- 21 Dec, 2018 31 commits
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Luwei Kang authored
Currently, Intel Processor Trace do not support tracing in L1 guest VMX operation(IA32_VMX_MISC[bit 14] is 0). As mentioned in SDM, on these type of processors, execution of the VMXON instruction will clears IA32_RTIT_CTL.TraceEn and any attempt to write IA32_RTIT_CTL causes a general-protection exception (#GP). Signed-off-by:
Luwei Kang <luwei.kang@intel.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Chao Peng authored
To save performance overhead, disable intercept Intel PT MSRs read/write when Intel PT is enabled in guest. MSR_IA32_RTIT_CTL is an exception that will always be intercepted. Signed-off-by:
Chao Peng <chao.p.peng@linux.intel.com> Signed-off-by:
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Chao Peng authored
This patch implement Intel Processor Trace MSRs read/write emulation. Intel PT MSRs read/write need to be emulated when Intel PT MSRs is intercepted in guest and during live migration. Signed-off-by:
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Luwei Kang authored
Initialize the Intel PT configuration when cpuid update. Include cpuid inforamtion, rtit_ctl bit mask and the number of address ranges. Signed-off-by:
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Chao Peng authored
Load/Store Intel Processor Trace register in context switch. MSR IA32_RTIT_CTL is loaded/stored automatically from VMCS. In Host-Guest mode, we need load/resore PT MSRs only when PT is enabled in guest. Signed-off-by:
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Chao Peng authored
Expose Intel Processor Trace to guest only when the PT works in Host-Guest mode. Signed-off-by:
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Chao Peng authored
Intel Processor Trace virtualization can be work in one of 2 possible modes: a. System-Wide mode (default): When the host configures Intel PT to collect trace packets of the entire system, it can leave the relevant VMX controls clear to allow VMX-specific packets to provide information across VMX transitions. KVM guest will not aware this feature in this mode and both host and KVM guest trace will output to host buffer. b. Host-Guest mode: Host can configure trace-packet generation while in VMX non-root operation for guests and root operation for native executing normally. Intel PT will be exposed to KVM guest in this mode, and the trace output to respective buffer of host and guest. In this mode, tht status of PT will be saved and disabled before VM-entry and restored after VM-exit if trace a virtual machine. Signed-off-by:
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Luwei Kang authored
This adds support for "output to Trace Transport subsystem" capability of Intel PT. It means that PT can output its trace to an MMIO address range rather than system memory buffer. Acked-by:
Song Liu <songliubraving@fb.com> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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Luwei Kang authored
Add bit definitions for Intel PT MSRs to support trace output directed to the memeory subsystem and holds a count if packet bytes that have been sent out. These are required by the upcoming PT support in KVM guests for MSRs read/write emulation. Signed-off-by:
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Luwei Kang authored
intel_pt_validate_hw_cap() validates whether a given PT capability is supported by the hardware. It checks the PT capability array which reflects the capabilities of the hardware on which the code is executed. For setting up PT for KVM guests this is not correct as the capability array for the guest can be different from the host array. Provide a new function to check against a given capability array. Acked-by:
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Chao Peng authored
pt_cap_get() is required by the upcoming PT support in KVM guests. Export it and move the capabilites enum to a global header. As a global functions, "pt_*" is already used for ptrace and other things, so it makes sense to use "intel_pt_*" as a prefix. Acked-by:
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Chao Peng authored
The Intel Processor Trace (PT) MSR bit defines are in a private header. The upcoming support for PT virtualization requires these defines to be accessible from KVM code. Move them to the global MSR header file. Reviewed-by:
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Andrew Jones authored
When KVM has KVM_CAP_ARM_VM_IPA_SIZE we can test with > 40-bit IPAs by using the 'type' field of KVM_CREATE_VM. Signed-off-by:
Andrew Jones <drjones@redhat.com> Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com>
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Andrew Jones authored
Signed-off-by:
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Andrew Jones authored
Signed-off-by:
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Andrew Jones authored
We need to reset the offset for each mode as it will change depending on the number of guest physical address bits. Signed-off-by:
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Andrew Jones authored
There's no reason not to always test the topmost physical addresses, and if the user wants to try lower addresses then '-p' (used to be '-o before this patch) can be used. Let's remove the '-t' option and just always do what it did. Signed-off-by:
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Andrew Jones authored
It isn't necessary and can even cause problems when testing high guest physical addresses. This patch leaves the test memory id- mapped by default, but when using '-t' the test memory virtual addresses stay the same even though the physical addresses switch to the topmost valid addresses. Signed-off-by:
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Andrew Jones authored
Signed-off-by:
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Wei Yang authored
Signed-off-by:
Wei Yang <richard.weiyang@gmail.com> [Preserved the iff and a probably intentional weird bracket notation. Also dropped the style change to make a single-purpose patch. - Radim] Signed-off-by:
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Peng Hao authored
Update the verbose license text with the matching SPDX license identifier. Signed-off-by:
Peng Hao <peng.hao2@zte.com.cn> [Changed deprecated GPL-2.0+ to GPL-2.0-or-later. - Radim] Signed-off-by:
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Sean Christopherson authored
Although well-intentioned, keeping the KF() definition as a hint for handling scattered CPUID features may be counter-productive. Simply redefining the bit position only works for directly manipulating the guest's CPUID leafs, e.g. it doesn't make guest_cpuid_has() magically work. Taking an alternative approach, e.g. ensuring the bit position is identical between the Linux-defined and hardware-defined features, may be a simpler and/or more effective method of exposing scattered features to the guest. Signed-off-by:
Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by:
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Jim Mattson authored
Let the guest read the IA32_TSC MSR with the generic RDMSR instruction as well as the specific RDTSC(P) instructions. Note that the hardware applies the TSC multiplier and offset (when applicable) to the result of RDMSR(IA32_TSC), just as it does to the result of RDTSC(P). Signed-off-by:
Jim Mattson <jmattson@google.com> Reviewed-by:
Peter Shier <pshier@google.com> Reviewed-by:
Marc Orr <marcorr@google.com> Reviewed-by:
Liran Alon <liran.alon@oracle.com> Signed-off-by:
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Jim Mattson authored
According to the SDM, "NMI-window exiting" VM-exits wake a logical processor from the same inactive states as would an NMI and "interrupt-window exiting" VM-exits wake a logical processor from the same inactive states as would an external interrupt. Specifically, they wake a logical processor from the shutdown state and from the states entered using the HLT and MWAIT instructions. Fixes: 6dfacadd ("KVM: nVMX: Add support for activity state HLT") Signed-off-by:
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Tambe, William authored
Currently, the nested guest's PAUSE intercept intentions are not being honored. Instead, since the L0 hypervisor's pause_filter_count and pause_filter_thresh values are still in place, these values are used instead of those programmed in the VMCB by the L1 hypervisor. To honor the desired PAUSE intercept support of the L1 hypervisor, the L0 hypervisor must use the PAUSE filtering fields of the L1 hypervisor. This requires saving and restoring of both the L0 and L1 hypervisor's PAUSE filtering fields. Signed-off-by:
William Tambe <william.tambe@amd.com> Signed-off-by:
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Jim Mattson authored
Since the offset is added directly to the hva from the gfn_to_hva_cache, a negative offset could result in an out of bounds write. The existing BUG_ON only checks for addresses beyond the end of the gfn_to_hva_cache, not for addresses before the start of the gfn_to_hva_cache. Note that all current call sites have non-negative offsets. Fixes: 4ec6e863 ("kvm: Introduce kvm_write_guest_offset_cached()") Reported-by:
Cfir Cohen <cfir@google.com> Signed-off-by:
Krish Sadhukhan <krish.sadhukhan@oracle.com> Reviewed-by:
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Jim Mattson authored
Previously, in the case where (gpa + len) wrapped around, the entire region was not validated, as the comment claimed. It doesn't actually seem that wraparound should be allowed here at all. Furthermore, since some callers don't check the return code from this function, it seems prudent to clear ghc->memslot in the event of an error. Fixes: 8f964525 ("KVM: Allow cross page reads and writes from cached translations.") Reported-by:
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YueHaibing authored
Remove duplicated include. Signed-off-by:
YueHaibing <yuehaibing@huawei.com> Reviewed-by:
David Hildenbrand <david@redhat.com> Signed-off-by:
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Vitaly Kuznetsov authored
When we get a report like ==== Test Assertion Failure ==== x86_64/state_test.c:157: run->exit_reason == KVM_EXIT_IO pid=955 tid=955 - Success 1 0x0000000000401350: main at state_test.c:154 2 0x00007fc31c9e9412: ?? ??:0 3 0x000000000040159d: _start at ??:? Unexpected exit reason: 8 (SHUTDOWN), it is not obvious which particular stage failed. Add the info. Signed-off-by:Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by:
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Vitaly Kuznetsov authored
AMD doesn't seem to implement MSR_IA32_MCG_EXT_CTL and svm code in kvm knows nothing about it, however, this MSR is among emulated_msrs and thus returned with KVM_GET_MSR_INDEX_LIST. The consequent KVM_GET_MSRS, of course, fails. Report the MSR as unsupported to not confuse userspace. Signed-off-by:
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Paolo Bonzini authored
The memory allocation in b666a4b6 ("kvm: x86: Dynamically allocate guest_fpu", 2018-11-06) is wrong, there are other members in struct fpu before the fpregs_state union and the patch should be doing something similar to the code in fpu__init_task_struct_size. It's enough to run a guest and then rmmod kvm to see slub errors which are actually caused by memory corruption. For now let's revert it to sizeof(struct fpu), which is conservative. I have plans to move fsave/fxsave/xsave directly in KVM, without using the kernel FPU helpers, and once it's done, the size of the object in the cache will be something like kvm_xstate_size. Signed-off-by:
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- 20 Dec, 2018 1 commit
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git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpcRadim Krčmář authored
PPC KVM update for 4.21 from Paul Mackerras The main new feature this time is support in HV nested KVM for passing a device that is emulated by a level 0 hypervisor and presented to level 1 as a PCI device through to a level 2 guest using VFIO. Apart from that there are improvements for migration of radix guests under HV KVM and some other fixes and cleanups.
