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KVM: VMX: Move VMX instruction wrappers to a dedicated header file
VMX has a few hundred lines of code just to wrap various VMX specific instructions, e.g. VMWREAD, INVVPID, etc... Move them to a dedicated header so it's easier to find/isolate the boilerplate. With this change, more inlines can be moved from vmx.c to vmx.h. Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Sean Christopherson
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Paolo Bonzini
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Dec 14, 2018
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,285 @@ | ||
| /* SPDX-License-Identifier: GPL-2.0 */ | ||
| #ifndef __KVM_X86_VMX_INSN_H | ||
| #define __KVM_X86_VMX_INSN_H | ||
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| #include <linux/nospec.h> | ||
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| #include <asm/kvm_host.h> | ||
| #include <asm/vmx.h> | ||
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| #include "evmcs.h" | ||
| #include "vmcs.h" | ||
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| #define __ex(x) __kvm_handle_fault_on_reboot(x) | ||
| #define __ex_clear(x, reg) \ | ||
| ____kvm_handle_fault_on_reboot(x, "xor " reg ", " reg) | ||
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| 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"); | ||
| } | ||
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| 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"); | ||
| } | ||
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| 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"); | ||
| } | ||
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| 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"); | ||
| } | ||
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| static __always_inline unsigned long __vmcs_readl(unsigned long field) | ||
| { | ||
| unsigned long value; | ||
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| asm volatile (__ex_clear("vmread %1, %0", "%k0") | ||
| : "=r"(value) : "r"(field)); | ||
| return value; | ||
| } | ||
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| 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); | ||
| } | ||
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| 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); | ||
| } | ||
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| 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 | ||
| } | ||
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| 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); | ||
| } | ||
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| 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(); | ||
| } | ||
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| static __always_inline void __vmcs_writel(unsigned long field, unsigned long value) | ||
| { | ||
| bool error; | ||
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| asm volatile (__ex("vmwrite %2, %1") CC_SET(na) | ||
| : CC_OUT(na) (error) : "r"(field), "rm"(value)); | ||
| if (unlikely(error)) | ||
| vmwrite_error(field, value); | ||
| } | ||
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| 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); | ||
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| __vmcs_writel(field, value); | ||
| } | ||
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| 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); | ||
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| __vmcs_writel(field, value); | ||
| } | ||
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| 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); | ||
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| __vmcs_writel(field, value); | ||
| #ifndef CONFIG_X86_64 | ||
| asm volatile (""); | ||
| __vmcs_writel(field+1, value >> 32); | ||
| #endif | ||
| } | ||
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| 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); | ||
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| __vmcs_writel(field, value); | ||
| } | ||
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| 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); | ||
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| __vmcs_writel(field, __vmcs_readl(field) & ~mask); | ||
| } | ||
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| 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); | ||
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| __vmcs_writel(field, __vmcs_readl(field) | mask); | ||
| } | ||
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| static inline void vmcs_clear(struct vmcs *vmcs) | ||
| { | ||
| u64 phys_addr = __pa(vmcs); | ||
| bool error; | ||
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| 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); | ||
| } | ||
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| static inline void vmcs_load(struct vmcs *vmcs) | ||
| { | ||
| u64 phys_addr = __pa(vmcs); | ||
| bool error; | ||
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| if (static_branch_unlikely(&enable_evmcs)) | ||
| return evmcs_load(phys_addr); | ||
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| 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); | ||
| } | ||
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| 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; | ||
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| asm volatile (__ex("invvpid %2, %1") CC_SET(na) | ||
| : CC_OUT(na) (error) : "r"(ext), "m"(operand)); | ||
| BUG_ON(error); | ||
| } | ||
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| static inline void __invept(unsigned long ext, u64 eptp, gpa_t gpa) | ||
| { | ||
| struct { | ||
| u64 eptp, gpa; | ||
| } operand = {eptp, gpa}; | ||
| bool error; | ||
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| asm volatile (__ex("invept %2, %1") CC_SET(na) | ||
| : CC_OUT(na) (error) : "r"(ext), "m"(operand)); | ||
| BUG_ON(error); | ||
| } | ||
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| static inline bool vpid_sync_vcpu_addr(int vpid, gva_t addr) | ||
| { | ||
| if (vpid == 0) | ||
| return true; | ||
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| if (cpu_has_vmx_invvpid_individual_addr()) { | ||
| __invvpid(VMX_VPID_EXTENT_INDIVIDUAL_ADDR, vpid, addr); | ||
| return true; | ||
| } | ||
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| return false; | ||
| } | ||
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| static inline void vpid_sync_vcpu_single(int vpid) | ||
| { | ||
| if (vpid == 0) | ||
| return; | ||
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| if (cpu_has_vmx_invvpid_single()) | ||
| __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vpid, 0); | ||
| } | ||
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| static inline void vpid_sync_vcpu_global(void) | ||
| { | ||
| if (cpu_has_vmx_invvpid_global()) | ||
| __invvpid(VMX_VPID_EXTENT_ALL_CONTEXT, 0, 0); | ||
| } | ||
|
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| static inline void vpid_sync_context(int vpid) | ||
| { | ||
| if (cpu_has_vmx_invvpid_single()) | ||
| vpid_sync_vcpu_single(vpid); | ||
| else | ||
| vpid_sync_vcpu_global(); | ||
| } | ||
|
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| static inline void ept_sync_global(void) | ||
| { | ||
| __invept(VMX_EPT_EXTENT_GLOBAL, 0, 0); | ||
| } | ||
|
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| 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(); | ||
| } | ||
|
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| #endif /* __KVM_X86_VMX_INSN_H */ |
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