x86: adds paravirt hook for swapgs

This patch adds paravirt hook for swapgs operation, which is a privileged
operation in x86_64.

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/asm-x86/paravirt.h b/include/asm-x86/paravirt.h
index 7d1c126e2249..e8fbf742d425 100644
--- a/include/asm-x86/paravirt.h
+++ b/include/asm-x86/paravirt.h
@@ -127,6 +127,8 @@ struct pv_cpu_ops {
         void (*irq_enable_syscall_ret)(void);
         void (*iret)(void);
 
+        void (*swapgs)(void);
+
         struct pv_lazy_ops lazy_mode;
 };
 
@@ -1228,6 +1230,13 @@ static inline unsigned long __raw_local_irq_save(void)
         call *pv_cpu_ops+PV_CPU_read_cr0;       \
         pop %edx; pop %ecx
 #else
+#define SWAPGS                                                          \
+        PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
+                  PV_SAVE_REGS;                                         \
+                  call *pv_cpu_ops+PV_CPU_swapgs;                       \
+                  PV_RESTORE_REGS                                       \
+                 )
+
 #define GET_CR2_INTO_RCX                        \
         call *pv_mmu_ops+PV_MMU_read_cr2;       \
         movq %rax, %rcx;                        \