diff mbox series

[v8,04/33] x86/traps: add install_system_interrupt_handler()

Message ID 20230410081438.1750-5-xin3.li@intel.com
State New
Headers
Series x86: enable FRED for x86-64 |

Commit Message

Li, Xin3 April 10, 2023, 8:14 a.m. UTC 
  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.

Tested-by: Shan Kang <shan.kang@intel.com>
Signed-off-by: Xin Li <xin3.li@intel.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          | 10 ++++++++++
 drivers/xen/events/events_base.c |  5 ++++-
 6 files changed, 38 insertions(+), 12 deletions(-)

Comments

Thomas Gleixner June 5, 2023, 8:57 a.m. UTC | #1 
On Mon, Apr 10 2023 at 01:14, Xin Li wrote:
> Some kernel components install system interrupt handlers into the IDT,
> and we need to do the same for system_interrupt_handlers.

We need to the same? This sentence does not make any sense at all.

  https://www.kernel.org/doc/html/latest/process/maintainer-tip.html

> +void install_system_interrupt_handler(unsigned int n, const void *asm_addr, const void *addr);

Why is this void *?

>  
> +void __init install_system_interrupt_handler(unsigned int n, const void *asm_addr, const void *addr)
> +{
> +	BUG_ON(n < FIRST_SYSTEM_VECTOR);
> +
> +#ifdef CONFIG_X86_64
> +	system_interrupt_handlers[n - FIRST_SYSTEM_VECTOR] = (system_interrupt_handler)addr;

Just that you can add a silly typecast here, right?

Oh well.

> -	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);

Can we please make this less convoluted?

#ifdef CONFIG_X86_64
static inline void sysvec_setup_fred(unsigned int vector, void (*func)(struct pt_regs*))
{
        ...
}
#else
static inline void sysvec_setup_fred(unsigned int vector, void (*func)(struct pt_regs*))
{
}
#endif

#define sysvec_install(vector, func) {                                  \
        sysvec_setup_fred(vector, func);                                \
        alloc_intr_gate(vector, asm_##func);                            \
}

-	alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, asm_sysvec_xen_hvm_callback);
+	sysvec_install(HYPERVISOR_CALLBACK_VECTOR, sysvec_xen_hvm_callback);

No?

Thanks,

        tglx
Li, Xin3 June 6, 2023, 5:46 a.m. UTC | #2 
> #ifdef CONFIG_X86_64
> static inline void sysvec_setup_fred(unsigned int vector, void (*func)(struct
> pt_regs*)) {
>         ...
> }
> #else
> static inline void sysvec_setup_fred(unsigned int vector, void (*func)(struct
> pt_regs*)) { } #endif
> 
> #define sysvec_install(vector, func) {                                  \
>         sysvec_setup_fred(vector, func);                                \
>         alloc_intr_gate(vector, asm_##func);                            \
> }
> 
> -	alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR,
> asm_sysvec_xen_hvm_callback);
> +	sysvec_install(HYPERVISOR_CALLBACK_VECTOR,
> sysvec_xen_hvm_callback);

This is a better way, and I will do so in the next iteration.

Thanks!
Xin
diff mbox series

Patch

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 f1197366a97d..c102c9192cbb 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>
@@ -491,19 +492,24 @@  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 1cceac5984da..5c684df6de7a 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -829,7 +829,9 @@  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 2cbe7e7e8b96..12072e2af4a6 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -1513,6 +1513,16 @@  static system_interrupt_handler system_interrupt_handlers[NR_SYSTEM_VECTORS] = {
 
 #endif /* CONFIG_X86_64 */
 
+void __init install_system_interrupt_handler(unsigned int n, const void *asm_addr, const void *addr)
+{
+	BUG_ON(n < FIRST_SYSTEM_VECTOR);
+
+#ifdef CONFIG_X86_64
+	system_interrupt_handlers[n - FIRST_SYSTEM_VECTOR] = (system_interrupt_handler)addr;
+#endif
+	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 c7715f8bd452..cf1a5ca3bf62 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
@@ -2249,7 +2250,9 @@  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) {}