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Mon, 29 Jan 2024 15:12:08 +0000 (UTC) Date: Mon, 29 Jan 2024 16:12:07 +0100 From: Borislav Petkov To: Michael Roth Cc: x86@kernel.org, kvm@vger.kernel.org, linux-coco@lists.linux.dev, linux-mm@kvack.org, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, jroedel@suse.de, thomas.lendacky@amd.com, hpa@zytor.com, ardb@kernel.org, pbonzini@redhat.com, seanjc@google.com, vkuznets@redhat.com, jmattson@google.com, luto@kernel.org, dave.hansen@linux.intel.com, slp@redhat.com, pgonda@google.com, peterz@infradead.org, srinivas.pandruvada@linux.intel.com, rientjes@google.com, tobin@ibm.com, vbabka@suse.cz, kirill@shutemov.name, ak@linux.intel.com, tony.luck@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com, alpergun@google.com, jarkko@kernel.org, ashish.kalra@amd.com, nikunj.dadhania@amd.com, pankaj.gupta@amd.com, liam.merwick@oracle.com Subject: Re: [PATCH v2 17/25] crypto: ccp: Handle non-volatile INIT_EX data when SNP is enabled Message-ID: <20240129151207.GAZbfAR1_nCqhblsAT@fat_crate.local> References: <20240126041126.1927228-1-michael.roth@amd.com> <20240126041126.1927228-18-michael.roth@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20240126041126.1927228-18-michael.roth@amd.com> X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 3880E100009 X-Stat-Signature: 6py1nabqidanaq1fs4gxxbnbt311o685 X-Rspam-User: X-HE-Tag: 1706541170-297457 X-HE-Meta: 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 MaG3K9FM QRl1pqukz6qxU4D0lUluA22znHYQen6CttEnO6+vTGcWjDbvZQbWLCAJF8VAoj6X2bJgZyPdmS3Nva7APIOzeh7Lneir19prJ2N2LjVLiUXUsemk2n18bpzO6WxEvSAM0aN4+sTHMGzDi7q4358LfBk2yDHPdQYi9C2eAuFT7xXDx+TNK8hoMfyjExNIa4lp29BZr/VxasK7RjiWYEdJomij1mtCgyo9fsAjnUIYYwjv38/Fqe+hNJnLA2A== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Jan 25, 2024 at 10:11:17PM -0600, Michael Roth wrote: > - if (sev_init_ex_buffer) { > + /* > + * If an init_ex_path is provided allocate a buffer for the file and > + * read in the contents. Additionally, if SNP is initialized, convert > + * the buffer pages to firmware pages. > + */ > + if (init_ex_path && !sev_init_ex_buffer) { > + struct page *page; > + > + page = alloc_pages(GFP_KERNEL, get_order(NV_LENGTH)); > + if (!page) { > + dev_err(sev->dev, "SEV: INIT_EX NV memory allocation failed\n"); > + return -ENOMEM; > + } > + > + sev_init_ex_buffer = page_address(page); > + > rc = sev_read_init_ex_file(); > if (rc) > return rc; > + > + /* If SEV-SNP is initialized, transition to firmware page. */ > + if (sev->snp_initialized) { > + unsigned long npages; > + > + npages = 1UL << get_order(NV_LENGTH); > + if (rmp_mark_pages_firmware(__pa(sev_init_ex_buffer), > + npages, false)) { > + dev_err(sev->dev, > + "SEV: INIT_EX NV memory page state change failed.\n"); > + return -ENOMEM; > + } > + } > } Ontop: --- diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index c364ad33f376..5ec563611953 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -775,6 +775,48 @@ static void __sev_platform_init_handle_tmr(struct sev_device *sev) } } +/* + * If an init_ex_path is provided allocate a buffer for the file and + * read in the contents. Additionally, if SNP is initialized, convert + * the buffer pages to firmware pages. + */ +static int __sev_platform_init_handle_init_ex_path(struct sev_device *sev) +{ + struct page *page; + int rc; + + if (!init_ex_path) + return 0; + + if (sev_init_ex_buffer) + return 0; + + page = alloc_pages(GFP_KERNEL, get_order(NV_LENGTH)); + if (!page) { + dev_err(sev->dev, "SEV: INIT_EX NV memory allocation failed\n"); + return -ENOMEM; + } + + sev_init_ex_buffer = page_address(page); + + rc = sev_read_init_ex_file(); + if (rc) + return rc; + + /* If SEV-SNP is initialized, transition to firmware page. */ + if (sev->snp_initialized) { + unsigned long npages; + + npages = 1UL << get_order(NV_LENGTH); + if (rmp_mark_pages_firmware(__pa(sev_init_ex_buffer), npages, false)) { + dev_err(sev->dev, "SEV: INIT_EX NV memory page state change failed.\n"); + return -ENOMEM; + } + } + + return 0; +} + static int __sev_platform_init_locked(int *error) { int rc, psp_ret = SEV_RET_NO_FW_CALL; @@ -790,39 +832,9 @@ static int __sev_platform_init_locked(int *error) __sev_platform_init_handle_tmr(sev); - /* - * If an init_ex_path is provided allocate a buffer for the file and - * read in the contents. Additionally, if SNP is initialized, convert - * the buffer pages to firmware pages. - */ - if (init_ex_path && !sev_init_ex_buffer) { - struct page *page; - - page = alloc_pages(GFP_KERNEL, get_order(NV_LENGTH)); - if (!page) { - dev_err(sev->dev, "SEV: INIT_EX NV memory allocation failed\n"); - return -ENOMEM; - } - - sev_init_ex_buffer = page_address(page); - - rc = sev_read_init_ex_file(); - if (rc) - return rc; - - /* If SEV-SNP is initialized, transition to firmware page. */ - if (sev->snp_initialized) { - unsigned long npages; - - npages = 1UL << get_order(NV_LENGTH); - if (rmp_mark_pages_firmware(__pa(sev_init_ex_buffer), - npages, false)) { - dev_err(sev->dev, - "SEV: INIT_EX NV memory page state change failed.\n"); - return -ENOMEM; - } - } - } + rc = __sev_platform_init_handle_init_ex_path(sev); + if (rc) + return rc; rc = __sev_do_init_locked(&psp_ret); if (rc && psp_ret == SEV_RET_SECURE_DATA_INVALID) { -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette