- 21 Apr, 2017 9 commits
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Marcelo Tosatti authored
The disablement of interrupts at KVM_SET_CLOCK/KVM_GET_CLOCK attempts to disable software suspend from causing "non atomic behaviour" of the operation: Add a helper function to compute the kernel time and convert nanoseconds back to CPU specific cycles. Note that these must not be called in preemptible context, as that would mean the kernel could enter software suspend state, which would cause non-atomic operation. However, assume the kernel can enter software suspend at the following 2 points: ktime_get_ts(&ts); 1. hypothetical_ktime_get_ts(&ts) monotonic_to_bootbased(&ts); 2. monotonic_to_bootbased() should be correct relative to a ktime_get_ts(&ts) performed after point 1 (that is after resuming from software suspend), hypothetical_ktime_get_ts() Therefore it is also correct for the ktime_get_ts(&ts) before point 1, which is ktime_get_ts(&ts) = hypothetical_ktime_get_ts(&ts) + time-to-execute-suspend-code Note CLOCK_MONOTONIC does not count during suspension. So remove the irq disablement, which causes the following warning on -RT kernels: With this reasoning, and the -RT bug that the irq disablement causes (because spin_lock is now a sleeping lock), remove the IRQ protection as it causes: [ 1064.668109] in_atomic(): 0, irqs_disabled(): 1, pid: 15296, name:m [ 1064.668110] INFO: lockdep is turned off. [ 1064.668110] irq event stamp: 0 [ 1064.668112] hardirqs last enabled at (0): [< (null)>] ) [ 1064.668116] hardirqs last disabled at (0): [] c0 [ 1064.668118] softirqs last enabled at (0): [] c0 [ 1064.668118] softirqs last disabled at (0): [< (null)>] ) [ 1064.668121] CPU: 13 PID: 15296 Comm: qemu-kvm Not tainted 3.10.0-1 [ 1064.668121] Hardware name: Dell Inc. PowerEdge R730/0H21J3, BIOS 5 [ 1064.668123] ffff8c1796b88000 00000000afe7344c ffff8c179abf3c68 f3 [ 1064.668125] ffff8c179abf3c90 ffffffff930ccb3d ffff8c1b992b3610 f0 [ 1064.668126] 00007ffc1a26fbc0 ffff8c179abf3cb0 ffffffff9375f694 f0 [ 1064.668126] Call Trace: [ 1064.668132] [] dump_stack+0x19/0x1b [ 1064.668135] [] __might_sleep+0x12d/0x1f0 [ 1064.668138] [] rt_spin_lock+0x24/0x60 [ 1064.668155] [] __get_kvmclock_ns+0x36/0x110 [k] [ 1064.668159] [] ? futex_wait_queue_me+0x103/0x10 [ 1064.668171] [] kvm_arch_vm_ioctl+0xa2/0xd70 [k] [ 1064.668173] [] ? futex_wait+0x1ac/0x2a0 v2: notice get_kvmclock_ns with the same problem (Pankaj). v3: remove useless helper function (Pankaj). Signed-off-by:
Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Michael S. Tsirkin authored
Guests that are heavy on futexes end up IPI'ing each other a lot. That can lead to significant slowdowns and latency increase for those guests when running within KVM. If only a single guest is needed on a host, we have a lot of spare host CPU time we can throw at the problem. Modern CPUs implement a feature called "MWAIT" which allows guests to wake up sleeping remote CPUs without an IPI - thus without an exit - at the expense of never going out of guest context. The decision whether this is something sensible to use should be up to the VM admin, so to user space. We can however allow MWAIT execution on systems that support it properly hardware wise. This patch adds a CAP to user space and a KVM cpuid leaf to indicate availability of native MWAIT execution. With that enabled, the worst a guest can do is waste as many cycles as a "jmp ." would do, so it's not a privilege problem. We consciously do *not* expose the feature in our CPUID bitmap, as most people will want to benefit from sleeping vCPUs to allow for over commit. Reported-by:
"Gabriel L. Somlo" <gsomlo@gmail.com> Signed-off-by:
Michael S. Tsirkin <mst@redhat.com> [agraf: fix amd, change commit message] Signed-off-by:
Alexander Graf <agraf@suse.de> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Kyle Huey authored
Hardware support for faulting on the cpuid instruction is not required to emulate it, because cpuid triggers a VM exit anyways. KVM handles the relevant MSRs (MSR_PLATFORM_INFO and MSR_MISC_FEATURES_ENABLE) and upon a cpuid-induced VM exit checks the cpuid faulting state and the CPL. kvm_require_cpl is even kind enough to inject the GP fault for us. Signed-off-by:
Kyle Huey <khuey@kylehuey.com> Reviewed-by:
David Matlack <dmatlack@google.com> [Return "1" from kvm_emulate_cpuid, it's not void. - Paolo] Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Paolo Bonzini authored
Merge tag 'kvm-s390-next-4.12-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD KVM: s390: Guarded storage fixup and keyless subset mode - detect and use the keyless subset mode (guests without storage keys) - fix vSIE support for sdnxc - fix machine check data for guarded storage
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Paolo Bonzini authored
Merge branch 'kvm-ppc-next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc into HEAD
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipPaolo Bonzini authored
Required for KVM support of the CPUID faulting feature. Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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David Hildenbrand authored
vmm_exclusive=0 leads to KVM setting X86_CR4_VMXE always and calling VMXON only when the vcpu is loaded. X86_CR4_VMXE is used as an indication in cpu_emergency_vmxoff() (called on kdump) if VMXOFF has to be called. This is obviously not the case if both are used independtly. Calling VMXOFF without a previous VMXON will result in an exception. In addition, X86_CR4_VMXE is used as a mean to test if VMX is already in use by another VMM in hardware_enable(). So there can't really be co-existance. If the other VMM is prepared for co-existance and does a similar check, only one VMM can exist. If the other VMM is not prepared and blindly sets/clears X86_CR4_VMXE, we will get inconsistencies with X86_CR4_VMXE. As we also had bug reports related to clearing of vmcs with vmm_exclusive=0 this seems to be pretty much untested. So let's better drop it. While at it, directly move setting/clearing X86_CR4_VMXE into kvm_cpu_vmxon/off. Signed-off-by:
David Hildenbrand <david@redhat.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Farhan Ali authored
If the KSS facility is available on the machine, we also make it available for our KVM guests. The KSS facility bypasses storage key management as long as the guest does not issue a related instruction. When that happens, the control is returned to the host, which has to turn off KSS for a guest vcpu before retrying the instruction. Signed-off-by:
Corey S. McQuay <csmcquay@linux.vnet.ibm.com> Signed-off-by:
Farhan Ali <alifm@linux.vnet.ibm.com> Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com>
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Farhan Ali authored
Let's detect the keyless subset facility. Signed-off-by:
Farhan Ali <alifm@linux.vnet.ibm.com> Reviewed-by:
Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by:
Christian Borntraeger <borntraeger@de.ibm.com> Acked-by:
Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com>
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- 20 Apr, 2017 19 commits
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Thomas Huth authored
According to the PowerISA 2.07, mtspr and mfspr should not always generate an illegal instruction exception when being used with an undefined SPR, but rather treat the instruction as a NOP or inject a privilege exception in some cases, too - depending on the SPR number. Also turn the printk here into a ratelimited print statement, so that the guest can not flood the dmesg log of the host by issueing lots of illegal mtspr/mfspr instruction here. Signed-off-by:
Thomas Huth <thuth@redhat.com> Signed-off-by:
Paul Mackerras <paulus@ozlabs.org>
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Alexey Kardashevskiy authored
This allows the host kernel to handle H_PUT_TCE, H_PUT_TCE_INDIRECT and H_STUFF_TCE requests targeted an IOMMU TCE table used for VFIO without passing them to user space which saves time on switching to user space and back. This adds H_PUT_TCE/H_PUT_TCE_INDIRECT/H_STUFF_TCE handlers to KVM. KVM tries to handle a TCE request in the real mode, if failed it passes the request to the virtual mode to complete the operation. If it a virtual mode handler fails, the request is passed to the user space; this is not expected to happen though. To avoid dealing with page use counters (which is tricky in real mode), this only accelerates SPAPR TCE IOMMU v2 clients which are required to pre-register the userspace memory. The very first TCE request will be handled in the VFIO SPAPR TCE driver anyway as the userspace view of the TCE table (iommu_table::it_userspace) is not allocated till the very first mapping happens and we cannot call vmalloc in real mode. If we fail to update a hardware IOMMU table unexpected reason, we just clear it and move on as there is nothing really we can do about it - for example, if we hot plug a VFIO device to a guest, existing TCE tables will be mirrored automatically to the hardware and there is no interface to report to the guest about possible failures. This adds new attribute - KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE - to the VFIO KVM device. It takes a VFIO group fd and SPAPR TCE table fd and associates a physical IOMMU table with the SPAPR TCE table (which is a guest view of the hardware IOMMU table). The iommu_table object is cached and referenced so we do not have to look up for it in real mode. This does not implement the UNSET counterpart as there is no use for it - once the acceleration is enabled, the existing userspace won't disable it unless a VFIO container is destroyed; this adds necessary cleanup to the KVM_DEV_VFIO_GROUP_DEL handler. This advertises the new KVM_CAP_SPAPR_TCE_VFIO capability to the user space. This adds real mode version of WARN_ON_ONCE() as the generic version causes problems with rcu_sched. Since we testing what vmalloc_to_phys() returns in the code, this also adds a check for already existing vmalloc_to_phys() call in kvmppc_rm_h_put_tce_indirect(). This finally makes use of vfio_external_user_iommu_id() which was introduced quite some time ago and was considered for removal. Tests show that this patch increases transmission speed from 220MB/s to 750..1020MB/s on 10Gb network (Chelsea CXGB3 10Gb ethernet card). Signed-off-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Acked-by:
Alex Williamson <alex.williamson@redhat.com> Reviewed-by:
David Gibson <david@gibson.dropbear.id.au> Signed-off-by:
Paul Mackerras <paulus@ozlabs.org>
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Alexey Kardashevskiy authored
This reworks helpers for checking TCE update parameters in way they can be used in KVM. This should cause no behavioral change. Signed-off-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by:
David Gibson <david@gibson.dropbear.id.au> Acked-by:
Michael Ellerman <mpe@ellerman.id.au> Signed-off-by:
Paul Mackerras <paulus@ozlabs.org>
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Alexey Kardashevskiy authored
VFIO on sPAPR already implements guest memory pre-registration when the entire guest RAM gets pinned. This can be used to translate the physical address of a guest page containing the TCE list from H_PUT_TCE_INDIRECT. This makes use of the pre-registrered memory API to access TCE list pages in order to avoid unnecessary locking on the KVM memory reverse map as we know that all of guest memory is pinned and we have a flat array mapping GPA to HPA which makes it simpler and quicker to index into that array (even with looking up the kernel page tables in vmalloc_to_phys) than it is to find the memslot, lock the rmap entry, look up the user page tables, and unlock the rmap entry. Note that the rmap pointer is initialized to NULL where declared (not in this patch). If a requested chunk of memory has not been preregistered, this will fall back to non-preregistered case and lock rmap. Signed-off-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by:
David Gibson <david@gibson.dropbear.id.au> Signed-off-by:
Paul Mackerras <paulus@ozlabs.org>
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Alexey Kardashevskiy authored
The guest view TCE tables are per KVM anyway (not per VCPU) so pass kvm* there. This will be used in the following patches where we will be attaching VFIO containers to LIOBNs via ioctl() to KVM (rather than to VCPU). Signed-off-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by:
David Gibson <david@gibson.dropbear.id.au> Signed-off-by:
Paul Mackerras <paulus@ozlabs.org>
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Alexey Kardashevskiy authored
It does not make much sense to have KVM in book3s-64 and not to have IOMMU bits for PCI pass through support as it costs little and allows VFIO to function on book3s KVM. Having IOMMU_API always enabled makes it unnecessary to have a lot of "#ifdef IOMMU_API" in arch/powerpc/kvm/book3s_64_vio*. With those ifdef's we could have only user space emulated devices accelerated (but not VFIO) which do not seem to be very useful. Signed-off-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by:
David Gibson <david@gibson.dropbear.id.au> Signed-off-by:
Paul Mackerras <paulus@ozlabs.org>
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Alexey Kardashevskiy authored
This adds a capability number for in-kernel support for VFIO on SPAPR platform. The capability will tell the user space whether in-kernel handlers of H_PUT_TCE can handle VFIO-targeted requests or not. If not, the user space must not attempt allocating a TCE table in the host kernel via the KVM_CREATE_SPAPR_TCE KVM ioctl because in that case TCE requests will not be passed to the user space which is desired action in the situation like that. Signed-off-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by:
David Gibson <david@gibson.dropbear.id.au> Signed-off-by:
Paul Mackerras <paulus@ozlabs.org>
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Paul Mackerras authored
This merges in the commits in the topic/ppc-kvm branch of the powerpc tree to get the changes to arch/powerpc which subsequent patches will rely on. Signed-off-by:
Paul Mackerras <paulus@ozlabs.org>
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Alexey Kardashevskiy authored
At the moment the userspace can request a table smaller than a page size and this value will be stored as kvmppc_spapr_tce_table::size. However the actual allocated size will still be aligned to the system page size as alloc_page() is used there. This aligns the table size up to the system page size. It should not change the existing behaviour but when in-kernel TCE acceleration patchset reaches the upstream kernel, this will allow small TCE tables be accelerated as well: PCI IODA iommu_table allocator already aligns the size and, without this patch, an IOMMU group won't attach to LIOBN due to the mismatching table size. Reviewed-by:
David Gibson <david@gibson.dropbear.id.au> Signed-off-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by:
Paul Mackerras <paulus@ozlabs.org>
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Alexey Kardashevskiy authored
