search for: ia32_ef

To avoid MSR save/restore at every VM exit/entry time, we restore the x86_64 specific MSRs at domain switch time if modified. In VMX domains, we modify those upon requests from the guests to that end. Note that IA32_EFER.LME and IA32_EFER.LMA are saved/restored by H/W on every VM exit. For the usual domains (i.e. dom0 and domU), those MSRs are not modified once set at initialization time, so we don''t save them when swiched out, but simply reset them (if modified) to the initial values when switched in. T...

...on */ + lea (pm_code - base_address)(%rsi, 1), %rax + mov %eax, (jmp_address - base_address)(%rsi, 1) + + ljmp *(jmp_address - base_address)(%rsi, 1) + +jmp_address: + .long 0 /* address */ + .word 0x10 /* segment */ .code32 pm_code: - /* Disable IA-32e mode by clearing IA32_EFER.LME */ - xorl %eax, %eax - xorl %edx, %edx - movl $MSR_EFER, %ecx - wrmsr + /* cs segment has been updated, now update the rest */ + mov $0x18, %eax + mov %eax, %ds + mov %eax, %es + mov %eax, %fs + mov %eax, %gs + mov %eax, %ss - /* Turn off paging t...

...in jmp_address location */ + lea (pm_code - base_address)(%rsi, 1), %rax + mov %eax, (jmp_address - base_address)(%rsi, 1) + + ljmp *(jmp_address - base_address)(%rsi, 1) + +jmp_address: + .long 0 /* address */ + .word 0x10 /* segment */ .code32 pm_code: - /* Disable IA-32e mode by clearing IA32_EFER.LME */ - xorl %eax, %eax - xorl %edx, %edx - movl $MSR_EFER, %ecx - wrmsr + /* cs segment has been updated, now update the rest */ + mov $0x18, %eax + mov %eax, %ds + mov %eax, %es + mov %eax, %fs + mov %eax, %gs + mov %eax, %ss - /* Turn off paging to disable long mode */ - movl %cr0, %eax - an...