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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: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Thomas 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
This commit is contained in:
Vitaly Kuznetsov 2018-06-22 19:06:22 +02:00 committed by Thomas Gleixner
parent 0e4c88f376
commit 53e5296690
1 changed files with 34 additions and 0 deletions
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34
arch/x86/include/asm/mshyperv.h
View File

@ -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.