x86: provide paravirtualized hook for rdtscp (e5aaac44) · Commits · 戴 / test

arch/x86/kernel/paravirt.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -374,6 +374,7 @@ struct pv_cpu_ops pv_cpu_ops = {
		.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,

+22 −0

Original line number	Diff line number	Diff line
		@@ -120,6 +120,7 @@ struct pv_cpu_ops {

		u64 (*read_tsc)(void);
		u64 (*read_pmc)(int counter);
		unsigned long long (read_tscp)(unsigned int aux);

		/* These two are jmp to, not actually called. */
		void (*irq_enable_syscall_ret)(void);
		@@ -668,6 +669,27 @@ static inline unsigned long long paravirt_read_pmc(int counter)
		high = _l >> 32; \
		} while(0)

		static inline unsigned long long paravirt_rdtscp(unsigned int *aux)
		{
		return PVOP_CALL1(u64, pv_cpu_ops.read_tscp, aux);
		}

		#define rdtscp(low, high, aux) \
		do { \
		int __aux; \
		unsigned long __val = paravirt_rdtscp(&__aux); \
		(low) = (u32)__val; \
		(high) = (u32)(__val >> 32); \
		(aux) = __aux; \
		} while (0)

		#define rdtscpll(val, aux) \
		do { \
		unsigned long __aux; \
		val = paravirt_rdtscp(&__aux); \
		(aux) = __aux; \
		} while (0)

		static inline void load_TR_desc(void)
		{
		PVOP_VCALL0(pv_cpu_ops.load_tr_desc);