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2013-08-31ARM: KVM: Fix kvm_set_pte assignmentChristoffer Dall1-1/+1
THe kvm_set_pte function was actually assigning the entire struct to the structure member, which should work because the structure only has that one member, but it is still not very nice. Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
2013-08-13KVM: x86: Update symbolic exit codesJan Kiszka1-2/+3
Add decoding for INVEPT and reorder the list according to the reason numbers. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07KVM: nVMX: Advertise IA32_PAT in VM exit controlArthur Chunqi Li1-3/+5
Advertise VM_EXIT_SAVE_IA32_PAT and VM_EXIT_LOAD_IA32_PAT. Signed-off-by: Arthur Chunqi Li <yzt356@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07KVM: nVMX: Fix up VM_ENTRY_IA32E_MODE control feature reportingJan Kiszka1-1/+5
Do not report that we can enter the guest in 64-bit mode if the host is 32-bit only. This is not supported by KVM. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07KVM: nEPT: Advertise WB type EPTPJan Kiszka1-2/+2
At least WB must be possible. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Reviewed-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07nVMX: Keep arch.pat in sync on L1-L2 switchesJan Kiszka1-3/+6
When asking vmx to load the PAT MSR for us while switching from L1 to L2 or vice versa, we have to update arch.pat as well as it may later be used again to load or read out the MSR content. Reviewed-by: Gleb Natapov <gleb@redhat.com> Tested-by: Arthur Chunqi Li <yzt356@gmail.com> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07nEPT: Miscelleneous cleanupsNadav Har'El1-4/+2
Some trivial code cleanups not really related to nested EPT. Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Nadav Har'El <nyh@il.ibm.com> Signed-off-by: Jun Nakajima <jun.nakajima@intel.com> Signed-off-by: Xinhao Xu <xinhao.xu@intel.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07nEPT: Some additional commentsNadav Har'El1-0/+13
Some additional comments to preexisting code: Explain who (L0 or L1) handles EPT violation and misconfiguration exits. Don't mention "shadow on either EPT or shadow" as the only two options. Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Nadav Har'El <nyh@il.ibm.com> Signed-off-by: Jun Nakajima <jun.nakajima@intel.com> Signed-off-by: Xinhao Xu <xinhao.xu@intel.com> Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07Advertise the support of EPT to the L1 guest, through the appropriate MSR.Nadav Har'El1-2/+18
This is the last patch of the basic Nested EPT feature, so as to allow bisection through this patch series: The guest will not see EPT support until this last patch, and will not attempt to use the half-applied feature. Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Nadav Har'El <nyh@il.ibm.com> Signed-off-by: Jun Nakajima <jun.nakajima@intel.com> Signed-off-by: Xinhao Xu <xinhao.xu@intel.com> Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07nEPT: Nested INVEPTNadav Har'El4-0/+77
If we let L1 use EPT, we should probably also support the INVEPT instruction. In our current nested EPT implementation, when L1 changes its EPT table for L2 (i.e., EPT12), L0 modifies the shadow EPT table (EPT02), and in the course of this modification already calls INVEPT. But if last level of shadow page is unsync not all L1's changes to EPT12 are intercepted, which means roots need to be synced when L1 calls INVEPT. Global INVEPT should not be different since roots are synced by kvm_mmu_load() each time EPTP02 changes. Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Nadav Har'El <nyh@il.ibm.com> Signed-off-by: Jun Nakajima <jun.nakajima@intel.com> Signed-off-by: Xinhao Xu <xinhao.xu@intel.com> Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07nEPT: MMU context for nested EPTNadav Har'El3-1/+69
KVM's existing shadow MMU code already supports nested TDP. To use it, we need to set up a new "MMU context" for nested EPT, and create a few callbacks for it (nested_ept_*()). This context should also use the EPT versions of the page table access functions (defined in the previous patch). Then, we need to switch back and forth between this nested context and the regular MMU context when switching between L1 and L2 (when L1 runs this L2 with EPT). Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Nadav Har'El <nyh@il.ibm.com> Signed-off-by: Jun Nakajima <jun.nakajima@intel.com> Signed-off-by: Xinhao Xu <xinhao.xu@intel.com> Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07nEPT: Add nEPT violation/misconfigration supportYang Zhang4-14/+95
