This patch is used to prepare exposing PCID/INVPCID features to hvm
guest.
The specific exposure result depend on hvm paging mode (hap/shadow),
which would be handled at next patch.
Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com>
Committed-by: Keir Fraser <keir@xen.org>
Pushing stuff onto the stack on x86-64 when we do not specify
-mno-red-zone is unsafe. Since the complicated asm is due to register
pressure on i386, we simply implement an all-new simpler alternative
for x86-64.
Signed-off-by: Keir Fraser <keir@xen.org>
Acked-by: Jan Beulich <jbeulich@novell.com>
It's not really any more useful than explicitly setting new M2P
entries to the invalid value.
Signed-off-by: Tim Deegan <tim@xen.org>
Committed-by: Keir Fraser <keir@xen.org>
The notify offset and event channels are both unsigned variables, so
testing for >= 0 will not correctly detect the use of -1 to indicate
the field is unused. Remove the useless comparison and replace with
correct range checks or comparisons to -1.
Reported-by: Anil Madhavapeddy <anil@recoil.org>
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
Instead of sending dirty pages of guest memory as-is, use a simple compression
algorithm that sends a RLE-encoded XOR of the page against its last sent copy.
A small LRU cache is used to hold recently dirtied pages. Pagetable pages are
sent as-is, as they are canonicalized at sender side and uncanonicalized at
receiver.
[ Fixed up a conflict in sg_save_restore.h. I had to increase the
ID values used from -11 and -12 to -12 and -13 because -11 had
been taken by ..._HVM_VIRIDIAN in the meantime. -iwj ]
Signed-off-by: Shriram Rajagopalan <rshriram@cs.ubc.ca>
Acked-by: Brendan Cully <brendan@cs.ubc.ca>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
Move (page aligned) buffer allocations in {os}_privcmd_alloc_hypercall_buffer
into a global function xc_memalign. This API is also used by Remus
compression code to allocate compression caches that need to be page aligned.
Signed-off-by: Shriram Rajagopalan <rshriram@cs.ubc.ca>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Brendan Cully <brendan@cs.ubc.ca>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
This is due to a stale check for guest_handle_null in the hypervisor,
which doesn't necessarily work with the hypercall buffers.
Signed-off-by: Andres Lagar-Cavilla <andres@lagarcavilla.org>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Committed-by: Tim Deegan <tim@xen.org>
xc_domain_save/restore currently pay no attention to
HVM_PARAM_VIRIDIAN which results in an HVM domain running a recent
version on Windows (post-Vista) locking up on a domain restore due to
EOIs (done via a viridian MSR write) being silently dropped. This
patch adds an extra save entry for the viridian parameter and also
adds code in the viridian kernel module to catch attempted use of
viridian functionality when the HVM parameter has not been set.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Committed-by: Keir Fraser <keir@xen.org>
Since hvmloader has a xentore client, use a platform key in xenstore
to indicate whether ACPI is enabled or not rather than the shared
hvm_info_table structure.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Committed-by: Keir Fraser <keir@xen.org>
The layouts were actually correct, but the type names were a bit
messed up.
Original patch by Volker Eckert <volker.eckert@citrix.com>
Signed-off-by: Keir Fraser <keir@xen.org>
Create two new variables called APPEND_ and PREPEND_ to add compile
flags at the beginning or at the end of the search path.
Added a new semantic for user defined compile flags, here is the list
of possible options:
PREPEND_LIB: add libraries to the search path before xen
(before xen installation folders).
PREPEND_INCLUDES: add headers to the search path before xen
(before xen installation folders).
APPEND_LIB: add libraries to the search path at the end
(after all xen installation folders have been added).
APPEND_INCLUDES: add libraries to the search path at the end
(after all xen installation folders have been added).
EXTRA_INCLUDES and EXTRA_LIB can still be used, and they will have the
same effect as PREPEND_INCLUDES and PREPEND_LIB.
Signed-off-by: Roger Pau Monne <roger.pau@entel.upc.edu>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
Provide pse36 cpuid bit if guest runs in 32bit PAE
or in long mode. Hyper-V refuses to start as
the "cpu does not provide required hw features"
if it does not find the pse36 cpuid bits.
Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>
Acked-by: Tim Deegan <tim@xen.org>
Committed-by: Tim Deegan <tim@xen.org>
Sandy bridge introduces new MSR to get cc7/pc2 residency (core C-state
7/package C-state 2). Print the cc7/pc2 residency when on sandy bridge
platform.
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Committed-by: Keir Fraser <keir@xen.org>
Backends were inconsistent about reporting and it's a pain to edit them all
when adding a new class of osdep.
