From patchwork Tue Nov 5 01:05:50 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dionna Amalie Glaze X-Patchwork-Id: 842533 Received: from mail-yw1-f201.google.com (mail-yw1-f201.google.com [209.85.128.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C78982D05D for ; Tue, 5 Nov 2024 01:06:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730768781; cv=none; b=LccghNwQUZpQgJISUVz8mDpGmWOcZImKwKySfAsfEFi+nVWj47B+9X1cU+FCVaKZlcPY8Q3/4RB0bLPwP7NniSbp1EQmad2FDW+0mwA2saPrbg6vnog14XkgZIP5Z9Xch55mOW3d7h3mq2sz14XaRRQXhXGqBUd5kiRxZInDrUc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730768781; c=relaxed/simple; bh=GkUnsi5SarheVW9NGjkSX5hkjknfFVi+MWiKDvinNVA=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=n9H1B8X47XHqUCn31nUO1Hdt5GglVU0dsEDqk/5f7pWf2ILjgX459ITKXO6mHN25mcXAtJRvRh56BlqulB5KSgFlJdZ57l983kEHgh+mhEWBc9VPy176IlMDeY+er/azIfIVIgH7ujx/SvhK+lEbpbL2DcjTvUr/4/sJi3zNrkk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--dionnaglaze.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=d5sOicwM; arc=none smtp.client-ip=209.85.128.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--dionnaglaze.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="d5sOicwM" Received: by mail-yw1-f201.google.com with SMTP id 00721157ae682-6ea82a5480fso48081797b3.0 for ; Mon, 04 Nov 2024 17:06:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1730768778; x=1731373578; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=3V3K/d14Fu8pd45Sc4muOCF75vsjk11/XwXzZj5XgyI=; b=d5sOicwMmIQZPJfbjIukH4QmirLqDcH0ycFeyylaOTMK38kp2qCKE27l9weJRmQxml Gzv5XpoYqliLfXxA+F12NEpLNlE6ETfKEE8wUTtymExKqgeITO/luGTeyQ7AMtnhvlKy IApL2i4wjyPeANwuXmFxi0OtGfBSk2YpzuFrA/qsGnyIEtv7ffJ9n8hCKbEqj4Pu7qPo Z67ztKw1KKfI4o9fRPtCaubDyFBDeAh9j3sZ/imfDXyuHTqg6qxe+iBSQwBt0cV8jUTX /AopLBXIvbdf+zblw8VUvUYPgPj5b7dQu2FpCg8kmL8vo5jSCRFimKnmcdwsPYHJ/RMq V32w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1730768778; x=1731373578; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=3V3K/d14Fu8pd45Sc4muOCF75vsjk11/XwXzZj5XgyI=; b=h0TwnQQ+qZeiqL+zhZFuXouki6stvGtkAHDKZnUpTAYeuMTW/1Bem8nM1IA3uKW0Ey Qj4OZ9tiF8WUpx8uTk4yEH1WFAkMUlYwWGWnQnQ7mnHOKabkkO+Rv6dbni3FaXjugaL0 SkN3IPTswlTZK/bRbDBUtK6fGVFNGyEum+Sf50wt4ywQ0iecAA1ExAkr2/W3TBh9zo6z T3TtDpQc0YjLIKv08zNhMay1bCKyRUYYcCXZr+H3/NSNK4kBZVrqJ+/0ravpZPenRJT7 KD8HrKJSzqolLW0sLdojQSQWZKA0sQcfGlmOroF/MaJtVEGL0RM6jigVe9UK4sg/iKzv a7bw== X-Forwarded-Encrypted: i=1; AJvYcCWNGxZ/NbNIHe5aYhC9V7j5mbjSJGuA4C2kJ1XZckCJUQ1vAMi0PBmb0HYCVaqvoqS45sRCHTnmy3RgYz8=@vger.kernel.org X-Gm-Message-State: AOJu0Yw7nstlQvUEkdaliNw8/bcCziU47Uq9ctn2g/lRQ+6rENEiZXEb Rj8wWKCbt+3WcC6e+AVBX5IQdbcdGdSkORZ+U9RcuxjlLXCSHns3plIw5lt8YKjUfmyhpPSUEh6 WIAVhhl5bXopyYRKubDmU2Q== X-Google-Smtp-Source: AGHT+IHsLGyWDHrXMF2JjSPjIYZ9KRAAjrZkeHUwJIZPYcfCTcUd6Uk6PWcg8l14OxMBiyYtA9ISpQvgEk2QR/J7IQ== X-Received: from dionnaglaze.c.googlers.com ([fda3:e722:ac3:cc00:36:e7b8:ac13:c9e8]) (user=dionnaglaze job=sendgmr) by 2002:a05:690c:4510:b0:6e2:1ab6:699a with SMTP id 00721157ae682-6ea64beda72mr987937b3.7.1730768777924; Mon, 04 Nov 2024 17:06:17 -0800 (PST) Date: Tue, 5 Nov 2024 01:05:50 +0000 In-Reply-To: <20241105010558.1266699-1-dionnaglaze@google.com> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241105010558.1266699-1-dionnaglaze@google.com> X-Mailer: git-send-email 2.47.0.199.ga7371fff76-goog Message-ID: <20241105010558.1266699-4-dionnaglaze@google.com> Subject: [PATCH v4 3/6] crypto: ccp: Track GCTX through sev commands From: Dionna Glaze To: x86@kernel.org, linux-kernel@vger.kernel.org, Tom Lendacky , John Allen , Herbert Xu , "David S. Miller" , Ashish Kalra Cc: Dionna Glaze , linux-crypto@vger.kernel.org In preparation for SEV firmware hotloading support, add bookkeeping structures for