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* drivers/hv: correct tsc page sequence invalid valueAndrey Smetanin2015-12-151-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Hypervisor Top Level Functional Specification v3/4 says that TSC page sequence value = -1(0xFFFFFFFF) is used to indicate that TSC page no longer reliable source of reference timer. Unfortunately, we found that Windows Hyper-V guest side implementation uses sequence value = 0 to indicate that Tsc page no longer valid. This is clearly visible inside Windows 2012R2 ntoskrnl.exe HvlGetReferenceTime() function dissassembly: HvlGetReferenceTime proc near xchg ax, ax loc_1401C3132: mov rax, cs:HvlpReferenceTscPage mov r9d, [rax] test r9d, r9d jz short loc_1401C3176 rdtsc mov rcx, cs:HvlpReferenceTscPage shl rdx, 20h or rdx, rax mov rax, [rcx+8] mov rcx, cs:HvlpReferenceTscPage mov r8, [rcx+10h] mul rdx mov rax, cs:HvlpReferenceTscPage add rdx, r8 mov ecx, [rax] cmp ecx, r9d jnz short loc_1401C3132 jmp short loc_1401C3184 loc_1401C3176: mov ecx, 40000020h rdmsr shl rdx, 20h or rdx, rax loc_1401C3184: mov rax, rdx retn HvlGetReferenceTime endp This patch aligns Tsc page invalid sequence value with Windows Hyper-V guest implementation which is more compatible with both Hyper-V hypervisor and KVM hypervisor. Signed-off-by: Andrey Smetanin <asmetanin@virtuozzo.com> Signed-off-by: Denis V. Lunev <den@openvz.org> CC: "K. Y. Srinivasan" <kys@microsoft.com> CC: Haiyang Zhang <haiyangz@microsoft.com> CC: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Denis V. Lunev <den@openvz.org> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers:hv: Export the API to invoke a hypercall on Hyper-VJake Oshins2015-12-151-10/+10
| | | | | | | | | | | | This patch exposes the function that hv_vmbus.ko uses to make hypercalls. This is necessary for retargeting an interrupt when it is given a new affinity. Since we are exporting this API, rename the API as it will be visible outside the hv.c file. Signed-off-by: Jake Oshins <jakeo@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: vmbus: fix build warningSudip Mukherjee2015-12-141-2/+3
| | | | | | | | We were getting build warning about unused variable "tsc_msr" and "va_tsc" while building for i386 allmodconfig. Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: vmbus: Implement a clocksource based on the TSC pageK. Y. Srinivasan2015-08-051-0/+83
| | | | | | | | | | | | The current Hyper-V clock source is based on the per-partition reference counter and this counter is being accessed via s synthetic MSR - HV_X64_MSR_TIME_REF_COUNT. Hyper-V has a more efficient way of computing the per-partition reference counter value that does not involve reading a synthetic MSR. We implement a time source based on this mechanism. Tested-by: Vivek Yadav <vyadav@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers/hv: Migrate to new 'set-state' interfaceViresh Kumar2015-08-051-26/+19
| | | | | | | | | | | | | | | | Migrate hv driver to the new 'set-state' interface provided by clockevents core, the earlier 'set-mode' interface is marked obsolete now. This also enables us to implement callbacks for new states of clockevent devices, for example: ONESHOT_STOPPED. Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: devel@linuxdriverproject.org Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: vmbus: Improve the CPU affiliation for channelsK. Y. Srinivasan2015-08-051-0/+9
| | | | | | | | | | The current code tracks the assigned CPUs within a NUMA node in the context of the primary channel. So, if we have a VM with a single NUMA node with 8 VCPUs, we may end up unevenly distributing the channel load. Fix the issue by tracking affiliations globally. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: don't do hypercalls when hypercall_page is NULLVitaly Kuznetsov2015-08-051-5/+8
| | | | | | | | | | | | | | At the very late stage of kexec a driver (which are not being unloaded) can try to post a message or signal an event. This will crash the kernel as we already did hv_cleanup() and the hypercall page is NULL. Move all common (between 32 and 64 bit code) declarations to the beginning of the do_hypercall() function. Unfortunately we have to write the !hypercall_page check twice to not mix declarations and code. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: vmbus: remove hv_synic_free_cpu() call from hv_synic_cleanup()Vitaly Kuznetsov2015-08-051-2/+0
