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| author | Tom Lendacky <thomas.lendacky@amd.com> | 2024-06-05 17:18:45 +0200 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-06-11 07:22:46 +0200 |
| commit | 878e70dbd26e234e6e6941dac3a233af6f632184 (patch) | |
| tree | a72b58480c89933154a92ba6546de8e03778b48f /arch/x86/kernel/sev.c | |
| parent | x86/irqflags: Provide native versions of the local_irq_save()/restore() (diff) | |
| download | linux-878e70dbd26e234e6e6941dac3a233af6f632184.tar.xz linux-878e70dbd26e234e6e6941dac3a233af6f632184.zip | |
x86/sev: Check for the presence of an SVSM in the SNP secrets page
During early boot phases, check for the presence of an SVSM when running
as an SEV-SNP guest.
An SVSM is present if not running at VMPL0 and the 64-bit value at offset
0x148 into the secrets page is non-zero. If an SVSM is present, save the
SVSM Calling Area address (CAA), located at offset 0x150 into the secrets
page, and set the VMPL level of the guest, which should be non-zero, to
indicate the presence of an SVSM.
[ bp: Touchups. ]
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/9d3fe161be93d4ea60f43c2a3f2c311fe708b63b.1717600736.git.thomas.lendacky@amd.com
Diffstat (limited to '')
| -rw-r--r-- | arch/x86/kernel/sev.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c index 3342ed58e168..36a117a38b10 100644 --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -2109,6 +2109,13 @@ bool __head snp_init(struct boot_params *bp) setup_cpuid_table(cc_info); /* + * Record the SVSM Calling Area address (CAA) if the guest is not + * running at VMPL0. The CA will be used to communicate with the + * SVSM to perform the SVSM services. + */ + svsm_setup_ca(cc_info); + + /* * The CC blob will be used later to access the secrets page. Cache * it here like the boot kernel does. */ |