Inject nEPT fault to L1 guest. This patch is original from Xinhao. Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Jun Nakajima <jun.nakajima@intel.com> Signed-off-by: Xinhao Xu <xinhao.xu@intel.com> Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07nEPT: correctly check if remote tlb flush is needed for shadowed EPT tablesGleb Natapov1-4/+4
need_remote_flush() assumes that shadow page is in PT64 format, but with addition of nested EPT this is no longer always true. Fix it by bits definitions that depend on host shadow page type. Reported-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07nEPT: Redefine EPT-specific link_shadow_page()Yang Zhang2-5/+11
Since nEPT doesn't support A/D bit, so we should not set those bit when build shadow page table. Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07nEPT: Add EPT tables support to paging_tmpl.hNadav Har'El2-1/+41
This is the first patch in a series which adds nested EPT support to KVM's nested VMX. Nested EPT means emulating EPT for an L1 guest so that L1 can use EPT when running a nested guest L2. When L1 uses EPT, it allows the L2 guest to set its own cr3 and take its own page faults without either of L0 or L1 getting involved. This often significanlty improves L2's performance over the previous two alternatives (shadow page tables over EPT, and shadow page tables over shadow page tables). This patch adds EPT support to paging_tmpl.h. paging_tmpl.h contains the code for reading and writing page tables. The code for 32-bit and 64-bit tables is very similar, but not identical, so paging_tmpl.h is #include'd twice in mmu.c, once with PTTTYPE=32 and once with PTTYPE=64, and this generates the two sets of similar functions. There are subtle but important differences between the format of EPT tables and that of ordinary x86 64-bit page tables, so for nested EPT we need a third set of functions to read the guest EPT table and to write the shadow EPT table. So this patch adds third PTTYPE, PTTYPE_EPT, which creates functions (prefixed with "EPT") which correctly read and write EPT tables. Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Nadav Har'El <nyh@il.ibm.com> Signed-off-by: Jun Nakajima <jun.nakajima@intel.com> Signed-off-by: Xinhao Xu <xinhao.xu@intel.com> Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07nEPT: Support shadow paging for guest paging without A/D bitsGleb Natapov1-3/+13
Some guest paging modes do not support A/D bits. Add support for such modes in shadow page code. For such modes PT_GUEST_DIRTY_MASK, PT_GUEST_ACCESSED_MASK, PT_GUEST_DIRTY_SHIFT and PT_GUEST_ACCESSED_SHIFT should be set to zero. Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07nEPT: make guest's A/D bits depends on guest's paging modeGleb Natapov1-8/+22
This patch makes guest A/D bits definition to be dependable on paging mode, so when EPT support will be added it will be able to define them differently. Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07nEPT: Move common code to paging_tmpl.hNadav Har'El2-67/+69
For preparation, we just move gpte_access(), prefetch_invalid_gpte(), s_rsvd_bits_set(), protect_clean_gpte() and is_dirty_gpte() from mmu.c to paging_tmpl.h. Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Nadav Har'El <nyh@il.ibm.com> Signed-off-by: Jun Nakajima <jun.nakajima@intel.com> Signed-off-by: Xinhao Xu <xinhao.xu@intel.com> Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com> Signed-off-by: Jun Nakajima <jun.nakajima@intel.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07nEPT: Fix wrong test in kvm_set_cr3Nadav Har'El1-11/+0
kvm_set_cr3() attempts to check if the new cr3 is a valid guest physical address. The problem is that with nested EPT, cr3 is an *L2* physical address, not an L1 physical address as this test expects. As the comment above this test explains, it isn't necessary, and doesn't correspond to anything a real processor would do. So this patch removes it. Note that this wrong test could have also theoretically caused problems in nested NPT, not just in nested EPT. However, in practice, the problem was avoided: nested_svm_vmexit()/vmrun() do not call kvm_set_cr3 in the nested NPT case, and instead set the vmcb (and arch.cr3) directly, thus circumventing the problem. Additional potential calls to the buggy function are avoided in that we don't trap cr3 modifications when nested NPT is enabled. However, because in nested VMX we did want to use kvm_set_cr3() (as requested in Avi Kivity's review of the original nested VMX patches), we can't avoid this problem and need to fix it. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Nadav Har'El <nyh@il.ibm.com> Signed-off-by: Jun Nakajima <jun.nakajima@intel.com> Signed-off-by: Xinhao Xu <xinhao.xu@intel.com> Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07nEPT: Fix cr3 handling in nested exit and entryNadav Har'El1-0/+26
