[PATCH v6 35/42] x86/compressed/64: store Confidential Computing blob address in bootparams
From: Brijesh Singh <hidden>
Date: 2021-10-08 18:08:22
Also in:
kvm, linux-efi, linux-mm, lkml, platform-driver-x86
Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
From: Michael Roth <redacted> When the Confidential Computing blob is located by the boot/compressed kernel, store a pointer to it in bootparams->cc_blob_address to avoid the need for the run-time kernel to rescan the EFI config table to find it again. Signed-off-by: Michael Roth <redacted> Signed-off-by: Brijesh Singh <redacted> --- arch/x86/boot/compressed/sev.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/arch/x86/boot/compressed/sev.c b/arch/x86/boot/compressed/sev.c
index 60885d80bf5f..9d6a2ecb609f 100644
--- a/arch/x86/boot/compressed/sev.c
+++ b/arch/x86/boot/compressed/sev.c@@ -375,4 +375,11 @@ void snp_cpuid_init_boot(struct boot_params *bp) /* It should be safe to read SEV MSR and check features now. */ if (!sev_snp_enabled()) sev_es_terminate(1, GHCB_TERM_CPUID); + + /* + * Pass run-time kernel a pointer to CC info via boot_params so EFI + * config table doesn't need to be searched again during early startup + * phase. + */ + bp->cc_blob_address = (u32)(unsigned long)cc_info; }
--
2.25.1