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Date: Mon, 19 Dec 2022 22:36:29 -0800
From: Xin Li <xin3.li@...el.com>
To: linux-kernel@...r.kernel.org, x86@...nel.org, kvm@...r.kernel.org
Cc: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
dave.hansen@...ux.intel.com, hpa@...or.com, peterz@...radead.org,
andrew.cooper3@...rix.com, seanjc@...gle.com, pbonzini@...hat.com,
ravi.v.shankar@...el.com
Subject: [RFC PATCH 03/32] x86/traps: add install_system_interrupt_handler()
Some kernel components install system interrupt handlers into the IDT,
and we need to do the same for system_interrupt_handlers. A new function
install_system_interrupt_handler() is added to install a system interrupt
handler into both the IDT and system_interrupt_handlers.
Signed-off-by: Xin Li <xin3.li@...el.com>
---
arch/x86/include/asm/traps.h | 2 ++
arch/x86/kernel/cpu/acrn.c | 7 +++++--
arch/x86/kernel/cpu/mshyperv.c | 22 ++++++++++++++--------
arch/x86/kernel/kvm.c | 4 +++-
arch/x86/kernel/traps.c | 8 ++++++++
drivers/xen/events/events_base.c | 5 ++++-
6 files changed, 36 insertions(+), 12 deletions(-)
diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h
index 28c8ba5fd81c..46f5e4e2a346 100644
--- a/arch/x86/include/asm/traps.h
+++ b/arch/x86/include/asm/traps.h
@@ -41,6 +41,8 @@ void math_emulate(struct math_emu_info *);
bool fault_in_kernel_space(unsigned long address);
+void install_system_interrupt_handler(unsigned int n, const void *asm_addr, const void *addr);
+
#ifdef CONFIG_VMAP_STACK
void __noreturn handle_stack_overflow(struct pt_regs *regs,
unsigned long fault_address,
diff --git a/arch/x86/kernel/cpu/acrn.c b/arch/x86/kernel/cpu/acrn.c
index 485441b7f030..9351bf183a9e 100644
--- a/arch/x86/kernel/cpu/acrn.c
+++ b/arch/x86/kernel/cpu/acrn.c
@@ -18,6 +18,7 @@
#include <asm/hypervisor.h>
#include <asm/idtentry.h>
#include <asm/irq_regs.h>
+#include <asm/traps.h>
static u32 __init acrn_detect(void)
{
@@ -26,8 +27,10 @@ static u32 __init acrn_detect(void)
static void __init acrn_init_platform(void)
{
- /* Setup the IDT for ACRN hypervisor callback */
- alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, asm_sysvec_acrn_hv_callback);
+ /* Install system interrupt handler for ACRN hypervisor callback */
+ install_system_interrupt_handler(HYPERVISOR_CALLBACK_VECTOR,
+ asm_sysvec_acrn_hv_callback,
+ sysvec_acrn_hv_callback);
x86_platform.calibrate_tsc = acrn_get_tsc_khz;
x86_platform.calibrate_cpu = acrn_get_tsc_khz;
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index 831613959a92..144b4a622188 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -29,6 +29,7 @@
#include <asm/i8259.h>
#include <asm/apic.h>
#include <asm/timer.h>
+#include <asm/traps.h>
#include <asm/reboot.h>
#include <asm/nmi.h>
#include <clocksource/hyperv_timer.h>
@@ -415,19 +416,24 @@ static void __init ms_hyperv_init_platform(void)
*/
x86_platform.apic_post_init = hyperv_init;
hyperv_setup_mmu_ops();
- /* Setup the IDT for hypervisor callback */
- alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, asm_sysvec_hyperv_callback);
- /* Setup the IDT for reenlightenment notifications */
+ /* Install system interrupt handler for hypervisor callback */
+ install_system_interrupt_handler(HYPERVISOR_CALLBACK_VECTOR,
+ asm_sysvec_hyperv_callback,
+ sysvec_hyperv_callback);
+
+ /* Install system interrupt handler for reenlightenment notifications */
if (ms_hyperv.features & HV_ACCESS_REENLIGHTENMENT) {
- alloc_intr_gate(HYPERV_REENLIGHTENMENT_VECTOR,
- asm_sysvec_hyperv_reenlightenment);
+ install_system_interrupt_handler(HYPERV_REENLIGHTENMENT_VECTOR,
+ asm_sysvec_hyperv_reenlightenment,
+ sysvec_hyperv_reenlightenment);
}
- /* Setup the IDT for stimer0 */
+ /* Install system interrupt handler for stimer0 */
if (ms_hyperv.misc_features & HV_STIMER_DIRECT_MODE_AVAILABLE) {
- alloc_intr_gate(HYPERV_STIMER0_VECTOR,
- asm_sysvec_hyperv_stimer0);
+ install_system_interrupt_handler(HYPERV_STIMER0_VECTOR,
+ asm_sysvec_hyperv_stimer0,
+ sysvec_hyperv_stimer0);
}
# ifdef CONFIG_SMP
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index d4e48b4a438b..b7388ed2a980 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -835,7 +835,9 @@ static void __init kvm_guest_init(void)
if (kvm_para_has_feature(KVM_FEATURE_ASYNC_PF_INT) && kvmapf) {
static_branch_enable(&kvm_async_pf_enabled);
- alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, asm_sysvec_kvm_asyncpf_interrupt);
+ install_system_interrupt_handler(HYPERVISOR_CALLBACK_VECTOR,
+ asm_sysvec_kvm_asyncpf_interrupt,
+ sysvec_kvm_asyncpf_interrupt);
}
#ifdef CONFIG_SMP
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 8f751c06c052..2b8530235e47 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -1491,6 +1491,14 @@ static system_interrupt_handler system_interrupt_handlers[NR_SYSTEM_VECTORS] = {
#undef SYSV
+void __init install_system_interrupt_handler(unsigned int n, const void *asm_addr, const void *addr)
+{
+ BUG_ON(n < FIRST_SYSTEM_VECTOR);
+
+ system_interrupt_handlers[n - FIRST_SYSTEM_VECTOR] = (system_interrupt_handler)addr;
+ alloc_intr_gate(n, asm_addr);
+}
+
void __init trap_init(void)
{
/* Init cpu_entry_area before IST entries are set up */
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index c443f04aaad7..1a9eaf417acc 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -45,6 +45,7 @@
#include <asm/irq.h>
#include <asm/io_apic.h>
#include <asm/i8259.h>
+#include <asm/traps.h>
#include <asm/xen/cpuid.h>
#include <asm/xen/pci.h>
#endif
@@ -2246,7 +2247,9 @@ static __init void xen_alloc_callback_vector(void)
return;
pr_info("Xen HVM callback vector for event delivery is enabled\n");
- alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, asm_sysvec_xen_hvm_callback);
+ install_system_interrupt_handler(HYPERVISOR_CALLBACK_VECTOR,
+ asm_sysvec_xen_hvm_callback,
+ sysvec_xen_hvm_callback);
}
#else
void xen_setup_callback_vector(void) {}
--
2.34.1
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