GCTX pages that are in use. Compliance with SEV-SNP API section 3.3 Firmware Updates and 4.1.1 Live Update: before a firmware is committed, all active GCTX pages should be updated with SNP_GUEST_STATUS to ensure their data structure remains consistent for the new firmware version. There can only be cpuid_edx(0x8000001f)-1 many SEV-SNP asids in use at one time, so this map associates asid to gctx in order to track which addresses are active gctx pages that need updating. When an asid and gctx page are decommissioned, the page is removed from tracking for update-purposes. Given that GCTX page creation and binding through the SNP_ACTIVATE command are separate, the creation operation also tracks pages that are yet to be bound to an asid. The hotloading support depends on FW_UPLOAD, so the new functions are added in a new file whose object file is conditionally included in the module build. Signed-off-by: Dionna Glaze --- drivers/crypto/ccp/Makefile | 1 + drivers/crypto/ccp/sev-dev.c | 5 ++ drivers/crypto/ccp/sev-dev.h | 15 +++++ drivers/crypto/ccp/sev-fw.c | 117 +++++++++++++++++++++++++++++++++++ 4 files changed, 138 insertions(+) create mode 100644 drivers/crypto/ccp/sev-fw.c diff --git a/drivers/crypto/ccp/Makefile b/drivers/crypto/ccp/Makefile index 394484929dae3..b8b5102cc7973 100644 --- a/drivers/crypto/ccp/Makefile +++ b/drivers/crypto/ccp/Makefile @@ -14,6 +14,7 @@ ccp-$(CONFIG_CRYPTO_DEV_SP_PSP) += psp-dev.o \ platform-access.o \ dbc.o \ hsti.o +ccp-$(CONFIG_FW_UPLOAD) += sev-fw.o obj-$(CONFIG_CRYPTO_DEV_CCP_CRYPTO) += ccp-crypto.o ccp-crypto-objs := ccp-crypto-main.o \ diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index 9810edbb272d2..9265b6d534bbe 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -982,6 +982,9 @@ static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret) print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data, buf_len, false); + if (!ret) + snp_cmd_bookkeeping_locked(cmd, sev, data); + return ret; } @@ -1179,6 +1182,8 @@ static int __sev_snp_init_locked(int *error) sev_es_tmr_size = SNP_TMR_SIZE; + rc = sev_snp_platform_init_firmware_upload(sev); + return rc; } diff --git a/drivers/crypto/ccp/sev-dev.h b/drivers/crypto/ccp/sev-dev.h index 3e4e5574e88a3..28add34484ed1 100644 --- a/drivers/crypto/ccp/sev-dev.h +++ b/drivers/crypto/ccp/sev-dev.h @@ -57,6 +57,13 @@ struct sev_device { bool cmd_buf_backup_active; bool snp_initialized; + +#ifdef CONFIG_FW_UPLOAD + u32 last_snp_asid; + u64 *snp_asid_to_gctx_pages_map; + u64 *snp_unbound_gctx_pages; + u32 snp_unbound_gctx_end; +#endif /* CONFIG_FW_UPLOAD */ }; int sev_dev_init(struct psp_device *psp); @@ -65,4 +72,12 @@ void sev_dev_destroy(struct psp_device *psp); void sev_pci_init(void); void sev_pci_exit(void); +#ifdef CONFIG_FW_UPLOAD +void snp_cmd_bookkeeping_locked(int cmd, struct sev_device *sev, void *data); +int sev_snp_platform_init_firmware_upload(struct sev_device *sev); +#else +static inline void snp_cmd_bookkeeping_locked(int cmd, struct sev_device *sev, void *data) { } +static inline int sev_snp_platform_init_firmware_upload(struct sev_device *sev) { return 0; } +#endif /* CONFIG_FW_UPLOAD */ + #endif /* __SEV_DEV_H */ diff --git a/drivers/crypto/ccp/sev-fw.c b/drivers/crypto/ccp/sev-fw.c new file mode 100644 index 0000000000000..55a5a572da8f1 --- /dev/null +++ b/drivers/crypto/ccp/sev-fw.c @@ -0,0 +1,117 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * AMD Secure Encrypted Virtualization (SEV) firmware upload API + */ + +#include +#include + +#include + +#include "sev-dev.h" + +/* + * After a gctx is created, it is used by snp_launch_start before getting + * bound to an asid. The launch protocol allocates an asid before creating a + * matching