- 28 Nov, 2022 7 commits
-
-
Chang S. Bae authored
Latest Intel platform Granite Rapids has introduced a new instruction - AMX-FP16, which performs dot-products of two FP16 tiles and accumulates the results into a packed single precision tile. AMX-FP16 adds FP16 capability and also allows a FP16 GPU trained model to run faster without loss of accuracy or added SW overhead. The bit definition: CPUID.(EAX=7,ECX=1):EAX[bit 21] AMX-FP16 is on an expected-dense CPUID leaf and some other bits on this leaf have kernel usages. Given that, define this feature bit like X86_FEATURE_<name> in kernel. Considering AMX-FP16 itself has no truly kernel usages and /proc/cpuinfo has too much unreadable flags, hide this one in /proc/cpuinfo. Advertise AMX-FP16 to KVM userspace. This is safe because there are no new VMX controls or additional host enabling required for guests to use this feature. Signed-off-by:
Chang S. Bae <chang.seok.bae@intel.com> Signed-off-by:
Jiaxi Chen <jiaxi.chen@linux.intel.com> Acked-by:
Borislav Petkov <bp@suse.de> Message-Id: <20221125125845.1182922-5-jiaxi.chen@linux.intel.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
-
Jiaxi Chen authored
CMPccXADD is a new set of instructions in the latest Intel platform Sierra Forest. This new instruction set includes a semaphore operation that can compare and add the operands if condition is met, which can improve database performance. The bit definition: CPUID.(EAX=7,ECX=1):EAX[bit 7] CMPccXADD is on an expected-dense CPUID leaf and some other bits on this leaf have kernel usages. Given that, define this feature bit like X86_FEATURE_<name> in kernel. Considering CMPccXADD itself has no truly kernel usages and /proc/cpuinfo has too much unreadable flags, hide this one in /proc/cpuinfo. Advertise CMPCCXADD to KVM userspace. This is safe because there are no new VMX controls or additional host enabling required for guests to use this feature. Signed-off-by:
-
Sean Christopherson authored
Rename kvm_cpu_cap_init_scattered() to kvm_cpu_cap_init_kvm_defined() in anticipation of adding KVM-only CPUID leafs that aren't recognized by the kernel and thus not scattered, i.e. for leafs that are 100% KVM-defined. Adjust/add comments to kvm_only_cpuid_leafs and KVM_X86_FEATURE to document how to create new kvm_only_cpuid_leafs entries for scattered features as well as features that are entirely unknown to the kernel. No functional change intended. Signed-off-by:
Sean Christopherson <seanjc@google.com> Message-Id: <20221125125845.1182922-3-jiaxi.chen@linux.intel.com> Signed-off-by:
-
Sean Christopherson authored
Add a compile-time assert in the SF() macro to detect improper usage, i.e. to detect passing in an X86_FEATURE_* flag that isn't actually scattered by the kernel. Upcoming feature flags will be 100% KVM-only and will have X86_FEATURE_* macros that point at a kvm_only_cpuid_leafs word, not a kernel-defined word. Using SF() and thus boot_cpu_has() for such feature flags would access memory beyond x86_capability[NCAPINTS] and at best incorrectly hide a feature, and at worst leak kernel state to userspace. Signed-off-by:
-
David Woodhouse authored
Adding Paul as co-maintainer of Xen support to help ensure that things don't fall through the cracks when I spend three months at a time travelling... Signed-off-by:
David Woodhouse <dwmw@amazon.co.uk> Reviewed-by:
Paul Durrant <paul@xen.org> Signed-off-by:
-
David Woodhouse authored
Signed-off-by:
-
Paolo Bonzini authored
Architecture code might want to use it even if CONFIG_HAVE_KVM_IRQ_ROUTING is false; for example PPC XICS has KVM_IRQ_LINE and wants to use kvm_arch_irqchip_in_kernel from there, but it does not have KVM_SET_GSI_ROUTING so the prototype was not provided. Fixes: d663b8a2 ("KVM: replace direct irq.h inclusion") Reported-by:
kernel test robot <lkp@intel.com> Signed-off-by:
-
- 24 Nov, 2022 1 commit
-
-
Paolo Bonzini authored
This brings in a few important fixes for Xen emulation. While nobody should be enabling it, the bug effectively allows userspace to read arbitrary memory. Signed-off-by:
-
- 23 Nov, 2022 3 commits
-
-
David Woodhouse authored
In the case where a GPC is refreshed to a different location within the same page, we didn't bother to update it. Mostly we don't need to, but since the ->khva field also includes the offset within the page, that does have to be updated. Fixes: 3ba2c95e ("KVM: Do not incorporate page offset into gfn=>pfn cache user address") Signed-off-by:
-
David Woodhouse authored
