[PATCH v4 2/5] x86/HVM: adjust save/restore hook registration for optional check handler

[Jan Beulich <jbeulich@xxxxxxxx>]

Register NULL uniformly as a first step.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
v2: New.

--- a/xen/arch/x86/cpu/mcheck/vmce.c
+++ b/xen/arch/x86/cpu/mcheck/vmce.c
@@ -374,7 +374,7 @@ static int cf_check vmce_load_vcpu_ctxt(
     return err ?: vmce_restore_vcpu(v, &ctxt);
 }
 
-HVM_REGISTER_SAVE_RESTORE(VMCE_VCPU, vmce_save_vcpu_ctxt,
+HVM_REGISTER_SAVE_RESTORE(VMCE_VCPU, vmce_save_vcpu_ctxt, NULL,
                           vmce_load_vcpu_ctxt, 1, HVMSR_PER_VCPU);
 #endif
 
--- a/xen/arch/x86/emul-i8254.c
+++ b/xen/arch/x86/emul-i8254.c
@@ -458,7 +458,7 @@ static int cf_check pit_load(struct doma
     return rc;
 }
 
-HVM_REGISTER_SAVE_RESTORE(PIT, pit_save, pit_load, 1, HVMSR_PER_DOM);
+HVM_REGISTER_SAVE_RESTORE(PIT, pit_save, NULL, pit_load, 1, HVMSR_PER_DOM);
 #endif
 
 /* The intercept action for PIT DM retval: 0--not handled; 1--handled. */
--- a/xen/arch/x86/hvm/hpet.c
+++ b/xen/arch/x86/hvm/hpet.c
@@ -692,7 +692,7 @@ static int cf_check hpet_load(struct dom
     return 0;
 }
 
-HVM_REGISTER_SAVE_RESTORE(HPET, hpet_save, hpet_load, 1, HVMSR_PER_DOM);
+HVM_REGISTER_SAVE_RESTORE(HPET, hpet_save, NULL, hpet_load, 1, HVMSR_PER_DOM);
 
 static void hpet_set(HPETState *h)
 {
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -793,7 +793,7 @@ static int cf_check hvm_load_tsc_adjust(
     return 0;
 }
 
-HVM_REGISTER_SAVE_RESTORE(TSC_ADJUST, hvm_save_tsc_adjust,
+HVM_REGISTER_SAVE_RESTORE(TSC_ADJUST, hvm_save_tsc_adjust, NULL,
                           hvm_load_tsc_adjust, 1, HVMSR_PER_VCPU);
 
 static int cf_check hvm_save_cpu_ctxt(struct vcpu *v, hvm_domain_context_t *h)
@@ -1189,7 +1189,7 @@ static int cf_check hvm_load_cpu_ctxt(st
     return 0;
 }
 
-HVM_REGISTER_SAVE_RESTORE(CPU, hvm_save_cpu_ctxt, hvm_load_cpu_ctxt, 1,
+HVM_REGISTER_SAVE_RESTORE(CPU, hvm_save_cpu_ctxt, NULL, hvm_load_cpu_ctxt, 1,
                           HVMSR_PER_VCPU);
 
 #define HVM_CPU_XSAVE_SIZE(xcr0) (offsetof(struct hvm_hw_cpu_xsave, \
@@ -1538,6 +1538,7 @@ static int __init cf_check hvm_register_
     hvm_register_savevm(CPU_XSAVE_CODE,
                         "CPU_XSAVE",
                         hvm_save_cpu_xsave_states,
+                        NULL,
                         hvm_load_cpu_xsave_states,
                         HVM_CPU_XSAVE_SIZE(xfeature_mask) +
                             sizeof(struct hvm_save_descriptor),
@@ -1546,6 +1547,7 @@ static int __init cf_check hvm_register_
     hvm_register_savevm(CPU_MSR_CODE,
                         "CPU_MSR",
                         hvm_save_cpu_msrs,
+                        NULL,
                         hvm_load_cpu_msrs,
                         HVM_CPU_MSR_SIZE(ARRAY_SIZE(msrs_to_send)) +
                             sizeof(struct hvm_save_descriptor),
--- a/xen/arch/x86/hvm/irq.c
+++ b/xen/arch/x86/hvm/irq.c
@@ -784,9 +784,9 @@ static int cf_check irq_load_link(struct
     return 0;
 }
 