The existing code for handling cr3 and related VMCS fields during nested exit and entry wasn't correct in all cases: If L2 is allowed to control cr3 (and this is indeed the case in nested EPT), during nested exit we must copy the modified cr3 from vmcs02 to vmcs12, and we forgot to do so. This patch adds this copy. If L0 isn't controlling cr3 when running L2 (i.e., L0 is using EPT), and whoever does control cr3 (L1 or L2) is using PAE, the processor might have saved PDPTEs and we should also save them in vmcs12 (and restore later). Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Reviewed-by: Orit Wasserman <owasserm@redhat.com> Signed-off-by: Nadav Har'El <nyh@il.ibm.com> Signed-off-by: Jun Nakajima <jun.nakajima@intel.com> Signed-off-by: Xinhao Xu <xinhao.xu@intel.com> Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07nEPT: Support LOAD_IA32_EFER entry/exit controls for L1Nadav Har'El1-7/+16
Recent KVM, since http://kerneltrap.org/mailarchive/linux-kvm/2010/5/2/6261577 switch the EFER MSR when EPT is used and the host and guest have different NX bits. So if we add support for nested EPT (L1 guest using EPT to run L2) and want to be able to run recent KVM as L1, we need to allow L1 to use this EFER switching feature. To do this EFER switching, KVM uses VM_ENTRY/EXIT_LOAD_IA32_EFER if available, and if it isn't, it uses the generic VM_ENTRY/EXIT_MSR_LOAD. This patch adds support for the former (the latter is still unsupported). Nested entry and exit emulation (prepare_vmcs_02 and load_vmcs12_host_state, respectively) already handled VM_ENTRY/EXIT_LOAD_IA32_EFER correctly. So all that's left to do in this patch is to properly advertise this feature to L1. Note that vmcs12's VM_ENTRY/EXIT_LOAD_IA32_EFER are emulated by L0, by using vmx_set_efer (which itself sets one of several vmcs02 fields), so we always support this feature, regardless of whether the host supports it. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Signed-off-by: Nadav Har'El <nyh@il.ibm.com> Signed-off-by: Jun Nakajima <jun.nakajima@intel.com> Signed-off-by: Xinhao Xu <xinhao.xu@intel.com> Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07KVM: MMU: fix check the reserved bits on the gpte of L2Xiao Guangrong1-2/+1
Current code always uses arch.mmu to check the reserved bits on guest gpte which is valid only for L1 guest, we should use arch.nested_mmu instead when we translate gva to gpa for the L2 guest Fix it by using @mmu instead since it is adapted to the current mmu mode automatically The bug can be triggered when nested npt is used and L1 guest and L2 guest use different mmu mode Reported-by: Jan Kiszka <jan.kiszka@siemens.com> Reviewed-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-08-07KVM: nVMX: correctly set tr base on nested vmexit emulationGleb Natapov1-1/+1
After commit 21feb4eb64e21f8dc91136b91ee886b978ce6421 tr base is zeroed during vmexit. Set it to L1's HOST_TR_BASE. This should fix https://bugzilla.kernel.org/show_bug.cgi?id=60679 Reported-by: Yongjie Ren <yongjie.ren@intel.com> Reviewed-by: Arthur Chunqi Li <yzt356@gmail.com> Tested-by: Yongjie Ren <yongjie.ren@intel.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-07-29nVMX: reset rflags register cache during nested vmentry.Gleb Natapov1-1/+1
During nested vmentry into vm86 mode a vcpu state is found to be incorrect because rflags does not have VM flag set since it is read from the cache and has L1's value instead of L2's. If emulate_invalid_guest_state=1 L0 KVM tries to emulate it, but emulation does not work for nVMX and it never should happen anyway. Fix that by using vmx_set_rflags() to set rflags during nested vmentry which takes care of updating register cache. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-07-29KVM: s390: Make KVM_HVA_ERR_BAD usable on s390Dominik Dingel1-0/+8
Current common code uses PAGE_OFFSET to indicate a bad host virtual address. As this check won't work on architectures that don't map kernel and user memory into the same address space (e.g. s390), such architectures can now provide their own KVM_HVA_ERR_BAD defines. Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-07-29KVM: s390: Add helper function for setting condition codeThomas Huth2-9/+13
