- 23 Apr, 2014 1 commit
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Nadav Amit authored
If a guest enables a performance counter but does not enable PMI, the hypervisor currently does not reprogram the performance counter once it overflows. As a result the host performance counter is kept with the original sampling period which was configured according to the value of the guest's counter when the counter was enabled. Such behaviour can cause very bad consequences. The most distrubing one can cause the guest not to make any progress at all, and keep exiting due to host PMI before any guest instructions is exeucted. This situation occurs when the performance counter holds a very high value when the guest enables the performance counter. As a result the host's sampling period is configured to be very short. The host then never reconfigures the sampling period and get stuck at entry->PMI->exit loop. We encountered such a scenario in our experiments. The solution is to reprogram the counter even if the guest does not use PMI. Signed-off-by:
Nadav Amit <namit@cs.technion.ac.il> Signed-off-by:
Marcelo Tosatti <mtosatti@redhat.com>
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- 22 Apr, 2014 39 commits
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Bandan Das authored
Some Type 1 hypervisors such as XEN won't enable VMX without it present Signed-off-by:
Bandan Das <bsd@redhat.com> Signed-off-by:
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Bandan Das authored
This feature emulates the "Acknowledge interrupt on exit" behavior. We can safely emulate it for L1 to run L2 even if L0 itself has it disabled (to run L1). Signed-off-by:
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Bandan Das authored
For single context invalidation, we fall through to global invalidation in handle_invept() except for one case - when the operand supplied by L1 is different from what we have in vmcs12. However, typically hypervisors will only call invept for the currently loaded eptp, so the condition will never be true. Signed-off-by:
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Huw Davies authored
When entering an exception after an ICEBP, the saved instruction pointer should point to after the instruction. This fixes the bug here: https://bugs.launchpad.net/qemu/+bug/1119686Signed-off-by:
Huw Davies <huw@codeweavers.com> Reviewed-by:
Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by:
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Marcelo Tosatti authored
Merge tag 'kvm-s390-20140422' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into queue Lazy storage key handling ------------------------- Linux does not use the ACC and F bits of the storage key. Newer Linux versions also do not use the storage keys for dirty and reference tracking. We can optimize the guest handling for those guests for faults as well as page-in and page-out by simply not caring about the guest visible storage key. We trap guest storage key instruction to enable those keys only on demand. Migration bitmap Until now s390 never provided a proper dirty bitmap. Let's provide a proper migration bitmap for s390. We also change the user dirty tracking to a fault based mechanism. This makes the host completely independent from the storage keys. Long term this will allow us to back guest memory with large pages. per-VM device attributes ------------------------ To avoid the introduction of new ioctls, let's provide the attribute semanantic also on the VM-"device". Userspace controlled CMMA ------------------------- The CMMA assist is changed from "always on" to "on if requested" via per-VM device attributes. In addition a callback to reset all usage states is provided. Proper guest DAT handling for intercepts ---------------------------------------- While instructions handled by SIE take care of all addressing aspects, KVM/s390 currently does not care about guest address translation of intercepts. This worked out fine, because - the s390 Linux kernel has a 1:1 mapping between kernel virtual<->real for all pages up to memory size - intercepts happen only for a small amount of cases - all of these intercepts happen to be in the kernel text for current distros Of course we need to be better for other intercepts, kernel modules etc. We provide the infrastructure and rework all in-kernel intercepts to work on logical addresses (paging etc) instead of real ones. The code has been running internally for several months now, so it is time for going public. GDB support ----------- We provide breakpoints, single stepping and watchpoints. Fixes/Cleanups -------------- - Improve program check delivery - Factor out the handling of transactional memory on program checks - Use the existing define __LC_PGM_TDB - Several cleanups in the lowcore structure - Documentation NOTES ----- - All patches touching base s390 are either ACKed or written by the s390 maintainers - One base KVM patch "KVM: add kvm_is_error_gpa() helper" - One patch introduces the notion of VM device attributes Signed-off-by:
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Michael Mueller authored
Factor out the new function handle_itdb(), which copies the ITDB into guest lowcore to fully handle a TX abort. Signed-off-by:
Michael Mueller <mimu@linux.vnet.ibm.com> Acked-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
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Michael Mueller authored
The generically assembled low core labels already contain the address for the TDB. Signed-off-by:
Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by:
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Christian Borntraeger authored
On hard exits (abort, sigkill) we have have some kvm_s390_interrupt_info structures hanging around. Delete those on exit to avoid memory leaks. Signed-off-by:
Thomas Huth <thuth@linux.vnet.ibm.com>
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David Hildenbrand authored
When a guest is single-stepped, we want to disable timer interrupts. Otherwise, the guest will continuously execute the external interrupt handler and make debugging of code where timer interrupts are enabled almost impossible. The delivery of timer interrupts can be enforced in such sections by setting a breakpoint and continuing execution. In order to disable timer interrupts, they are disabled in the control register of the guest just before SIE entry and are suppressed in the interrupt check/delivery methods. Signed-off-by:
David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by:
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David Hildenbrand authored
This patch moves the checks for enabled timer (clock-comparator) interrupts and pending timer interrupts into own functions, making the code better readable and easier to maintain. The method kvm_cpu_has_pending_timer is filled with life. Signed-off-by:
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David Hildenbrand authored
