[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 2/4] libxc/xc_domain_resume: Update comment.
To hopefully clarify what it meant. Also point out that mechanism by which the return 1 value is done is via an intimate knowledge of the hypercall ABI (i.e. which register - eax - is the return value). Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> --- tools/libxc/xc_resume.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/tools/libxc/xc_resume.c b/tools/libxc/xc_resume.c index 87d4324..e692b81 100644 --- a/tools/libxc/xc_resume.c +++ b/tools/libxc/xc_resume.c @@ -248,11 +248,20 @@ out: /* * Resume execution of a domain after suspend shutdown. * This can happen in one of two ways: - * 1. Resume with special return code. - * 2. Reset guest environment so it believes it is resumed in a new - * domain context. + * 1. (fast=1) Resume the guest without resetting the domain environment. + * The guests's call to SCHEDOP_shutdown(SHUTDOWN_suspend) will return 1. + * + * 2. (fast=0) Reset guest environment so it believes it is resumed in a new + * domain context. The guests's call to SCHEDOP_shutdown(SHUTDOWN_suspend) + * will return 0. + * + * (1) should only by used for guests which can handle the special return + * code. Also note that the insertion of the return code is quite interesting + * and that the guest MUST be paused - otherwise we would be corrupting + * the guest vCPU state. + * * (2) should be used only for guests which cannot handle the special - * new return code. (1) is always safe (but slower). + * new return code - and it is always safe (but slower). */ int xc_domain_resume(xc_interface *xch, uint32_t domid, int fast) { -- 2.1.0 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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