Commit-ID: 53e52966901a5b14caa2a7c77428a693fe71f734 Gitweb: https://git.kernel.org/tip/53e52966901a5b14caa2a7c77428a693fe71f734 Author: Vitaly Kuznetsov <vkuzn...@redhat.com> AuthorDate: Fri, 22 Jun 2018 19:06:22 +0200 Committer: Thomas Gleixner <t...@linutronix.de> CommitDate: Tue, 3 Jul 2018 09:00:33 +0200
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 <vkuzn...@redhat.com> Signed-off-by: Thomas Gleixner <t...@linutronix.de> Cc: de...@linuxdriverproject.org Cc: "K. Y. Srinivasan" <k...@microsoft.com> Cc: Haiyang Zhang <haiya...@microsoft.com> Cc: Stephen Hemminger <sthem...@microsoft.com> Cc: "H. Peter Anvin" <h...@zytor.com> Cc: Tianyu Lan <tianyu....@microsoft.com> Cc: "Michael Kelley (EOSG)" <michael.h.kel...@microsoft.com> Link: https://lkml.kernel.org/r/20180622170625.30688-2-vkuzn...@redhat.com --- arch/x86/include/asm/mshyperv.h | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 3cd14311edfa..da25642940d3 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -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.