There are almost no hypercalls which are valid from CPL > 0, and definitely none which are handled by the kernel. Fixes: 2fd6df2f ("KVM: x86/xen: intercept EVTCHNOP_send from guests") Reported-by:
Michal Luczaj <mhal@rbox.co> Signed-off-by:
-
David Woodhouse authored
We shouldn't allow guests to poll on arbitrary port numbers off the end of the event channel table. Fixes: 1a65105a ("KVM: x86/xen: handle PV spinlocks slowpath") [dwmw2: my bug though; the original version did check the validity as a side-effect of an idr_find() which I ripped out in refactoring.] Reported-by:
-
- 21 Nov, 2022 12 commits
-
-
Vitaly Kuznetsov authored
Conform to the rest of Hyper-V emulation selftests which have 'hyperv' prefix. Get rid of '_test' suffix as well as the purpose of this code is fairly obvious. Reviewed-by:
Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by:
-
Vitaly Kuznetsov authored
Enable Hyper-V L2 TLB flush and check that Hyper-V TLB flush hypercalls from L2 don't exit to L1 unless 'TlbLockCount' is set in the Partition assist page. Signed-off-by:
-
Vitaly Kuznetsov authored
Enable Hyper-V L2 TLB flush and check that Hyper-V TLB flush hypercalls from L2 don't exit to L1 unless 'TlbLockCount' is set in the Partition assist page. Signed-off-by:
-
Vitaly Kuznetsov authored
Hyper-V MSR-Bitmap tests do RDMSR from L2 to exit to L1. While 'evmcs_test' correctly clobbers all GPRs (which are not preserved), 'hyperv_svm_test' does not. Introduce a more generic rdmsr_from_l2() to avoid code duplication and remove hardcoding of MSRs. Do not put it in common code because it is really just a selftests bug rather than a processor feature that requires it. Signed-off-by:
-
Vitaly Kuznetsov authored
vmmcall()/vmcall() are used to exit from L2 to L1 and no concrete hypercall ABI is currenty followed. With the introduction of Hyper-V L2 TLB flush it becomes (theoretically) possible that L0 will take responsibility for handling the call and no L1 exit will happen. Prevent this by stuffing RAX (KVM ABI) and RCX (Hyper-V ABI) with 'safe' values. While on it, convert vmmcall() to 'static inline', make it setup stack frame and move to include/x86_64/svm_util.h. Signed-off-by:
-
Vitaly Kuznetsov authored
In preparation to testing Hyper-V L2 TLB flush hypercalls, allocate so-called Partition assist page. Reviewed-by:
-
Vitaly Kuznetsov authored
There's no need to pollute VMX and SVM code with Hyper-V specific stuff and allocate Hyper-V specific test pages for all test as only few really need them. Create a dedicated struct and an allocation helper. Reviewed-by:
-
Vitaly Kuznetsov authored
In preparation to putting Hyper-V specific test pages to a dedicated struct, move eVMCS load logic from load_vmcs(). Tests call load_vmcs() directly and the only one which needs 'enlightened' version is evmcs_test so there's not much gain in having this merged. Temporary pass both GPA and HVA to load_evmcs(). Reviewed-by:
-
Vitaly Kuznetsov authored
Hyper-V VP assist page is not eVMCS specific, it is also used for enlightened nSVM. Move the code to vendor neutral place. Reviewed-by:
Maxim Levitsky <mlevitsk@redhat.com> Reviewed-by:
-
Vitaly Kuznetsov authored
'struct hv_vp_assist_page' definition doesn't match TLFS. Also, define 'struct hv_nested_enlightenments_control' and use it instead of opaque '__u64'. Reviewed-by:
-
Vitaly Kuznetsov authored
'struct hv_enlightened_vmcs' definition in selftests is not '__packed' and so we rely on the compiler doing the right padding. This is not obvious so it seems beneficial to use the same definition as in kernel. Reviewed-by:
-
Vitaly Kuznetsov authored
Introduce a selftest for Hyper-V PV TLB flush hypercalls (HvFlushVirtualAddressSpace/HvFlushVirtualAddressSpaceEx, HvFlushVirtualAddressList/HvFlushVirtualAddressListEx). The test creates one 'sender' vCPU and two 'worker' vCPU which do busy loop reading from a certain GVA checking the observed value. Sender vCPU swaos the data page with another page filled with a different value. The expectation for workers is also altered. Without TLB flush on worker vCPUs, they may continue to observe old value. To guard against accidental TLB flushes for worker vCPUs the test is repeated 100 times. Hyper-V TLB flush hypercalls are tested in both 'normal' and 'XMM fast' modes. Reviewed-by:
-
- 18 Nov, 2022 17 commits
-
-
Vitaly Kuznetsov authored
Currently, tests can only request a new vaddr range by using vm_vaddr_alloc()/vm_vaddr_alloc_page()/vm_vaddr_alloc_pages() but these functions allocate and map physical pages too. Make it possible to request unmapped range too. Reviewed-by:
-
Vitaly Kuznetsov authored
