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| author |  Brijesh Singh <brijesh.singh@amd.com>
| 2022-02-09 12:10:10 -0600 |
|---|---|---|
| committer |  Borislav Petkov <bp@suse.de>
| 2022-04-06 13:14:24 +0200 |
| commit | 87294bdb7b4b73555b0fba45da1cdecdc6a0d5a8 (patch) | |
| tree | 1a9da8387cd9b30e1ac28ca1992f45659e6d467b /arch/x86/include/asm/sev-common.h | |
| parent | x86/compressed: Add helper for validating pages in the decompression stage (diff) | |
| download | linux-87294bdb7b4b73555b0fba45da1cdecdc6a0d5a8.tar.gz linux-87294bdb7b4b73555b0fba45da1cdecdc6a0d5a8.tar.bz2 linux-87294bdb7b4b73555b0fba45da1cdecdc6a0d5a8.zip | |
x86/compressed: Register GHCB memory when SEV-SNP is active
The SEV-SNP guest is required by the GHCB spec to register the GHCB's
Guest Physical Address (GPA). This is because the hypervisor may prefer
that a guest use a consistent and/or specific GPA for the GHCB associated
with a vCPU. For more information, see the GHCB specification section
"GHCB GPA Registration".
If hypervisor can not work with the guest provided GPA then terminate the
guest boot.
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Venu Busireddy <venu.busireddy@oracle.com>
Link: https://lore.kernel.org/r/20220307213356.2797205-17-brijesh.singh@amd.com
Diffstat (limited to 'arch/x86/include/asm/sev-common.h')
| -rw-r--r-- | arch/x86/include/asm/sev-common.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/include/asm/sev-common.h b/arch/x86/include/asm/sev-common.h index fe7fe16e5fd5..f077a6c95e67 100644 --- a/arch/x86/include/asm/sev-common.h +++ b/arch/x86/include/asm/sev-common.h @@ -57,6 +57,19 @@ #define GHCB_MSR_AP_RESET_HOLD_REQ 0x006 #define GHCB_MSR_AP_RESET_HOLD_RESP 0x007 +/* GHCB GPA Register */ +#define GHCB_MSR_REG_GPA_REQ 0x012 +#define GHCB_MSR_REG_GPA_REQ_VAL(v) \ + /* GHCBData[63:12] */ \ + (((u64)((v) & GENMASK_ULL(51, 0)) << 12) | \ + /* GHCBData[11:0] */ \ + GHCB_MSR_REG_GPA_REQ) + +#define GHCB_MSR_REG_GPA_RESP 0x013 +#define GHCB_MSR_REG_GPA_RESP_VAL(v) \ + /* GHCBData[63:12] */ \ + (((u64)(v) & GENMASK_ULL(63, 12)) >> 12) + /* * SNP Page State Change Operation * |