[PATCH v7 010/102] x86/virt/tdx: Add a helper function to return system wide info about TDX module

isaku.yamahata
2022-06-27T21:55:22Z

From: Isaku Yamahata <isaku.yamahata@intel.com>

TDX KVM needs system-wide information about the TDX module, struct
tdsysinfo_struct. Add a helper function tdx_get_sysinfo() to return it
instead of KVM getting it with various error checks. Move out the struct
definition about it to common place tdx_host.h.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
arch/x86/include/asm/tdx.h | 55 +++++++++++++++++++++++++++++++++++++
arch/x86/virt/vmx/tdx/tdx.c | 20 +++++++++++---
arch/x86/virt/vmx/tdx/tdx.h | 52 -----------------------------------
3 files changed, 71 insertions(+), 56 deletions(-)

diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h
index 801f6e10b2db..dfea0dd71bc1 100644
--- a/arch/x86/include/asm/tdx.h
+++ b/arch/x86/include/asm/tdx.h
@@ -89,11 +89,66 @@ static inline long tdx_kvm_hypercall(unsigned int nr, unsigned long p1,
#endif /* CONFIG_INTEL_TDX_GUEST && CONFIG_KVM_GUEST */

#ifdef CONFIG_INTEL_TDX_HOST
+struct tdx_cpuid_config {
+ u32 leaf;
+ u32 sub_leaf;
+ u32 eax;
+ u32 ebx;
+ u32 ecx;
+ u32 edx;
+} __packed;
+
+#define TDSYSINFO_STRUCT_SIZE 1024
+#define TDSYSINFO_STRUCT_ALIGNMENT 1024
+
+struct tdsysinfo_struct {
+ /* TDX-SEAM Module Info */
+ u32 attributes;
+ u32 vendor_id;
+ u32 build_date;
+ u16 build_num;
+ u16 minor_version;
+ u16 major_version;
+ u8 reserved0[14];
+ /* Memory Info */
+ u16 max_tdmrs;
+ u16 max_reserved_per_tdmr;
+ u16 pamt_entry_size;
+ u8 reserved1[10];
+ /* Control Struct Info */
+ u16 tdcs_base_size;
+ u8 reserved2[2];
+ u16 tdvps_base_size;
+ u8 tdvps_xfam_dependent_size;
+ u8 reserved3[9];
+ /* TD Capabilities */
+ u64 attributes_fixed0;
+ u64 attributes_fixed1;
+ u64 xfam_fixed0;
+ u64 xfam_fixed1;
+ u8 reserved4[32];
+ u32 num_cpuid_config;
+ /*
+ * The actual number of CPUID_CONFIG depends on above
+ * 'num_cpuid_config'. The size of 'struct tdsysinfo_struct'
+ * is 1024B defined by TDX architecture. Use a union with
+ * specific padding to make 'sizeof(struct tdsysinfo_struct)'
+ * equal to 1024.
+ */
+ union {
+ struct tdx_cpuid_config cpuid_configs[0];
+ u8 reserved5[892];
+ };
+} __packed __aligned(TDSYSINFO_STRUCT_ALIGNMENT);
+
bool platform_tdx_enabled(void);
int tdx_init(void);
+const struct tdsysinfo_struct *tdx_get_sysinfo(void);
#else /* !CONFIG_INTEL_TDX_HOST */
static inline bool platform_tdx_enabled(void) { return false; }
static inline int tdx_init(void) { return -ENODEV; }
+struct tdsysinfo_struct;
+static inline const struct tdsysinfo_struct *tdx_get_sysinfo(void) { return NULL; }
#endif /* CONFIG_INTEL_TDX_HOST */

#endif /* !__ASSEMBLY__ */
diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c
index f9a6f8bdade8..14f53494156c 100644
--- a/arch/x86/virt/vmx/tdx/tdx.c
+++ b/arch/x86/virt/vmx/tdx/tdx.c
@@ -364,9 +364,9 @@ static int check_cmrs(struct cmr_info *cmr_array, int *actual_cmr_num)
return 0;
}

