Merge tag 'x86_vmware_for_v6.11_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 vmware updates from Borislav Petkov:

 - Add a unified VMware hypercall API layer which should be used by all
   callers instead of them doing homegrown solutions. This will provide
   for adding API support for confidential computing solutions like TDX

* tag 'x86_vmware_for_v6.11_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/vmware: Add TDX hypercall support
  x86/vmware: Remove legacy VMWARE_HYPERCALL* macros
  x86/vmware: Correct macro names
  x86/vmware: Use VMware hypercall API
  drm/vmwgfx: Use VMware hypercall API
  input/vmmouse: Use VMware hypercall API
  ptp/vmware: Use VMware hypercall API
  x86/vmware: Introduce VMware hypercall API

1 files changed, 303 insertions, 33 deletions

diff --git a/arch/x86/include/asm/vmware.h b/arch/x86/include/asm/vmware.h
index ac9fc51e2b18..c9cf43d5ef23 100644
--- a/arch/x86/include/asm/vmware.h
+++ b/arch/x86/include/asm/vmware.h
@@ -7,51 +7,321 @@
 #include <linux/stringify.h>
 
 /*
- * The hypercall definitions differ in the low word of the %edx argument
- * in the following way: the old port base interface uses the port
- * number to distinguish between high- and low bandwidth versions.
+ * VMware hypercall ABI.
+ *
+ * - Low bandwidth (LB) hypercalls (I/O port based, vmcall and vmmcall)
+ * have up to 6 input and 6 output arguments passed and returned using
+ * registers: %eax (arg0), %ebx (arg1), %ecx (arg2), %edx (arg3),
+ * %esi (arg4), %edi (arg5).
+ * The following input arguments must be initialized by the caller:
+ * arg0 - VMWARE_HYPERVISOR_MAGIC
+ * arg2 - Hypercall command
+ * arg3 bits [15:0] - Port number, LB and direction flags
+ *
+ * - Low bandwidth TDX hypercalls (x86_64 only) are similar to LB
+ * hypercalls. They also have up to 6 input and 6 output on registers
+ * arguments, with different argument to register mapping:
+ * %r12 (arg0), %rbx (arg1), %r13 (arg2), %rdx (arg3),
+ * %rsi (arg4), %rdi (arg5).
+ *
+ * - High bandwidth (HB) hypercalls are I/O port based only. They have
+ * up to 7 input and 7 output arguments passed and returned using
+ * registers: %eax (arg0), %ebx (arg1), %ecx (arg2), %edx (arg3),
+ * %esi (arg4), %edi (arg5), %ebp (arg6).
+ * The following input arguments must be initialized by the caller:
+ * arg0 - VMWARE_HYPERVISOR_MAGIC
+ * arg1 - Hypercall command
+ * arg3 bits [15:0] - Port number, HB and direction flags
+ *
+ * For compatibility purposes, x86_64 systems use only lower 32 bits
+ * for input and output arguments.
+ *
+ * The hypercall definitions differ in the low word of the %edx (arg3)
+ * in the following way: the old I/O port based interface uses the port
+ * number to distinguish between high- and low bandwidth versions, and
+ * uses IN/OUT instructions to define transfer direction.
  *
  * The new vmcall interface instead uses a set of flags to select
  * bandwidth mode and transfer direction. The flags should be loaded
- * into %dx by any user and are automatically replaced by the port
- * number if the VMWARE_HYPERVISOR_PORT method is used.
- *
- * In short, new driver code should strictly use the new definition of
- * %dx content.
+ * into arg3 by any user and are automatically replaced by the port
+ * number if the I/O port method is used.
  */
 
-/* Old port-based version */
-#define VMWARE_HYPERVISOR_PORT    0x5658
-#define VMWARE_HYPERVISOR_PORT_HB 0x5659
+#define VMWARE_HYPERVISOR_HB		BIT(0)
+#define VMWARE_HYPERVISOR_OUT		BIT(1)
 
-/* Current vmcall / vmmcall version */
-#define VMWARE_HYPERVISOR_HB   BIT(0)
-#define VMWARE_HYPERVISOR_OUT  BIT(1)
+#define VMWARE_HYPERVISOR_PORT		0x5658
+#define VMWARE_HYPERVISOR_PORT_HB	(VMWARE_HYPERVISOR_PORT | \
+					 VMWARE_HYPERVISOR_HB)
 