Signed-off-by: Ian Campbell <Ian.campbell@citrix.com>
Acked-by: Ian Jackson <ian.jackson.citrix.com>
Committed-by: Ian Jackson <ian.jackson.citrix.com>
---
Requires Daniel De Graaf's "libxc: add xc_gntshr_* functions"
These functions and the xc_gntshr device (/dev/xen/gntalloc on linux)
allow applications to create pages shared with other domains.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
Normally, when a userspace process mapping a grant crashes, the domain
providing the reference receives no indication that its peer has
crashed, possibly leading to unexpected freezes or timeouts. This
function provides a notification of the unmap by signalling an event
channel and/or clearing a specific byte in the page.
This also unifies the 3 very similar grant-mapping osdep interfaces into
a single function instead of introducing yet another minor variation.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
The toolstack should know how many pages are paged-out at a given point
in time so it could make smarter decisions about how many pages should
be paged or ballooned.
Add a new member to xen_domctl_getdomaininfo and bump interface version.
Use the new member in xc_dominfo_t.
The SONAME of libxc should be changed if this patch gets applied.
Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Tim Deegan <tim@xen.org>
Committed-by: Tim Deegan <tim@xen.org>
Up to now a single ring buffer was used for mem_share, xenpaging and
xen-access. Each helper would have to cooperate and pull only its own
requests from the ring. Unfortunately this was not implemented. And
even if it was, it would make the whole concept fragile because a crash
or early exit of one helper would stall the others.
What happend up to now is that active xenpaging + memory_sharing would
push memsharing requests in the buffer. xenpaging is not prepared for
such requests.
This patch creates an independet ring buffer for mem_share, xenpaging
and xen-access and adds also new functions to enable xenpaging and
xen-access. The xc_mem_event_enable/xc_mem_event_disable functions will
be removed. The various XEN_DOMCTL_MEM_EVENT_* macros were cleaned up.
Due to the removal the API changed, so the SONAME will be changed too.
Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Tim Deegan <tim@xen.org>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Committed-by: Tim Deegan <tim@xen.org>
In HVM domains the usable performance counters can be checked
automatically only, if cpuid leaf 0x0000000a is accessible.
Signed-off-by: Juergen Gross <juergen.gross@ts.fujitsu.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
With our switching away from supporting 32-bit Dom0 operation, users
complained that attempts (perhaps due to lack of knowledge of that
change) to boot the no longer privileged kernel in Dom0 resulted in
apparently silent failure. To make the mismatch explicit and visible,
add dom0 feature flag that the kernel can set to indicate operation as
dom0 is supported.
Due to the way elf_xen_parse_features() worked up to now (getting
fixed here), adding features indications to the old, string based ELF
note would make the respective kernel unusable on older hypervisors.
For that reason, a new ELF Note is being introduced that allows
specifying supported features as a bit array instead (with features
unknown to the hypervisor simply ignored, as now also done by
elf_xen_parse_features(), whereas here unknown kernel-required
features still keep the kernel [and hence VM] from booting).
Introduce and use elf_note_numeric_array() to be forward
compatible (or else an old hypervisor wouldn't be able to parse kernel
specified features occupying more than 64 bits - thanks, Ian!).
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Support TSC Rate MSR and enable TSC scaling for
nested virtualization.
With it, guest VMs don't need take #VMEXIT to calculate a translated
TSC value when it is running under TSC emulation mode.
I measured native performance of the rdtsc instruction
in the l2 guest with xen-on-xen and both host and
and l1 guest run under TSC emulation mode.
TSC scaling just needs MSR emulation and correct tsc offset
calculation to be done and thus can be emulated also on older
hardware. In this case rdtsc instruction is intercepted and
handled by the host directly and safes the cost of a full
VMRUN/VMEXIT emulation cycle.
Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>
The result of a CPUID Extended Topology Enumeration leaf for PV guests
is invalid as the level in ECX is ignored. This can cause some guests
to loop endlessly when trying to enumerate the topology.
Since the physical topology isn't useful to PV guests set the topology
leaf as unsupported.
Guests affected include Linux kernels prior 2.6.32 where a workaround
was applied ("xen: mask extended topology info in cpu",
82d6469916c6fcfa345636a49004c9d1753905d1).
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
With our switching away from supporting 32-bit Dom0 operation, users
complained that attempts (perhaps due to lack of knowledge of that
change) to boot the no longer privileged kernel in Dom0 resulted in
apparently silent failure. To make the mismatch explicit and visible,
add feature flags that the kernel can set to indicate operation in
what modes it supports. For backward compatibility, absence of both
feature flags is taken to indicate a kernel that may be capable of
operating in both modes.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
.. as there is no need to keep that internal header file anymore.