| | | | | | | | | | | We already have hv_synic_free() which frees all per-cpu pages for all CPUs, let's remove the hv_synic_free_cpu() call from hv_synic_cleanup() so it will be possible to do separate cleanup (writing to MSRs) and final freeing. This is going to be used to assist kexec. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: vmbus: Teardown clockevent devices on module unloadVitaly Kuznetsov2015-03-021-1/+24
| | | | | | | | | | | | | | | | | | Newly introduced clockevent devices made it impossible to unload hv_vmbus module as clockevents_config_and_register() takes additional reverence to the module. To make it possible again we do the following: - avoid setting dev->owner for clockevent devices; - implement hv_synic_clockevents_cleanup() doing clockevents_unbind_device(); - call it from vmbus_exit(). In theory hv_synic_clockevents_cleanup() can be merged with hv_synic_cleanup(), however, we call hv_synic_cleanup() from smp_call_function_single() and this doesn't work for clockevents_unbind_device() as it does such call on its own. I opted for a separate function. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers: hv: vmbus: Teardown synthetic interrupt controllers on module unloadVitaly Kuznetsov2015-03-021-2/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | SynIC has to be switched off when we unload the module, otherwise registered memory pages can get corrupted after (as Hyper-V host still writes there) and we see the following crashes for random processes: [ 89.116774] BUG: Bad page map in process sh pte:4989c716 pmd:36f81067 [ 89.159454] addr:0000000000437000 vm_flags:00000875 anon_vma: (null) mapping:ffff88007bba55a0 index:37 [ 89.226146] vma->vm_ops->fault: filemap_fault+0x0/0x410 [ 89.257776] vma->vm_file->f_op->mmap: generic_file_mmap+0x0/0x60 [ 89.297570] CPU: 0 PID: 215 Comm: sh Tainted: G B 3.19.0-rc5_bug923184+ #488 [ 89.353738] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090006 05/23/2012 [ 89.409138] 0000000000000000 000000004e083d7b ffff880036e9fa18 ffffffff81a68d31 [ 89.468724] 0000000000000000 0000000000437000 ffff880036e9fa68 ffffffff811a1e3a [ 89.519233] 000000004989c716 0000000000000037 ffffea0001edc340 0000000000437000 [ 89.575751] Call Trace: [ 89.591060] [<ffffffff81a68d31>] dump_stack+0x45/0x57 [ 89.625164] [<ffffffff811a1e3a>] print_bad_pte+0x1aa/0x250 [ 89.667234] [<ffffffff811a2c95>] vm_normal_page+0x55/0xa0 [ 89.703818] [<ffffffff811a3105>] unmap_page_range+0x425/0x8a0 [ 89.737982] [<ffffffff811a3601>] unmap_single_vma+0x81/0xf0 [ 89.780385] [<ffffffff81184320>] ? lru_deactivate_fn+0x190/0x190 [ 89.820130] [<ffffffff811a4131>] unmap_vmas+0x51/0xa0 [ 89.860168] [<ffffffff811ad12c>] exit_mmap+0xac/0x1a0 [ 89.890588] [<ffffffff810763c3>] mmput+0x63/0x100 [ 89.919205] [<ffffffff811eba48>] flush_old_exec+0x3f8/0x8b0 [ 89.962135] [<ffffffff8123b5bb>] load_elf_binary+0x32b/0x1260 [ 89.998581] [<ffffffff811a14f2>] ? get_user_pages+0x52/0x60 hv_synic_cleanup() function exists but noone calls it now. Do the following: - call hv_synic_cleanup() on each cpu from vmbus_exit(); - write global disable bit through MSR; - use hv_synic_free_cpu() to avoid memory leask and code duplication. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: vmbus: Implement a clockevent deviceK. Y. Srinivasan2015-01-251-0/+78
| | | | | | | | | | Implement a clockevent device based on the timer support available on Hyper-V. In this version of the patch I have addressed Jason's review comments. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: vmbus: Cleanup hv_post_message()K. Y. Srinivasan2014-09-241-12/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | Minimize failures in this function by pre-allocating the buffer for posting messages. The hypercall for posting the message can fail for a number of reasons: 1. Transient resource related issues 2. Buffer alignment 3. Buffer cannot span a page boundry We address issues 2 and 3 by preallocating a per-cpu page for the buffer. Transient resource related failures are handled by retrying by the callers of this function. This patch is based on the investigation done by Dexuan Cui <decui@microsoft.com>. I would like to thank Sitsofe Wheeler <sitsofe@yahoo.com> for reporting the issue and helping in debuggging. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reported-by: Sitsofe Wheeler <sitsofe@yahoo.com> Cc: <stable@vger.kernel.org> Tested-by: Sitsofe Wheeler <sitsofe@yahoo.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: vmbus: Implement per-CPU mapping of relid to channelK. Y. Srinivasan2014-05-041-0/+2