-/* The low bandwidth call. The low word of edx is presumed clear. */
-#define VMWARE_HYPERCALL						\
-	ALTERNATIVE_2("movw $" __stringify(VMWARE_HYPERVISOR_PORT) ", %%dx; " \
-		      "inl (%%dx), %%eax",				\
-		      "vmcall", X86_FEATURE_VMCALL,			\
-		      "vmmcall", X86_FEATURE_VMW_VMMCALL)
+#define VMWARE_HYPERVISOR_MAGIC		0x564d5868U
 
+#define VMWARE_CMD_GETVERSION		10
+#define VMWARE_CMD_GETHZ		45
+#define VMWARE_CMD_GETVCPU_INFO		68
+#define VMWARE_CMD_STEALCLOCK		91
 /*
- * The high bandwidth out call. The low word of edx is presumed to have the
- * HB and OUT bits set.
+ * Hypercall command mask:
+ *   bits [6:0] command, range [0, 127]
+ *   bits [19:16] sub-command, range [0, 15]
  */
-#define VMWARE_HYPERCALL_HB_OUT						\
-	ALTERNATIVE_2("movw $" __stringify(VMWARE_HYPERVISOR_PORT_HB) ", %%dx; " \
-		      "rep outsb",					\
-		      "vmcall", X86_FEATURE_VMCALL,			\
-		      "vmmcall", X86_FEATURE_VMW_VMMCALL)
+#define VMWARE_CMD_MASK			0xf007fU
+
+#define CPUID_VMWARE_FEATURES_ECX_VMMCALL	BIT(0)
+#define CPUID_VMWARE_FEATURES_ECX_VMCALL	BIT(1)
+
+extern unsigned long vmware_hypercall_slow(unsigned long cmd,
+					   unsigned long in1, unsigned long in3,
+					   unsigned long in4, unsigned long in5,
+					   u32 *out1, u32 *out2, u32 *out3,
+					   u32 *out4, u32 *out5);
+
+#define VMWARE_TDX_VENDOR_LEAF 0x1af7e4909ULL
+#define VMWARE_TDX_HCALL_FUNC  1
+
+extern unsigned long vmware_tdx_hypercall(unsigned long cmd,
+					  unsigned long in1, unsigned long in3,
+					  unsigned long in4, unsigned long in5,
+					  u32 *out1, u32 *out2, u32 *out3,
+					  u32 *out4, u32 *out5);
 
