need for a hypercall in the guest timer interrupt handler.
Cleaned up stolen/blocked tick handling in Linux.
Signed-off-by: Keir Fraser <keir@xensource.com>
exported by Xen. This is based heavily on a patch from Rik van Riel, but
extended to distinguish between idle/blocked cycles and stolen cycles.
There is still stuff todo:
1. Xen should export the time values in shared memory, to save a hypercall
on every time interrupt (even though that is only every 10ms, worst case).
2. As in s390, Xen's cputime_t should be measured at finer granularity than
jiffies. Nanoseconds would be a better unit.
3. Break out the internals of the account_steal_time() interface so that we don't
need to abuse it so wretchedly.
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Keir Fraser <keir@xensource.com>
uses slow iret path every time (but most returns will do that
anyway, since they'll be to userspace). Fast return (to kernel)
can be implemented inside the macro and respect the
supervisor_mode_kernel feature flag.
Signed-off-by: Keir Fraser <keir@xensource.com>
Add comments in public header version.h to explain what all the different
feature flags mean. Add a new flag XENFEAT_pae_pgdir_above_4gb to inform the guest
that its PAE page directories do not need to conform to the usual hardware
restriction.
Signed-off-by: Keir Fraser <keir@xensource.com>
in auto_translated_physmap mode. A new comment in that function explains
why this is an okay thing to do.
This avoids an unnecessary crash in Xen's skbuff_ctor.
Signed-off-by: Michael Vrable <mvrable@cs.ucsd.edu>
Signed-off-by: Keir Fraser <keir@xensource.com>
To support this we give kernel GDT entries DPL=0 and use kernel
segment selectors with RPL=0. Xen will crunch these to ring 1 when
they are passed in. When a segment selector is used directly or placed
in a stack frame the guest OS is reponsible for crunching the RPL.
Signed-off-by: Ian Campbell <Ian.Campbell@XenSource.com>
Fix a recently found problem in tpm.c, move the vtpm sysfs
entry to /sys/device/platform/tpm_vtpm and add locking in
the vtpm hotplug script.
Signed-off-by: Stefan Berger <stefanb@us.ibm.com>
As a consequence, some of the i386 changes over native code need to also be
added to x86-64.
From: Jan Beulich <JBeulich@novell.com>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
Add CONFIG_X86_NO_IDT to exclude all code which references the idt table.
Also fix the non-Xen cpu_gdt_init() handling.
From: Jan Beulich <JBeulich@novell.com>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
Add CONFIG_X86_NO_IDT to exclude all code which references the idt table.
Make CONFIG_X86_F00F_BUG conditional on CONFIG_X86_NO_IDT.
From: Jan Beulich <JBeulich@novell.com>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
to avoid problems when the position of the hypercall page changes.
Further, clean up many things to avoid needless differences to native
code, while also adding a couple of adjustments that only will be
submitted for native code inclusion, that simplify code, or that
remove unused elements.
From: Jan Beulich <JBeulich@novell.com>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
to allow the new VMSPLIT_* Kconfig options to work, and to
avoid problems when the position of the hypercall page
changes.
From: Jan Beulich <JBeulich@novell.com>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
and consumes 25% of the per-cpu area.
Add CONFIG_X86_NO_TSS to exclude all code which references tss.
Based on a patch by Jan Beulich <JBeulich@novell.com>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
and consumes 25% of the per-cpu area.
Add CONFIG_X86_NO_TSS to exclude all code which references tss.
Add CONFIG_X86_SYSENTER to conditionally include support for sysenter.
Change CONFIG_DOUBLEFAULT to depend on !CONFIG_X86_NO_TSS.
(sysenter and doublefault need tss).
Based on a patch by Jan Beulich <JBeulich@novell.com>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