| | | | | | | | | | | Currently the mapping of the relID to channel is done under the protection of a single spin lock. Starting with ws2012, each channel is bound to a specific VCPU in the guest. Use this binding to eliminate the spin lock by setting up per-cpu state for mapping relId to the channel. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers: hv: Mark the function hv_synic_free_cpu() as static in hv.cRashika Kheria2013-12-191-1/+1
| | | | | | | | | | | | | This patch marks the function hv_synic_free_cpu() as static in hv.c because it is not used outside this file. Thus, it also eliminates the following warning in hv.c: drivers/hv/hv.c:304:6: warning: no previous prototype for ‘hv_synic_free_cpu’ [-Wmissing-prototypes] Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers: hv: Fix wrong check for synic_event_pageFelipe Pena2013-10-161-1/+1
| | | | | | | | | The check for calling free_page() on hv_context.synic_event_page[cpu] is the same for hv_context.synic_message_page[cpu], like a copy-paste error. Signed-off-by: Felipe Pena <felipensp@gmail.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers: hv: allocate synic structures before hv_synic_init()Jason Wang2013-06-251-32/+53
| | | | | | | | | | | | | We currently allocate synic structures in hv_sync_init(), but there's no way for the driver to know about the allocation failure and it may continue to use the uninitialized pointers. Solve this by introducing helpers for allocating and freeing and doing the allocation before the on_each_cpu() call in vmbus_bus_init(). Cc: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* driver: hv: remove cast for kmalloc return valueZhang Yanfei2013-03-151-3/+2
| | | | | | | | | | remove cast for kmalloc return value. Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: vmbus: Use the new infrastructure for delivering VMBUS interruptsK. Y. Srinivasan2013-02-271-3/+2
| | | | | | | | | | | | | Use the infrastructure for delivering VMBUS interrupts using a special vector. With this patch, we can now properly handle the VMBUS interrupts that can be delivered on any CPU. Also, turn on interrupt load balancing as well. This patch requires the infrastructure that was implemented in the patch: X86: Handle Hyper-V vmbus interrupts as special hypervisor interrupts Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: Cleanup and consolidate reporting of build/version infoK. Y. Srinivasan2013-01-171-7/+0
| | | | | | | | Now, cleanup and consolidate reporting of host and vmbus version numbers. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: Capture the host build informationK. Y. Srinivasan2013-01-171-0/+9
| | | | | | | | | Capture the host build information so it can be presented along with the negotiated vmbus version information. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: Handle vmbus interrupts concurrently on all cpusK. Y. Srinivasan2013-01-171-1/+1
| | | | | | | | | | Vmbus interrupts are unique in that while the interrupt is delivered on a given vector, these can be handled concurrently on different CPUs. Handle the vmbus interrupts concurrently on all the CPUs. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: Manage event tasklets on per-cpu basisK. Y. Srinivasan2013-01-171-0/+12
| | | | | | | | | Now that we can potentially take vmbus interrupts on any CPU, make the tasklets per-CPU. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: Get rid of the unused global signaling stateK. Y. Srinivasan2013-01-171-24/+0
| | | | | | | | | | Now that we have implemented a per-connection signaling mechanism, get rid of the global signaling state. For hosts that don't support per-connection signaling handle, we have moved the global state to be a per-channel state. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: Setup a mapping for Hyper-V's notion cpu IDK. Y. Srinivasan2013-01-171-0/+11