PR KVM page fault handler performs eaddr to pte translation for a guest, however kvmppc_mmu_book3s_64_xlate() does not preserve WIMG bits (storage control) in the kvmppc_pte struct. If PR KVM is running as a second level guest under HV KVM, and PR KVM tries inserting HPT entry, this fails in HV KVM if it already has this mapping. This preserves WIMG bits between kvmppc_mmu_book3s_64_xlate() and kvmppc_mmu_map_page(). Signed-off-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by:
David Gibson <david@gibson.dropbear.id.au> Signed-off-by:
Paul Mackerras <paulus@ozlabs.org>
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Alexey Kardashevskiy authored
At the moment kvmppc_mmu_map_page() returns -1 if mmu_hash_ops.hpte_insert() fails for any reason so the page fault handler resumes the guest and it faults on the same address again. This adds distinction to kvmppc_mmu_map_page() to return -EIO if mmu_hash_ops.hpte_insert() failed for a reason other than full pteg. At the moment only pSeries_lpar_hpte_insert() returns -2 if plpar_pte_enter() failed with a code other than H_PTEG_FULL. Other mmu_hash_ops.hpte_insert() instances can only fail with -1 "full pteg". With this change, if PR KVM fails to update HPT, it can signal the userspace about this instead of returning to guest and having the very same page fault over and over again. Signed-off-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by:
David Gibson <david@gibson.dropbear.id.au> Signed-off-by:
Paul Mackerras <paulus@ozlabs.org>
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Alexey Kardashevskiy authored
@is_mmio has never been used since introduction in commit 2f4cf5e4 ("Add book3s.c") from 2009. Signed-off-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by:
Paul Mackerras <paulus@ozlabs.org>
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Markus Elfring authored
* A multiplication for the size determination of a memory allocation indicated that an array data structure should be processed. Thus use the corresponding function "kcalloc". This issue was detected by using the Coccinelle software. * Replace the specification of a data type by a pointer dereference to make the corresponding size determination a bit safer according to the Linux coding style convention. Signed-off-by:
Markus Elfring <elfring@users.sourceforge.net> Signed-off-by:
Paul Mackerras <paulus@ozlabs.org>
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Markus Elfring authored
Add a jump target so that a bit of exception handling can be better reused at the end of this function. Signed-off-by:
Markus Elfring <elfring@users.sourceforge.net> Signed-off-by:
Paul Mackerras <paulus@ozlabs.org>
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Paul Mackerras authored
For completeness, this adds emulation of the lfiwax and lfiwzx instructions. With this, all floating-point load and store instructions as of Power ISA V2.07 are emulated. Signed-off-by:
Paul Mackerras <paulus@ozlabs.org>
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Paul Mackerras authored
This adds emulation for the following integer loads and stores, thus enabling them to be used in a guest for accessing emulated MMIO locations. - lhaux - lwaux - lwzux - ldu - lwa - stdux - stwux - stdu - ldbrx - stdbrx Previously, most of these would cause an emulation failure exit to userspace, though ldu and lwa got treated incorrectly as ld, and stdu got treated incorrectly as std. This also tidies up some of the formatting and updates the comment listing instructions that still need to be implemented. With this, all integer loads and stores that are defined in the Power ISA v2.07 are emulated, except for those that are permitted to trap when used on cache-inhibited or write-through mappings (and which do in fact trap on POWER8), that is, lmw/stmw, lswi/stswi, lswx/stswx, lq/stq, and l[bhwdq]arx/st[bhwdq]cx. Signed-off-by:
Paul Mackerras <paulus@ozlabs.org>
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Alexey Kardashevskiy authored
This adds missing stdx emulation for emulated MMIO accesses by KVM guests. This allows the Mellanox mlx5_core driver from recent kernels to work when MMIO emulation is enforced by userspace. Signed-off-by:
Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by:
Paul Mackerras <paulus@ozlabs.org>
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Bin Lu authored
This patch provides the MMIO load/store emulation for instructions of 'double & vector unsigned char & vector signed char & vector unsigned short & vector signed short & vector unsigned int & vector signed int & vector double '. The instructions that this adds emulation for are: - ldx, ldux, lwax, - lfs, lfsx, lfsu, lfsux, lfd, lfdx, lfdu, lfdux, - stfs, stfsx, stfsu, stfsux, stfd, stfdx, stfdu, stfdux, stfiwx, - lxsdx, lxsspx, lxsiwax, lxsiwzx, lxvd2x, lxvw4x, lxvdsx, - stxsdx, stxsspx, stxsiwx, stxvd2x, stxvw4x [paulus@ozlabs.org - some cleanups, fixes and rework, make it compile for Book E, fix build when PR KVM is built in] Signed-off-by:
Bin Lu <lblulb@linux.vnet.ibm.com> Signed-off-by:
Paul Mackerras <paulus@ozlabs.org>
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Paul Mackerras authored
