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[51.6.142.41]) by smtp.gmail.com with ESMTPSA id 133sm4364352wmd.5.2020.01.31.09.49.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 31 Jan 2020 09:49:41 -0800 (PST) X-Inumbo-ID: 0f9cf748-4452-11ea-8396-bc764e2007e4 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=nzNsiiSOGi+mqFAW4l8/O1Lj/8HbpRuY83zzu3RwubU=; b=DDUv6XpXxu3UfM4Yl/k6vw1eYU6CGHODdrlROZgYKx3r8FPahQTL2cXOPO8jPo4wwX giAgbCz+0ld5CPJx+8J3idMBGi+t+m92geA85GQ0Yu9SQEfHd5m+poQZO3ltriIvH8j7 PzhBBj3/sswQYWqBAtEefCDWmoJKSpbCGAOWoPWIrNJEH3yoX8RgAnf7YCTQX7wKeuMB BMzbeGW/aN07B6Q4VWHxk/ZSrIY5pzIUu5s6zgioc+Yw3UaYfYjXBDIzan97vys71q7f oimSq21yWQ4p2lCy/aznIP0QLOjQo9+fZ8UP10nkOz4dC4J9li+bh9RpK8uSZJ6ASUia Pm+w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-transfer-encoding; bh=nzNsiiSOGi+mqFAW4l8/O1Lj/8HbpRuY83zzu3RwubU=; b=G97+Pws0G1xKEzFOOYDlgcmlWIExFsjCRWvyaFqYBl9fx6LtL4ObM4lZ33jpr/F5i0 nOex17pAarFGcbRVVpuCha2qHZr5sINzVblFXkCxWW2LPcf7m6Z8tg48C0zYvWQm2m9S apq/ndBrY+um6TwL/lKZTTdAEceHURyk5rLyCrms7sXEkQUmgNkD7DBhyOwYib1IQDfn 0VwktisLQte51BXZqXMRPE9Yn/zEialI2ANqudquu6TvBOTZGGJtKs/DiCw1fPAhy1TQ +X2NX0LUkY46ec5xSt2mVT5xibpuZeaZHewnDfLqH3HV0Af7yZ1sgWDOpjaJdLwPeDY7 +uow== X-Gm-Message-State: APjAAAXNfvh79KnG3QHE+fW0GU39ZIB3iLnQaegcTfrlnz3TVO9L3tmy +tmTBVIzTMbqLWRhS0CdpOvrxmVrNcM= X-Google-Smtp-Source: APXvYqz+HcLclbwJ4gmCbsEbXDLBrhg9hJwWpQV3K0BKiR2w/tUBAPQuFxCH0XBoRIW4aO/pyjy8fw== X-Received: by 2002:a5d:6a42:: with SMTP id t2mr9199956wrw.83.1580492982298; Fri, 31 Jan 2020 09:49:42 -0800 (PST) From: Wei Liu X-Google-Original-From: Wei Liu To: Xen Development List Date: Fri, 31 Jan 2020 17:49:25 +0000 Message-Id: <20200131174930.31045-7-liuwe@microsoft.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200131174930.31045-1-liuwe@microsoft.com> References: <20200131174930.31045-1-liuwe@microsoft.com> MIME-Version: 1.0 Subject: [Xen-devel] [PATCH v6 06/11] x86/hyperv: provide Hyper-V hypercall functions X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , Wei Liu , Wei Liu , Konrad Rzeszutek Wilk , George Dunlap , Andrew Cooper , Paul Durrant , Ian Jackson , Michael Kelley , Julien Grall , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) These functions will be used later to make hypercalls to Hyper-V. Signed-off-by: Wei Liu Reviewed-by: Paul Durrant --- v6: 1. Use asm(...) to generate symbol 2. Add a comment regarding volatile registers v5: 1. Switch back to direct call 2. Fix some issues pointed out by Jan --- MAINTAINERS | 1 + xen/arch/x86/mm.c | 4 +- xen/arch/x86/xen.lds.S | 4 + xen/include/asm-x86/guest/hyperv-hcall.h | 97 ++++++++++++++++++++++++ 4 files changed, 105 insertions(+), 1 deletion(-) create mode 100644 xen/include/asm-x86/guest/hyperv-hcall.h diff --git a/MAINTAINERS b/MAINTAINERS index 04d91482cd..d0a5ed635b 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -519,6 +519,7 @@ S: Supported F: xen/arch/x86/guest/hyperv/ F: xen/arch/x86/hvm/viridian/ F: xen/include/asm-x86/guest/hyperv.h +F: xen/include/asm-x86/guest/hyperv-hcall.h F: xen/include/asm-x86/guest/hyperv-tlfs.h F: xen/include/asm-x86/hvm/viridian.h =20 diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c index 6b1361845c..e7787c8fde 100644 --- a/xen/arch/x86/mm.c +++ b/xen/arch/x86/mm.c @@ -375,9 +375,11 @@ void __init