gctx page, so there should never be more unbound gctx pages than + * there are possible SNP asids. + * + * The unbound gctx pages must be updated after executing DOWNLOAD_FIRMWARE_EX + * and before committing the firmware. + */ +static void snp_gctx_create_track_locked(struct sev_device *sev, void *data) +{ + struct sev_data_snp_addr *gctx_create = data; + + /* This condition should never happen, but is needed for memory safety. */ + if (sev->snp_unbound_gctx_end >= sev->last_snp_asid) { + dev_warn(sev->dev, "Too many unbound SNP GCTX pages to track\n"); + return; + } + + sev->snp_unbound_gctx_pages[sev->snp_unbound_gctx_end] = gctx_create->address; + sev->snp_unbound_gctx_end++; +} + +/* + * PREREQUISITE: The snp_activate command was successful, meaning the asid + * is in the acceptable range 1..sev->last_snp_asid. + * + * The gctx_paddr must be in the unbound gctx buffer. + */ +static void snp_activate_track_locked(struct sev_device *sev, void *data) +{ + struct sev_data_snp_activate *data_activate = data; + + sev->snp_asid_to_gctx_pages_map[data_activate->asid] = data_activate->gctx_paddr; + + for (int i = 0; i < sev->snp_unbound_gctx_end; i++) { + if (sev->snp_unbound_gctx_pages[i] == data_activate->gctx_paddr) { + /* + * Swap the last unbound gctx page with the now-bound + * gctx page to shrink the buffer. + */ + sev->snp_unbound_gctx_end--; + sev->snp_unbound_gctx_pages[i] = + sev->snp_unbound_gctx_pages[sev->snp_unbound_gctx_end]; + sev->snp_unbound_gctx_pages[sev->snp_unbound_gctx_end] = 0; + break; + } + } +} + +static void snp_decommission_track_locked(struct sev_device *sev, void *data) +{ + struct sev_data_snp_addr *data_decommission = data; + + for (int i = 1; i <= sev->last_snp_asid; i++) { + if (sev->snp_asid_to_gctx_pages_map[i] == data_decommission->address) { + sev->snp_asid_to_gctx_pages_map[i] = 0; + break; + } + } +} + +void snp_cmd_bookkeeping_locked(int cmd, struct sev_device *sev, void *data) +{ + if (!sev->snp_asid_to_gctx_pages_map) + return; + + switch (cmd) { + case SEV_CMD_SNP_GCTX_CREATE: + snp_gctx_create_track_locked(sev, data); + break; + case SEV_CMD_SNP_ACTIVATE: + snp_activate_track_locked(sev, data); + break; + case SEV_CMD_SNP_DECOMMISSION: + snp_decommission_track_locked(sev, data); + break; + default: + break; + } +} + +int sev_snp_platform_init_firmware_upload(struct sev_device *sev) +{ + u32 max_snp_asid; + + /* + * cpuid_edx(0x8000001f) is the minimum SEV ASID, hence the exclusive + * maximum SEV-SNP ASID. Save the inclusive maximum to avoid confusing + * logic elsewhere. + */ + max_snp_asid = cpuid_edx(0x8000001f); + sev->last_snp_asid = max_snp_asid - 1; + if (sev->last_snp_asid) { + sev->snp_asid_to_gctx_pages_map = devm_kmalloc_array( + sev->dev, max_snp_asid * 2, sizeof(u64), GFP_KERNEL | __GFP_ZERO); + sev->snp_unbound_gctx_pages = &sev->snp_asid_to_gctx_pages_map[max_snp_asid]; + if (!sev->snp_asid_to_gctx_pages_map) { + dev_err(sev->dev, + "SEV-SNP: snp_asid_to_gctx_pages_map memory allocation failed\n"); + return -ENOMEM; + } + } + return 0; +} From patchwork Tue Nov 5 01:05:51 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dionna Amalie Glaze X-Patchwork-Id: 840918 Received: from mail-pf1-f201.google.com (mail-pf1-f201.google.com [209.85.210.