- 04 Dec, 2014 14 commits
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David Hildenbrand authored
kvm_enter_guest() has to be called with preemption disabled and will set PF_VCPU. Current code takes PF_VCPU as a hint that the VCPU thread is running and therefore needs no yield. However, the check on PF_VCPU is wrong on s390, where preemption has to stay enabled in order to correctly process page faults. Thus, s390 reenables preemption and starts to execute the guest. The thread might be scheduled out between kvm_enter_guest() and kvm_exit_guest(), resulting in PF_VCPU being set but not being run. When this happens, the opportunity for directed yield is missed. However, this check is done already in kvm_vcpu_on_spin before calling kvm_vcpu_yield_loop: if (!ACCESS_ONCE(vcpu->preempted)) continue; so the check on PF_VCPU is superfluous in general, and this patch removes it. Signed-off-by:David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Igor Mammedov authored
Current linear search doesn't scale well when large amount of memslots is used and looked up slot is not in the beginning memslots array. Taking in account that memslots don't overlap, it's possible to switch sorting order of memslots array from 'npages' to 'base_gfn' and use binary search for memslot lookup by GFN. As result of switching to binary search lookup times are reduced with large amount of memslots. Following is a table of search_memslot() cycles during WS2008R2 guest boot. boot, boot + ~10 min mostly same of using it, slot lookup randomized lookup max average average cycles cycles cycles 13 slots : 1450 28 30 13 slots : 1400 30 40 binary search 117 slots : 13000 30 460 117 slots : 2000 35 180 binary search Signed-off-by:Igor Mammedov <imammedo@redhat.com> Signed-off-by:
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Igor Mammedov authored
it will allow to use binary search for GFN -> memslot lookups, reducing lookup cost with large slots amount. Signed-off-by:
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Igor Mammedov authored
In typical guest boot workload only 2-3 memslots are used extensively, and at that it's mostly the same memslot lookup operation. Adding LRU cache improves average lookup time from 46 to 28 cycles (~40%) for this workload. Signed-off-by:
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Igor Mammedov authored
UP/DOWN shift loops will shift array in needed direction and stop at place where new slot should be placed regardless of old slot size. Signed-off-by:
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Igor Mammedov authored
if number of pages haven't changed sorting algorithm will do nothing, so there is no need to do extra check to avoid entering sorting logic. Signed-off-by:
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Radim Krčmář authored
While fixing an x2apic bug, 17d68b76 KVM: x86: fix guest-initiated crash with x2apic (CVE-2013-6376) we've made only one cluster available. This means that the amount of logically addressible x2APICs was reduced to 16 and VCPUs kept overwriting themselves in that region, so even the first cluster wasn't set up correctly. This patch extends x2APIC support back to the logical_map's limit, and keeps the CVE fixed as messages for non-present APICs are dropped. Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com> Signed-off-by:
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Radim Krčmář authored
They can't be violated now, but play it safe for the future. Signed-off-by:
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Radim Krčmář authored
x2apic allows destinations > 0xff and we don't want them delivered to lower APICs. They are correctly handled by doing nothing. Signed-off-by:
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Radim Krčmář authored
Physical mode can't address more than one APIC, but lowest-prio is allowed, so we just reuse our paths. SDM 10.6.2.1 Physical Destination: Also, for any non-broadcast IPI or I/O subsystem initiated interrupt with lowest priority delivery mode, software must ensure that APICs defined in the interrupt address are present and enabled to receive interrupts. We could warn on top of that. Signed-off-by:
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Radim Krčmář authored
False from kvm_irq_delivery_to_apic_fast() means that we don't handle it in the fast path, but we still return false in cases that were perfectly handled, fix that. Signed-off-by:
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Radim Krčmář authored
0x830 MSR is 0x300 xAPIC MMIO, which is MSR_ICR. Signed-off-by: Radim KrÄmáÅ
™ <rkrcmar@redhat.com> Signed-off-by: -
Nadav Amit authored
x2APIC has no registers for DFR and ICR2 (see Intel SDM 10.12.1.2 "x2APIC Register Address Space"). KVM needs to cause #GP on such accesses. Fix it (DFR and ICR2 on read, ICR2 on write, DFR already handled on writes). Signed-off-by:
Nadav Amit <namit@cs.technion.ac.il> Signed-off-by:
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Nadav Amit authored
Certain x86 instructions that use modrm operands only allow memory operand (i.e., mod012), and cause a #UD exception otherwise. KVM ignores this fact. Currently, the instructions that are such and are emulated by KVM are MOVBE, MOVNTPS, MOVNTPD and MOVNTI. MOVBE is the most blunt example, since it may be emulated by the host regardless of MMIO. The fix introduces a new group for handling such instructions, marking mod3 as illegal instruction. Signed-off-by:
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- 03 Dec, 2014 1 commit
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Paolo Bonzini authored
Merge tag 'kvm-s390-next-20141128' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD KVM: s390: Several fixes,cleanups and reworks Here is a bunch of fixes that deal mostly with architectural compliance: - interrupt priorities - interrupt handling - intruction exit handling We also provide a helper function for getting the guest visible storage key.
