diff options
| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2024-11-04 12:38:03 +0200 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@linux.intel.com> | 2024-11-07 10:27:45 -0800 |
| commit | 7ae15e2f69bad06527668b478dff7c099ad2e6ae (patch) | |
| tree | 6d55e10d139bce8cda15592b9b36440876a4c8d0 /arch/x86/include | |
| parent | f65aa0ad79fca4ace921da0701644f020129043d (diff) | |
x86/tdx: Enable CPU topology enumeration
TDX 1.0 defines baseline behaviour of TDX guest platform. TDX 1.0
generates a #VE when accessing topology-related CPUID leafs (0xB and
0x1F) and the X2APIC_APICID MSR. The kernel returns all zeros on CPUID
topology. In practice, this means that the kernel can only boot with a
plain topology. Any complications will cause problems.
The ENUM_TOPOLOGY feature allows the VMM to provide topology
information to the guest. Enabling the feature eliminates
topology-related #VEs: the TDX module virtualizes accesses to
the CPUID leafs and the MSR.
Enable ENUM_TOPOLOGY if it is available.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Kai Huang <kai.huang@intel.com>
Link: https://lore.kernel.org/all/20241104103803.195705-5-kirill.shutemov%40linux.intel.com
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/shared/tdx.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/shared/tdx.h b/arch/x86/include/asm/shared/tdx.h index fecb2a6e864b..89f7fcade8ae 100644 --- a/arch/x86/include/asm/shared/tdx.h +++ b/arch/x86/include/asm/shared/tdx.h @@ -23,12 +23,14 @@ #define TDCS_CONFIG_FLAGS 0x1110000300000016 #define TDCS_TD_CTLS 0x1110000300000017 #define TDCS_NOTIFY_ENABLES 0x9100000000000010 +#define TDCS_TOPOLOGY_ENUM_CONFIGURED 0x9100000000000019 /* TDCS_CONFIG_FLAGS bits */ #define TDCS_CONFIG_FLEXIBLE_PENDING_VE BIT_ULL(1) /* TDCS_TD_CTLS bits */ #define TD_CTLS_PENDING_VE_DISABLE BIT_ULL(0) +#define TD_CTLS_ENUM_TOPOLOGY BIT_ULL(1) /* TDX hypercall Leaf IDs */ #define TDVMCALL_MAP_GPA 0x10001 |