From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932232AbdESOK2 (ORCPT ); Fri, 19 May 2017 10:10:28 -0400 Received: from mx1.redhat.com ([209.132.183.28]:59782 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932199AbdESOKZ (ORCPT ); Fri, 19 May 2017 10:10:25 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com D39D07302C Authentication-Results: ext-mx10.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx10.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=vkuznets@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com D39D07302C From: Vitaly Kuznetsov To: devel@linuxdriverproject.org Cc: x86@kernel.org, linux-kernel@vger.kernel.org, "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Steven Rostedt , Jork Loeser , Simon Xiao Subject: [PATCH v3 06/10] x86/hyper-v: implement rep hypercalls Date: Fri, 19 May 2017 16:09:49 +0200 Message-Id: <20170519140953.1167-7-vkuznets@redhat.com> In-Reply-To: <20170519140953.1167-1-vkuznets@redhat.com> References: <20170519140953.1167-1-vkuznets@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Fri, 19 May 2017 14:10:19 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Rep hypercalls are normal hypercalls which perform multiple actions at once. Hyper-V guarantees to return exectution to the caller in not more than 50us and the caller needs to use hypercall continuation. Touch NMI watchdog between hypercall invocations. This is going to be used for HvFlushVirtualAddressList hypercall for remote TLB flushing. Signed-off-by: Vitaly Kuznetsov Acked-by: K. Y. Srinivasan Tested-by: Simon Xiao Tested-by: Srikanth Myakam --- arch/x86/include/asm/mshyperv.h | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 028e29b..74fe788 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -4,6 +4,7 @@ #include #include #include +#include #include /* @@ -255,6 +256,31 @@ static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1) #endif } +/* + * Rep hypercalls. Callers of this functions are supposed to ensure that + * rep_count and vahead_size comply with union hv_hypercall_input definition. + */ +static inline u64 hv_do_rep_hypercall(u16 code, u16 rep_count, u16 varhead_size, + void *input, void *output) +{ + union hv_hypercall_input hc_input = { .code = code, + .varhead_size = varhead_size, + .rep_count = rep_count}; + u64 status; + + do { + status = hv_do_hypercall(hc_input.as_uint64, input, output); + if ((status & 0xffff) != HV_STATUS_SUCCESS) + return status; + + hc_input.rep_start = (status >> 32) & 0xfff; + + touch_nmi_watchdog(); + } while (hc_input.rep_start < hc_input.rep_count); + + return status; +} + void hyperv_init(void); void hyperv_report_panic(struct pt_regs *regs); bool hv_is_hypercall_page_setup(void); -- 2.9.3