 /*
- * The high bandwidth in call. The low word of edx is presumed to have the
- * HB bit set.
+ * The low bandwidth call. The low word of %edx is presumed to have OUT bit
+ * set. The high word of %edx may contain input data from the caller.
  */
-#define VMWARE_HYPERCALL_HB_IN						\
-	ALTERNATIVE_2("movw $" __stringify(VMWARE_HYPERVISOR_PORT_HB) ", %%dx; " \
-		      "rep insb",					\
-		      "vmcall", X86_FEATURE_VMCALL,			\
+#define VMWARE_HYPERCALL					\
+	ALTERNATIVE_2("movw %[port], %%dx\n\t"			\
+		      "inl (%%dx), %%eax",			\
+		      "vmcall", X86_FEATURE_VMCALL,		\
 		      "vmmcall", X86_FEATURE_VMW_VMMCALL)
+
+static inline
+unsigned long vmware_hypercall1(unsigned long cmd, unsigned long in1)
+{
+	unsigned long out0;
+
+	if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST))
+		return vmware_tdx_hypercall(cmd, in1, 0, 0, 0,
+					    NULL, NULL, NULL, NULL, NULL);
+
+	if (unlikely(!alternatives_patched) && !__is_defined(MODULE))
+		return vmware_hypercall_slow(cmd, in1, 0, 0, 0,
+					     NULL, NULL, NULL, NULL, NULL);
+
+	asm_inline volatile (VMWARE_HYPERCALL
+		: "=a" (out0)
+		: [port] "i" (VMWARE_HYPERVISOR_PORT),
+		  "a" (VMWARE_HYPERVISOR_MAGIC),
+		  "b" (in1),
+		  "c" (cmd),
+		  "d" (0)
+		: "cc", "memory");
+	return out0;
+}
+
+static inline
+unsigned long vmware_hypercall3(unsigned long cmd, unsigned long in1,
+				u32 *out1, u32 *out2)
+{
+	unsigned long out0;
+
+	if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST))
+		return vmware_tdx_hypercall(cmd, in1, 0, 0, 0,
+					    out1, out2, NULL, NULL, NULL);
+
+	if (unlikely(!alternatives_patched) && !__is_defined(MODULE))
+		return vmware_hypercall_slow(cmd, in1, 0, 0, 0,
+					     out1, out2, NULL, NULL, NULL);
+
+	asm_inline volatile (VMWARE_HYPERCALL
+		: "=a" (out0), "=b" (*out1), "=c" (*out2)
+		: [port] "i" (VMWARE_HYPERVISOR_PORT),
+		  "a" (VMWARE_HYPERVISOR_MAGIC),
+		  "b" (in1),
+		  "c" (cmd),
+		  "d" (0)
+		: "cc", "memory");
+	return out0;
+}
+
+static inline
+unsigned long vmware_hypercall4(unsigned long cmd, unsigned long in1,
+				u32 *out1, u32 *out2, u32 *out3)
+{
+	unsigned long out0;
+
+	if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST))
+		return vmware_tdx_hypercall(cmd, in1, 0, 0, 0,
+					    out1, out2, out3, NULL, NULL);
+
+	if (unlikely(!alternatives_patched) && !__is_defined(MODULE))
+		return vmware_hypercall_slow(cmd, in1, 0, 0, 0,
+					     out1, out2, out3, NULL, NULL);
+
+	asm_inline volatile (VMWARE_HYPERCALL
+		: "=a" (out0), "=b" (*out1), "=c" (*out2), "=d" (*out3)
+		: [port] "i" (VMWARE_HYPERVISOR_PORT),
+		  "a" (VMWARE_HYPERVISOR_MAGIC),
+		  "b" (in1),
+		  "c" (cmd),
+		  "d" (0)
+		: "cc", "memory");
+	return out0;
+}
+
+static inline
+unsigned long vmware_hypercall5(unsigned long cmd, unsigned long in1,
+				unsigned long in3, unsigned long in4,
+				unsigned long in5, u32 *out2)
+{
+	unsigned long out0;
+
+	if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST))
+		return vmware_tdx_hypercall(cmd, in1, in3, in4, in5,
+					    NULL, out2, NULL, NULL, NULL);
+
+	if (unlikely(!alternatives_patched) && !__is_defined(MODULE))
+		return vmware_hypercall_slow(cmd, in1, in3, in4, in5,
+					     NULL, out2, NULL, NULL, NULL);
+
+	asm_inline volatile (VMWARE_HYPERCALL
+		: "=a" (out0), "=c" (*out2)
+		: [port] "i" (VMWARE_HYPERVISOR_PORT),
+		  "a" (VMWARE_HYPERVISOR_MAGIC),
+		  "b" (in1),
+		  "c" (cmd),
+		  "d" (in3),
+		  "S" (in4),
+		  "D" (in5)
+		: "cc", "memory");
+	return out0;
+}
+
