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Merge branch 'for-next/pkvm-guest' into for-next/core

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* for-next/pkvm-guest:
  arm64: smccc: Reserve block of KVM "vendor" services for pKVM hypercalls
  drivers/virt: pkvm: Intercept ioremap using pKVM MMIO_GUARD hypercall
  arm64: mm: Add confidential computing hook to ioremap_prot()
  drivers/virt: pkvm: Hook up mem_encrypt API using pKVM hypercalls
  arm64: mm: Add top-level dispatcher for internal mem_encrypt API
  drivers/virt: pkvm: Add initial support for running as a protected guest
  firmware/smccc: Call arch-specific hook on discovering KVM services
This commit is contained in:
Will Deacon 2024-09-12 13:43:22 +01:00
commit 3175e051c3
17 changed files with 437 additions and 2 deletions
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98
Documentation/virt/kvm/arm/hypercalls.rst
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@ -44,3 +44,101 @@ Provides a discovery mechanism for other KVM/arm64 hypercalls.
----------------------------------------
See ptp_kvm.rst
``ARM_SMCCC_KVM_FUNC_HYP_MEMINFO``
----------------------------------
Query the memory protection parameters for a pKVM protected virtual machine.
+---------------------+-------------------------------------------------------------+
| Presence: | Optional; pKVM protected guests only. |
+---------------------+-------------------------------------------------------------+
| Calling convention: | HVC64 |
+---------------------+----------+--------------------------------------------------+
| Function ID: | (uint32) | 0xC6000002 |
+---------------------+----------+----+---------------------------------------------+
| Arguments: | (uint64) | R1 | Reserved / Must be zero |
| +----------+----+---------------------------------------------+
| | (uint64) | R2 | Reserved / Must be zero |
| +----------+----+---------------------------------------------+
| | (uint64) | R3 | Reserved / Must be zero |
+---------------------+----------+----+---------------------------------------------+
| Return Values: | (int64) | R0 | ``INVALID_PARAMETER (-3)`` on error, else |
| | | | memory protection granule in bytes |
+---------------------+----------+----+---------------------------------------------+
``ARM_SMCCC_KVM_FUNC_MEM_SHARE``
--------------------------------
Share a region of memory with the KVM host, granting it read, write and execute
permissions. The size of the region is equal to the memory protection granule
advertised by ``ARM_SMCCC_KVM_FUNC_HYP_MEMINFO``.
+---------------------+-------------------------------------------------------------+
| Presence: | Optional; pKVM protected guests only. |
+---------------------+-------------------------------------------------------------+
| Calling convention: | HVC64 |
+---------------------+----------+--------------------------------------------------+
| Function ID: | (uint32) | 0xC6000003 |
+---------------------+----------+----+---------------------------------------------+
| Arguments: | (uint64) | R1 | Base IPA of memory region to share |
| +----------+----+---------------------------------------------+
| | (uint64) | R2 | Reserved / Must be zero |
| +----------+----+---------------------------------------------+
| | (uint64) | R3 | Reserved / Must be zero |
+---------------------+----------+----+---------------------------------------------+
| Return Values: | (int64) | R0 | ``SUCCESS (0)`` |
| | | +---------------------------------------------+
| | | | ``INVALID_PARAMETER (-3)`` |
+---------------------+----------+----+---------------------------------------------+
``ARM_SMCCC_KVM_FUNC_MEM_UNSHARE``
----------------------------------
Revoke access permission from the KVM host to a memory region previously shared
with ``ARM_SMCCC_KVM_FUNC_MEM_SHARE``. The size of the region is equal to the
memory protection granule advertised by ``ARM_SMCCC_KVM_FUNC_HYP_MEMINFO``.
+---------------------+-------------------------------------------------------------+
| Presence: | Optional; pKVM protected guests only. |
+---------------------+-------------------------------------------------------------+
| Calling convention: | HVC64 |
+---------------------+----------+--------------------------------------------------+
| Function ID: | (uint32) | 0xC6000004 |
+---------------------+----------+----+---------------------------------------------+
| Arguments: | (uint64) | R1 | Base IPA of memory region to unshare |
| +----------+----+---------------------------------------------+
| | (uint64) | R2 | Reserved / Must be zero |
| +----------+----+---------------------------------------------+
| | (uint64) | R3 | Reserved / Must be zero |
+---------------------+----------+----+---------------------------------------------+
| Return Values: | (int64) | R0 | ``SUCCESS (0)`` |
| | | +---------------------------------------------+
| | | | ``INVALID_PARAMETER (-3)`` |
+---------------------+----------+----+---------------------------------------------+
``ARM_SMCCC_KVM_FUNC_MMIO_GUARD``
----------------------------------
Request that a given memory region is handled as MMIO by the hypervisor,
allowing accesses to this region to be emulated by the KVM host. The size of the
region is equal to the memory protection granule advertised by
``ARM_SMCCC_KVM_FUNC_HYP_MEMINFO``.
+---------------------+-------------------------------------------------------------+
| Presence: | Optional; pKVM protected guests only. |
+---------------------+-------------------------------------------------------------+
| Calling convention: | HVC64 |
+---------------------+----------+--------------------------------------------------+
| Function ID: | (uint32) | 0xC6000007 |
+---------------------+----------+----+---------------------------------------------+
| Arguments: | (uint64) | R1 | Base IPA of MMIO memory region |
| +----------+----+---------------------------------------------+
| | (uint64) | R2 | Reserved / Must be zero |
| +----------+----+---------------------------------------------+
| | (uint64) | R3 | Reserved / Must be zero |
+---------------------+----------+----+---------------------------------------------+
| Return Values: | (int64) | R0 | ``SUCCESS (0)`` |
| | | +---------------------------------------------+
| | | | ``INVALID_PARAMETER (-3)`` |
+---------------------+----------+----+---------------------------------------------+

