arch/x86/kvm/vmx/ops.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __KVM_X86_VMX_INSN_H
#define __KVM_X86_VMX_INSN_H

#include <linux/nospec.h>

#include <asm/kvm_host.h>
#include <asm/vmx.h>

#include "evmcs.h"
#include "vmcs.h"

#define __ex(x) __kvm_handle_fault_on_reboot(x)
#define __ex_clear(x, reg) \
	____kvm_handle_fault_on_reboot(x, "xor " reg ", " reg)

static __always_inline void vmcs_check16(unsigned long field)
{
	BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000,
			 "16-bit accessor invalid for 64-bit field");
	BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
			 "16-bit accessor invalid for 64-bit high field");
	BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
			 "16-bit accessor invalid for 32-bit high field");
	BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
			 "16-bit accessor invalid for natural width field");
}

static __always_inline void vmcs_check32(unsigned long field)
{
	BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
			 "32-bit accessor invalid for 16-bit field");
	BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
			 "32-bit accessor invalid for natural width field");
}

static __always_inline void vmcs_check64(unsigned long field)
{
	BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
			 "64-bit accessor invalid for 16-bit field");
	BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
			 "64-bit accessor invalid for 64-bit high field");
	BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
			 "64-bit accessor invalid for 32-bit field");
	BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
			 "64-bit accessor invalid for natural width field");
}

static __always_inline void vmcs_checkl(unsigned long field)
{
	BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
			 "Natural width accessor invalid for 16-bit field");
	BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000,
			 "Natural width accessor invalid for 64-bit field");
	BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
			 "Natural width accessor invalid for 64-bit high field");
	BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
			 "Natural width accessor invalid for 32-bit field");
}

static __always_inline unsigned long __vmcs_readl(unsigned long field)
{
	unsigned long value;

	asm volatile (__ex_clear("vmread %1, %0", "%k0")
		      : "=r"(value) : "r"(field));
	return value;
}

static __always_inline u16 vmcs_read16(unsigned long field)
{
	vmcs_check16(field);
	if (static_branch_unlikely(&enable_evmcs))
		return evmcs_read16(field);
	return __vmcs_readl(field);
}

static __always_inline u32 vmcs_read32(unsigned long field)
{
	vmcs_check32(field);
	if (static_branch_unlikely(&enable_evmcs))
		return evmcs_read32(field);
	return __vmcs_readl(field);
}

static __always_inline u64 vmcs_read64(unsigned long field)
{
	vmcs_check64(field);
	if (static_branch_unlikely(&enable_evmcs))
		return evmcs_read64(field);
#ifdef CONFIG_X86_64
	return __vmcs_readl(field);
#else
	return __vmcs_readl(field) | ((u64)__vmcs_readl(field+1) << 32);
#endif
}

static __always_inline unsigned long vmcs_readl(unsigned long field)
{
	vmcs_checkl(field);
	if (static_branch_unlikely(&enable_evmcs))
		return evmcs_read64(field);
	return __vmcs_readl(field);
}

static noinline void vmwrite_error(unsigned long field, unsigned long value)
{
	printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n",
	       field, value, vmcs_read32(VM_INSTRUCTION_ERROR));
	dump_stack();
}

static __always_inline void __vmcs_writel(unsigned long field, unsigned long value)
{
	bool error;

	asm volatile (__ex("vmwrite %2, %1") CC_SET(na)
		      : CC_OUT(na) (error) : "r"(field), "rm"(value));
	if (unlikely(error))
		vmwrite_error(field, value);
}

static __always_inline void vmcs_write16(unsigned long field, u16 value)
{
	vmcs_check16(field);
	if (static_branch_unlikely(&enable_evmcs))
		return evmcs_write16(field, value);

	__vmcs_writel(field, value);
}

static __always_inline void vmcs_write32(unsigned long field, u32 value)
{
	vmcs_check32(field);
	if (static_branch_unlikely(&enable_evmcs))
		return evmcs_write32(field, value);

	__vmcs_writel(field, value);
}

static __always_inline void vmcs_write64(unsigned long field, u64 value)
{
	vmcs_check64(field);
	if (static_branch_unlikely(&enable_evmcs))
		return evmcs_write64(field, value);

