- 25 Feb, 2022 20 commits
-
-
Paolo Bonzini authored
Right now, PGD caching avoids placing a PAE root in the cache by using the old value of mmu->root_level and mmu->shadow_root_level; it does not look for a cached PGD if the old root is a PAE one, and then frees it using kvm_mmu_free_roots. Change the logic instead to free the uncacheable root early. This way, __kvm_new_mmu_pgd is able to look up the cache when going from 32-bit to 64-bit (if there is a hit, the invalid root becomes the least recently used). An example of this is nested virtualization with shadow paging, when a 64-bit L1 runs a 32-bit L2. As a side effect (which is actually the reason why this patch was written), PGD caching does not use the old value of mmu->root_level and mmu->shadow_root_level anymore. Reviewed-by:
Sean Christopherson <seanjc@google.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
-
Paolo Bonzini authored
These functions only operate on a given MMU, of which there is more than one in a vCPU (we care about two, because the third does not have any roots and is only used to walk guest page tables). They do need a struct kvm in order to lock the mmu_lock, but they do not needed anything else in the struct kvm_vcpu. So, pass the vcpu->kvm directly to them. Signed-off-by: -
Paolo Bonzini authored
Right now, PGD caching requires a complicated dance of first computing the MMU role and passing it to __kvm_mmu_new_pgd(), and then separately calling kvm_init_mmu(). Part of this is due to kvm_mmu_free_roots using mmu->root_level and mmu->shadow_root_level to distinguish whether the page table uses a single root or 4 PAE roots. Because kvm_init_mmu() can overwrite mmu->root_level, kvm_mmu_free_roots() must be called before kvm_init_mmu(). However, even after kvm_init_mmu() there is a way to detect whether the page table may hold PAE roots, as root.hpa isn't backed by a shadow when it points at PAE roots. Using this method results in simpler code, and is one less obstacle in moving all calls to __kvm_mmu_new_pgd() after the MMU has been initialized. Signed-off-by: -
Paolo Bonzini authored
The root_hpa and root_pgd fields form essentially a struct kvm_mmu_root_info. Use the struct to have more consistency between mmu->root and mmu->prev_roots. The patch is entirely search and replace except for cached_root_available, which does not need a temporary struct kvm_mmu_root_info anymore. Reviewed-by:
-
Paolo Bonzini authored
WARN and bail if KVM attempts to free a root that isn't backed by a shadow page. KVM allocates a bare page for "special" roots, e.g. when using PAE paging or shadowing 2/3/4-level page tables with 4/5-level, and so root_hpa will be valid but won't be backed by a shadow page. It's all too easy to blindly call mmu_free_root_page() on root_hpa, be nice and WARN instead of crashing KVM and possibly the kernel. Reviewed-by:
-
Paolo Bonzini authored
Enabling async page faults is nonsensical if paging is disabled, but it is allowed because CR0.PG=0 does not clear the async page fault MSR. Just ignore them and only use the artificial halt state, similar to what happens in guest mode if async #PF vmexits are disabled. Given the increasingly complex logic, and the nicer code if the new "if" is placed last, opportunistically change the "||" into a chain of "if (...) return false" statements. Reviewed-by:
-
Paolo Bonzini authored
While the guest runs, EFER.LME cannot change unless CR0.PG is clear, and therefore EFER.NX is the only bit that can affect the MMU role. However, set_efer accepts a host-initiated change to EFER.LME even with CR0.PG=1. In that case, the MMU has to be reset. Fixes: 11988499 ("KVM: x86: Skip EFER vs. guest CPUID checks for host-initiated writes") Cc: stable@vger.kernel.org Reviewed-by:
-
David Dunn authored
On a VM with PMU disabled via KVM_CAP_PMU_CONFIG, the PMU should not be usable by the guest. Signed-off-by:
David Dunn <daviddunn@google.com> Message-Id: <20220223225743.2703915-4-daviddunn@google.com> Signed-off-by:
-
David Dunn authored
Carve out portion of vm_create_default so that selftests can modify a "default" VM prior to creating vcpus. Signed-off-by:
-
David Dunn authored
Add a new capability, KVM_CAP_PMU_CAPABILITY, that takes a bitmask of settings/features to allow userspace to configure PMU virtualization on a per-VM basis. For now, support a single flag, KVM_PMU_CAP_DISABLE, to allow disabling PMU virtualization for a VM even when KVM is configured with enable_pmu=true a module level. To keep KVM simple, disallow changing VM's PMU configuration after vCPUs have been created. Signed-off-by:
-
Sean Christopherson authored
Cast kvm_x86_ops.func to 'void *' when updating KVM static calls that are conditionally patched to __static_call_return0(). clang complains about using mismatching pointers in the ternary operator, which breaks the build when compiling with CONFIG_KVM_WERROR=y. >> arch/x86/include/asm/kvm-x86-ops.h:82:1: warning: pointer type mismatch ('bool (*)(struct kvm_vcpu *)' and 'void *') [-Wpointer-type-mismatch] Fixes: 5be2226f ("KVM: x86: allow defining return-0 static calls") Reported-by:Like Xu <like.xu.linux@gmail.com> Reported-by:
kernel test robot <lkp@intel.com> Signed-off-by:
Nathan Chancellor <nathan@kernel.org> Tested-by:
-
Vipin Sharma authored
VM worker kthreads can linger in the VM process's cgroup for sometime after KVM terminates the VM process. KVM terminates the worker kthreads by calling kthread_stop() which waits on the 'exited' completion, triggered by exit_mm(), via mm_release(), in do_exit() during the kthread's exit. However, these kthreads are removed from the cgroup using the cgroup_exit() which happens after the exit_mm(). Therefore, A VM process can terminate in between the exit_mm() and cgroup_exit() calls, leaving only worker kthreads in the cgroup. Moving worker kthreads back to the original cgroup (kthreadd_task's cgroup) makes sure that the cgroup is empty as soon as the main VM process is terminated. Signed-off-by:
Vipin Sharma <vipinsh@google.com> Suggested-by:
-
Peng Hao authored
From: Peng Hao <flyingpeng@tencent.com> Remove a redundant 'cpu' declaration from inside an if-statement that that shadows an identical declaration at function scope. Both variables are used as scratch variables in for_each_*_cpu() loops, thus there's no harm in sharing a variable. Reviewed-by:
Peng Hao <flyingpeng@tencent.com> Message-Id: <20220222103954.70062-1-flyingpeng@tencent.com> Signed-off-by:
-
Peng Hao authored
Fix a comment documenting the memory barrier related to clearing a loaded_vmcs; loaded_vmcs tracks the host CPU the VMCS is loaded on via the field 'cpu', it doesn't have a 'vcpu' field. Reviewed-by:
-
Peng Hao authored
Make sure nested_vmx_hardware_setup/unsetup() are called in pairs under the same conditions. Calling nested_vmx_hardware_unsetup() when nested is false "works" right now because it only calls free_page() on zero- initialized pointers, but it's possible that more code will be added to nested_vmx_hardware_unsetup() in the future. Reviewed-by:
-
Paolo Bonzini authored
The fixes for 5.17 conflict with cleanups made in the same area earlier in the 5.18 development cycle.
-
Vitaly Kuznetsov authored
It has been proven on practice that at least Windows Server 2019 tries using HVCALL_SEND_IPI_EX in 'XMM fast' mode when it has more than 64 vCPUs and it needs to send an IPI to a vCPU > 63. Similarly to other XMM Fast hypercalls (HVCALL_FLUSH_VIRTUAL_ADDRESS_{LIST,SPACE}{,_EX}), this information is missing in TLFS as of 6.0b. Currently, KVM returns an error (HV_STATUS_INVALID_HYPERCALL_INPUT) and Windows crashes. Note, HVCALL_SEND_IPI is a 'standard' fast hypercall (not 'XMM fast') as all its parameters fit into RDX:R8 and this is handled by KVM correctly. Cc: stable@vger.kernel.org # 5.14.x: 3244867a: KVM: x86: Ignore sparse banks size for an "all CPUs", non-sparse IPI req Cc: stable@vger.kernel.org # 5.14.x Fixes: d8f5537a ("KVM: hyper-v: Advertise support for fast XMM hypercalls") Signed-off-by:Vitaly Kuznetsov <vkuznets@redhat.com> Message-Id: <20220222154642.684285-5-vkuznets@redhat.com> Signed-off-by:
-
Vitaly Kuznetsov authored
When TLB flush hypercalls (HVCALL_FLUSH_VIRTUAL_ADDRESS_{LIST,SPACE}_EX are issued in 'XMM fast' mode, the maximum number of allowed sparse_banks is not 'HV_HYPERCALL_MAX_XMM_REGISTERS - 1' (5) but twice as many (10) as each XMM register is 128 bit long and can hold two 64 bit long banks. Cc: stable@vger.kernel.org # 5.14.x Fixes: 5974565b ("KVM: x86: kvm_hv_flush_tlb use inputs from XMM registers") Signed-off-by: -
Vitaly Kuznetsov authored
'struct kvm_hv_hcall' has all the required information already, there's no need to pass 'ex' additionally. No functional change intended. Cc: stable@vger.kernel.org # 5.14.x Signed-off-by:
-