2
arch/arm/include/asm/hypervisor.h
View File

@ -7,4 +7,6 @@
void kvm_init_hyp_services(void);
bool kvm_arm_hyp_service_available(u32 func_id);
static inline void kvm_arch_init_hyp_services(void) { };
#endif

1
arch/arm64/Kconfig
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@ -34,6 +34,7 @@ config ARM64
select ARCH_HAS_KERNEL_FPU_SUPPORT if KERNEL_MODE_NEON
select ARCH_HAS_KEEPINITRD
select ARCH_HAS_MEMBARRIER_SYNC_CORE
select ARCH_HAS_MEM_ENCRYPT
select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
select ARCH_HAS_PTE_DEVMAP

11
arch/arm64/include/asm/hypervisor.h
View File

@ -7,4 +7,15 @@
void kvm_init_hyp_services(void);
bool kvm_arm_hyp_service_available(u32 func_id);
#ifdef CONFIG_ARM_PKVM_GUEST
void pkvm_init_hyp_services(void);
#else
static inline void pkvm_init_hyp_services(void) { };
#endif
static inline void kvm_arch_init_hyp_services(void)
{
pkvm_init_hyp_services();
};
#endif

4
arch/arm64/include/asm/io.h
View File

@ -271,6 +271,10 @@ __iowrite64_copy(void __iomem *to, const void *from, size_t count)
* I/O memory mapping functions.
*/
typedef int (*ioremap_prot_hook_t)(phys_addr_t phys_addr, size_t size,
pgprot_t *prot);
int arm64_ioremap_prot_hook_register(const ioremap_prot_hook_t hook);
#define ioremap_prot ioremap_prot
#define _PAGE_IOREMAP PROT_DEVICE_nGnRE

15
arch/arm64/include/asm/mem_encrypt.h Normal file
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@ -0,0 +1,15 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __ASM_MEM_ENCRYPT_H
#define __ASM_MEM_ENCRYPT_H
struct arm64_mem_crypt_ops {
int (*encrypt)(unsigned long addr, int numpages);
int (*decrypt)(unsigned long addr, int numpages);
};
int arm64_mem_crypt_ops_register(const struct arm64_mem_crypt_ops *ops);
int set_memory_encrypted(unsigned long addr, int numpages);
int set_memory_decrypted(unsigned long addr, int numpages);
#endif /* __ASM_MEM_ENCRYPT_H */