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A535D3A8CB for ; 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Mon, 04 Nov 2024 17:06:20 -0800 (PST) Date: Tue, 5 Nov 2024 01:05:51 +0000 In-Reply-To: <20241105010558.1266699-1-dionnaglaze@google.com> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241105010558.1266699-1-dionnaglaze@google.com> X-Mailer: git-send-email 2.47.0.199.ga7371fff76-goog Message-ID: <20241105010558.1266699-5-dionnaglaze@google.com> Subject: [PATCH v4 4/6] crypto: ccp: Add DOWNLOAD_FIRMWARE_EX support From: Dionna Glaze To: x86@kernel.org, linux-kernel@vger.kernel.org, Ashish Kalra , Tom Lendacky , John Allen , Herbert Xu , "David S. Miller" Cc: Dionna Glaze , linux-crypto@vger.kernel.org The DOWNLOAD_FIRMWARE_EX command requires cache flushing and introduces new error codes that could be returned to user space. The function is in sev-dev.c rather than sev-fw.c to avoid exposing the __sev_do_cmd_locked function in the sev-dev.h header. Signed-off-by: Dionna Glaze --- drivers/crypto/ccp/sev-dev.c | 66 +++++++++++++++++++++++++++++++----- include/linux/psp-sev.h | 26 ++++++++++++++ include/uapi/linux/psp-sev.h | 5 +++ 3 files changed, 89 insertions(+), 8 deletions(-) diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index 9265b6d534bbe..32f7b6147905e 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -223,6 +223,7 @@ static int sev_cmd_buffer_len(int cmd) case SEV_CMD_SNP_GUEST_REQUEST: return sizeof(struct sev_data_snp_guest_request); case SEV_CMD_SNP_CONFIG: return sizeof(struct sev_user_data_snp_config); case SEV_CMD_SNP_COMMIT: return sizeof(struct sev_data_snp_commit); + case SEV_CMD_SNP_DOWNLOAD_FIRMWARE_EX: return sizeof(struct sev_data_download_firmware_ex); default: return 0; } @@ -1597,14 +1598,7 @@ static int sev_update_firmware(struct device *dev) return -1; } - /* - * SEV FW expects the physical address given to it to be 32 - * byte aligned. Memory allocated has structure placed at the - * beginning followed by the firmware being passed to the SEV - * FW. Allocate enough memory for data structure + alignment - * padding + SEV FW. - */ - data_size = ALIGN(sizeof(struct sev_data_download_firmware), 32); + data_size = ALIGN(sizeof(struct sev_data_download_firmware), SEV_FW_ALIGNMENT); order = get_order(firmware->size + data_size); p = alloc_pages(GFP_KERNEL, order); @@ -1645,6 +1639,62 @@ static int sev_update_firmware(struct device *dev) return ret; } +int sev_snp_download_firmware_ex(struct sev_device *sev, const u8 *data, u32 size, int *error) +{ + struct sev_data_download_firmware_ex *data_ex; + int ret, order; + struct page *p; + u64 data_size; + void *fw_dest; + + data_size = ALIGN(sizeof(struct sev_data_download_firmware_ex), + SEV_FW_ALIGNMENT); + + order = get_order(size + data_size); + p = alloc_pages(GFP_KERNEL, order); + if (!p) + return -ENOMEM; + + /* + * Copy firmware data to a kernel allocated contiguous + * memory region. + */ + data_ex = page_address(p); + fw_dest = page_address(p) + data_size; + memset(data_ex, 0, data_size); + memcpy(fw_dest, data, size); + + data_ex->address = __psp_pa(fw_dest); + data_ex->len = size; + data_ex->cmdlen = sizeof(struct sev_data_download_firmware_ex); + + /* + * SNP_COMMIT should be issued explicitly to commit the updated + * firmware after guest context pages have been updated. + */ + ret = sev_do_cmd(SEV_CMD_SNP_DOWNLOAD_FIRMWARE_EX, data_ex, error); + + if (ret) + goto free_err; + + __free_pages(p, order); + + /* Need to do a DF_FLUSH after live firmware update */ + wbinvd_on_all_cpus(); + ret = __sev_do_cmd_locked(SEV_CMD_SNP_DF_FLUSH, NULL, error); + if (ret) { + dev_dbg(sev->dev, "DF_FLUSH error %d\n", *error); + goto fw_err; + } + + return 0; + +free_err: + __free_pages(p, order); +fw_err: + return ret; +} + static int __sev_snp_shutdown_locked(int *error, bool panic) { struct psp_device *psp = psp_master; diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h index 903ddfea85850..6a08c56cd9771 100644 --- a/include/linux/psp-sev.h +++ b/include/linux/psp-sev.h @@ -16,6 +16,15 @@ #define SEV_FW_BLOB_MAX_SIZE 0x4000 /* 16KB */ +/* + * SEV FW expects the physical address given to it to