| | | | | | | | | | | On win8 (ws2012), incoming vmbus interrupt load can be spread across all available VCPUs in the guest. On a per-channel basis, the interrupts can be bound to specific CPUs. The Linux notion of cpu ID may be different from that of the hypervisor's. Setup a mapping structure. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: Change the signature for hv_signal_event()K. Y. Srinivasan2013-01-171-4/+3
| | | | | | | | | | In preparation for implementing a per-connection signaling framework, change the signature of the function hv_signal_event(). The current code uses a global handle for signaling the host. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* hv: fail the probing immediately when we are not in hyperv platformJason Wang2012-08-171-25/+0
| | | | | | | | | | | | We wait for about 5 seconds for the success of the hyperv registration even if we were not in hyperv platform. This is suboptimal, so the patch check the cpuid in the beginning of hv_acpi_init() instead of in vmbus_bus_init() to fail the probing immediately. Signed-off-by: Jason Wang <jasowang@redhat.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: Cleanup the guest ID computationK. Y. Srinivasan2012-08-141-3/+6
| | | | | | | | | | | | | | | The current guest ID string in use in vmbus driver does not conform to the MSFT guidelines on guest ID. MSFT currently does not specify Linux specific guidelines. MSFT however has plans to publish Linux specific guidelines. This implementation conforms to the yet unpublished Linux specific guidelines for guest ID. This implementation also broadly conforms to the current guidelines as well. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Cc: Bjørn Mork <bjorn@mork.no> Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* hv: fix return type of hv_post_message()Dan Carpenter2012-04-101-1/+1
| | | | | | | | | | This function returns negative error codes, but because the type is u16 they get truncated into positive numbers. It doesn't look like the callers care, but we should fix it anyway as a cleanup. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers: hv: Increase the number of VCPUs supported in the guestK. Y. Srinivasan2012-02-091-2/+2
| | | | | | | | | | | | | | The current code arbirarily limited the number of CPUs the guest could have. Change that so that we can support the maximum number of CPUs the guest can support. While we use NR_CPUS to size the per-cpu state all we are allocating based on NR_CPUS are the pointers to per-cpu state that will be allocatted in the context of the initializing CPU. This patch triggers a checkpatch warning for the usage of NR_CPU and since all we are allocating a couple of pointers per CPU, it should be ok. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: Get rid of an unnecessary check in hv.cK. Y. Srinivasan2011-12-121-5/+0
| | | | | | | | | In preparation for eventually supporting kexec in Linux VMs on Hyper-V, get rid of an unnecessary check in hv_init(). Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* Drivers: hv: Make the vmbus driver unloadableK. Y. Srinivasan2011-12-121-0/+3
| | | | | | | | | It turns out that the vmbus driver can be made unloadable. Make it unloadable. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* Staging: hv: remove unneeded asm include file in hyperv.hGreg Kroah-Hartman2011-10-111-1/+1
| | | | | | | | No one outside of the hyperv core needs to include the asm/hyperv.h file, so don't put it in the "global" include/linux/hyperv.h file. Cc: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* Staging: hv: move hyperv code out of staging directoryGreg Kroah-Hartman2011-10-111-0/+429
After many years wandering the desert, it is finally time for the Microsoft HyperV code to move out of the staging directory. Or at least the core hyperv bus code, and the utility driver, the rest still have some review to get through by the various subsystem maintainers. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
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