Introduced a helper function for setting the CC in the guest PSW to improve the readability of the code. Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-07-29KVM: s390: Fix sparse warnings in priv.cThomas Huth1-3/+3
sparse complained about the missing UL postfix for long constants. Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-07-29KVM: s390: declare virtual HW facilitiesMichael Mueller3-15/+22
The patch renames the array holding the HW facility bitmaps. This allows to interprete the variable as set of virtual machine specific "virtual" facilities. The basic idea is to make virtual facilities externally managable in future. An availability test for virtual facilites has been added as well. Signed-off-by: Michael Mueller <mimu@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-07-29KVM: s390: fix task size checkMartin Schwidefsky2-1/+3
The gmap_map_segment function uses PGDIR_SIZE in the check for the maximum address in the tasks address space. This incorrectly limits the amount of memory usable for a kvm guest to 4TB. The correct limit is (1UL << 53). As the TASK_SIZE has different values (4TB vs 8PB) dependent on the existance of the fourth page table level, create a new define 'TASK_MAX_SIZE' for (1UL << 53). Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-07-29KVM: s390: allow sie enablement for multi-threaded programsMartin Schwidefsky4-84/+129
Improve the code to upgrade the standard 2K page tables to 4K page tables with PGSTEs to allow the operation to happen when the program is already multi-threaded. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-07-29KVM: x86: handle singlestep during emulationPaolo Bonzini1-1/+38
This lets debugging work better during emulation of invalid guest state. This time the check is done after emulation, but before writeback of the flags; we need to check the flags *before* execution of the instruction, we cannot check singlestep_rip because the CS base may have already been modified. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Conflicts: arch/x86/kvm/x86.c
2013-07-29KVM: x86: handle hardware breakpoints during emulationPaolo Bonzini1-0/+66
This lets debugging work better during emulation of invalid guest state. The check is done before emulating the instruction, and (in the case of guest debugging) reuses EMULATE_DO_MMIO to exit with KVM_EXIT_DEBUG. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-07-29KVM: x86: rename EMULATE_DO_MMIOPaolo Bonzini4-6/+6
The next patch will reuse it for other userspace exits than MMIO, namely debug events. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-07-25KVM: x86: Drop some unused functions from lapicJan Kiszka1-10/+0
Both have no users anymore. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Gleb Natapov <gleb@redhat.com>
2013-07-25KVM: x86: Simplify __apic_accept_irqJan Kiszka1-15/+8
If posted interrupts are enabled, we can no longer track if an IRQ was coalesced based on IRR. So drop this logic also from the classic software path and simplify apic_test_and_set_irr to apic_set_irr. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Gleb Natapov <gleb@redhat.com>
2013-07-19perf, kvm: Support the in_tx/in_tx_cp modifiers in KVM arch perfmon emulation v5Andi Kleen2-5/+21
[KVM maintainers: The underlying support for this is in perf/core now. So please merge this patch into the KVM tree.] This is not arch perfmon, but older CPUs will just ignore it. This makes it possible to do at least some TSX measurements from a KVM guest v2: Various fixes to address review feedback v3: Ignore the bits when no CPUID. No #GP. Force raw events with TSX bits. v4: Use reserved bits for #GP v5: Remove obsolete argument Acked-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-07-18KVM: nVMX: Set segment infomation of L1 when L2 exitsArthur Chunqi Li1-10/+48
When L2 exits to L1, segment infomations of L1 are not set correctly. According to Intel SDM 27.5.2(Loading Host Segment and Descriptor Table Registers), segment base/limit/access right of L1 should be set to some designed value when L2 exits to L1. This patch fixes this. Signed-off-by: Arthur Chunqi Li <yzt356@gmail.com> Reviewed-by: Gleb Natapov <gnatapov@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-07-18remove sched notifier for cross-cpu migrationsMarcelo Tosatti3-53/+8