Vitaly Kuznetsov authored
'struct kvm_hv_hcall' has all the required information already, there's no need to pass 'ex' additionally. No functional change intended. Cc: stable@vger.kernel.org # 5.14.x Signed-off-by:
-
- 24 Feb, 2022 1 commit
-
-
Paolo Bonzini authored
-
- 22 Feb, 2022 4 commits
-
-
Paolo Bonzini authored
Merge tag 'kvm-s390-next-5.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD KVM: s390: Changes for 5.18 part1 - add Claudio as Maintainer - first step to do proper storage key checking - testcase for missing memop check
-
Nicholas Piggin authored
Add KVM_CAP_PPC_AIL_MODE_3 to advertise the capability to set the AIL resource mode to 3 with the H_SET_MODE hypercall. This capability differs between processor types and KVM types (PR, HV, Nested HV), and affects guest-visible behaviour. QEMU will implement a cap-ail-mode-3 to control this behaviour[1], and use the KVM CAP if available to determine KVM support[2]. Reviewed-by:
Fabiano Rosas <farosas@linux.ibm.com> Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
-
Janis Schoetterl-Glausch authored
Check that size is not zero, preventing the following warning: WARNING: CPU: 0 PID: 9692 at mm/vmalloc.c:3059 __vmalloc_node_range+0x528/0x648 Modules linked in: CPU: 0 PID: 9692 Comm: memop Not tainted 5.17.0-rc3-e4+ #80 Hardware name: IBM 8561 T01 701 (LPAR) Krnl PSW : 0704c00180000000 0000000082dc584c (__vmalloc_node_range+0x52c/0x648) R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3 Krnl GPRS: 0000000000000083 ffffffffffffffff 0000000000000000 0000000000000001 0000038000000000 000003ff80000000 0000000000000cc0 000000008ebb8000 0000000087a8a700 000000004040aeb1 000003ffd9f7dec8 000000008ebb8000 000000009d9b8000 000000000102a1b4 00000380035afb68 00000380035afaa8 Krnl Code: 0000000082dc583e: d028a7f4ff80 trtr 2036(41,%r10),3968(%r15) 0000000082dc5844: af000000 mc 0,0 #0000000082dc5848: af000000 mc 0,0 >0000000082dc584c: a7d90000 lghi %r13,0 0000000082dc5850: b904002d lgr %r2,%r13 0000000082dc5854: eb6ff1080004 lmg %r6,%r15,264(%r15) 0000000082dc585a: 07fe bcr 15,%r14 0000000082dc585c: 47000700 bc 0,1792 Call Trace: [<0000000082dc584c>] __vmalloc_node_range+0x52c/0x648 [<0000000082dc5b62>] vmalloc+0x5a/0x68 [<000003ff8067f4ca>] kvm_arch_vm_ioctl+0x2da/0x2a30 [kvm] [<000003ff806705bc>] kvm_vm_ioctl+0x4ec/0x978 [kvm] [<0000000082e562fe>] __s390x_sys_ioctl+0xbe/0x100 [<000000008360a9bc>] __do_syscall+0x1d4/0x200 [<0000000083618bd2>] system_call+0x82/0xb0 Last Breaking-Event-Address: [<0000000082dc5348>] __vmalloc_node_range+0x28/0x648 Other than the warning, there is no ill effect from the missing check, the condition is detected by subsequent code and causes a return with ENOMEM. Fixes: ef11c946 (KVM: s390: Add vm IOCTL for key checked guest absolute memory access) Signed-off-by:Janis Schoetterl-Glausch <scgl@linux.ibm.com> Link: https://lore.kernel.org/r/20220221163237.4122868-1-scgl@linux.ibm.comSigned-off-by:
Christian Borntraeger <borntraeger@linux.ibm.com>
-
Janis Schoetterl-Glausch authored
Clarify that the key argument represents the access key, not the whole storage key. Signed-off-by:
-
- 18 Feb, 2022 9 commits
-
-
Sean Christopherson authored
Remove mmu_audit.c and all its collateral, the auditing code has suffered severe bitrot, ironically partly due to shadow paging being more stable and thus not benefiting as much from auditing, but mostly due to TDP supplanting shadow paging for non-nested guests and shadowing of nested TDP not heavily stressing the logic that is being audited. Signed-off-by:
-
Paolo Bonzini authored
A few vendor callbacks are only used by VMX, but they return an integer or bool value. Introduce KVM_X86_OP_OPTIONAL_RET0 for them: if a func is NULL in struct kvm_x86_ops, it will be changed to __static_call_return0 when updating static calls. Reviewed-by:
-
Paolo Bonzini authored
All their invocations are conditional on vcpu->arch.apicv_active, meaning that they need not be implemented by vendor code: even though at the moment both vendors implement APIC virtualization, all of them can be optional. In fact SVM does not need many of them, and their implementation can be deleted now. Reviewed-by:
-
Paolo Bonzini authored
Use the newly corrected KVM_X86_OP annotations to warn about possible NULL pointer dereferences as soon as the vendor module is loaded. Reviewed-by:
-
Paolo Bonzini authored