-HVM_REGISTER_SAVE_RESTORE(PCI_IRQ, irq_save_pci, irq_load_pci,
+HVM_REGISTER_SAVE_RESTORE(PCI_IRQ, irq_save_pci, NULL, irq_load_pci,
                           1, HVMSR_PER_DOM);
-HVM_REGISTER_SAVE_RESTORE(ISA_IRQ, irq_save_isa, irq_load_isa,
+HVM_REGISTER_SAVE_RESTORE(ISA_IRQ, irq_save_isa, NULL, irq_load_isa,
                           1, HVMSR_PER_DOM);
-HVM_REGISTER_SAVE_RESTORE(PCI_LINK, irq_save_link, irq_load_link,
+HVM_REGISTER_SAVE_RESTORE(PCI_LINK, irq_save_link, NULL, irq_load_link,
                           1, HVMSR_PER_DOM);
--- a/xen/arch/x86/hvm/mtrr.c
+++ b/xen/arch/x86/hvm/mtrr.c
@@ -773,7 +773,7 @@ static int cf_check hvm_load_mtrr_msr(st
     return 0;
 }
 
-HVM_REGISTER_SAVE_RESTORE(MTRR, hvm_save_mtrr_msr, hvm_load_mtrr_msr, 1,
+HVM_REGISTER_SAVE_RESTORE(MTRR, hvm_save_mtrr_msr, NULL, hvm_load_mtrr_msr, 1,
                           HVMSR_PER_VCPU);
 
 void memory_type_changed(struct domain *d)
--- a/xen/arch/x86/hvm/pmtimer.c
+++ b/xen/arch/x86/hvm/pmtimer.c
@@ -300,7 +300,7 @@ static int cf_check acpi_load(struct dom
     return 0;
 }
 
-HVM_REGISTER_SAVE_RESTORE(PMTIMER, acpi_save, acpi_load,
+HVM_REGISTER_SAVE_RESTORE(PMTIMER, acpi_save, NULL, acpi_load,
                           1, HVMSR_PER_DOM);
 
 int pmtimer_change_ioport(struct domain *d, uint64_t version)
--- a/xen/arch/x86/hvm/rtc.c
+++ b/xen/arch/x86/hvm/rtc.c
@@ -797,7 +797,7 @@ static int cf_check rtc_load(struct doma
     return 0;
 }
 
-HVM_REGISTER_SAVE_RESTORE(RTC, rtc_save, rtc_load, 1, HVMSR_PER_DOM);
+HVM_REGISTER_SAVE_RESTORE(RTC, rtc_save, NULL, rtc_load, 1, HVMSR_PER_DOM);
 
 void rtc_reset(struct domain *d)
 {
--- a/xen/arch/x86/hvm/save.c
+++ b/xen/arch/x86/hvm/save.c
@@ -88,6 +88,7 @@ static struct {
 void __init hvm_register_savevm(uint16_t typecode,
                                 const char *name,
                                 hvm_save_handler save_state,
+                                hvm_check_handler check_state,
                                 hvm_load_handler load_state,
                                 size_t size, int kind)
 {
@@ -96,6 +97,7 @@ void __init hvm_register_savevm(uint16_t
     ASSERT(hvm_sr_handlers[typecode].check == NULL);
     ASSERT(hvm_sr_handlers[typecode].load == NULL);
     hvm_sr_handlers[typecode].save = save_state;
+    hvm_sr_handlers[typecode].check = check_state;
     hvm_sr_handlers[typecode].load = load_state;
     hvm_sr_handlers[typecode].name = name;
     hvm_sr_handlers[typecode].size = size;
--- a/xen/arch/x86/hvm/vioapic.c
+++ b/xen/arch/x86/hvm/vioapic.c
@@ -631,7 +631,8 @@ static int cf_check ioapic_load(struct d
     return 0;
 }
 
-HVM_REGISTER_SAVE_RESTORE(IOAPIC, ioapic_save, ioapic_load, 1, HVMSR_PER_DOM);
+HVM_REGISTER_SAVE_RESTORE(IOAPIC, ioapic_save, NULL, ioapic_load, 1,
+                          HVMSR_PER_DOM);
 
 void vioapic_reset(struct domain *d)
 {
--- a/xen/arch/x86/hvm/viridian/viridian.c
+++ b/xen/arch/x86/hvm/viridian/viridian.c
@@ -1145,7 +1145,7 @@ static int cf_check viridian_load_domain
     return 0;
 }
 
-HVM_REGISTER_SAVE_RESTORE(VIRIDIAN_DOMAIN, viridian_save_domain_ctxt,
+HVM_REGISTER_SAVE_RESTORE(VIRIDIAN_DOMAIN, viridian_save_domain_ctxt, NULL,
                           viridian_load_domain_ctxt, 1, HVMSR_PER_DOM);
 
 static int cf_check viridian_save_vcpu_ctxt(
@@ -1188,7 +1188,7 @@ static int cf_check viridian_load_vcpu_c
     return 0;
 }
 
-HVM_REGISTER_SAVE_RESTORE(VIRIDIAN_VCPU, viridian_save_vcpu_ctxt,
+HVM_REGISTER_SAVE_RESTORE(VIRIDIAN_VCPU, viridian_save_vcpu_ctxt, NULL,
                           viridian_load_vcpu_ctxt, 1, HVMSR_PER_VCPU);
 
 static int __init cf_check parse_viridian_version(const char *arg)
--- a/xen/arch/x86/hvm/vlapic.c
+++ b/xen/arch/x86/hvm/vlapic.c
@@ -1617,9 +1617,9 @@ static int cf_check lapic_load_regs(stru
     return 0;
 }
 
-HVM_REGISTER_SAVE_RESTORE(LAPIC, lapic_save_hidden,
+HVM_REGISTER_SAVE_RESTORE(LAPIC, lapic_save_hidden, NULL,
                           lapic_load_hidden, 1, HVMSR_PER_VCPU);
-HVM_REGISTER_SAVE_RESTORE(LAPIC_REGS, lapic_save_regs,
+HVM_REGISTER_SAVE_RESTORE(LAPIC_REGS, lapic_save_regs, NULL,
                           lapic_load_regs, 1, HVMSR_PER_VCPU);
 
 int vlapic_init(struct vcpu *v)
--- a/xen/arch/x86/hvm/vpic.c
+++ b/xen/arch/x86/hvm/vpic.c
@@ -449,7 +449,7 @@ static int cf_check vpic_load(struct dom
     return 0;
 }
 
-HVM_REGISTER_SAVE_RESTORE(PIC, vpic_save, vpic_load, 2, HVMSR_PER_DOM);
+HVM_REGISTER_SAVE_RESTORE(PIC, vpic_save, NULL, vpic_load, 2, HVMSR_PER_DOM);
 
 void vpic_reset(struct domain *d)
 {
--- a/xen/arch/x86/include/asm/hvm/save.h
+++ b/xen/arch/x86/include/asm/hvm/save.h
@@ -113,6 +113,7 @@ typedef int (*hvm_load_handler) (struct
 void hvm_register_savevm(uint16_t typecode,
                          const char *name, 
                          hvm_save_handler save_state,
+                         hvm_check_handler check_state,
                          hvm_load_handler load_state,
                          size_t size, int kind);
 
@@ -122,12 +123,13 @@ void hvm_register_savevm(uint16_t typeco
 
 /* Syntactic sugar around that function: specify the max number of
  * saves, and this calculates the size of buffer needed */
-#define HVM_REGISTER_SAVE_RESTORE(_x, _save, _load, _num, _k)             \
+#define HVM_REGISTER_SAVE_RESTORE(_x, _save, check, _load, _num, _k)      \
 static int __init cf_check __hvm_register_##_x##_save_and_restore(void)   \
 {                                                                         \
     hvm_register_savevm(HVM_SAVE_CODE(_x),                                \
                         #_x,                                              \
                         &_save,                                           \
+                        check,                                            \
                         &_load,                                           \
                         (_num) * (HVM_SAVE_LENGTH(_x)                     \
                                   + sizeof (struct hvm_save_descriptor)), \