Added documentation for diag 501, stating that no subfunctions are provided and no parameters are used. Signed-off-by:
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David Hildenbrand authored
This patch adds support to debug the guest using the PER facility on s390. Single-stepping, hardware breakpoints and hardware watchpoints are supported. In order to use the PER facility of the guest without it noticing it, the control registers of the guest have to be patched and access to them has to be intercepted(stctl, stctg, lctl, lctlg). All PER program interrupts have to be intercepted and only the relevant PER interrupts for the guest have to be given back. Special care has to be taken about repeated exits on the same hardware breakpoint. The intervention of the host in the guests PER configuration is not fully transparent. PER instruction nullification can not be used by the guest and too many storage alteration events may be reported to the guest (if it is activated for special address ranges only) when the host concurrently debugging it. Signed-off-by:
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David Hildenbrand authored
This patch adds the structs to the kernel headers needed to pass information from/to userspace in order to debug a guest on s390 with hardware support. Signed-off-by:
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David Hildenbrand authored
Introduce the methods to emulate the stctl and stctg instruction. Added tracing code. Signed-off-by:
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David Hildenbrand authored
When a program interrupt was to be delivered until now, no program interrupt parameters were stored in the low-core of the target vcpu. This patch enables the delivery of those program interrupt parameters, takes care of concurrent PER events which can be injected in addition to any program interrupt and uses the correct instruction length code (depending on the interception code) for the injection of program interrupts. Signed-off-by:
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David Hildenbrand authored
Whenever a program interrupt is intercepted, some parameters are stored in the sie control block. These parameters have to be extracted in order to be reinjected correctly. This patch also takes care of intercepted PER events which can occurr in addition to any program interrupt. Signed-off-by:
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Jens Freimann authored
This patch adds fields which are currently missing but needed for the correct injection of interrupts. This is based on a patch by David Hildenbrand Signed-off-by:
Jens Freimann <jfrei@linux.vnet.ibm.com> Acked-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
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Jens Freimann authored
per_perc_atmid is currently a two-byte field that combines two fields, the PER code and the PER Addressing-and-Translation-Mode Identification (ATMID) Let's make them accessible indepently and also rename per_cause to per_code. Signed-off-by:
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Jens Freimann authored
According to the Principles of Operation, at offset 0xA3 in the lowcore we have the "Architectural-Mode identification", not an "access identification". Signed-off-by:
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Heiko Carstens authored
Add kerneldoc comment to kvm_s390_real_to_abs() and change the code so it matches the coding style of the rest of gaccess.h. Signed-off-by:
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Heiko Carstens authored
Signed-off-by:
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Heiko Carstens authored
Convert handle_stsi() to new guest access functions. Signed-off-by:
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Heiko Carstens authored
Convert handle lctl[g]() to new guest access functions. Signed-off-by:
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Heiko Carstens authored
Convert handle_stidp() to new guest access functions. Signed-off-by:
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Heiko Carstens authored
Convert handle_lpsw[e]() to new guest access functions. Signed-off-by:
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Cornelia Huck authored
The tpi instruction should be suppressed on addressing and protection exceptions, so we need to re-inject the dequeued io interrupt in that case. Signed-off-by:
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Heiko Carstens authored
Convert handle_tpi() to new guest access functions. The code now sets up a structure which is copied with a single call to guest space instead of issuing several separate guest access calls. This is necessary since the to be copied data may cross a page boundary. If a protection exception happens while accessing any of the pages, the instruction is suppressed and may not have modified any memory contents. Signed-off-by:
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Heiko Carstens authored
Convert handle_test_block() to new guest access functions. Signed-off-by:
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Heiko Carstens authored
Convert handle_store_cpu_address() to new guest access functions. Signed-off-by:
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Heiko Carstens authored
Convert handle_store_prefix() to new guest access functions. Signed-off-by:
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Heiko Carstens authored
Convert handle_set_clock() to new guest access functions. Signed-off-by:
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Heiko Carstens authored
Convert __sigp_set_prefix() and handle_set_prefix() to new guest access functions. Signed-off-by:
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Heiko Carstens authored
Convert kvm_s390_store_status_unloaded() to new guest access functions. Signed-off-by:
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Heiko Carstens authored
Convert handle_prog() to new guest access functions. Also make the code a bit more readable and look at the return code of write_guest_lc() which was missing before. Signed-off-by:
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Heiko Carstens authored
Convert pfault code to new guest access functions. Signed-off-by:
Dominik Dingel <dingel@linux.vnet.ibm.com> Signed-off-by:
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Heiko Carstens authored
Convert handle_stfl() to new guest access functions. Signed-off-by:
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Jens Freimann authored
Convert local irqs in __do_deliver_interrupt() to new guest access functions. Signed-off-by:
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Heiko Carstens authored
Convert __do_deliver_interrupt() to new guest access functions. Signed-off-by:
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Heiko Carstens authored
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