We export two functions xc_domain_[set|get]_memory_map which
depend on the 'struct e820entry' defined in 'xc_e820.h'.
We move the contents of the 'xc_e820.h' to the 'xenctrl.h' fixing
compiler errors when applications outside the Xen tree are trying
to compile against the libraries.
Tested-by: Daniel Castro <evil.dani@gmail.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
Bitmaps are used in save/restore, xenpaging and blktap2. Merge the code into a
private xc_bitops.h file. All users are single threaded, so locking is not an
issue. The array of bits is handled as volatile because the x86 save/restore
code passes the bitmap to the hypervisor which in turn modifies the bitmap.
blktap2 uses a private bitmap. There was a possible overflow in the
bitmap_size() function, the remainder was not considered.
ia64 save/restore uses a bitmap to send the number of vcpus to the host.
x86 save/restore uses a bitmap to track dirty pages. This bitmap is shared with
the hypervisor. An unused function count_bits() was removed and a new
bitmap_size() function is now used.
xenpaging uses 3 private bitmaps to track the gfns which are in paged-out
state. It had a copy of some Linux bitops.h, which is now obsolete. Also the
BITS_PER_LONG macro was hardcoded to 64 which made it impossible to run 32bit
tools on a 64bit host. Wether this works at all has to be tested, yet.
Signed-off-by: Olaf Hering <olaf@aepfle.de>
Committed-by: Ian Jackson <ian.jackson.citrix.com>
Write/read FS/GS base instructions enable user level code to
read/write FS & GS segment base registers for thread local storage.
Signed-off-by: Yang, Wei <wei.y.yang@intel.com>
This patch exposes ERMS feature to HVM and PV guests.
The REP MOVSB/STOSB instruction can enhance fast strings attempts to
move as much of the data with larger size load/stores as possible.
Signed-off-by: Yang, Wei <wei.y.yang@intel.com>
This patch exposes DRNG feature to HVM guests.
The RDRAND instruction can provide software with sequences of
random numbers generated from white noise.
Signed-off-by: Yang, Wei <wei.y.yang@intel.com>
Intel new CPU supports SMEP (Supervisor Mode Execution Protection). SMEP
prevents software operating with CPL < 3 (supervisor mode) from fetching
instructions from any linear address with a valid translation for which the U/S
flag (bit 2) is 1 in every paging-structure entry controlling the translation
for the linear address.
This patch adds SMEP support to HVM guest.
Signed-off-by: Yang Wei <wei.y.yang@intel.com>
Signed-off-by: Shan Haitao <haitao.shan@intel.com>
Signed-off-by: Li Xin <xin.li@intel.com>
Signed-off-by: Tim Deegan <Tim.Deegan@citrix.com>
* Remove Linux-private defns with no direct relation to CPUID
* Remove word offsets into Linux-defined cpu_caps array
* Hard tabs -> soft tabs
Signed-off-by: Keir Fraser <keir@xen.org>
To detect presence of superpages on the receiver side, we need
to have strings of sequential pfns sent across on the first iteration
through the memory. However, as we go through the memory, more and
more of it will be marked dirty, making it wasteful to send those pages.
This patch introduces a new PFINFO type, "XALLOC". Like PFINFO_XTAB, it
indicates that there is no corresponding page present in the subsquent
page buffer. However, unlike PFINFO_XTAB, it contains a pfn which should be
allocated.
This new type is only used for migration; but it's placed in
xen/public/domctl.h so that the value isn't reused.
Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>
Committed-by: Ian Jackson <ian.jackson.citrix.com>
On the first time through (when pfns are mostly allocated on
the receiving side), try to keep superpages together in the same
batch by ending a batch early if we see the first page of a
potential superpage and there isn't enough room in the batch
for a full superpage.
Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>
Committed-by: Ian Jackson <ian.jackson.citrix.com>
When receiving pages, look for contiguous 2-meg aligned regions and
attempt to allocate a superpage for that region, falling back to
4k pages if the allocation fails.
(Minor conflict fixed up. -iwj)
Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
Add these two functions.
The later retrieves the E820 as seen by the hypervisor (completely
unchanged) and the second call sets the E820 for the specified guest.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
Liu, Jinsong
Keir Fraser
Tim Deegan
Daniel De Graaf
Andres Lagar-Cavilla
Shriram Rajagopalan
Paul Durrant
Olaf Hering
Roger Pau Monne
Yang Zhang
Ian Campbell
Olaf Hering
Jan Beulich
Juergen Gross
Jan Beulich
Christoph Egger
David Vrabel
Konrad Rzeszutek Wilk
Yang, Wei
Tim Deegan
George Dunlap
Wei Liu