be 32 + * byte aligned. Memory allocated has structure placed at the + * beginning followed by the firmware being passed to the SEV + * FW. Allocate enough memory for data structure + alignment + * padding + SEV FW. + */ +#define SEV_FW_ALIGNMENT 32 + /** * SEV platform state */ @@ -185,6 +194,23 @@ struct sev_data_download_firmware { u32 len; /* In */ } __packed; +/** + * struct sev_data_download_firmware_ex - DOWNLOAD_FIRMWARE_EX command parameters + * + * @length: length of this command buffer + * @address: physical address of firmware image + * @len: len of the firmware image + * @commit: automatically commit the newly installed image + */ +struct sev_data_download_firmware_ex { + u32 cmdlen; /* In */ + u32 reserved; /* In */ + u64 address; /* In */ + u32 len; /* In */ + u32 commit:1; /* In */ + u32 reserved2:31; /* In */ +} __packed; + /** * struct sev_data_get_id - GET_ID command parameters * diff --git a/include/uapi/linux/psp-sev.h b/include/uapi/linux/psp-sev.h index 832c15d9155bd..936464d4f282a 100644 --- a/include/uapi/linux/psp-sev.h +++ b/include/uapi/linux/psp-sev.h @@ -80,6 +80,11 @@ typedef enum { SEV_RET_INVALID_PAGE_OWNER, SEV_RET_INVALID_PAGE_AEAD_OFLOW, SEV_RET_RMP_INIT_REQUIRED, + SEV_RET_BAD_SVN, + SEV_RET_BAD_VERSION, + SEV_RET_SHUTDOWN_REQUIRED, + SEV_RET_UPDATE_FAILED, + SEV_RET_RESTORE_REQUIRED, SEV_RET_MAX, } sev_ret_code; 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AJvYcCXm2FgpirI2sBHa8bRu2cpN1R3k82LvWdwhD3BM4EwtifltPamFEoDAvLnoPtjR2fe4t/L+Nk6oMblAbWw=@vger.kernel.org X-Gm-Message-State: AOJu0Yxu/5bspSvTZmXoeAGeeVSiHRDlRMAWLFtK59hsnNieEKk+vHjS 6Tqw+rXB+0QlystduepAq0gSC5h0e9kDXA8LR+9nQeWbq6J2yydXq1QjXMeJPrQh76gy8XXdrjH GtJWFhchveuE0r9dRKc7/nw== X-Google-Smtp-Source: AGHT+IFY2IGtbWSAXPxiT/z81FLwvgT0S7GolQL51U68PSsc6CXYDnyycDaDfVb/TTWsrHfpiQKoTO7SLj2Dthj4+A== X-Received: from dionnaglaze.c.googlers.com ([fda3:e722:ac3:cc00:36:e7b8:ac13:c9e8]) (user=dionnaglaze job=sendgmr) by 2002:a05:6a00:62c6:b0:720:b04d:8fcb with SMTP id d2e1a72fcca58-720b9b5c762mr34056b3a.1.1730768782716; Mon, 04 Nov 2024 17:06:22 -0800 (PST) Date: Tue, 5 Nov 2024 01:05:52 +0000 In-Reply-To: <20241105010558.1266699-1-dionnaglaze@google.com> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241105010558.1266699-1-dionnaglaze@google.com> X-Mailer: git-send-email 2.47.0.199.ga7371fff76-goog Message-ID: <20241105010558.1266699-6-dionnaglaze@google.com> Subject: [PATCH v4 5/6] crypto: ccp: Use firmware_upload API for SNP firmware From: Dionna Glaze To: x86@kernel.org, linux-kernel@vger.kernel.org, Tom Lendacky , John Allen , Herbert Xu , "David S. Miller" , Ashish Kalra Cc: Dionna Glaze , linux-crypto@vger.kernel.org On init, the ccp device will make /sys/class/firmware/amd/loading etc firmware upload API attributes available to late-load a SEV-SNP firmware binary. The firmware upload api errors reported are actionable in the following ways: * FW_UPLOAD_ERR_HW_ERROR: the machine is in an unstable state and must be reset. * FW_UPLOAD_ERR_RW_ERROR: the firmware update went bad but can be recovered by hotloading the previous firmware version. Also used in the case that the kernel used the API wrong (bug). * FW_UPLOAD_ERR_FW_INVALID: user error with the data provided, but no instability is expected and no recovery actions are needed. * FW_UPLOAD_ERR_BUSY: upload attempted at a bad time either due to overload or the machine is in the wrong platform state. synthetic_restore_required: Instead of tracking the status of whether an individual GCTX is safe for use in a firmware command, force all following commands to fail with an error that is indicative of needing a firmware rollback. To test: 1. Build the kernel enabling SEV-SNP as normal and add CONFIG_FW_UPLOAD=y. 2. Add the following to your kernel_cmdline: ccp.psp_init_on_probe=0. 