,12 +1366,10 @@ asmlinkage __visible void __init xen_start_kernel(struct start_info *si)
xen_init_capabilities();
-#ifdef CONFIG_X86_LOCAL_APIC
/*
* set up the basic apic ops.
*/
xen_init_apic();
-#endif
machine_ops = xen_machine_ops;