370 lines
10 KiB
C
370 lines
10 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __KVM_X86_VMX_INSN_H
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#define __KVM_X86_VMX_INSN_H
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#include <linux/nospec.h>
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#include <asm/vmx.h>
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#include "hyperv.h"
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#include "vmcs.h"
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#include "../x86.h"
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void vmread_error(unsigned long field);
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void vmwrite_error(unsigned long field, unsigned long value);
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void vmclear_error(struct vmcs *vmcs, u64 phys_addr);
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void vmptrld_error(struct vmcs *vmcs, u64 phys_addr);
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void invvpid_error(unsigned long ext, u16 vpid, gva_t gva);
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void invept_error(unsigned long ext, u64 eptp, gpa_t gpa);
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#ifndef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
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/*
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* The VMREAD error trampoline _always_ uses the stack to pass parameters, even
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* for 64-bit targets. Preserving all registers allows the VMREAD inline asm
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* blob to avoid clobbering GPRs, which in turn allows the compiler to better
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* optimize sequences of VMREADs.
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*
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* Declare the trampoline as an opaque label as it's not safe to call from C
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* code; there is no way to tell the compiler to pass params on the stack for
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* 64-bit targets.
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*
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* void vmread_error_trampoline(unsigned long field, bool fault);
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*/
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extern unsigned long vmread_error_trampoline;
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/*
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* The second VMREAD error trampoline, called from the assembly trampoline,
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* exists primarily to enable instrumentation for the VM-Fail path.
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*/
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void vmread_error_trampoline2(unsigned long field, bool fault);
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#endif
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static __always_inline void vmcs_check16(unsigned long field)
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{
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000,
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"16-bit accessor invalid for 64-bit field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
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"16-bit accessor invalid for 64-bit high field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
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"16-bit accessor invalid for 32-bit high field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
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"16-bit accessor invalid for natural width field");
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}
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static __always_inline void vmcs_check32(unsigned long field)
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{
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
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"32-bit accessor invalid for 16-bit field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000,
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"32-bit accessor invalid for 64-bit field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
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"32-bit accessor invalid for 64-bit high field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
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"32-bit accessor invalid for natural width field");
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}
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static __always_inline void vmcs_check64(unsigned long field)
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{
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
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"64-bit accessor invalid for 16-bit field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
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"64-bit accessor invalid for 64-bit high field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
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"64-bit accessor invalid for 32-bit field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
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"64-bit accessor invalid for natural width field");
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}
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static __always_inline void vmcs_checkl(unsigned long field)
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{
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
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"Natural width accessor invalid for 16-bit field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000,
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"Natural width accessor invalid for 64-bit field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
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"Natural width accessor invalid for 64-bit high field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
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"Natural width accessor invalid for 32-bit field");
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}
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static __always_inline unsigned long __vmcs_readl(unsigned long field)
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{
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unsigned long value;
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#ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
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asm_volatile_goto("1: vmread %[field], %[output]\n\t"
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"jna %l[do_fail]\n\t"
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_ASM_EXTABLE(1b, %l[do_exception])
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: [output] "=r" (value)
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: [field] "r" (field)
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: "cc"
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: do_fail, do_exception);
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return value;
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do_fail:
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instrumentation_begin();
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vmread_error(field);
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instrumentation_end();
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return 0;
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do_exception:
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kvm_spurious_fault();
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return 0;
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#else /* !CONFIG_CC_HAS_ASM_GOTO_OUTPUT */
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asm volatile("1: vmread %2, %1\n\t"
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".byte 0x3e\n\t" /* branch taken hint */
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"ja 3f\n\t"
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/*
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* VMREAD failed. Push '0' for @fault, push the failing
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* @field, and bounce through the trampoline to preserve
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* volatile registers.
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*/
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"xorl %k1, %k1\n\t"
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"2:\n\t"
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"push %1\n\t"
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"push %2\n\t"
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"call vmread_error_trampoline\n\t"
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/*
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* Unwind the stack. Note, the trampoline zeros out the
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* memory for @fault so that the result is '0' on error.