1
arch/arm64/include/asm/set_memory.h
View File

@ -3,6 +3,7 @@
#ifndef _ASM_ARM64_SET_MEMORY_H
#define _ASM_ARM64_SET_MEMORY_H
#include <asm/mem_encrypt.h>
#include <asm-generic/set_memory.h>
bool can_set_direct_map(void);

2
arch/arm64/mm/Makefile
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@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
obj-y := dma-mapping.o extable.o fault.o init.o \
cache.o copypage.o flush.o \
ioremap.o mmap.o pgd.o mmu.o \
ioremap.o mmap.o pgd.o mem_encrypt.o mmu.o \
context.o proc.o pageattr.o fixmap.o
obj-$(CONFIG_ARM64_CONTPTE) += contpte.o
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o

23
arch/arm64/mm/ioremap.c
View File

@ -3,10 +3,22 @@
#include <linux/mm.h>
#include <linux/io.h>
static ioremap_prot_hook_t ioremap_prot_hook;
int arm64_ioremap_prot_hook_register(ioremap_prot_hook_t hook)
{
if (WARN_ON(ioremap_prot_hook))
return -EBUSY;
ioremap_prot_hook = hook;
return 0;
}
void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
unsigned long prot)
{
unsigned long last_addr = phys_addr + size - 1;
pgprot_t pgprot = __pgprot(prot);
/* Don't allow outside PHYS_MASK */
if (last_addr & ~PHYS_MASK)
@ -16,7 +28,16 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
if (WARN_ON(pfn_is_map_memory(__phys_to_pfn(phys_addr))))
return NULL;
return generic_ioremap_prot(phys_addr, size, __pgprot(prot));
/*
* If a hook is registered (e.g. for confidential computing
* purposes), call that now and barf if it fails.
*/
if (unlikely(ioremap_prot_hook) &&
WARN_ON(ioremap_prot_hook(phys_addr, size, &pgprot))) {
return NULL;
}
return generic_ioremap_prot(phys_addr, size, pgprot);
}
EXPORT_SYMBOL(ioremap_prot);

50
arch/arm64/mm/mem_encrypt.c Normal file
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@ -0,0 +1,50 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Implementation of the memory encryption/decryption API.
*
* Since the low-level details of the operation depend on the
* Confidential Computing environment (e.g. pKVM, CCA, ...), this just
* acts as a top-level dispatcher to whatever hooks may have been
* registered.
*
* Author: Will Deacon <will@kernel.org>
* Copyright (C) 2024 Google LLC
*
* "Hello, boils and ghouls!"
*/
#include <linux/bug.h>
#include <linux/compiler.h>
#include <linux/err.h>
#include <linux/mm.h>
#include <asm/mem_encrypt.h>
static const struct arm64_mem_crypt_ops *crypt_ops;
int arm64_mem_crypt_ops_register(const struct arm64_mem_crypt_ops *ops)
{
if (WARN_ON(crypt_ops))
return -EBUSY;
crypt_ops = ops;
return 0;
}
int set_memory_encrypted(unsigned long addr, int numpages)
{
if (likely(!crypt_ops) || WARN_ON(!PAGE_ALIGNED(addr)))
return 0;
return crypt_ops->encrypt(addr, numpages);
}
EXPORT_SYMBOL_GPL(set_memory_encrypted);
int set_memory_decrypted(unsigned long addr, int numpages)
{
if (likely(!crypt_ops) || WARN_ON(!PAGE_ALIGNED(addr)))
return 0;
return crypt_ops->decrypt(addr, numpages);
}
EXPORT_SYMBOL_GPL(set_memory_decrypted);

2
drivers/firmware/smccc/kvm_guest.c
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@ -39,6 +39,8 @@ void __init kvm_init_hyp_services(void)
pr_info("hypervisor services detected (0x%08lx 0x%08lx 0x%08lx 0x%08lx)\n",
res.a3, res.a2, res.a1, res.a0);
kvm_arch_init_hyp_services();
}
bool kvm_arm_hyp_service_available(u32 func_id)

2
drivers/virt/coco/Kconfig
View File

@ -9,6 +9,8 @@ config TSM_REPORTS
source "drivers/virt/coco/efi_secret/Kconfig"
source "drivers/virt/coco/pkvm-guest/Kconfig"
source "drivers/virt/coco/sev-guest/Kconfig"
source "drivers/virt/coco/tdx-guest/Kconfig"

