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/* SPDX-License-Identifier: GPL-2.0 or MIT */
#ifndef _ASM_X86_VMWARE_H
#define _ASM_X86_VMWARE_H
#include <asm/cpufeatures.h>
#include <asm/alternative.h>
#include <linux/stringify.h>
/*
* 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 arg3 by any user and are automatically replaced by the port
* number if the I/O port method is used.
*/
#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)
#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
/*
* Hypercall command mask:
* bits [6:0] command, range [0, 127]
* bits [19:16] sub-command, range [0, 15]
*/
#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 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 \
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
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