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*/
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"pop %2\n\t"
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"pop %1\n\t"
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"3:\n\t"
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/* VMREAD faulted. As above, except push '1' for @fault. */
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_ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_ONE_REG, %1)
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: ASM_CALL_CONSTRAINT, "=&r"(value) : "r"(field) : "cc");
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return value;
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#endif /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT */
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}
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static __always_inline u16 vmcs_read16(unsigned long field)
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{
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vmcs_check16(field);
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if (kvm_is_using_evmcs())
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return evmcs_read16(field);
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return __vmcs_readl(field);
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}
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static __always_inline u32 vmcs_read32(unsigned long field)
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{
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vmcs_check32(field);
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if (kvm_is_using_evmcs())
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return evmcs_read32(field);
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return __vmcs_readl(field);
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}
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static __always_inline u64 vmcs_read64(unsigned long field)
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{
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vmcs_check64(field);
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if (kvm_is_using_evmcs())
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return evmcs_read64(field);
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#ifdef CONFIG_X86_64
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return __vmcs_readl(field);
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#else
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return __vmcs_readl(field) | ((u64)__vmcs_readl(field+1) << 32);
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#endif
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}
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static __always_inline unsigned long vmcs_readl(unsigned long field)
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{
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vmcs_checkl(field);
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if (kvm_is_using_evmcs())
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return evmcs_read64(field);
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return __vmcs_readl(field);
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}
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#define vmx_asm1(insn, op1, error_args...) \
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do { \
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asm_volatile_goto("1: " __stringify(insn) " %0\n\t" \
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".byte 0x2e\n\t" /* branch not taken hint */ \
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"jna %l[error]\n\t" \
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_ASM_EXTABLE(1b, %l[fault]) \
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: : op1 : "cc" : error, fault); \
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return; \
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error: \
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instrumentation_begin(); \
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insn##_error(error_args); \
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instrumentation_end(); \
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return; \
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fault: \
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kvm_spurious_fault(); \
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} while (0)
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#define vmx_asm2(insn, op1, op2, error_args...) \
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do { \
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asm_volatile_goto("1: " __stringify(insn) " %1, %0\n\t" \
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".byte 0x2e\n\t" /* branch not taken hint */ \
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"jna %l[error]\n\t" \
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_ASM_EXTABLE(1b, %l[fault]) \
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: : op1, op2 : "cc" : error, fault); \
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return; \
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error: \
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instrumentation_begin(); \
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insn##_error(error_args); \
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instrumentation_end(); \
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return; \
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fault: \
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kvm_spurious_fault(); \
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} while (0)
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static __always_inline void __vmcs_writel(unsigned long field, unsigned long value)
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{
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vmx_asm2(vmwrite, "r"(field), "rm"(value), field, value);
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}
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static __always_inline void vmcs_write16(unsigned long field, u16 value)
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{
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vmcs_check16(field);
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if (kvm_is_using_evmcs())
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return evmcs_write16(field, value);
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__vmcs_writel(field, value);
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}
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static __always_inline void vmcs_write32(unsigned long field, u32 value)
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{
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vmcs_check32(field);
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if (kvm_is_using_evmcs())
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return evmcs_write32(field, value);
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__vmcs_writel(field, value);
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}
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static __always_inline void vmcs_write64(unsigned long field, u64 value)
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{
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vmcs_check64(field);
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if (kvm_is_using_evmcs())
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return evmcs_write64(field, value);
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__vmcs_writel(field, value);
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#ifndef CONFIG_X86_64
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__vmcs_writel(field+1, value >> 32);
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#endif
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}
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static __always_inline void vmcs_writel(unsigned long field, unsigned long value)
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{
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vmcs_checkl(field);
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if (kvm_is_using_evmcs())
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return evmcs_write64(field, value);
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__vmcs_writel(field, value);
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}
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static __always_inline void vmcs_clear_bits(unsigned long field, u32 mask)
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{
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000,
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"vmcs_clear_bits does not support 64-bit fields");
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if (kvm_is_using_evmcs())
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return evmcs_write32(field, evmcs_read32(field) & ~mask);
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__vmcs_writel(field, __vmcs_readl(field) & ~mask);
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}
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static __always_inline void vmcs_set_bits(unsigned long field, u32 mask)
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{
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000,
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"vmcs_set_bits does not support 64-bit fields");
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if (kvm_is_using_evmcs())
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return evmcs_write32(field, evmcs_read32(field) | mask);
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__vmcs_writel(field, __vmcs_readl(field) | mask);
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}
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static inline void vmcs_clear(struct vmcs *vmcs)
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{
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u64 phys_addr = __pa(vmcs);
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vmx_asm1(vmclear, "m"(phys_addr), vmcs, phys_addr);
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}
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static inline void vmcs_load(struct vmcs *vmcs)
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{
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u64 phys_addr = __pa(vmcs);
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if (kvm_is_using_evmcs())
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return evmcs_load(phys_addr);
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vmx_asm1(vmptrld, "m"(phys_addr), vmcs, phys_addr);
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}
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static inline void __invvpid(unsigned long ext, u16 vpid, gva_t gva)
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{
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struct {
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u64 vpid : 16;
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u64 rsvd : 48;
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u64 gva;
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} operand = { vpid, 0, gva };
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vmx_asm2(invvpid, "r"(ext), "m"(operand), ext, vpid, gva);
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}
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static inline void __invept(unsigned long ext, u64 eptp, gpa_t gpa)
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{
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struct {
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u64 eptp, gpa;
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} operand = {eptp, gpa};
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vmx_asm2(invept, "r"(ext), "m"(operand), ext, eptp, gpa);
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}
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static inline void vpid_sync_vcpu_single(int vpid)
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{
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if (vpid == 0)
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return;
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__invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vpid, 0);
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}
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static inline void vpid_sync_vcpu_global(void)
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{
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__invvpid(VMX_VPID_EXTENT_ALL_CONTEXT, 0, 0);
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}
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static inline void vpid_sync_context(int vpid)
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{
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if (cpu_has_vmx_invvpid_single())
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vpid_sync_vcpu_single(vpid);
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else if (vpid != 0)
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vpid_sync_vcpu_global();
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}
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static inline void vpid_sync_vcpu_addr(int vpid, gva_t addr)
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{
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if (vpid == 0)
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return;
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if (cpu_has_vmx_invvpid_individual_addr())
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__invvpid(VMX_VPID_EXTENT_INDIVIDUAL_ADDR, vpid, addr);
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else
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vpid_sync_context(vpid);
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}
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static inline void ept_sync_global(void)
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{
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__invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
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}
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static inline void ept_sync_context(u64 eptp)
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{
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if (cpu_has_vmx_invept_context())
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__invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
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else
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ept_sync_global();
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}
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#endif /* __KVM_X86_VMX_INSN_H */
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