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- 19 Dec, 2018 8 commits
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Paolo Bonzini authored
Merge tag 'kvm-s390-next-4.21-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD KVM: s390: Fixes for 4.21 Just two small fixes.
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Paolo Bonzini authored
Merge tag 'kvmarm-for-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD KVM/arm updates for 4.21 - Large PUD support for HugeTLB - Single-stepping fixes - Improved tracing - Various timer and vgic fixups
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Marc Zyngier authored
They were missing, and it turns out that we do need them now. Acked-by:
Christoffer Dall <christoffer.dall@arm.com> Signed-off-by:
Marc Zyngier <marc.zyngier@arm.com>
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Marc Zyngier authored
32 and 64bit use different symbols to identify the traps. 32bit has a fine grained approach (prefetch abort, data abort and HVC), while 64bit is pretty happy with just "trap". This has been fine so far, except that we now need to decode some of that in tracepoints that are common to both architectures. Introduce ARM_EXCEPTION_IS_TRAP which abstracts the trap symbols and make the tracepoint use it. Acked-by:
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Will Deacon authored
Although bit 31 of VTCR_EL2 is RES1, we inadvertently end up setting all of the upper 32 bits to 1 as well because we define VTCR_EL2_RES1 as signed, which is sign-extended when assigning to kvm->arch.vtcr. Lucky for us, the architecture currently treats these upper bits as RES0 so, whilst we've been naughty, we haven't set fire to anything yet. Cc: <stable@vger.kernel.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Christoffer Dall <christoffer.dall@arm.com> Signed-off-by:
Will Deacon <will.deacon@arm.com> Signed-off-by:
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Christoffer Dall authored
There are two things we need to take care of when we create block mappings in the stage 2 page tables: (1) The alignment within a PMD between the host address range and the guest IPA range must be the same, since otherwise we end up mapping pages with the wrong offset. (2) The head and tail of a memory slot may not cover a full block size, and we have to take care to not map those with block descriptors, since we could expose memory to the guest that the host did not intend to expose. So far, we have been taking care of (1), but not (2), and our commentary describing (1) was somewhat confusing. This commit attempts to factor out the checks of both into a common function, and if we don't pass the check, we won't attempt any PMD mappings for neither hugetlbfs nor THP. Note that we used to only check the alignment for THP, not for hugetlbfs, but as far as I can tell the check needs to be applied to both scenarios. Cc: Ralph Palutke <ralph.palutke@fau.de> Cc: Lukas Braun <koomi@moshbit.net> Reported-by:
Lukas Braun <koomi@moshbit.net> Signed-off-by:
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Marc Zyngier authored
We currently only halt the guest when a vCPU messes with the active state of an SPI. This is perfectly fine for GICv2, but isn't enough for GICv3, where all vCPUs can access the state of any other vCPU. Let's broaden the condition to include any GICv3 interrupt that has an active state (i.e. all but LPIs). Cc: stable@vger.kernel.org Reviewed-by:
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Marc Zyngier authored
We're pretty blind when it comes to system register tracing, and rely on the ESR value displayed by kvm_handle_sys, which isn't much. Instead, let's add an actual name to the sysreg entries, so that we can finally print it as we're about to perform the access itself. The new tracepoint is conveniently called kvm_sys_access. Signed-off-by:
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