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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2013-05-13 15:29:11 -0400 |
|---|---|---|
| committer | Ian Campbell <ian.campbell@citrix.com> | 2013-05-14 10:01:50 +0100 |
| commit | bec8f17e48439ee5b8370f4e431ccd9a9514bee7 (patch) | |
| tree | 59b77ff052dcef3826e1f54a5eb183ae5ceac18a /tools/libxc | |
| parent | abf04cf04f5b6f2ce22e9f7966d63303b9487d81 (diff) | |
| download | xen-bec8f17e48439ee5b8370f4e431ccd9a9514bee7.tar.gz xen-bec8f17e48439ee5b8370f4e431ccd9a9514bee7.tar.bz2 xen-bec8f17e48439ee5b8370f4e431ccd9a9514bee7.zip | |
hypervisor/xen/tools: Remove the XENMEM_get_oustanding_pages and provide the data via xc_phys_info
During the review of the patches it was noticed that there exists
a race wherein the 'free_memory' value consists of information from
two hypercalls. That is the XEN_SYSCTL_physinfo and XENMEM_get_outstanding_pages.
The free memory the host has available for guest is the difference between
the 'free_pages' (from XEN_SYSCTL_physinfo) and 'outstanding_pages'. As they
are two hypercalls many things can happen in between the execution of them.
This patch resolves this by eliminating the XENMEM_get_outstanding_pages
hypercall and providing the free_pages and outstanding_pages information
via the xc_phys_info structure.
It also removes the XSM hooks and adds locking as needed.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Reviewed-by: Tim Deegan <tim@xen.org>
Acked-by: Keir Fraser <keir.xen@gmail.com>
Diffstat (limited to 'tools/libxc')
| -rw-r--r-- | tools/libxc/xc_domain.c | 9 | ||||
| -rw-r--r-- | tools/libxc/xenctrl.h | 2 |
2 files changed, 0 insertions, 11 deletions
diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c index bb71ccaecf..3257e2af94 100644 --- a/tools/libxc/xc_domain.c +++ b/tools/libxc/xc_domain.c @@ -873,15 +873,6 @@ int xc_domain_claim_pages(xc_interface *xch, err = errno = 0; return err; } -unsigned long xc_domain_get_outstanding_pages(xc_interface *xch) -{ - long ret = do_memory_op(xch, XENMEM_get_outstanding_pages, NULL, 0); - - /* Ignore it if the hypervisor does not support the call. */ - if (ret == -1 && errno == ENOSYS) - ret = errno = 0; - return ret; -} int xc_domain_populate_physmap(xc_interface *xch, uint32_t domid, diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h index c024af439b..40ee8fce2a 100644 --- a/tools/libxc/xenctrl.h +++ b/tools/libxc/xenctrl.h @@ -1182,8 +1182,6 @@ int xc_domain_claim_pages(xc_interface *xch, uint32_t domid, unsigned long nr_pages); -unsigned long xc_domain_get_outstanding_pages(xc_interface *xch); - int xc_domain_memory_exchange_pages(xc_interface *xch, int domid, unsigned long nr_in_extents, |