Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932801AbdDGL1X (ORCPT ); Fri, 7 Apr 2017 07:27:23 -0400 Received: from mx1.redhat.com ([209.132.183.28]:44655 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755811AbdDGL1Q (ORCPT ); Fri, 7 Apr 2017 07:27:16 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 2C2C12EF182 Authentication-Results: ext-mx05.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx05.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=vkuznets@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 2C2C12EF182 From: Vitaly Kuznetsov To: devel@linuxdriverproject.org, x86@kernel.org Cc: linux-kernel@vger.kernel.org, "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Steven Rostedt , Jork Loeser Subject: [PATCH 2/7] x86/hyper-v: fast hypercall implementation Date: Fri, 7 Apr 2017 13:26:56 +0200 Message-Id: <20170407112701.17157-3-vkuznets@redhat.com> In-Reply-To: <20170407112701.17157-1-vkuznets@redhat.com> References: <20170407112701.17157-1-vkuznets@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Fri, 07 Apr 2017 11:27:11 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2549 Lines: 93 Hyper-V supports 'fast' hypercalls when all parameters are passed through registers. Implement an inline version of a simpliest of these calls: hypercall with one 8-byte input and no output. Proper hypercall input interface (struct hv_hypercall_input) definition is added as well. Signed-off-by: Vitaly Kuznetsov --- arch/x86/include/asm/mshyperv.h | 37 +++++++++++++++++++++++++++++++++++++ arch/x86/include/uapi/asm/hyperv.h | 19 +++++++++++++++++++ 2 files changed, 56 insertions(+) diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 331e834..9a5f58b 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -216,6 +216,43 @@ static inline u64 hv_do_hypercall(u64 control, void *input, void *output) #endif /* !x86_64 */ } +/* Fast hypercall with 8 bytes of input and no output */ +static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1) +{ + union hv_hypercall_input control = {0}; + + control.code = code; + control.fast = 1; +#ifdef CONFIG_X86_64 + { + u64 hv_status; + + __asm__ __volatile__("call *%3" + : "=a" (hv_status) + : "c" (control.as_uint64), "d" (input1), + "m" (hv_hypercall_pg) + : "cc", "r8", "%r9", "%r10", "%r11"); + return hv_status; + } +#else + { + u32 hv_status_hi, hv_status_lo; + + __asm__ __volatile__ ("call *%6" + : "=d"(hv_status_hi), + "=a"(hv_status_lo) : + "d" (control.as_uint32_hi), + "a" (control.as_uint32_lo), + "c" ((u32)input1), + "b" ((u32)(input1 >> 32)), + "m" (hv_hypercall_pg) + : "cc"); + + return hv_status_lo | ((u64)hv_status_hi << 32); + } +#endif +} + void hyperv_init(void); void hyperv_report_panic(struct pt_regs *regs); bool hv_is_hypercall_page_setup(void); diff --git a/arch/x86/include/uapi/asm/hyperv.h b/arch/x86/include/uapi/asm/hyperv.h index 432df4b..c87e900 100644 --- a/arch/x86/include/uapi/asm/hyperv.h +++ b/arch/x86/include/uapi/asm/hyperv.h @@ -256,6 +256,25 @@ #define HV_PROCESSOR_POWER_STATE_C2 2 #define HV_PROCESSOR_POWER_STATE_C3 3 +/* Hypercall interface */ +union hv_hypercall_input { + u64 as_uint64; + struct { + __u32 as_uint32_lo; + __u32 as_uint32_hi; + }; + struct { + __u64 code:16; + __u64 fast:1; + __u64 varhead_size:10; + __u64 reserved1:5; + __u64 rep_count:12; + __u64 reserved2:4; + __u64 rep_start:12; + __u64 reserved3:4; + }; +}; + /* hypercall status code */ #define HV_STATUS_SUCCESS 0 #define HV_STATUS_INVALID_HYPERCALL_CODE 2 -- 2.9.3