Merge tag 'loongarch-kvm-6.10' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson into HEAD

LoongArch KVM changes for v6.10

1. Add ParaVirt IPI support.
2. Add software breakpoint support.
3. Add mmio trace events support.

1 files changed, 14 insertions, 8 deletions

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index a42d8a6f7149..803dcfb0e346 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1687,11 +1687,11 @@ static int x2apic_state;
 
 static bool x2apic_hw_locked(void)
 {
-	u64 ia32_cap;
+	u64 x86_arch_cap_msr;
 	u64 msr;
 
-	ia32_cap = x86_read_arch_cap_msr();
-	if (ia32_cap & ARCH_CAP_XAPIC_DISABLE) {
+	x86_arch_cap_msr = x86_read_arch_cap_msr();
+	if (x86_arch_cap_msr & ARCH_CAP_XAPIC_DISABLE) {
 		rdmsrl(MSR_IA32_XAPIC_DISABLE_STATUS, msr);
 		return (msr & LEGACY_XAPIC_DISABLED);
 	}
@@ -1771,7 +1771,7 @@ void x2apic_setup(void)
 	__x2apic_enable();
 }
 
-static __init void apic_set_fixmap(void);
+static __init void apic_set_fixmap(bool read_apic);
 
 static __init void x2apic_disable(void)
 {
@@ -1793,7 +1793,12 @@ static __init void x2apic_disable(void)
 	}
 
 	__x2apic_disable();
-	apic_set_fixmap();
+	/*
+	 * Don't reread the APIC ID as it was already done from
+	 * check_x2apic() and the APIC driver still is a x2APIC variant,
+	 * which fails to do the read after x2APIC was disabled.
+	 */
+	apic_set_fixmap(false);
 }
 
 static __init void x2apic_enable(void)
@@ -2057,13 +2062,14 @@ void __init init_apic_mappings(void)
 	}
 }
 
-static __init void apic_set_fixmap(void)
+static __init void apic_set_fixmap(bool read_apic)
 {
 	set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
 	apic_mmio_base = APIC_BASE;
 	apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n",
 		    apic_mmio_base, mp_lapic_addr);
-	apic_read_boot_cpu_id(false);
+	if (read_apic)
+		apic_read_boot_cpu_id(false);
 }
 
 void __init register_lapic_address(unsigned long address)
@@ -2073,7 +2079,7 @@ void __init register_lapic_address(unsigned long address)
 	mp_lapic_addr = address;
 
 	if (!x2apic_mode)
-		apic_set_fixmap();
+		apic_set_fixmap(true);
 }
 
 /*