- 11 Sep, 2014 1 commit
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Paolo Bonzini authored
Merge tag 'kvm-s390-next-20140910' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into kvm-next KVM: s390: Fixes and features for next (3.18) 1. Crypto/CPACF support: To enable the MSA4 instructions we have to provide a common control structure for each SIE control block 2. Two cleanups found by a static code checker: one redundant assignment and one useless if 3. Fix the page handling of the diag10 ballooning interface. If the guest freed the pages at absolute 0 some checks and frees were incorrect 4. Limit guests to 16TB 5. Add __must_check to interrupt injection code
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- 10 Sep, 2014 9 commits
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Christian Borntraeger authored
r is already initialized to 0. Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by:
Thomas Huth <thuth@linux.vnet.ibm.com>
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Christian Borntraeger authored
The old handling of prefix pages was broken in the diag10 ballooner. We now rely on gmap_discard to check for start > end and do a slow path if the prefix swap pages are affected: 1. discard the pages from start to prefix 2. discard the absolute 0 pages 3. discard the pages after prefix swap to end Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by:
Thomas Huth <thuth@linux.vnet.ibm.com>
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Christian Borntraeger authored
Due to the earlier check we know that ipte_lock_count must be 0. No need to add a useless if. Let's make clear that we are going to always wakeup when we execute that code. Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Acked-by:
Heiko Carstens <heiko.carstens@de.ibm.com>
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Christian Borntraeger authored
We must not fallthrough if the conditions for external call are not met. Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by:
Thomas Huth <thuth@linux.vnet.ibm.com> Cc: stable@vger.kernel.org
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Christian Borntraeger authored
Currently we fill up a full 5 level page table to hold the guest mapping. Since commit "support gmap page tables with less than 5 levels" we can do better. Having more than 4 TB might be useful for some testing scenarios, so let's just limit ourselves to 16TB guest size. Having more than that is totally untested as I do not have enough swap space/memory. We continue to allow ucontrol the full size. Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Acked-by:
Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Christian Borntraeger authored
We now propagate interrupt injection errors back to the ioctl. We should mark functions that might fail with __must_check. Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Acked-by:
Jens Freimann <jfrei@linux.vnet.ibm.com>
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Tony Krowiak authored
We have to provide a per guest crypto block for the CPUs to enable MSA4 instructions. According to icainfo on z196 or later this enables CCM-AES-128, CMAC-AES-128, CMAC-AES-192 and CMAC-AES-256. Signed-off-by:
Tony Krowiak <akrowiak@linux.vnet.ibm.com> Reviewed-by:
David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by:
Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by:
Michael Mueller <mimu@linux.vnet.ibm.com> Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> [split MSA4/protected key into two patches]
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Alex Bennée authored
It looks like when this was initially merged it got accidentally included in the following section. I've just moved it back in the correct section and re-numbered it as other ioctls have been added since. Signed-off-by: Alex BennÃ
© e <alex.bennee@linaro.org> Acked-by:Borislav Petkov <bp@suse.de> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Alex Bennée authored
In preparation for working on the ARM implementation I noticed the debug interface was missing from the API document. I've pieced together the expected behaviour from the code and commit messages written it up as best I can. Signed-off-by: Alex BennÃ
© e <alex.bennee@linaro.org> Signed-off-by:Paolo Bonzini <pbonzini@redhat.com>
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- 05 Sep, 2014 5 commits
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Christian Borntraeger authored
__kvm_set_memory_region sets r to EINVAL very early. Doing it again is not necessary. The same is true later on, where r is assigned -ENOMEM twice. Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Christian Borntraeger authored
The first statement of kvm_dev_ioctl is long r = -EINVAL; No need to reassign the same value. Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Christian Borntraeger authored
The expression `vcpu->spin_loop.in_spin_loop' is always true, because it is evaluated only when the condition `!vcpu->spin_loop.in_spin_loop' is false. Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Paolo Bonzini authored
