diff options
Diffstat (limited to 'arch/x86/kvm/vmx/vmenter.S')
| -rw-r--r-- | arch/x86/kvm/vmx/vmenter.S | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx/vmenter.S b/arch/x86/kvm/vmx/vmenter.S index ca2065166d1d..9651ba388ba9 100644 --- a/arch/x86/kvm/vmx/vmenter.S +++ b/arch/x86/kvm/vmx/vmenter.S @@ -234,3 +234,61 @@ SYM_FUNC_START(__vmx_vcpu_run) 2: mov $1, %eax jmp 1b SYM_FUNC_END(__vmx_vcpu_run) + +/** + * vmread_error_trampoline - Trampoline from inline asm to vmread_error() + * @field: VMCS field encoding that failed + * @fault: %true if the VMREAD faulted, %false if it failed + + * Save and restore volatile registers across a call to vmread_error(). Note, + * all parameters are passed on the stack. + */ +SYM_FUNC_START(vmread_error_trampoline) + push %_ASM_BP + mov %_ASM_SP, %_ASM_BP + + push %_ASM_AX + push %_ASM_CX + push %_ASM_DX +#ifdef CONFIG_X86_64 + push %rdi + push %rsi + push %r8 + push %r9 + push %r10 + push %r11 +#endif +#ifdef CONFIG_X86_64 + /* Load @field and @fault to arg1 and arg2 respectively. */ + mov 3*WORD_SIZE(%rbp), %_ASM_ARG2 + mov 2*WORD_SIZE(%rbp), %_ASM_ARG1 +#else + /* Parameters are passed on the stack for 32-bit (see asmlinkage). */ + push 3*WORD_SIZE(%ebp) + push 2*WORD_SIZE(%ebp) +#endif + + call vmread_error + +#ifndef CONFIG_X86_64 + add $8, %esp +#endif + + /* Zero out @fault, which will be popped into the result register. */ + _ASM_MOV $0, 3*WORD_SIZE(%_ASM_BP) + +#ifdef CONFIG_X86_64 + pop %r11 + pop %r10 + pop %r9 + pop %r8 + pop %rsi + pop %rdi +#endif + pop %_ASM_DX + pop %_ASM_CX + pop %_ASM_AX + pop %_ASM_BP + + ret +SYM_FUNC_END(vmread_error_trampoline) |