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[81.2.115.148]) by smtp.gmail.com with ESMTPSA id 88sm4077443wrq.77.2020.05.14.07.22.07 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 May 2020 07:22:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=+e0KnBNeEY/okZVW+Hjye5rPrfTMQhkiDKc5yXXoSU4=; b=VBLIXfmAf4K376cKrO9sTpMeuA3X66xHaYy/IKsmoDT+ysGpvXiFCKrXjm1A9CTh+J 8fRoX1y5LVqVPBj3o59tjyIvX8dj9KCg2J6xMnhO03Yyr55wJkTuOxTjgt55pNlXHWB7 vmp6yjTvsjSBBvywrGiKowDpCDX8ZkfsckDJD3EjE1xUs5HGK5y+yHxDvPeyCjc8BbVL gEF/duWHGTp9/avbDu8K4/MeVPRHrCAsgTwBlr0iTpan0/XPNlCLg3JfeRKWA8SSmBvG 7I9F7Ikg2GcRdklTNuk2EPk+AHWRkiRv2Xq/O/ZsE6VS1POzImjXxSFQOcchk7AsBfAC Rshg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=+e0KnBNeEY/okZVW+Hjye5rPrfTMQhkiDKc5yXXoSU4=; b=g07n6LGkZ2D2uGm6wnQ+3FgMYYRKVrW710r+nvMbFlrNYy6BX+OF7jtCaWtcbc/zod 6Gkrbn3T94B16MBTJM+AtBzmBL+BtrsvLc+q/Iq7Gbj79mViHfK6vpb/XB4e4XhDho7Z 7DnDuLjwlhFbrqRY6vUhwbp9+nRxeX05L+nXOwTJTQYSfr6V7D9wk84g7LbWSz4yVZHi 9Yrf0Rk3bICCmgkiqhKTS/xsIUPbo5Rt5TykRwJiQmLJXpHaeDr8GktAcEHQGOwwjoKe DJ+Y2Ku4SU8wEHHRLTBddrhrw70EnUKJUpaR6TbHS+zCuwVoOl7Z7cPet8CwQ55kD/Ml k2Aw== X-Gm-Message-State: AGi0PuYY3S21ScCLuOFhBuxSyXxlZEriLNa+fxiQhdAJs1v4NFZZL2fG xmfTdwd2fM/uAXSYqs8YiMZcT17klcQOWw== X-Google-Smtp-Source: APiQypK43fo9AFBtWLITSRznHkGcXEBOJHi/fw1kepES3DwHA7BRNJdmaMFjiNRSrjN6OQKYEmUm5Q== X-Received: by 2002:a7b:c7d5:: with SMTP id z21mr31974450wmk.112.1589466128405; Thu, 14 May 2020 07:22:08 -0700 (PDT) From: Peter Maydell To: qemu-devel@nongnu.org Subject: [PULL 21/45] docs: APEI GHES generation and CPER record description Date: Thu, 14 May 2020 15:21:14 +0100 Message-Id: <20200514142138.20875-22-peter.maydell@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200514142138.20875-1-peter.maydell@linaro.org> References: <20200514142138.20875-1-peter.maydell@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::343; envelope-from=peter.maydell@linaro.org; helo=mail-wm1-x343.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) Content-Type: text/plain; charset="utf-8" From: Dongjiu Geng Add APEI/GHES detailed design document Signed-off-by: Dongjiu Geng Signed-off-by: Xiang Zheng Reviewed-by: Michael S. Tsirkin Reviewed-by: Igor Mammedov Message-id: 20200512030609.19593-4-gengdongjiu@huawei.com Signed-off-by: Peter Maydell --- docs/specs/acpi_hest_ghes.rst | 110 ++++++++++++++++++++++++++++++++++ docs/specs/index.rst | 1 + 2 files changed, 111 insertions(+) create mode 100644 docs/specs/acpi_hest_ghes.rst diff --git a/docs/specs/acpi_hest_ghes.rst b/docs/specs/acpi_hest_ghes.rst new file mode 100644 index 00000000000..68f1fbe0a4a --- /dev/null +++ b/docs/specs/acpi_hest_ghes.rst @@ -0,0 +1,110 @@ +APEI tables generating and CPER record +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +.. + Copyright (c) 2020 HUAWEI TECHNOLOGIES CO., LTD. + + This work is licensed under the terms of the GNU GPL, version 2 or late= r. + See the COPYING file in the top-level directory. + +Design Details +-------------- + +:: + + etc/acpi/tables etc/hardware_errors + =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D = =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + + +--------------------------+ +----------------------------+ + | | HEST | +--------->| error_block_address1 |= ------+ + | +--------------------------+ | +----------------------------+= | + | | GHES1 | | +------->| error_block_address2 |= ------+-+ + | +--------------------------+ | | +----------------------------+= | | + | | ................. | | | | .............. |= | | + | | error_status_address-----+-+ | -----------------------------+= | | + | | ................. | | +--->| error_block_addressN |= ------+-+---+ + | | read_ack_register--------+-+ | | +----------------------------+= | | | + | | read_ack_preserve | +-+---+--->| read_ack_register1 |= | | | + | | read_ack_write | | | +----------------------------+= | | | + + +--------------------------+ | +-+--->| read_ack_register2 |= | | | + | | GHES2 | | | | +----------------------------+= | | | + + +--------------------------+ | | | | ............. |= | | | + | | ................. | | | | +----------------------------+= | | | + | | error_status_address-----+---+ | | +->| read_ack_registerN |= | | | + | | ................. | | | | +----------------------------+= | | | + | | read_ack_register--------+-----+ | | |Generic Error Status Block 1|= <-----+ | | + | | read_ack_preserve | | | |-+------------------------+-+= | | + | | read_ack_write | | | | | CPER | |= | | + + +--------------------------| | | | | CPER | |= | | + | | ............... | | | | | .... | |= | | + + +--------------------------+ | | | | CPER | |= | | + | | GHESN | | | |-+------------------------+-|= | | + + +--------------------------+ | | |Generic Error Status Block 2|= <-------+ | + | | ................. | | | |-+------------------------+-+= | + | | error_status_address-----+-------+ | | | CPER | |= | + | | ................. | | | | CPER | |= | + | | read_ack_register--------+---------+ | | .... | |= | + | | read_ack_preserve | | | CPER | |= | + | | read_ack_write | +-+------------------------+-+= | + + +--------------------------+ | .......... |= | + |----------------------------+= | + |Generic Error Status Block N = |<----------+ + |-+-------------------------+-+ + | | CPER | | + | | CPER | | + | | .... | | + | | CPER | | + +-+-------------------------+-+ + + +(1) QEMU generates the ACPI HEST table. This table goes in the current + "etc/acpi/tables" fw_cfg blob. Each error source has different + notification types. + +(2) A new fw_cfg blob called "etc/hardware_errors" is introduced. QEMU + also needs to populate this blob. The "etc/hardware_errors" fw_cfg blob + contains an address registers table and an Error Status Data Block tab= le. + +(3) The address registers table contains N Error Block Address entries + and N Read Ack Register entries. The size for each entry is 8-byte. + The Error Status Data Block table contains N Error Status Data Block + entries. The size for each entry is 4096(0x1000) bytes. The total size + for the "etc/hardware_errors" fw_cfg blob is (N * 8 * 2 + N * 4096) by= tes. + N is the number of the kinds of hardware error sources. + +(4) QEMU generates the ACPI linker/loader script for the firmware. The + firmware pre-allocates memory for "etc/acpi/tables", "etc/hardware_err= ors" + and copies blob contents there. + +(5) QEMU generates N ADD_POINTER commands, which patch addresses in the + "error_status_address" fields of the HEST table with a pointer to the + corresponding "address registers" in the "etc/hardware_errors" blob. + +(6) QEMU generates N ADD_POINTER commands, which patch addresses in the + "read_ack_register" fields of the HEST table with a pointer to the + corresponding "read_ack_register" within the "etc/hardware_errors" blo= b. + +(7) QEMU generates N ADD_POINTER commands for the firmware, which patch + addresses in the "error_block_address" fields with a pointer to the + respective "Error Status Data Block" in the "etc/hardware_errors" blob. + +(8) QEMU defines a third and write-only fw_cfg blob which is called + "etc/hardware_errors_addr". Through that blob, the firmware can send b= ack + the guest-side allocation addresses to QEMU. The "etc/hardware_errors_= addr" + blob contains a 8-byte entry. QEMU generates a single WRITE_POINTER co= mmand + for the firmware. The firmware will write back the start address of + "etc/hardware_errors" blob to the fw_cfg file "etc/hardware_errors_add= r". + +(9) When QEMU gets a SIGBUS from the kernel, QEMU writes CPER into corresp= onding + "Error Status Data Block", guest memory, and then injects platform spe= cific + interrupt (in case of arm/virt machine it's Synchronous External Abort= ) as a + notification which is necessary for notifying the guest. + +(10) This notification (in virtual hardware) will be handled by the guest + kernel, on receiving notification, guest APEI driver could read the C= PER error + and take appropriate action. + +(11) kvm_arch_on_sigbus_vcpu() uses source_id as index in "etc/hardware_er= rors" to + find out "Error Status Data Block" entry corresponding to error sourc= e. So supported + source_id values should be assigned here and not be changed afterward= s to make sure + that guest will write error into expected "Error Status Data Block" e= ven if guest was + migrated to a newer QEMU. diff --git a/docs/specs/index.rst b/docs/specs/index.rst index de46a8b5e7d..426632a4755 100644 --- a/docs/specs/index.rst +++ b/docs/specs/index.rst @@ -14,3 +14,4 @@ Contents: ppc-spapr-xive acpi_hw_reduced_hotplug tpm + acpi_hest_ghes --=20 2.20.1