Similar to vm_vaddr_alloc(), virt_map() needs to reflect the mapping in vm->vpages_mapped. While on it, remove unneeded code wrapping in vm_vaddr_alloc(). Reviewed-by:
Andrew Jones <andrew.jones@linux.dev> Reviewed-by:
-
Vitaly Kuznetsov authored
Introduce a selftest for Hyper-V PV IPI hypercalls (HvCallSendSyntheticClusterIpi, HvCallSendSyntheticClusterIpiEx). The test creates one 'sender' vCPU and two 'receiver' vCPU and then issues various combinations of send IPI hypercalls in both 'normal' and 'fast' (with XMM input where necessary) mode. Later, the test checks whether IPIs were delivered to the expected destination vCPU[s]. Reviewed-by:
-
Vitaly Kuznetsov authored
All Hyper-V specific tests issuing hypercalls need this. Reviewed-by:
-
Vitaly Kuznetsov authored
HYPERV_LINUX_OS_ID needs to be written to HV_X64_MSR_GUEST_OS_ID by each Hyper-V specific selftest. Reviewed-by:
-
Vitaly Kuznetsov authored
set_xmm()/get_xmm() helpers are fairly useless as they only read 64 bits from 128-bit registers. Moreover, these helpers are not used. Borrow _kvm_read_sse_reg()/_kvm_write_sse_reg() from KVM limiting them to XMM0-XMM8 for now. Reviewed-by:
-
Vitaly Kuznetsov authored
With both nSVM and nVMX implementations in place, KVM can now expose Hyper-V L2 TLB flush feature to userspace. Reviewed-by:
-
Vitaly Kuznetsov authored
Implement Hyper-V L2 TLB flush for nSVM. The feature needs to be enabled both in extended 'nested controls' in VMCB and VP assist page. According to Hyper-V TLFS, synthetic vmexit to L1 is performed with - HV_SVM_EXITCODE_ENL exit_code. - HV_SVM_ENL_EXITCODE_TRAP_AFTER_FLUSH exit_info_1. Note: VP assist page is cached in 'struct kvm_vcpu_hv' so recalc_intercepts() doesn't need to read from guest's memory. KVM needs to update the case upon each VMRUN and after svm_set_nested_state (svm_get_nested_state_pages()) to handle the case when the guest got migrated while L2 was running. Reviewed-by:
-
Vitaly Kuznetsov authored
Convert kvm_hv_get_assist_page() to return 'int' and propagate possible errors from kvm_read_guest_cached(). Suggested-by:
-
Vitaly Kuznetsov authored
Enable L2 TLB flush feature on nVMX when: - Enlightened VMCS is in use. - The feature flag is enabled in eVMCS. - The feature flag is enabled in partition assist page. Perform synthetic vmexit to L1 after processing TLB flush call upon request (HV_VMX_SYNTHETIC_EXIT_REASON_TRAP_AFTER_FLUSH). Note: nested_evmcs_l2_tlb_flush_enabled() uses cached VP assist page copy which gets updated from nested_vmx_handle_enlightened_vmptrld(). This is also guaranteed to happen post migration with eVMCS backed L2 running. Reviewed-by:
-
Vitaly Kuznetsov authored
In preparation to enabling L2 TLB flush, cache VP assist page in 'struct kvm_vcpu_hv'. While on it, rename nested_enlightened_vmentry() to nested_get_evmptr() and make it return eVMCS GPA directly. No functional change intended. Reviewed-by:
-
Vitaly Kuznetsov authored
Introduce a helper to quickly check if KVM needs to handle VMCALL/VMMCALL from L2 in L0 to process L2 TLB flush requests. Reviewed-by:
-
Vitaly Kuznetsov authored
Handle L2 TLB flush requests by going through all vCPUs and checking whether there are vCPUs running the same VM_ID with a VP_ID specified in the requests. Perform synthetic exit to L2 upon finish. Note, while checking VM_ID/VP_ID of running vCPUs seem to be a bit racy, we count on the fact that KVM flushes the whole L2 VPID upon transition. Also, KVM_REQ_HV_TLB_FLUSH request needs to be done upon transition between L1 and L2 to make sure all pending requests are always processed. For the reference, Hyper-V TLFS refers to the feature as "Direct Virtual Flush". Note, nVMX/nSVM code does not handle VMCALL/VMMCALL from L2 yet. Reviewed-by:
-
Vitaly Kuznetsov authored
The newly introduced helper checks whether vCPU is performing a Hyper-V TLB flush hypercall. This is required to filter out L2 TLB flush hypercalls for processing. Reviewed-by:
-
Vitaly Kuznetsov authored
Hyper-V supports injecting synthetic L2->L1 exit after performing L2 TLB flush operation but the procedure is vendor specific. Introduce .hv_inject_synthetic_vmexit_post_tlb_flush nested hook for it. Reviewed-by:
-
Vitaly Kuznetsov authored
Similar to nSVM, KVM needs to know L2's VM_ID/VP_ID and Partition assist page address to handle L2 TLB flush requests. Reviewed-by:
-
Vitaly Kuznetsov authored
To handle L2 TLB flush requests, KVM needs to keep track of L2's VM_ID/ VP_IDs which are set by L1 hypervisor. 'Partition assist page' address is also needed to handle post-flush exit to L1 upon request. Reviewed-by:
-
