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Commit 53e52966 authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Thomas Gleixner
Browse files

x86/hyper-v: Implement hv_do_fast_hypercall16 



Implement 'Fast' hypercall with two 64-bit input parameter. This is
going to be used for HvCallSendSyntheticClusterIpi hypercall.

Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: devel@linuxdriverproject.org
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Tianyu Lan <Tianyu.Lan@microsoft.com>
Cc: "Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>
Link: https://lkml.kernel.org/r/20180622170625.30688-2-vkuznets@redhat.com
parent 0e4c88f3

arch/x86/include/asm/mshyperv.h

+34 −0
Original line number Diff line number Diff line
@@ -193,6 +193,40 @@ static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1) 
		return hv_status;

}



/* Fast hypercall with 16 bytes of input */

static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)

{

	u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;



#ifdef CONFIG_X86_64

	{

		__asm__ __volatile__("mov %4, %%r8\n"

				     CALL_NOSPEC

				     : "=a" (hv_status), ASM_CALL_CONSTRAINT,

				       "+c" (control), "+d" (input1)

				     : "r" (input2),

				       THUNK_TARGET(hv_hypercall_pg)

				     : "cc", "r8", "r9", "r10", "r11");

	}

#else

	{

		u32 input1_hi = upper_32_bits(input1);

		u32 input1_lo = lower_32_bits(input1);

		u32 input2_hi = upper_32_bits(input2);

		u32 input2_lo = lower_32_bits(input2);



		__asm__ __volatile__ (CALL_NOSPEC

				      : "=A"(hv_status),

					"+c"(input1_lo), ASM_CALL_CONSTRAINT

				      :	"A" (control), "b" (input1_hi),

					"D"(input2_hi), "S"(input2_lo),

					THUNK_TARGET(hv_hypercall_pg)

				      : "cc");

	}

#endif

		return hv_status;

}



/*

 * Rep hypercalls. Callers of this functions are supposed to ensure that

 * rep_count and varhead_size comply with Hyper-V hypercall definition.