3.Get an AMD SEV-SNP firmware sbin appropriate to your Epyc chip model at https://www.amd.com/en/developer/sev.html and extract to get a .sbin file. 4. Run the following with your sbinfile in FW: echo 1 > /sys/class/firmware/snp_dlfw_ex/loading cat "${FW?}" > /sys/class/firmware/snp_dlfw_ex/data echo 0 > /sys/class/firmware/snp_dlfw_ex/loading 5. Verify the firmware update message in dmesg. Co-developed-by: Ashish Kalra Signed-off-by: Ashish Kalra Tested-by: Ashish Kalra Signed-off-by: Dionna Glaze --- drivers/crypto/ccp/Kconfig | 2 + drivers/crypto/ccp/sev-dev.c | 12 +- drivers/crypto/ccp/sev-dev.h | 16 +++ drivers/crypto/ccp/sev-fw.c | 213 +++++++++++++++++++++++++++++++++++ 4 files changed, 241 insertions(+), 2 deletions(-) diff --git a/drivers/crypto/ccp/Kconfig b/drivers/crypto/ccp/Kconfig index f394e45e11ab4..520b1c84d11f4 100644 --- a/drivers/crypto/ccp/Kconfig +++ b/drivers/crypto/ccp/Kconfig @@ -39,6 +39,8 @@ config CRYPTO_DEV_SP_PSP bool "Platform Security Processor (PSP) device" default y depends on CRYPTO_DEV_CCP_DD && X86_64 && AMD_IOMMU + select FW_LOADER + select FW_UPLOAD help Provide support for the AMD Platform Security Processor (PSP). The PSP is a dedicated processor that provides support for key diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index 32f7b6147905e..8c73f023b6420 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -485,7 +485,7 @@ void snp_free_firmware_page(void *addr) } EXPORT_SYMBOL_GPL(snp_free_firmware_page); -static void *sev_fw_alloc(unsigned long len) +void *sev_fw_alloc(unsigned long len) { struct page *page; @@ -853,6 +853,10 @@ static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret) if (WARN_ON_ONCE(!data != !buf_len)) return -EINVAL; + ret = sev_snp_synthetic_error(sev, psp_ret); + if (ret) + return ret; + /* * Copy the incoming data to driver's scratch buffer as __pa() will not * work for some memory, e.g. vmalloc'd addresses, and @data may not be @@ -1523,7 +1527,7 @@ void *psp_copy_user_blob(u64 uaddr, u32 len) } EXPORT_SYMBOL_GPL(psp_copy_user_blob); -static int sev_get_api_version(void) +int sev_get_api_version(void) { struct sev_device *sev = psp_master->sev_data; struct sev_user_data_status status; @@ -2320,6 +2324,8 @@ int sev_dev_init(struct psp_device *psp) if (ret) goto e_irq; + sev_snp_dev_init_firmware_upload(sev); + dev_notice(dev, "sev enabled\n"); return 0; @@ -2398,6 +2404,8 @@ void sev_dev_destroy(struct psp_device *psp) kref_put(&misc_dev->refcount, sev_exit); psp_clear_sev_irq_handler(psp); + + sev_snp_dev_init_firmware_upload(sev); } static int snp_shutdown_on_panic(struct notifier_block *nb, diff --git a/drivers/crypto/ccp/sev-dev.h b/drivers/crypto/ccp/sev-dev.h index 28add34484ed1..52a423e7df84f 100644 --- a/drivers/crypto/ccp/sev-dev.h +++ b/drivers/crypto/ccp/sev-dev.h @@ -59,7 +59,13 @@ struct sev_device { bool snp_initialized; #ifdef CONFIG_FW_UPLOAD + /* Lock to protect fw_cancel */ + struct mutex fw_lock; + struct fw_upload *fwl; + bool fw_cancel; + u32 last_snp_asid; + bool synthetic_restore_required; u64 *snp_asid_to_gctx_pages_map; u64 *snp_unbound_gctx_pages; u32 snp_unbound_gctx_end; @@ -72,12 +78,22 @@ void sev_dev_destroy(struct psp_device *psp); void sev_pci_init(void); void sev_pci_exit(void); +void *sev_fw_alloc(unsigned long len); +int sev_get_api_version(void); +int sev_snp_download_firmware_ex(struct sev_device *sev, const u8 *data, u32 size, int *error); + #ifdef CONFIG_FW_UPLOAD void snp_cmd_bookkeeping_locked(int cmd, struct sev_device *sev, void *data); int sev_snp_platform_init_firmware_upload(struct sev_device *sev); +void sev_snp_dev_init_firmware_upload(struct