| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __KVM_X86_VMX_INSN_H |
| #define __KVM_X86_VMX_INSN_H |
| |
| #include <linux/nospec.h> |
| |
| #include <asm/vmx.h> |
| |
| #include "evmcs.h" |
| #include "vmcs.h" |
| #include "x86.h" |
| |
| asmlinkage void vmread_error(unsigned long field, bool fault); |
| __attribute__((regparm(0))) void vmread_error_trampoline(unsigned long field, |
| bool fault); |
| void vmwrite_error(unsigned long field, unsigned long value); |
| void vmclear_error(struct vmcs *vmcs, u64 phys_addr); |
| void vmptrld_error(struct vmcs *vmcs, u64 phys_addr); |
| void invvpid_error(unsigned long ext, u16 vpid, gva_t gva); |
| void invept_error(unsigned long ext, u64 eptp, gpa_t gpa); |
| |
| 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) & 0x6001) == 0x2000, |
| "32-bit accessor invalid for 64-bit field"); |
| BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001, |
| "32-bit accessor invalid for 64-bit high 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("1: vmread %2, %1\n\t" |
| ".byte 0x3e\n\t" /* branch taken hint */ |
| "ja 3f\n\t" |
| |
| /* |
| * VMREAD failed. Push '0' for @fault, push the failing |
| * @field, and bounce through the trampoline to preserve |
| * volatile registers. |
| */ |
| "push $0\n\t" |
| "push %2\n\t" |
| "2:call vmread_error_trampoline\n\t" |
| |
| /* |
| * Unwind the stack. Note, the trampoline zeros out the |
| * memory for @fault so that the result is '0' on error. |
| */ |
| "pop %2\n\t" |
| "pop %1\n\t" |
| "3:\n\t" |
| |
| /* VMREAD faulted. As above, except push '1' for @fault. */ |
| ".pushsection .fixup, \"ax\"\n\t" |
| "4: push $1\n\t" |
| "push %2\n\t" |
| "jmp 2b\n\t" |
| ".popsection\n\t" |
| _ASM_EXTABLE(1b, 4b) |
| : ASM_CALL_CONSTRAINT, "=r"(value) : "r"(field) : "cc"); |
| 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); |
| } |
| |
| #define vmx_asm1(insn, op1, error_args...) \ |
| do { \ |
| asm_volatile_goto("1: " __stringify(insn) " %0\n\t" \ |
| ".byte 0x2e\n\t" /* branch not taken hint */ \ |
| "jna %l[error]\n\t" \ |
| _ASM_EXTABLE(1b, %l[fault]) \ |
| : : op1 : "cc" : error, fault); \ |
| return; \ |
| error: \ |
| instrumentation_begin(); \ |
| insn##_error(error_args); \ |
| instrumentation_end(); \ |
| return; \ |
| fault: \ |
| kvm_spurious_fault(); \ |
| } while (0) |
| |
| #define vmx_asm2(insn, op1, op2, error_args...) \ |
| do { \ |
| asm_volatile_goto("1: " __stringify(insn) " %1, %0\n\t" \ |
| ".byte 0x2e\n\t" /* branch not taken hint */ \ |
| "jna %l[error]\n\t" \ |
| _ASM_EXTABLE(1b, %l[fault]) \ |
| : : op1, op2 : "cc" : error, fault); \ |
| return; \ |
| error: \ |
| instrumentation_begin(); \ |
| insn##_error(error_args); \ |
| instrumentation_end(); \ |
| return; \ |
| fault: \ |
| kvm_spurious_fault(); \ |
| } while (0) |
| |
| static __always_inline void __vmcs_writel(unsigned long field, unsigned long value) |
| { |
| vmx_asm2(vmwrite, "r"(field), "rm"(value), 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 |
| __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); |
| |
| vmx_asm1(vmclear, "m"(phys_addr), vmcs, phys_addr); |
| } |
| |
| static inline void vmcs_load(struct vmcs *vmcs) |
| { |
| u64 phys_addr = __pa(vmcs); |
| |
| if (static_branch_unlikely(&enable_evmcs)) |
| return evmcs_load(phys_addr); |
| |
| vmx_asm1(vmptrld, "m"(phys_addr), 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 }; |
| |
| vmx_asm2(invvpid, "r"(ext), "m"(operand), ext, vpid, gva); |
| } |
| |
| static inline void __invept(unsigned long ext, u64 eptp, gpa_t gpa) |
| { |
| struct { |
| u64 eptp, gpa; |
| } operand = {eptp, gpa}; |
| |
| vmx_asm2(invept, "r"(ext), "m"(operand), ext, eptp, gpa); |
| } |
| |
| static inline void vpid_sync_vcpu_single(int vpid) |
| { |
| if (vpid == 0) |
| return; |
| |
| __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vpid, 0); |
| } |
| |
| static inline void vpid_sync_vcpu_global(void) |
| { |
| __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 if (vpid != 0) |
| vpid_sync_vcpu_global(); |
| } |
| |
| static inline void vpid_sync_vcpu_addr(int vpid, gva_t addr) |
| { |
| if (vpid == 0) |
| return; |
| |
| if (cpu_has_vmx_invvpid_individual_addr()) |
| __invvpid(VMX_VPID_EXTENT_INDIVIDUAL_ADDR, vpid, addr); |
| else |
| vpid_sync_context(vpid); |
| } |
| |
| 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 */ |
