in the function do_vmx_vcpu_run , there are some code which i didn't understand. question one: ".Lkvm_vmx_return: " /* Save guest registers, load host registers, keep flags */ "xchg %0, (%%"R"sp) \n\t" "mov %%"R"ax, %c[rax](%0) \n\t" "mov %%"R"bx, %c[rbx](%0) \n\t" "push"Q" (%%"R"sp); pop"Q" %c[rcx](%0) \n\t" "mov %%"R"dx, %c[rdx](%0) \n\t" "mov %%"R"si, %c[rsi](%0) \n\t" "mov %%"R"di, %c[rdi](%0) \n\t" "mov %%"R"bp, %c[rbp](%0) \n\t" why need "xchg %0, (%%"R"sp) \n\t" and "push"Q" (%%"R"sp); pop"Q" %c[rcx](%0) \n\t" I think rsp will restore when vm exits, why we change it? question two: before vm entry /* Store host registers */ "push %%"R"dx; push %%"R"bp;" "push %%"R"cx \n\t" and after vm exit "pop %%"R"bp; pop %%"R"bp; pop %%"R"dx \n\t" why we need push rdx,rbp,rcx, and didn't pop rcx; and why we didn't save other register? -------------- jemmy858585 2010-10-31 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