Linux as a guest on KVM hypervisor, the only user of the pvclock vsyscall interface, does not require notification on task migration because: 1. cpu ID number maps 1:1 to per-CPU pvclock time info. 2. per-CPU pvclock time info is updated if the underlying CPU changes. 3. that version is increased whenever underlying CPU changes. Which is sufficient to guarantee nanoseconds counter is calculated properly. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Gleb Natapov <gleb@redhat.com>
2013-07-18KVM: nVMX: Fix read/write to MSR_IA32_FEATURE_CONTROLNadav Har'El2-7/+31
Fix read/write to IA32_FEATURE_CONTROL MSR in nested environment. This patch simulate this MSR in nested_vmx and the default value is 0x0. BIOS should set it to 0x5 before VMXON. After setting the lock bit, write to it will cause #GP(0). Another QEMU patch is also needed to handle emulation of reset and migration. Reset to vCPU should clear this MSR and migration should reserve value of it. This patch is based on Nadav's previous commit. http://permalink.gmane.org/gmane.comp.emulators.kvm.devel/88478 Signed-off-by: Nadav Har'El <nyh@math.technion.ac.il> Signed-off-by: Arthur Chunqi Li <yzt356@gmail.com> Signed-off-by: Gleb Natapov <gleb@redhat.com>
2013-07-18KVM: x86: Drop useless castMathias Krause1-1/+1
Void pointers don't need no casting, drop it. Signed-off-by: Mathias Krause <minipli@googlemail.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Gleb Natapov <gleb@redhat.com>
2013-07-18KVM: VMX: Use proper types to access const arraysMathias Krause1-8/+7
Use a const pointer type instead of casting away the const qualifier from const arrays. Keep the pointer array on the stack, nonetheless. Making it static just increases the object size. Signed-off-by: Mathias Krause <minipli@googlemail.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Gleb Natapov <gleb@redhat.com>
2013-07-18KVM: nVMX: Set success rflags when emulate VMXON/VMXOFF in nested virtArthur Chunqi Li1-0/+2
Set rflags after successfully emulateing VMXON/VMXOFF in VMX. Signed-off-by: Arthur Chunqi Li <yzt356@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-07-18KVM: nVMX: Change location of 3 functions in vmx.cArthur Chunqi Li1-43/+40
Move nested_vmx_succeed/nested_vmx_failInvalid/nested_vmx_failValid ahead of handle_vmon to eliminate double declaration in the same file Signed-off-by: Arthur Chunqi Li <yzt356@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-07-18KVM: x86: Avoid zapping mmio sptes twice for generation wraparoundTakuya Yoshikawa2-9/+6
Now that kvm_arch_memslots_updated() catches every increment of the memslots->generation, checking if the mmio generation has reached its maximum value is enough. Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp> Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-07-18KVM: Introduce kvm_arch_memslots_updated()Takuya Yoshikawa6-0/+24
This is called right after the memslots is updated, i.e. when the result of update_memslots() gets installed in install_new_memslots(). Since the memslots needs to be updated twice when we delete or move a memslot, kvm_arch_commit_memory_region() does not correspond to this exactly. In the following patch, x86 will use this new API to check if the mmio generation has reached its maximum value, in which case mmio sptes need to be flushed out. Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp> Acked-by: Alexander Graf <agraf@suse.de> Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-07-18KVM: s390: use cookies for ioeventfdCornelia Huck1-4/+13
Make use of cookies for the virtio ccw notification hypercall to speed up lookup of devices on the io bus. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> [Small fix to a comment. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-07-18KVM: MMU: avoid fast page fault fixing mmio page faultXiao Guangrong1-0/+7
Currently, fast page fault incorrectly tries to fix mmio page fault when the generation number is invalid (spte.gen != kvm.gen). It then returns to guest to retry the fault since it sees the last spte is nonpresent. This causes an infinite loop. Since fast page fault only works for direct mmu, the issue exists when 1) tdp is enabled. It is only triggered only on AMD host since on Intel host the mmio page fault is recognized as ept-misconfig whose handler call fault-page path with error_code = 0 2) guest paging is disabled. Under this case, the issue is hardly discovered since paging disable is short-lived and the sptes will be invalid after memslot changed for 150 times Fix it by filtering out MMIO page faults in page_fault_can_be_fast. Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de> Tested-by: Markus Trippelsdorf <markus@trippelsdorf.de> Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-07-14Merge branch 'for-linus' of ↵Linus Torvalds3-3/+3