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- 28 Nov, 2014 11 commits
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Jens Freimann authored
Allow to specify CR14, logout area, external damage code and failed storage address. Since more then one machine check can be indicated to the guest at a time we need to combine all indication bits with already pending requests. Signed-off-by:
Jens Freimann <jfrei@linux.vnet.ibm.com> Reviewed-by:
Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by:
Christian Borntraeger <borntraeger@de.ibm.com>
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Jens Freimann authored
This patch adapts handling of local interrupts to be more compliant with the z/Architecture Principles of Operation and introduces a data structure which allows more efficient handling of interrupts. * get rid of li->active flag, use bitmap instead * Keep interrupts in a bitmap instead of a list * Deliver interrupts in the order of their priority as defined in the PoP * Use a second bitmap for sigp emergency requests, as a CPU can have one request pending from every other CPU in the system. Signed-off-by:
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Jens Freimann authored
Adds a bitmap to the vcpu structure which is used to keep track of local pending interrupts. Also add enum with all interrupt types sorted in order of priority (highest to lowest) Signed-off-by:
Thomas Huth <thuth@linux.vnet.ibm.com> Reviewed-by:
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Jens Freimann authored
Move delivery code for cpu-local interrupt from the huge do_deliver_interrupt() to smaller functions which handle one type of interrupt. Signed-off-by:
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Jens Freimann authored
Get rid of open coded value for virtio and pfault completion interrupts. Signed-off-by:
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David Hildenbrand authored
The 32bit external interrupt parameter is only valid for timing-alert and service-signal interrupts. Signed-off-by:
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Jens Freimann authored
In preparation for the rework of the local interrupt injection code, factor out injection routines from kvm_s390_inject_vcpu(). Signed-off-by:
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Jason J. Herne authored
Define get_guest_storage_key which can be used to get the value of a guest storage key. This compliments the functionality provided by the helper function set_guest_storage_key. Both functions are needed for live migration of s390 guests that use storage keys. Signed-off-by:
Jason J. Herne <jjherne@linux.vnet.ibm.com> Reviewed-by:
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Christian Borntraeger authored
When injecting a floating interrupt and no CPU is idle we kick one CPU to do an external exit. In case of I/O we should trigger an I/O exit instead. This does not matter for Linux guests as external and I/O interrupts are enabled/disabled at the same time, but play safe anyway. The same holds true for machine checks. Since there is no special exit, just reuse the generic stop exit. The injection code inside the VCPU loop will recheck anyway and rearm the proper exits (e.g. control registers) if necessary. Signed-off-by:
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Thomas Huth authored
A couple of our interception handlers rewind the PSW to the beginning of the instruction to run the intercepted instruction again during the next SIE entry. This normally works fine, but there is also the possibility that the instruction did not get run directly but via an EXECUTE instruction. In this case, the PSW does not point to the instruction that caused the interception, but to the EXECUTE instruction! So we've got to rewind the PSW to the beginning of the EXECUTE instruction instead. This is now accomplished with a new helper function kvm_s390_rewind_psw(). Signed-off-by:
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Thomas Huth authored
This patch includes two small fixes for the PFMF handler: First, the start address for PFMF has to be masked according to the current addressing mode, which is now done with kvm_s390_logical_to_effective(). Second, the protection exceptions have a lower priority than the specification exceptions, so the check for low-address protection has to be moved after the last spot where we inject a specification exception. Signed-off-by:
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- 24 Nov, 2014 2 commits
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Paolo Bonzini authored