sev_device *sev); +void sev_snp_destroy_firmware_upload(struct sev_device *sev); +int sev_snp_synthetic_error(struct sev_device *sev, int *psp_ret); #else static inline void snp_cmd_bookkeeping_locked(int cmd, struct sev_device *sev, void *data) { } static inline int sev_snp_platform_init_firmware_upload(struct sev_device *sev) { return 0; } +static inline void sev_snp_dev_init_firmware_upload(struct sev_device *sev) { } +static inline void sev_snp_destroy_firmware_upload(struct sev_device *sev) { } +static inline int sev_snp_synthetic_error(struct sev_device *sev, int *psp_ret) { return 0; } #endif /* CONFIG_FW_UPLOAD */ #endif /* __SEV_DEV_H */ diff --git a/drivers/crypto/ccp/sev-fw.c b/drivers/crypto/ccp/sev-fw.c index 55a5a572da8f1..97ce90f2af29a 100644 --- a/drivers/crypto/ccp/sev-fw.c +++ b/drivers/crypto/ccp/sev-fw.c @@ -4,6 +4,7 @@ */ #include +#include #include #include @@ -115,3 +116,215 @@ int sev_snp_platform_init_firmware_upload(struct sev_device *sev) } return 0; } + +static enum fw_upload_err snp_dlfw_ex_prepare(struct fw_upload *fw_upload, + const u8 *data, u32 size) +{ + return FW_UPLOAD_ERR_NONE; +} + +static enum fw_upload_err snp_dlfw_ex_poll_complete(struct fw_upload *fw_upload) +{ + return FW_UPLOAD_ERR_NONE; +} + +/* + * This may be called asynchronously with an on-going update. All other + * functions are called sequentially in a single thread. To avoid contention on + * register accesses, only update the cancel_request flag. Other functions will + * check this flag and handle the cancel request synchronously. + */ +static void snp_dlfw_ex_cancel(struct fw_upload *fw_upload) +{ + struct sev_device *sev = fw_upload->dd_handle; + + mutex_lock(&sev->fw_lock); + sev->fw_cancel = true; + mutex_unlock(&sev->fw_lock); +} + +static enum fw_upload_err snp_dlfw_ex_err_translate(struct sev_device *sev, int psp_ret) +{ + dev_dbg(sev->dev, "Failed to update SEV firmware: %#x\n", psp_ret); + /* + * Operation error: + * HW_ERROR: Critical error. Machine needs repairs now. + * RW_ERROR: Severe error. Roll back to the prior version to recover. + * User error: + * FW_INVALID: Bad input for this interface. + * BUSY: Wrong machine state to run download_firmware_ex. + */ + switch (psp_ret) { + case SEV_RET_RESTORE_REQUIRED: + dev_warn(sev->dev, "Firmware updated but unusable\n"); + dev_warn(sev->dev, "Need to do manual firmware rollback!!!\n"); + return FW_UPLOAD_ERR_RW_ERROR; + case SEV_RET_SHUTDOWN_REQUIRED: + /* No state changes made. Not a hardware error. */ + dev_warn(sev->dev, "Firmware image cannot be live updated\n"); + return FW_UPLOAD_ERR_FW_INVALID; + case SEV_RET_BAD_VERSION: + /* No state changes made. Not a hardware error. */ + dev_warn(sev->dev, "Firmware image is not well formed\n"); + return FW_UPLOAD_ERR_FW_INVALID; + /* SEV-specific errors that can still happen. */ + case SEV_RET_BAD_SIGNATURE: + /* No state changes made. Not a hardware error. */ + dev_warn(sev->dev, "Firmware image signature is bad\n"); + return FW_UPLOAD_ERR_FW_INVALID; + case SEV_RET_INVALID_PLATFORM_STATE: + /* Calling at the wrong time. Not a hardware error. */ + dev_warn(sev->dev, "Firmware not updated as SEV in INIT state\n"); + return FW_UPLOAD_ERR_BUSY; + case SEV_RET_HWSEV_RET_UNSAFE: + dev_err(sev->dev, "Firmware is unstable. Reset your machine!!!