[lkml]   [2019]   [Oct]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] selftests: kvm: fix sync_regs_test with newer gccs
On 09/10/19 12:42, Vitaly Kuznetsov wrote:
> Paolo Bonzini <> writes:
>> There is no practical difference with Vitaly's patch. The first
>> _vcpu_run has no pre-/post-conditions on the value of %rbx:
> I think what Sean was suggesting is to prevent GCC from inserting
> anything (and thus clobbering RBX) between the call to guest_call() and
> the beginning of 'asm volatile' block by calling *inside* 'asm volatile'
> block instead.

Yes, but there is no way that clobbering RBX will break the test,
because RBX is not initialized until after the first _vcpu_run succeeds.


 \ /
  Last update: 2019-10-09 13:12    [W:0.032 / U:19.444 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site