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull more vfs stuff from Al Viro: "O_TMPFILE ABI changes, Oleg's fput() series, misc cleanups, including making simple_lookup() usable for filesystems with non-NULL s_d_op, which allows us to get rid of quite a bit of ugliness" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: sunrpc: now we can just set ->s_d_op cgroup: we can use simple_lookup() now efivarfs: we can use simple_lookup() now make simple_lookup() usable for filesystems that set ->s_d_op configfs: don't open-code d_alloc_name() __rpc_lookup_create_exclusive: pass string instead of qstr rpc_create_*_dir: don't bother with qstr llist: llist_add() can use llist_add_batch() llist: fix/simplify llist_add() and llist_add_batch() fput: turn "list_head delayed_fput_list" into llist_head fs/file_table.c:fput(): add comment Safer ABI for O_TMPFILE
2013-07-14Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netLinus Torvalds14-14/+14
Pull networking fixes from David Miller: "Just a bunch of small fixes and tidy ups: 1) Finish the "busy_poll" renames, from Eliezer Tamir. 2) Fix RCU stalls in IFB driver, from Ding Tianhong. 3) Linearize buffers properly in tun/macvtap zerocopy code. 4) Don't crash on rmmod in vxlan, from Pravin B Shelar. 5) Spinlock used before init in alx driver, from Maarten Lankhorst. 6) A sparse warning fix in bnx2x broke TSO checksums, fix from Dmitry Kravkov. 7) Dummy and ifb driver load failure paths can oops, fixes from Tan Xiaojun and Ding Tianhong. 8) Correct MTU calculations in IP tunnels, from Alexander Duyck. 9) Account all TCP retransmits in SNMP stats properly, from Yuchung Cheng. 10) atl1e and via-rhine do not handle DMA mapping failures properly, from Neil Horman. 11) Various equal-cost multipath route fixes in ipv6 from Hannes Frederic Sowa" * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (36 commits) ipv6: only static routes qualify for equal cost multipathing via-rhine: fix dma mapping errors atl1e: fix dma mapping warnings tcp: account all retransmit failures usb/net/r815x: fix cast to restricted __le32 usb/net/r8152: fix integer overflow in expression net: access page->private by using page_private net: strict_strtoul is obsolete, use kstrtoul instead drivers/net/ieee802154: don't use devm_pinctrl_get_select_default() in probe drivers/net/ethernet/cadence: don't use devm_pinctrl_get_select_default() in probe drivers/net/can/c_can: don't use devm_pinctrl_get_select_default() in probe net/usb: add relative mii functions for r815x net/tipc: use %*phC to dump small buffers in hex form qlcnic: Adding Maintainers. gre: Fix MTU sizing check for gretap tunnels pkt_sched: sch_qfq: remove forward declaration of qfq_update_agg_ts pkt_sched: sch_qfq: improve efficiency of make_eligible gso: Update tunnel segmentation to support Tx checksum offload inet: fix spacing in assignment ifb: fix oops when loading the ifb failed ...
2013-07-14Merge branch 'perf-urgent-for-linus' of ↵Linus Torvalds2-9/+10
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull perf fixes from Thomas Gleixner: - fix for do_div() abuse on x86 - locking fix in perf core - a pile of (build) fixes and cleanups in perf tools * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (27 commits) perf/x86: Fix incorrect use of do_div() in NMI warning perf: Fix perf_lock_task_context() vs RCU perf: Remove WARN_ON_ONCE() check in __perf_event_enable() for valid scenario perf: Clone child context from parent context pmu perf script: Fix broken include in Context.xs perf tools: Fix -ldw/-lelf link test when static linking perf tools: Revert regression in configuration of Python support perf tools: Fix perf version generation perf stat: Fix per-socket output bug for uncore events perf symbols: Fix vdso list searching perf evsel: Fix missing increment in sample parsing perf tools: Update symbol_conf.nr_events when processing attribute events perf tools: Fix new_term() missing free on error path perf tools: Fix parse_events_terms() segfault on error path perf evsel: Fix count parameter to read call in event_format__new perf tools: fix a typo of a Power7 event name perf tools: Fix -x/--exclude-other option for report command perf evlist: Enhance perf_evlist__start_workload() perf record: Remove -f/--force option perf record: Remove -A/--append option ...
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