-static int tdx_get_sysinfo(struct tdsysinfo_struct *tdsysinfo,
- struct cmr_info *cmr_array,
- int *actual_cmr_num)
+static int __tdx_get_sysinfo(struct tdsysinfo_struct *tdsysinfo,
+ struct cmr_info *cmr_array,
+ int *actual_cmr_num)
{
struct tdx_module_output out;
u64 ret;
@@ -393,6 +393,18 @@ static int tdx_get_sysinfo(struct tdsysinfo_struct *tdsysinfo,
return check_cmrs(cmr_array, actual_cmr_num);
}

+const struct tdsysinfo_struct *tdx_get_sysinfo(void)
+{
+ const struct tdsysinfo_struct *r = NULL;
+
+ mutex_lock(&tdx_module_lock);
+ if (tdx_module_status == TDX_MODULE_INITIALIZED)
+ r = &tdx_sysinfo;
+ mutex_unlock(&tdx_module_lock);
+ return r;
+}
+EXPORT_SYMBOL_GPL(tdx_get_sysinfo);
+
/*
* Skip the memory region below 1MB. Return true if the entire
* region is skipped. Otherwise, the updated range is returned.
@@ -1116,7 +1128,7 @@ static int init_tdx_module(void)
if (ret)
goto out;

- ret = tdx_get_sysinfo(&tdx_sysinfo, tdx_cmr_array, &tdx_cmr_num);
+ ret = __tdx_get_sysinfo(&tdx_sysinfo, tdx_cmr_array, &tdx_cmr_num);
if (ret)
goto out;

diff --git a/arch/x86/virt/vmx/tdx/tdx.h b/arch/x86/virt/vmx/tdx/tdx.h
index e0309558be13..c08e4ee2d0bf 100644
--- a/arch/x86/virt/vmx/tdx/tdx.h
+++ b/arch/x86/virt/vmx/tdx/tdx.h
@@ -65,58 +65,6 @@ struct cmr_info {
#define MAX_CMRS 32
#define CMR_INFO_ARRAY_ALIGNMENT 512

-struct cpuid_config {
- u32 leaf;
- u32 sub_leaf;
- u32 eax;
- u32 ebx;
- u32 ecx;
- u32 edx;
-} __packed;
-
-#define TDSYSINFO_STRUCT_SIZE 1024
-#define TDSYSINFO_STRUCT_ALIGNMENT 1024
-
-struct tdsysinfo_struct {
- /* TDX-SEAM Module Info */
- u32 attributes;
- u32 vendor_id;
- u32 build_date;
- u16 build_num;
- u16 minor_version;
- u16 major_version;
- u8 reserved0[14];
- /* Memory Info */
- u16 max_tdmrs;
- u16 max_reserved_per_tdmr;
- u16 pamt_entry_size;
- u8 reserved1[10];
- /* Control Struct Info */
- u16 tdcs_base_size;
- u8 reserved2[2];
- u16 tdvps_base_size;
- u8 tdvps_xfam_dependent_size;
- u8 reserved3[9];
- /* TD Capabilities */
- u64 attributes_fixed0;
- u64 attributes_fixed1;
- u64 xfam_fixed0;
- u64 xfam_fixed1;
- u8 reserved4[32];
- u32 num_cpuid_config;
- /*
- * The actual number of CPUID_CONFIG depends on above
- * 'num_cpuid_config'. The size of 'struct tdsysinfo_struct'
- * is 1024B defined by TDX architecture. Use a union with
- * specific padding to make 'sizeof(struct tdsysinfo_struct)'
- * equal to 1024.
- */
- union {
- struct cpuid_config cpuid_configs[0];
- u8 reserved5[892];
- };
-} __packed __aligned(TDSYSINFO_STRUCT_ALIGNMENT);
-
struct tdmr_reserved_area {
u64 offset;
u64 size;
--
2.25.1