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2009-06-29Revert "Introduce reset notifier order"Jan Kiszka
This reverts commit 8217606e6edb49591b4a6fd5a0d1229cebe470a9 (and updates later added users of qemu_register_reset), we solved the problem it originally addressed less invasively. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-06-29kvm: Rework VCPU synchronizationJan Kiszka
During startup and after reset we have to synchronize user space to the in-kernel KVM state. Namely, we need to transfer the VCPU registers when they change due to VCPU as well as APIC reset. This patch refactors the required hooks so that kvm_init_vcpu registers its own per-VCPU reset handler and adds a cpu_synchronize_state to the APIC reset. That way we no longer depend on the new reset order (and can drop this disliked interface again) and we can even drop a KVM hook in main(). Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-06-16kvm: Fix IRQ injection into full queueJan Kiszka
User space may only inject interrupts during kvm_arch_pre_run if ready_for_interrupt_injection is set in kvm_run. But that field is updated on exit from KVM_RUN, so we must ensure that we enter the kernel after potentially queuing an interrupt, otherwise we risk to loose one - like it happens with the current code against latest kernel modules (since kvm-86) that started to queue only a single interrupt. Fix the problem by reordering kvm_cpu_exec. Credits go to Gleb Natapov for analyzing the issue in details. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-06-07kvm: Improve upgrade notes when facing unsupported kernelsJan Kiszka
Users complained that it is not obvious what to do when kvm refuses to build or run due to an unsupported host kernel, so let's improve the hints. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
2009-05-22kvm: x86: Save/restore KVM-specific CPU statesJan Kiszka
Save and restore all so far neglected KVM-specific CPU states. Handling the TSC stabilizes migration in KVM mode. The interrupt_bitmap and mp_state are currently unused, but will become relevant for in-kernel irqchip support. By including proper saving/restoring already, we avoid having to increment CPU_SAVE_VERSION later on once again. v2: - initialize mp_state runnable (for the boot CPU) Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-05-22kvm: Rework VCPU resetJan Kiszka
Use standard callback with highest order to synchronize VCPU on reset after all device callbacks were execute. This allows to remove the special kvm hook in qemu_system_reset. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-05-22kvm: Rework dirty bitmap synchronizationJan Kiszka
Extend kvm_physical_sync_dirty_bitmap() so that is can sync across multiple slots. Useful for updating the whole dirty log during migration. Moreover, properly pass down errors the whole call chain. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-05-22kvm: Fix dirty log temporary buffer sizeJan Kiszka
The buffer passed to KVM_GET_DIRTY_LOG requires one bit per page. Fix the size calculation in kvm_physical_sync_dirty_bitmap accordingly, avoiding allocation of extremly oversized buffers. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-05-22kvm: Introduce kvm_set_migration_logJan Kiszka
Introduce a global dirty logging flag that enforces logging for all slots. This can be used by the live migration code to enable/disable global logging withouth destroying the per-slot setting. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-05-22kvm: Conditionally apply workaround for KVM slot handling bugJan Kiszka
Only apply the workaround for broken slot joining in KVM when the capability was not found that signals the corresponding fix existence. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-05-20kvm: add error message for when SMP is requestedMark McLoughlin
Right now, if you try e.g. '-smp 2' you just get 'failed to initialize KVM'. Signed-off-by: Mark McLoughlin <markmc@redhat.com>
2009-05-08Introduce kvm_check_extension to check if KVM extensions are supportedAnthony Liguori
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-05-01kvm: Avoid COW if KVM MMU is asynchronousJan Kiszka
Avi Kivity wrote: > Suggest wrapping in a function and hiding it deep inside kvm-all.c. > Done in v2: ----------> If the KVM MMU is asynchronous (kernel does not support MMU_NOTIFIER), we have to avoid COW for the guest memory. Otherwise we risk serious breakage when guest pages change there physical locations due to COW after fork. Seen when forking smbd during runtime via -smb. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-05-01kvm: Relax aligment check of kvm_set_phys_memJan Kiszka
There is no need to reject an unaligned memory region registration if the region will be I/O memory and it will not split an existing KVM slot. This fixes KVM support on PPC. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-04-17kvm: improve handling of overlapping slots (Jan Kiszka)aliguori
This reworks the slot management to handle more patterns of cpu_register_physical_memory*, finally allowing to reset KVM guests (so far address remapping on reset broke the slot management). We could actually handle all possible ones without failing, but a KVM kernel bug in older versions would force us to track all previous fragmentations and maintain them (as that bug prevents registering larger slots that overlap also deleted ones). To remain backward compatible but avoid overly complicated workarounds, we apply a simpler workaround that covers all currently used patterns. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7139 c046a42c-6fe2-441c-8c8c-71466251a162
2009-04-17kvm: Add sanity checks to slot management (Jan Kiszka)aliguori
Fail loudly if we run out of memory slot. Make sure that dirty log start/stop works with consistent memory regions by reporting invalid parameters. This reveals several inconsistencies in the vga code, patch to fix them follows later in this series. And, for simplicity reasons, also catch and report unaligned memory regions passed to kvm_set_phys_mem (KVM works on page basis). Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7138 c046a42c-6fe2-441c-8c8c-71466251a162
2009-04-17kvm: Cleanup unmap condition in kvm_set_phys_mem (Jan Kiszka)aliguori
Testing for TLB_MMIO on unmap makes no sense as A) that flag belongs to CPUTLBEntry and not to io_memory slots or physical addresses and B) we already use a different condition before mapping. So make this test consistent. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7137 c046a42c-6fe2-441c-8c8c-71466251a162
