From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
TDX KVM needs system-wide information about the TDX module, store it in
struct tdx_info.
TODO: Once TDX host patch series introduces a framework to read TDX meta
data, convert the code to it.
Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
---
Change v18:
- Newly Added
---
arch/x86/include/uapi/asm/kvm.h | 11 +++++
arch/x86/kvm/vmx/main.c | 9 +++-
arch/x86/kvm/vmx/tdx.c | 79 ++++++++++++++++++++++++++++++++-
arch/x86/kvm/vmx/x86_ops.h | 2 +
4 files changed, 99 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h
index aa7a56a47564..45b2c2304491 100644
--- a/arch/x86/include/uapi/asm/kvm.h
+++ b/arch/x86/include/uapi/asm/kvm.h
@@ -567,4 +567,15 @@ struct kvm_pmu_event_filter {
#define KVM_X86_TDX_VM 2
#define KVM_X86_SNP_VM 3
+#define KVM_TDX_CPUID_NO_SUBLEAF ((__u32)-1)
+
+struct kvm_tdx_cpuid_config {
+ __u32 leaf;
+ __u32 sub_leaf;
+ __u32 eax;
+ __u32 ebx;
+ __u32 ecx;
+ __u32 edx;
+};
+
#endif /* _ASM_X86_KVM_H */
diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c
index 62236bde3779..f181620b2922 100644
--- a/arch/x86/kvm/vmx/main.c
+++ b/arch/x86/kvm/vmx/main.c
@@ -47,6 +47,13 @@ static __init int vt_hardware_setup(void)
return 0;
}
+static void vt_hardware_unsetup(void)
+{
+ if (enable_tdx)
+ tdx_hardware_unsetup();
+ vmx_hardware_unsetup();
+}
+
static int vt_vm_init(struct kvm *kvm)
{
if (is_td(kvm))
@@ -69,7 +76,7 @@ struct kvm_x86_ops vt_x86_ops __initdata = {
.check_processor_compatibility = vmx_check_processor_compat,
- .hardware_unsetup = vmx_hardware_unsetup,
+ .hardware_unsetup = vt_hardware_unsetup,
.hardware_enable = vt_hardware_enable,
.hardware_disable = vmx_hardware_disable,
diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 1608bdf2381d..55399136b680 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -67,7 +67,7 @@ static size_t tdx_md_element_size(u64 fid)
}
}
-int tdx_md_read(struct tdx_md_map *maps, int nr_maps)
+static int tdx_md_read(struct tdx_md_map *maps, int nr_maps)
{
struct tdx_md_map *m;
int ret, i;
@@ -85,9 +85,39 @@ int tdx_md_read(struct tdx_md_map *maps, int nr_maps)
return 0;
}
+struct tdx_info {
+ u64 attributes_fixed0;
+ u64 attributes_fixed1;
+ u64 xfam_fixed0;
+ u64 xfam_fixed1;
+
+ u16 num_cpuid_config;
+ /* This must the last member. */
+ DECLARE_FLEX_ARRAY(struct kvm_tdx_cpuid_config, cpuid_configs);
+};
+
+/* Info about the TDX module. */
+static struct tdx_info *tdx_info;
+
static int __init tdx_module_setup(void)
{
+ u16 num_cpuid_config;
int ret;
+ u32 i;
+
+ struct tdx_md_map mds[] = {
+ TDX_MD_MAP(NUM_CPUID_CONFIG, &num_cpuid_config),
+ };
+
+#define TDX_INFO_MAP(_field_id, _member) \
+ TD_SYSINFO_MAP(_field_id, struct tdx_info, _member)
+
+ struct tdx_metadata_field_mapping tdx_info_md[] = {
+ TDX_INFO_MAP(ATTRS_FIXED0, attributes_fixed0),
+ TDX_INFO_MAP(ATTRS_FIXED1, attributes_fixed1),
+ TDX_INFO_MAP(XFAM_FIXED0, xfam_fixed0),
+ TDX_INFO_MAP(XFAM_FIXED1, xfam_fixed1),
+ };
ret = tdx_enable();
if (ret) {
@@ -95,7 +125,49 @@ static int __init tdx_module_setup(void)
return ret;
}
+ ret = tdx_md_read(mds, ARRAY_SIZE(mds));
+ if (ret)
+ return ret;
+
+ tdx_info = kzalloc(sizeof(*tdx_info) +
+ sizeof(*tdx_info->cpuid_configs) * num_cpuid_config,
+ GFP_KERNEL);
+ if (!tdx_info)
+ return -ENOMEM;
+ tdx_info->num_cpuid_config = num_cpuid_config;
+
+ ret = tdx_sys_metadata_read(tdx_info_md, ARRAY_SIZE(tdx_info_md), tdx_info);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < num_cpuid_config; i++) {
+ struct kvm_tdx_cpuid_config *c = &tdx_info->cpuid_configs[i];
+ u64 leaf, eax_ebx, ecx_edx;
+ struct tdx_md_map cpuids[] = {
+ TDX_MD_MAP(CPUID_CONFIG_LEAVES + i, &leaf),
+ TDX_MD_MAP(CPUID_CONFIG_VALUES + i * 2, &eax_ebx),
+ TDX_MD_MAP(CPUID_CONFIG_VALUES + i * 2 + 1, &ecx_edx),
+ };
+
+ ret = tdx_md_read(cpuids, ARRAY_SIZE(cpuids));
+ if (ret)
+ goto error_sys_rd;
+
+ c->leaf = (u32)leaf;
+ c->sub_leaf = leaf >> 32;
+ c->eax = (u32)eax_ebx;
+ c->ebx = eax_ebx >> 32;
+ c->ecx = (u32)ecx_edx;
+ c->edx = ecx_edx >> 32;
+ }
+
return 0;
+
+error_sys_rd:
+ ret = -EIO;
+ /* kfree() accepts NULL. */
+ kfree(tdx_info);
+ return ret;
}
bool tdx_is_vm_type_supported(unsigned long type)
@@ -163,3 +235,8 @@ int __init tdx_hardware_setup(struct kvm_x86_ops *x86_ops)
out:
return r;
}
+
+void tdx_hardware_unsetup(void)
+{
+ kfree(tdx_info);
+}
diff --git a/arch/x86/kvm/vmx/x86_ops.h b/arch/x86/kvm/vmx/x86_ops.h
index 5da7a5fd91cb..9523087ae355 100644
--- a/arch/x86/kvm/vmx/x86_ops.h
+++ b/arch/x86/kvm/vmx/x86_ops.h
@@ -136,9 +136,11 @@ void vmx_setup_mce(struct kvm_vcpu *vcpu);
#ifdef CONFIG_INTEL_TDX_HOST
int __init tdx_hardware_setup(struct kvm_x86_ops *x86_ops);
+void tdx_hardware_unsetup(void);
bool tdx_is_vm_type_supported(unsigned long type);
#else
static inline int tdx_hardware_setup(struct kvm_x86_ops *x86_ops) { return -EOPNOTSUPP; }
+static inline void tdx_hardware_unsetup(void) {}
static inline bool tdx_is_vm_type_supported(unsigned long type) { return false; }
#endif
--
2.25.1
