[tip: x86/apic] x86/apic: Convert other overrides to apic_update_callback()

[tip-bot2 for Thomas Gleixner]

The following commit has been merged into the x86/apic branch of tip:

Commit-ID:     d6f361ea706710f8d582bb176793b779a3b8b2ca
Gitweb:        https://git.kernel.org/tip/d6f361ea706710f8d582bb176793b779a3b8b2ca
Author:        Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate:    Tue, 08 Aug 2023 15:04:20 -07:00
Committer:     Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
CommitterDate: Wed, 09 Aug 2023 12:00:46 -07:00

x86/apic: Convert other overrides to apic_update_callback()

Convert all places which just assign a new function directly to the apic
callback to use apic_update_callback() which prepares for using static
calls.

Mark snp_set_wakeup_secondary_cpu() and kvm_setup_pv_ipi() __init, as they
are only invoked from init code and otherwise trigger a section mismatch as
they are now invoking a __init function.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Tested-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>
Tested-by: Sohil Mehta <sohil.mehta@xxxxxxxxx>
Tested-by: Juergen Gross <jgross@xxxxxxxx> # Xen PV (dom0 and unpriv. guest)
---
 arch/x86/hyperv/hv_apic.c | 20 ++++++++++----------
 arch/x86/kernel/kvm.c     |  6 +++---
 arch/x86/kernel/sev.c     |  4 ++--
 3 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/arch/x86/hyperv/hv_apic.c b/arch/x86/hyperv/hv_apic.c
index bfb02f6..72d9931 100644
--- a/arch/x86/hyperv/hv_apic.c
+++ b/arch/x86/hyperv/hv_apic.c
@@ -288,12 +288,12 @@ void __init hv_apic_init(void)
 		 */
 		orig_apic = *apic;
 
-		apic->send_IPI = hv_send_ipi;
-		apic->send_IPI_mask = hv_send_ipi_mask;
-		apic->send_IPI_mask_allbutself = hv_send_ipi_mask_allbutself;
-		apic->send_IPI_allbutself = hv_send_ipi_allbutself;
-		apic->send_IPI_all = hv_send_ipi_all;
-		apic->send_IPI_self = hv_send_ipi_self;
+		apic_update_callback(send_IPI, hv_send_ipi);
+		apic_update_callback(send_IPI_mask, hv_send_ipi_mask);
+		apic_update_callback(send_IPI_mask_allbutself, hv_send_ipi_mask_allbutself);
+		apic_update_callback(send_IPI_allbutself, hv_send_ipi_allbutself);
+		apic_update_callback(send_IPI_all, hv_send_ipi_all);
+		apic_update_callback(send_IPI_self, hv_send_ipi_self);
 	}
 
 	if (ms_hyperv.hints & HV_X64_APIC_ACCESS_RECOMMENDED) {
@@ -312,10 +312,10 @@ void __init hv_apic_init(void)
 		 */
 		apic_update_callback(eoi, hv_apic_eoi_write);
 		if (!x2apic_enabled()) {
-			apic->read      = hv_apic_read;
-			apic->write     = hv_apic_write;
-			apic->icr_write = hv_apic_icr_write;
-			apic->icr_read  = hv_apic_icr_read;
+			apic_update_callback(read, hv_apic_read);
+			apic_update_callback(write, hv_apic_write);
+			apic_update_callback(icr_write, hv_apic_icr_write);
+			apic_update_callback(icr_read, hv_apic_icr_read);
 		}
 	}
 }
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index c86cedb..6a36db4 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -622,10 +622,10 @@ late_initcall(setup_efi_kvm_sev_migration);
 /*
  * Set the IPI entry points
  */
-static void kvm_setup_pv_ipi(void)
+static __init void kvm_setup_pv_ipi(void)
 {
-	apic->send_IPI_mask = kvm_send_ipi_mask;
-	apic->send_IPI_mask_allbutself = kvm_send_ipi_mask_allbutself;
+	apic_update_callback(send_IPI_mask, kvm_send_ipi_mask);
+	apic_update_callback(send_IPI_mask_allbutself, kvm_send_ipi_mask_allbutself);
 	pr_info("setup PV IPIs\n");
 }
 
diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
index 1ee7bed..a2b50ae 100644
--- a/arch/x86/kernel/sev.c
+++ b/arch/x86/kernel/sev.c
@@ -1089,7 +1089,7 @@ static int wakeup_cpu_via_vmgexit(int apic_id, unsigned long start_ip)
 	return ret;
 }
 
-void snp_set_wakeup_secondary_cpu(void)
+void __init snp_set_wakeup_secondary_cpu(void)
 {
 	if (!cc_platform_has(CC_ATTR_GUEST_SEV_SNP))
 		return;
@@ -1099,7 +1099,7 @@ void snp_set_wakeup_secondary_cpu(void)
 	 * required method to start APs under SNP. If the hypervisor does
 	 * not support AP creation, then no APs will be started.
 	 */
-	apic->wakeup_secondary_cpu = wakeup_cpu_via_vmgexit;
+	apic_update_callback(wakeup_secondary_cpu, wakeup_cpu_via_vmgexit);
 }
 
 int __init sev_es_setup_ap_jump_table(struct real_mode_header *rmh)