diff options
author | Michael Roth <michael.roth@amd.com> | 2022-03-08 00:33:49 +0300 |
---|---|---|
committer | Borislav Petkov <bp@suse.de> | 2022-04-07 17:47:12 +0300 |
commit | 30612045e69d088f1effd748048ebb0e282984ec (patch) | |
tree | c1850648503433661069afacecf19a747adbad4b /arch/x86/boot | |
parent | b190a043c49af4587f5e157053f909192820522a (diff) |
x86/sev: Use firmware-validated CPUID for SEV-SNP guests
SEV-SNP guests will be provided the location of special 'secrets' and
'CPUID' pages via the Confidential Computing blob. This blob is
provided to the run-time kernel either through a boot_params field that
was initialized by the boot/compressed kernel, or via a setup_data
structure as defined by the Linux Boot Protocol.
Locate the Confidential Computing blob from these sources and, if found,
use the provided CPUID page/table address to create a copy that the
run-time kernel will use when servicing CPUID instructions via a #VC
handler.
Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220307213356.2797205-40-brijesh.singh@amd.com
Diffstat (limited to 'arch/x86/boot')
-rw-r--r-- | arch/x86/boot/compressed/sev.c | 37 |
1 files changed, 0 insertions, 37 deletions
diff --git a/arch/x86/boot/compressed/sev.c b/arch/x86/boot/compressed/sev.c index 82079ce7be06..52f989f6acc2 100644 --- a/arch/x86/boot/compressed/sev.c +++ b/arch/x86/boot/compressed/sev.c @@ -382,43 +382,6 @@ found_cc_info: } /* - * Initialize the kernel's copy of the SNP CPUID table, and set up the - * pointer that will be used to access it. - * - * Maintaining a direct mapping of the SNP CPUID table used by firmware would - * be possible as an alternative, but the approach is brittle since the - * mapping needs to be updated in sync with all the changes to virtual memory - * layout and related mapping facilities throughout the boot process. - */ -static void setup_cpuid_table(const struct cc_blob_sev_info *cc_info) -{ - const struct snp_cpuid_table *cpuid_table_fw, *cpuid_table; - int i; - - if (!cc_info || !cc_info->cpuid_phys || cc_info->cpuid_len < PAGE_SIZE) - sev_es_terminate(SEV_TERM_SET_LINUX, GHCB_TERM_CPUID); - - cpuid_table_fw = (const struct snp_cpuid_table *)cc_info->cpuid_phys; - if (!cpuid_table_fw->count || cpuid_table_fw->count > SNP_CPUID_COUNT_MAX) - sev_es_terminate(SEV_TERM_SET_LINUX, GHCB_TERM_CPUID); - - cpuid_table = snp_cpuid_get_table(); - memcpy((void *)cpuid_table, cpuid_table_fw, sizeof(*cpuid_table)); - - /* Initialize CPUID ranges for range-checking. */ - for (i = 0; i < cpuid_table->count; i++) { - const struct snp_cpuid_fn *fn = &cpuid_table->fn[i]; - - if (fn->eax_in == 0x0) - cpuid_std_range_max = fn->eax; - else if (fn->eax_in == 0x40000000) - cpuid_hyp_range_max = fn->eax; - else if (fn->eax_in == 0x80000000) - cpuid_ext_range_max = fn->eax; - } -} - -/* * Indicate SNP based on presence of SNP-specific CC blob. Subsequent checks * will verify the SNP CPUID/MSR bits. */ |