These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / arch / x86 / kernel / paravirt.c

diff --git a/kernel/arch/x86/kernel/paravirt.c b/kernel/arch/x86/kernel/paravirt.c
index c614dd4..c2130ae 100644 (file)
--- a/kernel/arch/x86/kernel/paravirt.c
+++ b/kernel/arch/x86/kernel/paravirt.c
@@ -41,10 +41,18 @@
 #include <asm/timer.h>
 #include <asm/special_insns.h>
 
-/* nop stub */
-void _paravirt_nop(void)
-{
-}
+/*
+ * nop stub, which must not clobber anything *including the stack* to
+ * avoid confusing the entry prologues.
+ */
+extern void _paravirt_nop(void);
+asm (".pushsection .entry.text, \"ax\"\n"
+     ".global _paravirt_nop\n"
+     "_paravirt_nop:\n\t"
+     "ret\n\t"
+     ".size _paravirt_nop, . - _paravirt_nop\n\t"
+     ".type _paravirt_nop, @function\n\t"
+     ".popsection");
 
 /* identity function, which can be inlined */
 u32 _paravirt_ident_32(u32 x)
@@ -154,7 +162,9 @@ unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
                ret = paravirt_patch_ident_64(insnbuf, len);
 
        else if (type == PARAVIRT_PATCH(pv_cpu_ops.iret) ||
+#ifdef CONFIG_X86_32
                 type == PARAVIRT_PATCH(pv_cpu_ops.irq_enable_sysexit) ||
+#endif
                 type == PARAVIRT_PATCH(pv_cpu_ops.usergs_sysret32) ||
                 type == PARAVIRT_PATCH(pv_cpu_ops.usergs_sysret64))
                /* If operation requires a jmp, then jmp */
@@ -349,9 +359,7 @@ __visible struct pv_cpu_ops pv_cpu_ops = {
        .wbinvd = native_wbinvd,
        .read_msr = native_read_msr_safe,
        .write_msr = native_write_msr_safe,
-       .read_tsc = native_read_tsc,
        .read_pmc = native_read_pmc,
-       .read_tscp = native_read_tscp,
        .load_tr_desc = native_load_tr_desc,
        .set_ldt = native_set_ldt,
        .load_gdt = native_load_gdt,
@@ -371,7 +379,7 @@ __visible struct pv_cpu_ops pv_cpu_ops = {
 
        .load_sp0 = native_load_sp0,
 
-#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
+#if defined(CONFIG_X86_32)
        .irq_enable_sysexit = native_irq_enable_sysexit,
 #endif
 #ifdef CONFIG_X86_64