arch_init_memory(void) } #endif =20 - /* Generate a symbol to be used in linker script */ + /* Generate symbols to be used in linker script */ asm ( ".equ FIXADDR_X_SIZE, %P0; .global FIXADDR_X_SIZE" :: "i" (FIXADDR_X_SIZE) ); + asm ( ".equ HV_HCALL_PAGE, %P0; .global HV_HCALL_PAGE" + :: "i" (__fix_x_to_virt(FIX_X_HYPERV_HCALL)) ); } =20 int page_is_ram_type(unsigned long mfn, unsigned long mem_type) diff --git a/xen/arch/x86/xen.lds.S b/xen/arch/x86/xen.lds.S index de0856b88e..ec8ab2bec6 100644 --- a/xen/arch/x86/xen.lds.S +++ b/xen/arch/x86/xen.lds.S @@ -328,6 +328,10 @@ SECTIONS efi =3D .; #endif =20 +#ifdef CONFIG_HYPERV_GUEST + hv_hcall_page =3D ABSOLUTE(HV_HCALL_PAGE); +#endif + /* Sections to be discarded */ /DISCARD/ : { *(.exit.text) diff --git a/xen/include/asm-x86/guest/hyperv-hcall.h b/xen/include/asm-x86= /guest/hyperv-hcall.h new file mode 100644 index 0000000000..4d3b131b3a --- /dev/null +++ b/xen/include/asm-x86/guest/hyperv-hcall.h @@ -0,0 +1,97 @@ +/*************************************************************************= ***** + * asm-x86/guest/hyperv-hcall.h + * + * This program is free software; you can redistribute it and/or + * modify it under the terms and conditions of the GNU General Public + * License, version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; If not, see . + * + * Copyright (c) 2019 Microsoft. + */ + +#ifndef __X86_HYPERV_HCALL_H__ +#define __X86_HYPERV_HCALL_H__ + +#include +#include + +#include +#include +#include +#include + +static inline uint64_t hv_do_hypercall(uint64_t control, paddr_t input_add= r, + paddr_t output_addr) +{ + uint64_t status; + register unsigned long r8 asm ( "r8" ) =3D output_addr; + + /* See TLFS for volatile registers */ + asm volatile ( "call hv_hcall_page" + : "=3Da" (status), "+c" (control), + "+d" (input_addr) ASM_CALL_CONSTRAINT + : "r" (r8) + : "memory" ); + + return status; +} + +static inline uint64_t hv_do_fast_hypercall(uint16_t code, + uint64_t input1, uint64_t inpu= t2) +{ + uint64_t status; + uint64_t control =3D code | HV_HYPERCALL_FAST_BIT; + register unsigned long r8 asm ( "r8" ) =3D input2; + + /* See TLFS for volatile registers */ + asm volatile ( "call hv_hcall_page" + : "=3Da" (status), "+c" (control), + "+d" (input1) ASM_CALL_CONSTRAINT + : "r" (r8) ); + + return status; +} + +static inline uint64_t hv_do_rep_hypercall(uint16_t code, uint16_t rep_cou= nt, + uint16_t varhead_size, + paddr_t input, paddr_t output) +{ + uint64_t control =3D code; + uint64_t status; + uint16_t rep_comp; + + control |=3D (uint64_t)varhead_size << HV_HYPERCALL_VARHEAD_OFFSET; + control |=3D (uint64_t)rep_count << HV_HYPERCALL_REP_COMP_OFFSET; + + do { + status =3D hv_do_hypercall(control, input, output); + if ( (status & HV_HYPERCALL_RESULT_MASK) !=3D HV_STATUS_SUCCESS ) + break; + + rep_comp =3D MASK_EXTR(status, HV_HYPERCALL_REP_COMP_MASK); + + control &=3D ~HV_HYPERCALL_REP_START_MASK; + control |=3D MASK_INSR(rep_comp, HV_HYPERCALL_REP_START_MASK); + } while ( rep_comp < rep_count ); + + return status; +} + +#endif /* __X86_HYPERV_HCALL_H__ */ + +/* + * Local variables: + * mode: C + * c-file-style: "BSD" + * c-basic-offset: 4 + * tab-width: 4 + * indent-tabs-mode: nil + * End: + */ --=20 2.20.1 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel