KABI: add KABI padding to x86/paravirt ops structures

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4JBL0
CVE: NA

------------------------------

Although CONFIG_PARAVIRT_XXL is not enabled in openeuler_defconfig,
we add KABI padding to the following x86/paravirt ops structures
in advance for potential kabi break:

    pv_irq_ops
    pv_mmu_ops
    pv_lock_ops
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: NYang Yingliang <yangyingliang@huawei.com>
Reviewed-by: NWei Li <liwei391@huawei.com>
Reviewed-by: NCheng Jian <cj.chengjian@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/x86/include/asm/paravirt_types.h

@@ -194,6 +194,9 @@ struct pv_irq_ops {
 
 	void (*safe_halt)(void);
 	void (*halt)(void);
+
+	KABI_RESERVE(1)
+	KABI_RESERVE(2)
 #endif
 } __no_randomize_layout;
 
@@ -280,6 +283,10 @@ struct pv_mmu_ops {
 	   an mfn.  We can tell which is which from the index. */
 	void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
 			   phys_addr_t phys, pgprot_t flags);
+	KABI_RESERVE(1)
+	KABI_RESERVE(2)
+	KABI_RESERVE(3)
+	KABI_RESERVE(4)
 #endif
 } __no_randomize_layout;
 
@@ -298,6 +305,8 @@ struct pv_lock_ops {
 	void (*kick)(int cpu);
 
 	struct paravirt_callee_save vcpu_is_preempted;
+
+	KABI_RESERVE(1)
 } __no_randomize_layout;
 
 /* This contains all the paravirt structures: we get a convenient