+static inline
+unsigned long vmware_hypercall6(unsigned long cmd, unsigned long in1,
+				unsigned long in3, u32 *out2,
+				u32 *out3, u32 *out4, u32 *out5)
+{
+	unsigned long out0;
+
+	if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST))
+		return vmware_tdx_hypercall(cmd, in1, in3, 0, 0,
+					    NULL, out2, out3, out4, out5);
+
+	if (unlikely(!alternatives_patched) && !__is_defined(MODULE))
+		return vmware_hypercall_slow(cmd, in1, in3, 0, 0,
+					     NULL, out2, out3, out4, out5);
+
+	asm_inline volatile (VMWARE_HYPERCALL
+		: "=a" (out0), "=c" (*out2), "=d" (*out3), "=S" (*out4),
+		  "=D" (*out5)
+		: [port] "i" (VMWARE_HYPERVISOR_PORT),
+		  "a" (VMWARE_HYPERVISOR_MAGIC),
+		  "b" (in1),
+		  "c" (cmd),
+		  "d" (in3)
+		: "cc", "memory");
+	return out0;
+}
+
+static inline
+unsigned long vmware_hypercall7(unsigned long cmd, unsigned long in1,
+				unsigned long in3, unsigned long in4,
+				unsigned long in5, u32 *out1,
+				u32 *out2, u32 *out3)
+{
+	unsigned long out0;
+
+	if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST))
+		return vmware_tdx_hypercall(cmd, in1, in3, in4, in5,
+					    out1, out2, out3, NULL, NULL);
+
+	if (unlikely(!alternatives_patched) && !__is_defined(MODULE))
+		return vmware_hypercall_slow(cmd, in1, in3, in4, in5,
+					     out1, out2, out3, NULL, NULL);
+
+	asm_inline volatile (VMWARE_HYPERCALL
+		: "=a" (out0), "=b" (*out1), "=c" (*out2), "=d" (*out3)
+		: [port] "i" (VMWARE_HYPERVISOR_PORT),
+		  "a" (VMWARE_HYPERVISOR_MAGIC),
+		  "b" (in1),
+		  "c" (cmd),
+		  "d" (in3),
+		  "S" (in4),
+		  "D" (in5)
+		: "cc", "memory");
+	return out0;
+}
+
+#ifdef CONFIG_X86_64
+#define VMW_BP_CONSTRAINT "r"
+#else
+#define VMW_BP_CONSTRAINT "m"
+#endif
+
+/*
+ * High bandwidth calls are not supported on encrypted memory guests.
+ * The caller should check cc_platform_has(CC_ATTR_MEM_ENCRYPT) and use
+ * low bandwidth hypercall if memory encryption is set.
+ * This assumption simplifies HB hypercall implementation to just I/O port
+ * based approach without alternative patching.
+ */
+static inline
+unsigned long vmware_hypercall_hb_out(unsigned long cmd, unsigned long in2,
+				      unsigned long in3, unsigned long in4,
+				      unsigned long in5, unsigned long in6,
+				      u32 *out1)
+{
+	unsigned long out0;
+
+	asm_inline volatile (
+		UNWIND_HINT_SAVE
+		"push %%" _ASM_BP "\n\t"
+		UNWIND_HINT_UNDEFINED
+		"mov %[in6], %%" _ASM_BP "\n\t"
+		"rep outsb\n\t"
+		"pop %%" _ASM_BP "\n\t"
+		UNWIND_HINT_RESTORE
+		: "=a" (out0), "=b" (*out1)
+		: "a" (VMWARE_HYPERVISOR_MAGIC),
+		  "b" (cmd),
+		  "c" (in2),
+		  "d" (in3 | VMWARE_HYPERVISOR_PORT_HB),
+		  "S" (in4),
+		  "D" (in5),
+		  [in6] VMW_BP_CONSTRAINT (in6)
+		: "cc", "memory");
+	return out0;
+}
+
+static inline
+unsigned long vmware_hypercall_hb_in(unsigned long cmd, unsigned long in2,
+				     unsigned long in3, unsigned long in4,
+				     unsigned long in5, unsigned long in6,
+				     u32 *out1)
+{
+	unsigned long out0;
+
+	asm_inline volatile (
+		UNWIND_HINT_SAVE
+		"push %%" _ASM_BP "\n\t"
+		UNWIND_HINT_UNDEFINED
+		"mov %[in6], %%" _ASM_BP "\n\t"
+		"rep insb\n\t"
+		"pop %%" _ASM_BP "\n\t"
+		UNWIND_HINT_RESTORE
+		: "=a" (out0), "=b" (*out1)
+		: "a" (VMWARE_HYPERVISOR_MAGIC),
+		  "b" (cmd),
+		  "c" (in2),
+		  "d" (in3 | VMWARE_HYPERVISOR_PORT_HB),
+		  "S" (in4),
+		  "D" (in5),
+		  [in6] VMW_BP_CONSTRAINT (in6)
+		: "cc", "memory");
+	return out0;
+}
+#undef VMW_BP_CONSTRAINT
+#undef VMWARE_HYPERCALL
+
 #endif