From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
TDX defines SEAMCALL APIs to access TDX control structures corresponding to
the VMX VMCS. Introduce helper accessors to hide its SEAMCALL ABI details.
Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx>
---
TDX MMU part 2 v1:
- Update for the wrapper functions for SEAMCALLs. (Sean)
- Eliminate kvm_mmu_free_private_spt() and open code it.
- Fix bisectability issues in headers (Kai)
- Updates from seamcall overhaul (Kai)
v19:
- deleted unnecessary stub functions,
tdvps_state_non_arch_check() and tdvps_management_check().
---
arch/x86/kvm/vmx/tdx.h | 87 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 87 insertions(+)
diff --git a/arch/x86/kvm/vmx/tdx.h b/arch/x86/kvm/vmx/tdx.h
index 7eeb54fbcae1..66540c57ed61 100644
--- a/arch/x86/kvm/vmx/tdx.h
+++ b/arch/x86/kvm/vmx/tdx.h
@@ -76,6 +76,93 @@ static __always_inline struct vcpu_tdx *to_tdx(struct kvm_vcpu *vcpu)
*/
#include "tdx_ops.h"
+static __always_inline void tdvps_vmcs_check(u32 field, u8 bits)
+{
+#define VMCS_ENC_ACCESS_TYPE_MASK 0x1UL
+#define VMCS_ENC_ACCESS_TYPE_FULL 0x0UL
+#define VMCS_ENC_ACCESS_TYPE_HIGH 0x1UL
+#define VMCS_ENC_ACCESS_TYPE(field) ((field) & VMCS_ENC_ACCESS_TYPE_MASK)
+
+ /* TDX is 64bit only. HIGH field isn't supported. */
+ BUILD_BUG_ON_MSG(__builtin_constant_p(field) &&
+ VMCS_ENC_ACCESS_TYPE(field) == VMCS_ENC_ACCESS_TYPE_HIGH,
+ "Read/Write to TD VMCS *_HIGH fields not supported");
+
+ BUILD_BUG_ON(bits != 16 && bits != 32 && bits != 64);
+
+#define VMCS_ENC_WIDTH_MASK GENMASK(14, 13)
+#define VMCS_ENC_WIDTH_16BIT (0UL << 13)
+#define VMCS_ENC_WIDTH_64BIT (1UL << 13)
+#define VMCS_ENC_WIDTH_32BIT (2UL << 13)
+#define VMCS_ENC_WIDTH_NATURAL (3UL << 13)
+#define VMCS_ENC_WIDTH(field) ((field) & VMCS_ENC_WIDTH_MASK)
+
+ /* TDX is 64bit only. i.e. natural width = 64bit. */
+ BUILD_BUG_ON_MSG(bits != 64 && __builtin_constant_p(field) &&
+ (VMCS_ENC_WIDTH(field) == VMCS_ENC_WIDTH_64BIT ||
+ VMCS_ENC_WIDTH(field) == VMCS_ENC_WIDTH_NATURAL),
+ "Invalid TD VMCS access for 64-bit field");
+ BUILD_BUG_ON_MSG(bits != 32 && __builtin_constant_p(field) &&
+ VMCS_ENC_WIDTH(field) == VMCS_ENC_WIDTH_32BIT,
+ "Invalid TD VMCS access for 32-bit field");
+ BUILD_BUG_ON_MSG(bits != 16 && __builtin_constant_p(field) &&
+ VMCS_ENC_WIDTH(field) == VMCS_ENC_WIDTH_16BIT,
+ "Invalid TD VMCS access for 16-bit field");
+}
+
+#define TDX_BUILD_TDVPS_ACCESSORS(bits, uclass, lclass) \
+static __always_inline u##bits td_##lclass##_read##bits(struct vcpu_tdx *tdx, \
+ u32 field) \
+{ \
+ u64 err, data; \
+ \
+ tdvps_##lclass##_check(field, bits); \
+ err = tdh_vp_rd(tdx, TDVPS_##uclass(field), &data); \
+ if (KVM_BUG_ON(err, tdx->vcpu.kvm)) { \
+ pr_err("TDH_VP_RD["#uclass".0x%x] failed: 0x%llx\n", \
+ field, err); \
+ return 0; \
+ } \
+ return (u##bits)data; \
+} \
+static __always_inline void td_##lclass##_write##bits(struct vcpu_tdx *tdx, \
+ u32 field, u##bits val) \
+{ \
+ u64 err; \
+ \
+ tdvps_##lclass##_check(field, bits); \
+ err = tdh_vp_wr(tdx, TDVPS_##uclass(field), val, \
+ GENMASK_ULL(bits - 1, 0)); \
+ if (KVM_BUG_ON(err, tdx->vcpu.kvm)) \
+ pr_err("TDH_VP_WR["#uclass".0x%x] = 0x%llx failed: 0x%llx\n", \
+ field, (u64)val, err); \
+} \
+static __always_inline void td_##lclass##_setbit##bits(struct vcpu_tdx *tdx, \
+ u32 field, u64 bit) \
+{ \
+ u64 err; \
+ \
+ tdvps_##lclass##_check(field, bits); \
+ err = tdh_vp_wr(tdx, TDVPS_##uclass(field), bit, bit); \
+ if (KVM_BUG_ON(err, tdx->vcpu.kvm)) \
+ pr_err("TDH_VP_WR["#uclass".0x%x] |= 0x%llx failed: 0x%llx\n", \
+ field, bit, err); \
+} \
+static __always_inline void td_##lclass##_clearbit##bits(struct vcpu_tdx *tdx, \
+ u32 field, u64 bit) \
+{ \
+ u64 err; \
+ \
+ tdvps_##lclass##_check(field, bits); \
+ err = tdh_vp_wr(tdx, TDVPS_##uclass(field), 0, bit); \
+ if (KVM_BUG_ON(err, tdx->vcpu.kvm)) \
+ pr_err("TDH_VP_WR["#uclass".0x%x] &= ~0x%llx failed: 0x%llx\n", \
+ field, bit, err); \
+}
+
+TDX_BUILD_TDVPS_ACCESSORS(16, VMCS, vmcs);
+TDX_BUILD_TDVPS_ACCESSORS(32, VMCS, vmcs);
+TDX_BUILD_TDVPS_ACCESSORS(64, VMCS, vmcs);
#else
static inline void tdx_bringup(void) {}
static inline void tdx_cleanup(void) {}
--
2.34.1