1
drivers/virt/coco/Makefile
View File

@ -4,5 +4,6 @@
#
obj-$(CONFIG_TSM_REPORTS) += tsm.o
obj-$(CONFIG_EFI_SECRET) += efi_secret/
obj-$(CONFIG_ARM_PKVM_GUEST) += pkvm-guest/
obj-$(CONFIG_SEV_GUEST) += sev-guest/
obj-$(CONFIG_INTEL_TDX_GUEST) += tdx-guest/

10
drivers/virt/coco/pkvm-guest/Kconfig Normal file
View File

@ -0,0 +1,10 @@
config ARM_PKVM_GUEST
bool "Arm pKVM protected guest driver"
depends on ARM64
help
Protected guests running under the pKVM hypervisor on arm64
are isolated from the host and must issue hypercalls to enable
interaction with virtual devices. This driver implements
support for probing and issuing these hypercalls.
If unsure, say 'N'.

2
drivers/virt/coco/pkvm-guest/Makefile Normal file
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@ -0,0 +1,2 @@
# SPDX-License-Identifier: GPL-2.0-only
obj-$(CONFIG_ARM_PKVM_GUEST) += arm-pkvm-guest.o

127
drivers/virt/coco/pkvm-guest/arm-pkvm-guest.c Normal file
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@ -0,0 +1,127 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Support for the hypercall interface exposed to protected guests by
* pKVM.
*
* Author: Will Deacon <will@kernel.org>
* Copyright (C) 2024 Google LLC
*/
#include <linux/arm-smccc.h>
#include <linux/array_size.h>
#include <linux/io.h>
#include <linux/mem_encrypt.h>
#include <linux/mm.h>
#include <linux/pgtable.h>
#include <asm/hypervisor.h>
static size_t pkvm_granule;
static int arm_smccc_do_one_page(u32 func_id, phys_addr_t phys)
{
phys_addr_t end = phys + PAGE_SIZE;
while (phys < end) {
struct arm_smccc_res res;
arm_smccc_1_1_invoke(func_id, phys, 0, 0, &res);
if (res.a0 != SMCCC_RET_SUCCESS)
return -EPERM;
phys += pkvm_granule;
}
return 0;
}
static int __set_memory_range(u32 func_id, unsigned long start, int numpages)
{
void *addr = (void *)start, *end = addr + numpages * PAGE_SIZE;
while (addr < end) {
int err;
err = arm_smccc_do_one_page(func_id, virt_to_phys(addr));
if (err)
return err;
addr += PAGE_SIZE;
}
return 0;
}
static int pkvm_set_memory_encrypted(unsigned long addr, int numpages)
{
return __set_memory_range(ARM_SMCCC_VENDOR_HYP_KVM_MEM_UNSHARE_FUNC_ID,
addr, numpages);
}
static int pkvm_set_memory_decrypted(unsigned long addr, int numpages)
{
return __set_memory_range(ARM_SMCCC_VENDOR_HYP_KVM_MEM_SHARE_FUNC_ID,
addr, numpages);
}
static const struct arm64_mem_crypt_ops pkvm_crypt_ops = {
.encrypt = pkvm_set_memory_encrypted,
.decrypt = pkvm_set_memory_decrypted,
};
static int mmio_guard_ioremap_hook(phys_addr_t phys, size_t size,
pgprot_t *prot)
{
phys_addr_t end;
pteval_t protval = pgprot_val(*prot);
/*
* We only expect MMIO emulation for regions mapped with device
* attributes.
*/
if (protval != PROT_DEVICE_nGnRE && protval != PROT_DEVICE_nGnRnE)
return 0;
phys = PAGE_ALIGN_DOWN(phys);
end = phys + PAGE_ALIGN(size);
while (phys < end) {
const int func_id = ARM_SMCCC_VENDOR_HYP_KVM_MMIO_GUARD_FUNC_ID;
int err;
err = arm_smccc_do_one_page(func_id, phys);
if (err)
return err;
phys += PAGE_SIZE;
}
return 0;
}
void pkvm_init_hyp_services(void)
{
int i;
struct arm_smccc_res res;
const u32 funcs[] = {
ARM_SMCCC_KVM_FUNC_HYP_MEMINFO,
ARM_SMCCC_KVM_FUNC_MEM_SHARE,
ARM_SMCCC_KVM_FUNC_MEM_UNSHARE,
};
for (i = 0; i < ARRAY_SIZE(funcs); ++i) {
if (!kvm_arm_hyp_service_available(funcs[i]))
return;
}
arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_KVM_HYP_MEMINFO_FUNC_ID,
0, 0, 0, &res);
if (res.a0 > PAGE_SIZE) /* Includes error codes */
return;
pkvm_granule = res.a0;
arm64_mem_crypt_ops_register(&pkvm_crypt_ops);
if (kvm_arm_hyp_service_available(ARM_SMCCC_KVM_FUNC_MMIO_GUARD))
arm64_ioremap_prot_hook_register(&mmio_guard_ioremap_hook);
}