This provides functions that can be used for generating interrupts indicating that a given functional unit (floating point, vector, or VSX) is unavailable. These functions will be used in instruction emulation code. Signed-off-by:
Paul Mackerras <paulus@ozlabs.org>
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- 13 Apr, 2017 1 commit
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Radim Krčmář authored
I have introduced this bug when applying and simplifying Paolo's patch as we agreed on the list. The original was "x &= ~y; if (z) x |= y;". Here is the story of a bad workflow: A maintainer was already testing with the intended change, but it was applied only to a testing repo on a different machine. When the time to push tested patches to kvm/next came, he realized that this change was missing and quickly added it to the maintenance repo, didn't test again (because the change is trivial, right), and pushed the world to fire. Fixes: ae1e2d10 ("kvm: nVMX: support EPT accessed/dirty bits") Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com>
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- 12 Apr, 2017 11 commits
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Ladi Prosek authored
Hyper-V writes 0x800000000000 to MSR_AMD64_DC_CFG when running on AMD CPUs as recommended in erratum 383, analogous to our svm_init_erratum_383. By ignoring the MSR, this patch enables running Hyper-V in L1 on AMD. Signed-off-by:
Ladi Prosek <lprosek@redhat.com> Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com>
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Wanpeng Li authored
virt_xxx memory barriers are implemented trivially using the low-level __smp_xxx macros, __smp_xxx is equal to a compiler barrier for strong TSO memory model, however, mandatory barriers will unconditional add memory barriers, this patch replaces the rmb() in kvm_steal_clock() by virt_rmb(). Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by:
Wanpeng Li <wanpeng.li@hotmail.com> Reviewed-by:
Paolo Bonzini <pbonzini@redhat.com> Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com>
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Denis Plotnikov authored
VCPU TSC synchronization is perfromed in kvm_write_tsc() when the TSC value being set is within 1 second from the expected, as obtained by extrapolating of the TSC in already synchronized VCPUs. This is naturally achieved on all VCPUs at VM start and resume; however on VCPU hotplug it is not: the newly added VCPU is created with TSC == 0 while others are well ahead. To compensate for that, consider host-initiated kvm_write_tsc() with TSC == 0 a special case requiring synchronization regardless of the current TSC on other VCPUs. Signed-off-by:
Denis Plotnikov <dplotnikov@virtuozzo.com> Reviewed-by:
Roman Kagan <rkagan@virtuozzo.com> Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com>
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Denis Plotnikov authored
Reuse existing code instead of using inline asm. Make the code more concise and clear in the TSC synchronization part. Signed-off-by:
Denis Plotnikov <dplotnikov@virtuozzo.com> Reviewed-by:
Roman Kagan <rkagan@virtuozzo.com> Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com>
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David Hildenbrand authored
Although the current check is not wrong, this check explicitly includes the pic. Signed-off-by:
David Hildenbrand <david@redhat.com> Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com>
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David Hildenbrand authored
Signed-off-by:
David Hildenbrand <david@redhat.com> Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com>
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David Hildenbrand authored
Now it looks almost as picdev_write(). Signed-off-by:
David Hildenbrand <david@redhat.com> Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com>
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David Hildenbrand authored
We already have the exact same checks a couple of lines below. Signed-off-by:
David Hildenbrand <david@redhat.com> Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com>
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David Hildenbrand authored
Not used outside of i8259.c, so let's make it static. Signed-off-by:
David Hildenbrand <david@redhat.com> Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com>
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David Hildenbrand authored
We can easily compact this code and get rid of one local variable. Reviewed-by:
Peter Xu <peterx@redhat.com> Signed-off-by:
David Hildenbrand <david@redhat.com> Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com>
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David Hildenbrand authored
Let's drop the goto and return the error value directly. Suggested-by:
Peter Xu <peterx@redhat.com> Signed-off-by:
David Hildenbrand <david@redhat.com> Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com>
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