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SubjectRe: [PATCH v18 056/121] KVM: TDX: Add accessors VMX VMCS helpers
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On 1/23/2024 7:53 AM, isaku.yamahata@intel.com wrote:
> From: Isaku Yamahata <isaku.yamahata@intel.com>
>
> 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@intel.com>
> ---
> arch/x86/kvm/vmx/tdx.h | 95 ++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 95 insertions(+)
>
> diff --git a/arch/x86/kvm/vmx/tdx.h b/arch/x86/kvm/vmx/tdx.h
> index d3077151252c..c8a52eedde02 100644
> --- a/arch/x86/kvm/vmx/tdx.h
> +++ b/arch/x86/kvm/vmx/tdx.h
> @@ -58,6 +58,101 @@ static inline struct vcpu_tdx *to_tdx(struct kvm_vcpu *vcpu)
> return container_of(vcpu, struct vcpu_tdx, vcpu);
> }
>
> +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");
> +}
> +
> +static __always_inline void tdvps_state_non_arch_check(u64 field, u8 bits) {}
> +static __always_inline void tdvps_management_check(u64 field, u8 bits) {}

Should this two APIs be added along with for he accessors for MANAGEMENT /
STATE_NON_ARCH?

> +
> +#define TDX_BUILD_TDVPS_ACCESSORS(bits, uclass, lclass) \
> +static __always_inline u##bits td_##lclass##_read##bits(struct vcpu_tdx *tdx, \
> + u32 field) \
> +{ \
> + struct tdx_module_args out; \
> + u64 err; \
> + \
> + tdvps_##lclass##_check(field, bits); \
> + err = tdh_vp_rd(tdx->tdvpr_pa, TDVPS_##uclass(field), &out); \
> + 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)out.r8; \
> +} \
> +static __always_inline void td_##lclass##_write##bits(struct vcpu_tdx *tdx, \
> + u32 field, u##bits val) \
> +{ \
> + struct tdx_module_args out; \
> + u64 err; \
> + \
> + tdvps_##lclass##_check(field, bits); \
> + err = tdh_vp_wr(tdx->tdvpr_pa, TDVPS_##uclass(field), val, \
> + GENMASK_ULL(bits - 1, 0), &out); \
> + 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) \
> +{ \
> + struct tdx_module_args out; \
> + u64 err; \
> + \
> + tdvps_##lclass##_check(field, bits); \
> + err = tdh_vp_wr(tdx->tdvpr_pa, TDVPS_##uclass(field), bit, bit, &out); \
> + 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) \
> +{ \
> + struct tdx_module_args out; \
> + u64 err; \
> + \
> + tdvps_##lclass##_check(field, bits); \
> + err = tdh_vp_wr(tdx->tdvpr_pa, TDVPS_##uclass(field), 0, bit, &out); \
> + 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);
> +
> static __always_inline u64 td_tdcs_exec_read64(struct kvm_tdx *kvm_tdx, u32 field)
> {
> struct tdx_module_args out;


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