88
include/linux/arm-smccc.h
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@ -115,6 +115,70 @@
/* KVM "vendor specific" services */
#define ARM_SMCCC_KVM_FUNC_FEATURES 0
#define ARM_SMCCC_KVM_FUNC_PTP 1
/* Start of pKVM hypercall range */
#define ARM_SMCCC_KVM_FUNC_HYP_MEMINFO 2
#define ARM_SMCCC_KVM_FUNC_MEM_SHARE 3
#define ARM_SMCCC_KVM_FUNC_MEM_UNSHARE 4
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_5 5
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_6 6
#define ARM_SMCCC_KVM_FUNC_MMIO_GUARD 7
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_8 8
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_9 9
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_10 10
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_11 11
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_12 12
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_13 13
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_14 14
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_15 15
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_16 16
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_17 17
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_18 18
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_19 19
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_20 20
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_21 21
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_22 22
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_23 23
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_24 24
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_25 25
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_26 26
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_27 27
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_28 28
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_29 29
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_30 30
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_31 31
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_32 32
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_33 33
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_34 34
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_35 35
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_36 36
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_37 37
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_38 38
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_39 39
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_40 40
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_41 41
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_42 42
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_43 43
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_44 44
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_45 45
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_46 46
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_47 47
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_48 48
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_49 49
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_50 50
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_51 51
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_52 52
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_53 53
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_54 54
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_55 55
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_56 56
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_57 57
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_58 58
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_59 59
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_60 60
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_61 61
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_62 62
#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_63 63
/* End of pKVM hypercall range */
#define ARM_SMCCC_KVM_FUNC_FEATURES_2 127
#define ARM_SMCCC_KVM_NUM_FUNCS 128
@ -137,6 +201,30 @@
ARM_SMCCC_OWNER_VENDOR_HYP, \
ARM_SMCCC_KVM_FUNC_PTP)
#define ARM_SMCCC_VENDOR_HYP_KVM_HYP_MEMINFO_FUNC_ID \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
ARM_SMCCC_SMC_64, \
ARM_SMCCC_OWNER_VENDOR_HYP, \
ARM_SMCCC_KVM_FUNC_HYP_MEMINFO)
#define ARM_SMCCC_VENDOR_HYP_KVM_MEM_SHARE_FUNC_ID \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
ARM_SMCCC_SMC_64, \
ARM_SMCCC_OWNER_VENDOR_HYP, \
ARM_SMCCC_KVM_FUNC_MEM_SHARE)
#define ARM_SMCCC_VENDOR_HYP_KVM_MEM_UNSHARE_FUNC_ID \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
ARM_SMCCC_SMC_64, \
ARM_SMCCC_OWNER_VENDOR_HYP, \
ARM_SMCCC_KVM_FUNC_MEM_UNSHARE)
#define ARM_SMCCC_VENDOR_HYP_KVM_MMIO_GUARD_FUNC_ID \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
ARM_SMCCC_SMC_64, \
ARM_SMCCC_OWNER_VENDOR_HYP, \
ARM_SMCCC_KVM_FUNC_MMIO_GUARD)
/* ptp_kvm counter type ID */
#define KVM_PTP_VIRT_COUNTER 0
#define KVM_PTP_PHYS_COUNTER 1