cs.base is declared as a __u64 variable and vector is a u32 so this causes a static checker warning. The user indeed can set "sipi_vector" to any u32 value in kvm_vcpu_ioctl_x86_set_vcpu_events(), but the value should really have 8-bit precision only. Reported-by:
Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by:
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Paolo Bonzini authored
Create a new header, and hide the device assignment functions there. Move struct kvm_assigned_dev_kernel to assigned-dev.c by modifying arch/x86/kvm/iommu.c to take a PCI device struct. Based on a patch by Radim Krcmar <rkrcmark@redhat.com>. Signed-off-by:
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- 23 Nov, 2014 2 commits
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Paolo Bonzini authored
This feature is not supported inside KVM guests yet, because we do not emulate MSR_IA32_XSS. Mask it out. Cc: stable@vger.kernel.org Signed-off-by: -
Radim Krčmář authored
Now that ia64 is gone, we can hide deprecated device assignment in x86. Notable changes: - kvm_vm_ioctl_assigned_device() was moved to x86/kvm_arch_vm_ioctl() The easy parts were removed from generic kvm code, remaining - kvm_iommu_(un)map_pages() would require new code to be moved - struct kvm_assigned_dev_kernel depends on struct kvm_irq_ack_notifier Signed-off-by:
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- 21 Nov, 2014 3 commits
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Radim Krčmář authored
KVM ia64 is no longer present so new applications shouldn't use them. The main problem is that they most likely didn't work even before, because of a conflict in the #defines: #define KVM_SET_GUEST_DEBUG _IOW(KVMIO, 0x9b, struct kvm_guest_debug) #define KVM_IA64_VCPU_SET_STACK _IOW(KVMIO, 0x9b, void *) The argument to KVM_SET_GUEST_DEBUG is: struct kvm_guest_debug { __u32 control; __u32 pad; struct kvm_guest_debug_arch arch; }; struct kvm_guest_debug_arch { }; meaning that sizeof(struct kvm_guest_debug) == sizeof(void *) == 8 and KVM_SET_GUEST_DEBUG == KVM_IA64_VCPU_SET_STACK. KVM_SET_GUEST_DEBUG is handled in virt/kvm/kvm_main.c before even calling kvm_arch_vcpu_ioctl (which would have handled KVM_IA64_VCPU_SET_STACK), so KVM_IA64_VCPU_SET_STACK would just return -EINVAL. Signed-off-by: -
Radim Krcmar authored
Signed-off-by:
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Paolo Bonzini authored
ia64 does not need them anymore. Ack notifiers become x86-specific too. Suggested-by:
Gleb Natapov <gleb@kernel.org> Reviewed-by:
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- 20 Nov, 2014 2 commits
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Tiejun Chen authored
kvm/ia64 is gone, clean up Documentation too. Signed-off-by: -
Paolo Bonzini authored
KVM for ia64 has been marked as broken not just once, but twice even, and the last patch from the maintainer is now roughly 5 years old. Time for it to rest in peace. Acked-by:
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- 19 Nov, 2014 5 commits
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Nicholas Krause authored
Remove FIXME comments about needing fault addresses to be returned. These are propaagated from walk_addr_generic to gva_to_gpa and from there to ops->read_std and ops->write_std. Signed-off-by:
Nicholas Krause <xerofoify@gmail.com> Signed-off-by:
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Paolo Bonzini authored
The check on the higher limit of the segment, and the check on the maximum accessible size, is the same for both expand-up and expand-down segments. Only the computation of "lim" varies. Signed-off-by: -
Paolo Bonzini authored
register_address has been a duplicate of address_mask ever since the ancestor of __linearize was born in 90de84f5 (KVM: x86 emulator: preserve an operand's segment identity, 2010-11-17). However, we can put it to a better use by including the call to reg_read in register_address. Similarly, the call to reg_rmw can be moved to register_address_increment. Signed-off-by:
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Nadav Amit authored
In __linearize there is check of the condition whether to check if masking of the linear address is needed. It occurs immediately after switch that evaluates the same condition. Merge them. Signed-off-by:
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Nadav Amit authored
When SS is used using a non-canonical address, an #SS exception is generated on real hardware. KVM emulator causes a #GP instead. Fix it to behave as real x86 CPU. Signed-off-by:
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