Currently, if a permission error happens during the translation of the final GPA to HPA, walk_addr_generic returns 0 but does not fill in walker->fault. To avoid this, add an x86_exception* argument to the translate_gpa function, and let it fill in walker->fault. The nested_page_fault field will be true, since the walk_mmu is the nested_mmu and translate_gpu instead operates on the "outer" (NPT) instance. Reported-by:
Valentine Sinitsyn <valentine.sinitsyn@gmail.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Paolo Bonzini authored
If a nested page fault happens during emulation, we will inject a vmexit, not a page fault. However because writeback happens after the injection, we will write ctxt->eip from L2 into the L1 EIP. We do not write back if an instruction caused an interception vmexit---do the same for page faults. Suggested-by:
Gleb Natapov <gleb@kernel.org> Reviewed-by:
Gleb Natapov <gleb@kernel.org> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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- 03 Sep, 2014 6 commits
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Paolo Bonzini authored
This is similar to what the EPT code does with the exit qualification. This allows the guest to see a valid value for bits 33:32. Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Paolo Bonzini authored
Bit 8 would be the "global" bit, which does not quite make sense for non-leaf page table entries. Intel ignores it; AMD ignores it in PDEs, but reserves it in PDPEs and PML4Es. The SVM test is relying on this behavior, so enforce it. Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Tiejun Chen authored
Just reuse rsvd_bits() inside kvm_set_mmio_spte_mask() for slightly better code. Signed-off-by:
Tiejun Chen <tiejun.chen@intel.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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David Matlack authored
The following events can lead to an incorrect KVM_EXIT_MMIO bubbling up to userspace: (1) Guest accesses gpa X without a memory slot. The gfn is cached in struct kvm_vcpu_arch (mmio_gfn). On Intel EPT-enabled hosts, KVM sets the SPTE write-execute-noread so that future accesses cause EPT_MISCONFIGs. (2) Host userspace creates a memory slot via KVM_SET_USER_MEMORY_REGION covering the page just accessed. (3) Guest attempts to read or write to gpa X again. On Intel, this generates an EPT_MISCONFIG. The memory slot generation number that was incremented in (2) would normally take care of this but we fast path mmio faults through quickly_check_mmio_pf(), which only checks the per-vcpu mmio cache. Since we hit the cache, KVM passes a KVM_EXIT_MMIO up to userspace. This patch fixes the issue by using the memslot generation number to validate the mmio cache. Cc: stable@vger.kernel.org Signed-off-by:
David Matlack <dmatlack@google.com> [xiaoguangrong: adjust the code to make it simpler for stable-tree fix.] Signed-off-by:
Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Reviewed-by:
David Matlack <dmatlack@google.com> Reviewed-by:
Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Tested-by:
David Matlack <dmatlack@google.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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David Matlack authored
vcpu exits and memslot mutations can run concurrently as long as the vcpu does not aquire the slots mutex. Thus it is theoretically possible for memslots to change underneath a vcpu that is handling an exit. If we increment the memslot generation number again after synchronize_srcu_expedited(), vcpus can safely cache memslot generation without maintaining a single rcu_dereference through an entire vm exit. And much of the x86/kvm code does not maintain a single rcu_dereference of the current memslots during each exit. We can prevent the following case: vcpu (CPU 0) | thread (CPU 1) --------------------------------------------+-------------------------- 1 vm exit | 2 srcu_read_unlock(&kvm->srcu) | 3 decide to cache something based on | old memslots | 4 | change memslots | (increments generation) 5 | synchronize_srcu(&kvm->srcu); 6 retrieve generation # from new memslots | 7 tag cache with new memslot generation | 8 srcu_read_unlock(&kvm->srcu) | ... | <action based on cache occurs even | though the caching decision was based | on the old memslots> | ... | <action *continues* to occur until next | memslot generation change, which may | be never> | | By incrementing the generation after synchronizing with kvm->srcu readers, we ensure that the generation retrieved in (6) will become invalid soon after (8). Keeping the existing increment is not strictly necessary, but we do keep it and just move it for consistency from update_memslots to install_new_memslots. It invalidates old cached MMIOs immediately, instead of having to wait for the end of synchronize_srcu_expedited, which makes the code more clearly correct in case CPU 1 is preempted right after synchronize_srcu() returns. To avoid halving the generation space in SPTEs, always presume that the low bit of the generation is zero when reconstructing a generation number out of an SPTE. This effectively disables MMIO caching in SPTEs during the call to synchronize_srcu_expedited. Using the low bit this way is somewhat like a seqcount---where the protected thing is a cache, and instead of retrying we can simply punt if we observe the low bit to be 1. Cc: stable@vger.kernel.org Signed-off-by:
David Matlack <dmatlack@google.com> Reviewed-by:
Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Reviewed-by:
David Matlack <dmatlack@google.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Paolo Bonzini authored
The next patch will give a meaning (a la seqcount) to the low bit of the generation number. Ensure that it matches between kvm->memslots->generation and kvm_current_mmio_generation(). Cc: stable@vger.kernel.org Reviewed-by:
David Matlack <dmatlack@google.com> Reviewed-by:
Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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- 29 Aug, 2014 13 commits
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Paolo Bonzini authored
The check introduced in commit d7a2a246 (KVM: x86: #GP when attempts to write reserved bits of Variable Range MTRRs, 2014-08-19) will break if the guest maxphyaddr is higher than the host's (which sometimes happens depending on your hardware and how QEMU is configured). To fix this, use cpuid_maxphyaddr similar to how the APIC_BASE MSR does already. Reported-by:
Jan Kiszka <jan.kiszka@siemens.com> Tested-by:
Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Radim Krčmář authored
In the beggining was on_each_cpu(), which required an unused argument to kvm_arch_ops.hardware_{en,dis}able, but this was soon forgotten. Remove unnecessary arguments that stem from this. Signed-off-by: Radim KrÄmáÅ
™ <rkrcmar@redhat.com> Signed-off-by:Paolo Bonzini <pbonzini@redhat.com>
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Radim Krčmář authored
Using static inline is going to save few bytes and cycles. For example on powerpc, the difference is 700 B after stripping. (5 kB before) This patch also deals with two overlooked empty functions: kvm_arch_flush_shadow was not removed from arch/mips/kvm/mips.c 2df72e9b KVM: split kvm_arch_flush_shadow and kvm_arch_sched_in never made it into arch/ia64/kvm/kvm-ia64.c. e790d9ef KVM: add kvm_arch_sched_in Signed-off-by: Radim KrÄmáÅ
™ <rkrcmar@redhat.com> Signed-off-by:Paolo Bonzini <pbonzini@redhat.com>
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Paolo Bonzini authored
Opaque KVM structs are useful for prototypes in asm/kvm_host.h, to avoid "'struct foo' declared inside parameter list" warnings (and consequent breakage due to conflicting types). Move them from individual files to a generic place in linux/kvm_types.h. Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Paolo Bonzini authored
These are not explicitly aligned, and do not require alignment on AVX. Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Alex Williamson authored
Windows 8.1 guest with NVIDIA driver and GPU fails to boot with an emulation failure. The KVM spew suggests the fault is with lack of movntdq emulation (courtesy of Paolo): Code=02 00 00 b8 08 00 00 00 f3 0f 6f 44 0a f0 f3 0f 6f 4c 0a e0 <66> 0f e7 41 f0 66 0f e7 49 e0 48 83 e9 40 f3 0f 6f 44 0a 10 f3 0f 6f 0c 0a 66 0f e7 41 10 $ as -o a.out .section .text .byte 0x66, 0x0f, 0xe7, 0x41, 0xf0 .byte 0x66, 0x0f, 0xe7, 0x49, 0xe0 $ objdump -d a.out 0: 66 0f e7 41 f0 movntdq %xmm0,-0x10(%rcx) 5: 66 0f e7 49 e0 movntdq %xmm1,-0x20(%rcx) Add the necessary emulation. Signed-off-by:
Alex Williamson <alex.williamson@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Nadav Amit authored
Unlike VMCALL, the instructions VMXOFF, VMLAUNCH and VMRESUME should cause a UD exception in real-mode or vm86. However, the emulator considers all these instructions the same for the matter of mode checks, and emulation upon exit due to #UD exception. As a result, the hypervisor behaves incorrectly on vm86 mode. VMXOFF, VMLAUNCH or VMRESUME cause on vm86 exit due to #UD. The hypervisor then emulates these instruction and inject #GP to the guest instead of #UD. This patch creates a new group for these instructions and mark only VMCALL as an instruction which can be emulated. Signed-off-by:
Nadav Amit <namit@cs.technion.ac.il> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Paolo Bonzini authored
Sparse reports the following easily fixed warnings: arch/x86/kvm/vmx.c:8795:48: sparse: Using plain integer as NULL pointer arch/x86/kvm/vmx.c:2138:5: sparse: symbol vmx_read_l1_tsc was not declared. Should it be static? arch/x86/kvm/vmx.c:6151:48: sparse: Using plain integer as NULL pointer arch/x86/kvm/vmx.c:8851:6: sparse: symbol vmx_sched_in was not declared. Should it be static? arch/x86/kvm/svm.c:2162:5: sparse: symbol svm_read_l1_tsc was not declared. Should it be static? Cc: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by:
Fengguang Wu <fengguang.wu@intel.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Wanpeng Li authored
This patch fix bug https://bugzilla.kernel.org/show_bug.cgi?id=61411 TPR shadow/threshold feature is important to speed up the Windows guest. Besides, it is a must feature for certain VMM. We map virtual APIC page address and TPR threshold from L1 VMCS. If TPR_BELOW_THRESHOLD VM exit is triggered by L2 guest and L1 interested in, we inject it into L1 VMM for handling. Reviewed-by:
Paolo Bonzini <pbonzini@redhat.com> Signed-off-by:
Wanpeng Li <wanpeng.li@linux.intel.com> [Add PAGE_ALIGNED check, do not write useless virtual APIC page address if TPR shadowing is disabled. - Paolo] Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Wanpeng Li authored
Introduce function nested_get_vmcs12_pages() to check the valid of nested apic access page and virtual apic page earlier. Signed-off-by:
Wanpeng Li <wanpeng.li@linux.intel.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Christoffer Dall authored
The idea between capabilities and the KVM_CHECK_EXTENSION ioctl is that userspace can, at run-time, determine if a feature is supported or not. This allows KVM to being supporting a new feature with a new kernel version without any need to update user space. Unfortunately, since the definition of KVM_CAP_USER_NMI was guarded by #ifdef __KVM_HAVE_USER_NMI, such discovery still required a user space update. Therefore, unconditionally export KVM_CAP_USER_NMI and change the the typo in the comment for the IOCTL number definition as well. Signed-off-by:
Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Christoffer Dall authored
The idea between capabilities and the KVM_CHECK_EXTENSION ioctl is that userspace can, at run-time, determine if a feature is supported or not. This allows KVM to being supporting a new feature with a new kernel version without any need to update user space. Unfortunately, since the definition of KVM_CAP_READONLY_MEM was guarded by #ifdef __KVM_HAVE_READONLY_MEM, such discovery still required a user space update. Therefore, unconditionally export KVM_CAP_READONLY_MEM and change the in-kernel conditional to rely on __KVM_HAVE_READONLY_MEM. Signed-off-by:
Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Christian Borntraeger authored
commit ab3f285f ("KVM: s390/mm: try a cow on read only pages for key ops")' misaligned a code block. Let's fixup the indentation. Reported-by:
Ben Hutchings <ben@decadent.org.uk> Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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- 26 Aug, 2014 4 commits
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Paolo Bonzini authored
Merge tag 'kvm-s390-next-20140825' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD KVM: s390: Fixes and features for 3.18 part 1 1. The usual cleanups: get rid of duplicate code, use defines, factor out the sync_reg handling, additional docs for sync_regs, better error handling on interrupt injection 2. We use KVM_REQ_TLB_FLUSH instead of open coding tlb flushes 3. Additional registers for kvm_run sync regs. This is usually not needed in the fast path due to eventfd/irqfd, but kvm stat claims that we reduced the overhead of console output by ~50% on my system 4. A rework of the gmap infrastructure. This is the 2nd step towards host large page support (after getting rid of the storage key dependency). We introduces two radix trees to store the guest-to-host and host-to-guest translations. This gets us rid of most of the page-table walks in the gmap code. Only one in __gmap_link is left, this one is required to link the shadow page table to the process page table. Finally this contains the plumbing to support gmap page tables with less than 5 levels.
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Martin Schwidefsky authored
The radix tree rework removed all code that uses the gmap_rmap and gmap_pgtable data structures. Remove these outdated definitions. Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com>
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Martin Schwidefsky authored
Add an addressing limit to the gmap address spaces and only allocate the page table levels that are needed for the given limit. The limit is fixed and can not be changed after a gmap has been created. Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com>
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Martin Schwidefsky authored
Store the target address for the gmap segments in a radix tree instead of using invalid segment table entries. gmap_translate becomes a simple radix_tree_lookup, gmap_fault is split into the address translation with gmap_translate and the part that does the linking of the gmap shadow page table with the process page table. A second radix tree is used to keep the pointers to the segment table entries for segments that are mapped in the guest address space. On unmap of a segment the pointer is retrieved from the radix tree and is used to carry out the segment invalidation in the gmap shadow page table. As the radix tree can only store one pointer, each host segment may only be mapped to exactly one guest location. Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com>
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- 25 Aug, 2014 2 commits
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Paolo Bonzini authored
Fix commit 7b46268d, which mistakenly included the new tracepoint under #ifdef CONFIG_X86_64. Reported-by:
Sabrina Dubroca <sd@queasysnail.net> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Paolo Bonzini authored
Merge tag 'kvm-s390-20140825' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD Here are two fixes for s390 KVM code that prevent: 1. a malicious user to trigger a kernel BUG 2. a malicious user to change the storage key of read-only pages
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