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Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Andy Lutomirski , Dave Hansen , Sergio Lopez , Peter Gonda , Peter Zijlstra , Srinivas Pandruvada , David Rientjes , Dov Murik , Tobin Feldman-Fitzthum , Borislav Petkov , Michael Roth , Vlastimil Babka , tony.luck@intel.com, npmccallum@redhat.com, brijesh.ksingh@gmail.com, Brijesh Singh Subject: [PATCH Part2 RFC v4 05/40] x86/sev: Add RMP entry lookup helpers Date: Wed, 7 Jul 2021 13:35:41 -0500 Message-Id: <20210707183616.5620-6-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210707183616.5620-1-brijesh.singh@amd.com> References: <20210707183616.5620-1-brijesh.singh@amd.com> Content-Type: text/plain X-ClientProxiedBy: SN6PR04CA0078.namprd04.prod.outlook.com (2603:10b6:805:f2::19) To BYAPR12MB2711.namprd12.prod.outlook.com (2603:10b6:a03:63::10) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from sbrijesh-desktop.amd.com (165.204.77.1) by SN6PR04CA0078.namprd04.prod.outlook.com (2603:10b6:805:f2::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4308.20 via Frontend Transport; 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dkim=pass header.d=amd.com header.s=selector1 header.b=KWXzT1Bx; dmarc=pass (policy=quarantine) header.from=amd.com; spf=pass (imf24.hostedemail.com: domain of brijesh.singh@amd.com designates 40.107.243.72 as permitted sender) smtp.mailfrom=brijesh.singh@amd.com X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 9B832B00009F X-Stat-Signature: f7dawj75gokrtqjgiu8zr61d59t6tnmu X-HE-Tag: 1625683036-700114 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: The snp_lookup_page_in_rmptable() can be used by the host to read the RMP entry for a given page. The RMP entry format is documented in AMD PPR, see https://bugzilla.kernel.org/attachment.cgi?id=296015. Signed-off-by: Brijesh Singh --- arch/x86/include/asm/sev.h | 4 +-- arch/x86/kernel/sev.c | 26 +++++++++++++++++++ include/linux/sev.h | 51 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 78 insertions(+), 3 deletions(-) create mode 100644 include/linux/sev.h diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h index 6c23e694a109..9e7e7e737f55 100644 --- a/arch/x86/include/asm/sev.h +++ b/arch/x86/include/asm/sev.h @@ -9,6 +9,7 @@ #define __ASM_ENCRYPTED_STATE_H #include +#include #include #include #include @@ -75,9 +76,6 @@ extern bool handle_vc_boot_ghcb(struct pt_regs *regs); /* Software defined (when rFlags.CF = 1) */ #define PVALIDATE_FAIL_NOUPDATE 255 -/* RMP page size */ -#define RMP_PG_SIZE_4K 0 - #define RMPADJUST_VMSA_PAGE_BIT BIT(16) #ifdef CONFIG_AMD_MEM_ENCRYPT diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c index f9d813d498fa..1aed3d53f59f 100644 --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -49,6 +49,8 @@ #define DR7_RESET_VALUE 0x400 #define RMPTABLE_ENTRIES_OFFSET 0x4000 +#define RMPENTRY_SHIFT 8 +#define rmptable_page_offset(x) (RMPTABLE_ENTRIES_OFFSET + (((unsigned long)x) >> RMPENTRY_SHIFT)) /* For early boot hypervisor communication in SEV-ES enabled guests */ static struct ghcb boot_ghcb_page __bss_decrypted __aligned(PAGE_SIZE); @@ -2319,3 +2321,27 @@ static int __init snp_rmptable_init(void) * passthough state, and it is available after subsys_initcall(). */ fs_initcall(snp_rmptable_init); + +struct rmpentry *snp_lookup_page_in_rmptable(struct page *page, int *level) +{ + unsigned long phys = page_to_pfn(page) << PAGE_SHIFT; + struct rmpentry *entry, *large_entry; + unsigned long vaddr; + + if (!cpu_feature_enabled(X86_FEATURE_SEV_SNP)) + return NULL; + + vaddr = rmptable_start + rmptable_page_offset(phys); + if (unlikely(vaddr > rmptable_end)) + return NULL; + + entry = (struct rmpentry *)vaddr; + + /* Read a large RMP entry to get the correct page level used in RMP entry. */ + vaddr = rmptable_start + rmptable_page_offset(phys & PMD_MASK); + large_entry = (struct rmpentry *)vaddr; + *level = RMP_TO_X86_PG_LEVEL(rmpentry_pagesize(large_entry)); + + return entry; +} +EXPORT_SYMBOL_GPL(snp_lookup_page_in_rmptable); diff --git a/include/linux/sev.h b/include/linux/sev.h new file mode 100644 index 000000000000..83c89e999999 --- /dev/null +++ b/include/linux/sev.h @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * AMD Secure Encrypted Virtualization + * + * Author: Brijesh Singh + */ + +#ifndef __LINUX_SEV_H +#define __LINUX_SEV_H + +struct __packed rmpentry { + union { + struct { + u64 assigned : 1, + pagesize : 1, + immutable : 1, + rsvd1 : 9, + gpa : 39, + asid : 10, + vmsa : 1, + validated : 1, + rsvd2 : 1; + } info; + u64 low; + }; + u64 high; +}; + +#define rmpentry_assigned(x) ((x)->info.assigned) +#define rmpentry_pagesize(x) ((x)->info.pagesize) +#define rmpentry_vmsa(x) ((x)->info.vmsa) +#define rmpentry_asid(x) ((x)->info.asid) +#define rmpentry_validated(x) ((x)->info.validated) +#define rmpentry_gpa(x) ((unsigned long)(x)->info.gpa) +#define rmpentry_immutable(x) ((x)->info.immutable) + +/* RMP page size */ +#define RMP_PG_SIZE_4K 0 + +#define RMP_TO_X86_PG_LEVEL(level) (((level) == RMP_PG_SIZE_4K) ? PG_LEVEL_4K : PG_LEVEL_2M) + +#ifdef CONFIG_AMD_MEM_ENCRYPT +struct rmpentry *snp_lookup_page_in_rmptable(struct page *page, int *level); +#else +static inline struct rmpentry *snp_lookup_page_in_rmptable(struct page *page, int *level) +{ + return NULL; +} + +#endif /* CONFIG_AMD_MEM_ENCRYPT */ +#endif /* __LINUX_SEV_H */ -- 2.17.1