From b5a5ce58d3d22ce560305ef9c70a2ec21fb887ba Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Tue, 8 Aug 2023 15:04:11 -0700 Subject: [PATCH] x86/apic: Prepare x2APIC for using apic::max_apic_id In order to remove the apic::apic_id_valid() callback and switch to checking apic::max_apic_id, it is required to update apic::max_apic_id when the APIC initialization code overrides it via x2apic_set_max_apicid(). Make the existing booleans a bitfield and add a flag which lets the update function and the core code which switches the driver detect whether the apic instance wants to have that update or not and apply it if required. Signed-off-by: Thomas Gleixner Signed-off-by: Dave Hansen Acked-by: Peter Zijlstra (Intel) Tested-by: Michael Kelley Tested-by: Sohil Mehta Tested-by: Juergen Gross # Xen PV (dom0 and unpriv. guest) --- arch/x86/include/asm/apic.h | 7 ++++--- arch/x86/kernel/apic/local.h | 1 + arch/x86/kernel/apic/probe_64.c | 4 ++++ arch/x86/kernel/apic/x2apic_cluster.c | 1 + arch/x86/kernel/apic/x2apic_phys.c | 5 ++++- 5 files changed, 14 insertions(+), 4 deletions(-) diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h index 42d3240..2e79c13 100644 --- a/arch/x86/include/asm/apic.h +++ b/arch/x86/include/asm/apic.h @@ -266,10 +266,11 @@ struct apic { void (*send_IPI_all)(int vector); void (*send_IPI_self)(int vector); - u32 disable_esr; - enum apic_delivery_modes delivery_mode; - bool dest_mode_logical; + + u32 disable_esr : 1, + dest_mode_logical : 1, + x2apic_set_max_apicid : 1; u32 (*calc_dest_apicid)(unsigned int cpu); diff --git a/arch/x86/kernel/apic/local.h b/arch/x86/kernel/apic/local.h index a250675..e576b3a 100644 --- a/arch/x86/kernel/apic/local.h +++ b/arch/x86/kernel/apic/local.h @@ -23,6 +23,7 @@ int x2apic_phys_pkg_id(int initial_apicid, int index_msb); void x2apic_send_IPI_all(int vector); void x2apic_send_IPI_allbutself(int vector); void x2apic_send_IPI_self(int vector); +extern u32 x2apic_max_apicid; /* IPI */ diff --git a/arch/x86/kernel/apic/probe_64.c b/arch/x86/kernel/apic/probe_64.c index a82bb52..a12a379 100644 --- a/arch/x86/kernel/apic/probe_64.c +++ b/arch/x86/kernel/apic/probe_64.c @@ -19,6 +19,10 @@ static __init void apic_install_driver(struct apic *driver) return; apic = driver; + + if (IS_ENABLED(CONFIG_X86_X2APIC) && apic->x2apic_set_max_apicid) + apic->max_apic_id = x2apic_max_apicid; + pr_info("Switched APIC routing to %s:\n", apic->name); } diff --git a/arch/x86/kernel/apic/x2apic_cluster.c b/arch/x86/kernel/apic/x2apic_cluster.c index 036dd1c..a164764 100644 --- a/arch/x86/kernel/apic/x2apic_cluster.c +++ b/arch/x86/kernel/apic/x2apic_cluster.c @@ -240,6 +240,7 @@ static struct apic apic_x2apic_cluster __ro_after_init = { .phys_pkg_id = x2apic_phys_pkg_id, .max_apic_id = UINT_MAX, + .x2apic_set_max_apicid = true, .get_apic_id = x2apic_get_apic_id, .set_apic_id = x2apic_set_apic_id, diff --git a/arch/x86/kernel/apic/x2apic_phys.c b/arch/x86/kernel/apic/x2apic_phys.c index d292ec3..3aabfd3 100644 --- a/arch/x86/kernel/apic/x2apic_phys.c +++ b/arch/x86/kernel/apic/x2apic_phys.c @@ -8,11 +8,13 @@ int x2apic_phys; static struct apic apic_x2apic_phys; -static u32 x2apic_max_apicid __ro_after_init = UINT_MAX; +u32 x2apic_max_apicid __ro_after_init = UINT_MAX; void __init x2apic_set_max_apicid(u32 apicid) { x2apic_max_apicid = apicid; + if (apic->x2apic_set_max_apicid) + apic->max_apic_id = apicid; } static int __init set_x2apic_phys_mode(char *arg) @@ -161,6 +163,7 @@ static struct apic apic_x2apic_phys __ro_after_init = { .phys_pkg_id = x2apic_phys_pkg_id, .max_apic_id = UINT_MAX, + .x2apic_set_max_apicid = true, .get_apic_id = x2apic_get_apic_id, .set_apic_id = x2apic_set_apic_id, -- 2.7.4