2009-04-11Remove code phys_ram_base uses.pbrook
Signed-off-by: Paul Brook <paul@codesourcery.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7085 c046a42c-6fe2-441c-8c8c-71466251a162
2009-03-12Guest debugging support for KVM (Jan Kiszka)aliguori
This is a backport of the guest debugging support for the KVM accelerator that is now part of the KVM tree. It implements the reworked KVM kernel API for guest debugging (KVM_CAP_SET_GUEST_DEBUG) which is not yet part of any mainline kernel but will probably be 2.6.30 stuff. So far supported is x86, but PPC is expected to catch up soon. Core features are: - unlimited soft-breakpoints via code patching - hardware-assisted x86 breakpoints and watchpoints Changes in this version: - use generic hook cpu_synchronize_state to transfer registers between user space and kvm - push kvm_sw_breakpoints into KVMState Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6825 c046a42c-6fe2-441c-8c8c-71466251a162
2009-03-06Fix race condition on access to env->interrupt_requestaurel32
env->interrupt_request is accessed as the bit level from both main code and signal handler, making a race condition possible even on CISC CPU. This causes freeze of QEMU under high load when running the dyntick clock. The patch below move the bit corresponding to CPU_INTERRUPT_EXIT in a separate variable, declared as volatile sig_atomic_t, so it should be work even on RISC CPU. We may want to move the cpu_interrupt(env, CPU_INTERRUPT_EXIT) case in its own function and get rid of CPU_INTERRUPT_EXIT. That can be done later, I wanted to keep the patch short for easier review. Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6728 c046a42c-6fe2-441c-8c8c-71466251a162
2009-02-05toplevel: remove error handling from qemu_malloc() callers (Avi Kivity)aliguori
Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6531 c046a42c-6fe2-441c-8c8c-71466251a162
2008-12-18KVM: Silence unused s warningaurel32
Move s under #ifdef to avoid compiler warning. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6086 c046a42c-6fe2-441c-8c8c-71466251a162
2008-12-15kvm: sync vcpu state during initialization (Hollis Blanchard)aliguori
Currently on x86, qemu initializes CPUState but KVM ignores it and does its own vcpu initialization. However, PowerPC KVM needs to be able to set the initial register state to support the -kernel and -append options. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6060 c046a42c-6fe2-441c-8c8c-71466251a162
2008-12-09KVM: Coalesced MMIO supportaliguori
MMIO exits are more expensive in KVM or Xen than in QEMU because they involve, at least, privilege transitions. However, MMIO write operations can be effectively batched if those writes do not have side effects. Good examples of this include VGA pixel operations when in a planar mode. As it turns out, we can get a nice boost in other areas too. Laurent mentioned a 9.7% performance boost in iperf with the coalesced MMIO changes for the e1000 when he originally posted this work for KVM. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5961 c046a42c-6fe2-441c-8c8c-71466251a162
2008-12-09Disable KVM support if the kernel modules have broken memory slot handlingaliguori
Prior to kvm-80, memory slot deletion was broken in the KVM kernel modules. In kvm-81, a new capability is introduced to signify that this problem has been fixed. Since we rely on being able to delete memory slots, refuse to work with any kernel module that does not have this capability present. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5960 c046a42c-6fe2-441c-8c8c-71466251a162
2008-12-04Add virtio-balloon supportaliguori
This adds a VirtIO based balloon driver. It uses madvise() to actually balloon the memory when possible. Until 2.6.27, KVM forced memory pinning so we must disable ballooning unless the kernel actually supports it when using KVM. It's always safe when using TCG. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5874 c046a42c-6fe2-441c-8c8c-71466251a162
2008-11-24kvm: Introduce kvm logging interface (Glauber Costa)aliguori
Introduce functions to control logging of memory regions. We select regions based on its start address, a guest_physical_addr (target_phys_addr_t, in qemu nomenclature). The main user of this interface right now is VGA optimization (a way of reducing the number of mmio exits). Signed-off-by: Glauber Costa <glommer@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5792 c046a42c-6fe2-441c-8c8c-71466251a162
2008-11-19Make KVMSlot a real structurealiguori
struct kvm_userspace_memory_region does not use QEMU friendly types to define memory slots. This results in lots of ugly casting with warnings on 32-bit platforms. This patch introduces a proper KVMSlot structure that uses QEMU types to describe memory slots. This eliminates many of the casts and isolates the type conversions to one spot. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5755 c046a42c-6fe2-441c-8c8c-71466251a162
2008-11-19kvm: de-register mem region for MMIO (Glauber Costa)aliguori
Besides unassigned memory, we also don't care about MMIO. So if we're giving an MMIO area that is already registered, wipe it out. Signed-off-by: Glauber Costa <glommer@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5753 c046a42c-6fe2-441c-8c8c-71466251a162
2008-11-18Make KVM slot management more robustaliguori
KVM keeps track of physical memory based on slots in the kernel. The current code that translates QEMU memory mappings to slots work but is not robust in the fact of reregistering partial regions of memory. This patch does the right thing for reregistering partial regions of memory. It also prevents QEMU from using KVM private slots. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5734 c046a42c-6fe2-441c-8c8c-71466251a162
2008-11-13Define kvm_ioctl in the same way as ioctlaliguori
The third argument to ioctl is a ... which allows any value to be passed. In practice, glibc always treats the argument as a void *. Do the same thing for the kvm ioctls to keep things consistent with a traditional ioctl. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5715 c046a42c-6fe2-441c-8c8c-71466251a162
2008-11-10KVM: simplify kvm_cpu_exec hookaliguori
We don't need to use cpu_loop_exit() because we never use the condition codes so everything can be folded into a single case. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5669 c046a42c-6fe2-441c-8c8c-71466251a162
2008-11-05Add missing files to KVM commit.aliguori
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5629 c046a42c-6fe2-441c-8c8c-71466251a162
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