\n"); + return FW_UPLOAD_ERR_HW_ERROR; + /* Kernel bug cases. */ + case SEV_RET_INVALID_PARAM: + dev_err(sev->dev, "Download-firmware-EX invalid parameter\n"); + return FW_UPLOAD_ERR_RW_ERROR; + case SEV_RET_INVALID_ADDRESS: + dev_err(sev->dev, "Download-firmware-EX invalid address\n"); + return FW_UPLOAD_ERR_RW_ERROR; + default: + dev_err(sev->dev, "Unhandled download_firmware_ex err %d\n", psp_ret); + return FW_UPLOAD_ERR_HW_ERROR; + } +} + +static enum fw_upload_err snp_update_guest_statuses(struct sev_device *sev) +{ + struct sev_data_snp_guest_status status_data; + void *snp_guest_status; + enum fw_upload_err ret; + int error; + + /* + * Force an update of guest context pages after SEV firmware + * live update by issuing SNP_GUEST_STATUS on all guest + * context pages. + */ + snp_guest_status = sev_fw_alloc(PAGE_SIZE); + if (!snp_guest_status) + return FW_UPLOAD_ERR_INVALID_SIZE; + + /* + * After the last bound asid-to-gctx page is snp_unbound_gctx_end-many + * unbound gctx pages that also need updating. + */ + for (int i = 1; i <= sev->last_snp_asid + sev->snp_unbound_gctx_end; i++) { + if (sev->snp_asid_to_gctx_pages_map[i]) { + status_data.gctx_paddr = sev->snp_asid_to_gctx_pages_map[i]; + status_data.address = __psp_pa(snp_guest_status); + ret = sev_do_cmd(SEV_CMD_SNP_GUEST_STATUS, &status_data, &error); + if (ret) { + /* + * Handle race with SNP VM being destroyed/decommissoned, + * if guest context page invalid error is returned, + * assume guest has been destroyed. + */ + if (error == SEV_RET_INVALID_GUEST) + continue; + sev->synthetic_restore_required = true; + dev_err(sev->dev, "SNP GCTX update error: %#x\n", error); + dev_err(sev->dev, "Roll back SNP firmware!\n"); + snp_free_firmware_page(snp_guest_status); + ret = FW_UPLOAD_ERR_RW_ERROR; + goto fw_err; + } + } + } +fw_err: + snp_free_firmware_page(snp_guest_status); + return ret; +} + +static enum fw_upload_err snp_dlfw_ex_write(struct fw_upload *fwl, const u8 *data, + u32 offset, u32 size, u32 *written) +{ + struct sev_device *sev = fwl->dd_handle; + u8 api_major, api_minor, build; + int ret, error; + bool cancel; + + if (!sev) + return FW_UPLOAD_ERR_HW_ERROR; + + mutex_lock(&sev->fw_lock); + cancel = sev->fw_cancel; + mutex_unlock(&sev->fw_lock); + + if (cancel) + return FW_UPLOAD_ERR_CANCELED; + + /* + * SEV firmware update is a one-shot update operation, the write() + * callback to be invoked multiple times for the same update is + * unexpected. + */ + if (offset) + return FW_UPLOAD_ERR_INVALID_SIZE; + + if (sev_get_api_version()) + return FW_UPLOAD_ERR_HW_ERROR; + + api_major = sev->api_major; + api_minor = sev->api_minor; + build = sev->build; + + ret = sev_snp_download_firmware_ex(sev, data, size, &error); + if (ret) + return snp_dlfw_ex_err_translate(sev, error); + + ret = snp_update_guest_statuses(sev); + if (ret) + return ret; + + sev_get_api_version(); + if (api_major != sev->api_major || api_minor != sev->api_minor || + build != sev->build) { + dev_info(sev->dev, "SEV firmware updated from %d.%d.%d to %d.%d.%d\n", + api_major, api_minor, build, + sev->api_major, sev->api_minor, sev->build); + } else { + dev_info(sev->dev, "SEV firmware same as old %d.%d.%d\n", + api_major, api_minor, build); + } + + *written = size; + return FW_UPLOAD_ERR_NONE; +} + +static const struct fw_upload_ops snp_dlfw_ex_ops = { + .prepare = snp_dlfw_ex_prepare, + .write = snp_dlfw_ex_write, + .poll_complete = snp_dlfw_ex_poll_complete, + .cancel = snp_dlfw_ex_cancel, +}; + +void sev_snp_dev_init_firmware_upload(struct sev_device *sev) +{ + struct fw_upload *fwl; + + fwl = firmware_upload_register(THIS_MODULE, sev->dev, "snp_dlfw_ex", &snp_dlfw_ex_ops, sev); + + if (IS_ERR(fwl)) + dev_err(sev->dev, "SEV firmware upload initialization error %ld\n", PTR_ERR(fwl)); + + sev->fwl = fwl; + mutex_init(&sev->fw_lock); +} + +void sev_snp_destroy_firmware_upload(struct sev_device *sev) +{ + firmware_upload_unregister(sev->fwl); +} + +int sev_snp_synthetic_error(struct sev_device *sev, int *psp_ret) +{ + if (sev->synthetic_restore_required) { + *psp_ret = SEV_RET_RESTORE_REQUIRED; + return -EIO; + } + return 0; +}