The original use of KVM_X86_OP_NULL, which was to mark calls that do not follow a specific naming convention, is not in use anymore. Instead, let's mark calls that are optional because they are always invoked within conditionals or with static_call_cond. Those that are _not_, i.e. those that are defined with KVM_X86_OP, must be defined by both vendor modules or some kind of NULL pointer dereference is bound to happen at runtime. Reviewed-by:
-
Paolo Bonzini authored
SVM implements neither update_emulated_instruction nor set_apic_access_page_addr. Remove an "if" by calling them with static_call_cond(). Reviewed-by:
-
Paolo Bonzini authored
The two ioctls used to implement userspace-accelerated TPR, KVM_TPR_ACCESS_REPORTING and KVM_SET_VAPIC_ADDR, are available even if hardware-accelerated TPR can be used. So there is no reason not to report KVM_CAP_VAPIC. Reviewed-by:
-
Paolo Bonzini authored
I managed to get hold of a machine that has SEV but not SEV-ES, and sev_migrate_tests fails because sev_vm_create(true) returns ENOTTY. Fix this, and while at it also return KSFT_SKIP on machines that do not have SEV at all, instead of returning 0. Signed-off-by: -
Peter Gonda authored
For SEV-ES VMs with mirrors to be intra-host migrated they need to be able to migrate with the mirror. This is due to that fact that all VMSAs need to be added into the VM with LAUNCH_UPDATE_VMSA before lAUNCH_FINISH. Allowing migration with mirrors allows users of SEV-ES to keep the mirror VMs VMSAs during migration. Adds a list of mirror VMs for the original VM iterate through during its migration. During the iteration the owner pointers can be updated from the source to the destination. This fixes the ASID leaking issue which caused the blocking of migration of VMs with mirrors. Signed-off-by:
Peter Gonda <pgonda@google.com> Cc: Sean Christopherson <seanjc@google.com> Cc: Marc Orr <marcorr@google.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Message-Id: <20220211193634.3183388-1-pgonda@google.com> Signed-off-by:
-
- 15 Feb, 2022 1 commit
-
-
Thomas Huth authored
Commit 2c212e1b ("KVM: s390: Return error on SIDA memop on normal guest") fixed the behavior of the SIDA memops for normal guests. It would be nice to have a way to test whether the current kernel has the fix applied or not. Thus add a check to the KVM selftests for these two memops. Signed-off-by:
Thomas Huth <thuth@redhat.com> Reviewed-by:
Claudio Imbrenda <imbrenda@linux.ibm.com> Reviewed-by:
Shuah Khan <skhan@linuxfoundation.org> Link: https://lore.kernel.org/r/20220215074824.188440-1-thuth@redhat.comSigned-off-by:
-
- 14 Feb, 2022 5 commits
-
-
Janis Schoetterl-Glausch authored
Document all currently existing operations, flags and explain under which circumstances they are available. Document the recently introduced absolute operations and the storage key protection flag, as well as the existing SIDA operations. Signed-off-by:
Janosch Frank <frankja@linux.ibm.com> Link: https://lore.kernel.org/r/20220211182215.2730017-10-scgl@linux.ibm.comSigned-off-by:
-
Janis Schoetterl-Glausch authored
Availability of the KVM_CAP_S390_MEM_OP_EXTENSION capability signals that: * The vcpu MEM_OP IOCTL supports storage key checking. * The vm MEM_OP IOCTL exists. Signed-off-by:
-
Janis Schoetterl-Glausch authored
Makes the naming consistent, now that we also have a vm ioctl. Signed-off-by:
-
Janis Schoetterl-Glausch authored
Channel I/O honors storage keys and is performed on absolute memory. For I/O emulation user space therefore needs to be able to do key checked accesses. The vm IOCTL supports read/write accesses, as well as checking if an access would succeed. Unlike relying on KVM_S390_GET_SKEYS for key checking would, the vm IOCTL performs the check in lockstep with the read or write, by, ultimately, mapping the access to move instructions that support key protection checking with a supplied key. Fetch and storage protection override are not applicable to absolute accesses and so are not applied as they are when using the vcpu memop. Signed-off-by:
-
Janis Schoetterl-Glausch authored
User space needs a mechanism to perform key checked accesses when emulating instructions. The key can be passed as an additional argument. Having an additional argument is flexible, as user space can pass the guest PSW's key, in order to make an access the same way the CPU would, or pass another key if necessary. Signed-off-by:
-