	__vmcs_writel(field, value);
#ifndef CONFIG_X86_64
	asm volatile ("");
	__vmcs_writel(field+1, value >> 32);
#endif
}

static __always_inline void vmcs_writel(unsigned long field, unsigned long value)
{
	vmcs_checkl(field);
	if (static_branch_unlikely(&enable_evmcs))
		return evmcs_write64(field, value);

	__vmcs_writel(field, value);
}

static __always_inline void vmcs_clear_bits(unsigned long field, u32 mask)
{
	BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000,
			 "vmcs_clear_bits does not support 64-bit fields");
	if (static_branch_unlikely(&enable_evmcs))
		return evmcs_write32(field, evmcs_read32(field) & ~mask);

	__vmcs_writel(field, __vmcs_readl(field) & ~mask);
}

static __always_inline void vmcs_set_bits(unsigned long field, u32 mask)
{
	BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000,
			 "vmcs_set_bits does not support 64-bit fields");
	if (static_branch_unlikely(&enable_evmcs))
		return evmcs_write32(field, evmcs_read32(field) | mask);

	__vmcs_writel(field, __vmcs_readl(field) | mask);
}

static inline void vmcs_clear(struct vmcs *vmcs)
{
	u64 phys_addr = __pa(vmcs);
	bool error;

	asm volatile (__ex("vmclear %1") CC_SET(na)
		      : CC_OUT(na) (error) : "m"(phys_addr));
	if (unlikely(error))
		printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n",
		       vmcs, phys_addr);
}

static inline void vmcs_load(struct vmcs *vmcs)
{
	u64 phys_addr = __pa(vmcs);
	bool error;

	if (static_branch_unlikely(&enable_evmcs))
		return evmcs_load(phys_addr);

	asm volatile (__ex("vmptrld %1") CC_SET(na)
		      : CC_OUT(na) (error) : "m"(phys_addr));
	if (unlikely(error))
		printk(KERN_ERR "kvm: vmptrld %p/%llx failed\n",
		       vmcs, phys_addr);
}

static inline void __invvpid(unsigned long ext, u16 vpid, gva_t gva)
{
	struct {
		u64 vpid : 16;
		u64 rsvd : 48;
		u64 gva;
	} operand = { vpid, 0, gva };
	bool error;

	asm volatile (__ex("invvpid %2, %1") CC_SET(na)
		      : CC_OUT(na) (error) : "r"(ext), "m"(operand));
	BUG_ON(error);
}

static inline void __invept(unsigned long ext, u64 eptp, gpa_t gpa)
{
	struct {
		u64 eptp, gpa;
	} operand = {eptp, gpa};
	bool error;

	asm volatile (__ex("invept %2, %1") CC_SET(na)
		      : CC_OUT(na) (error) : "r"(ext), "m"(operand));
	BUG_ON(error);
}

static inline bool vpid_sync_vcpu_addr(int vpid, gva_t addr)
{
	if (vpid == 0)
		return true;

	if (cpu_has_vmx_invvpid_individual_addr()) {
		__invvpid(VMX_VPID_EXTENT_INDIVIDUAL_ADDR, vpid, addr);
		return true;
	}

	return false;
}

static inline void vpid_sync_vcpu_single(int vpid)
{
	if (vpid == 0)
		return;

	if (cpu_has_vmx_invvpid_single())
		__invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vpid, 0);
}

static inline void vpid_sync_vcpu_global(void)
{
	if (cpu_has_vmx_invvpid_global())
		__invvpid(VMX_VPID_EXTENT_ALL_CONTEXT, 0, 0);
}

static inline void vpid_sync_context(int vpid)
{
	if (cpu_has_vmx_invvpid_single())
		vpid_sync_vcpu_single(vpid);
	else
		vpid_sync_vcpu_global();
}

static inline void ept_sync_global(void)
{
	__invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
}

static inline void ept_sync_context(u64 eptp)
{
	if (cpu_has_vmx_invept_context())
		__invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
	else
		ept_sync_global();
}

#endif /* __KVM_X86_VMX_INSN_H */