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Alexander Graf 1ae099540e KVM: x86: Allow deflecting unknown MSR accesses to user space 
MSRs are weird. Some of them are normal control registers, such as EFER.
Some however are registers that really are model specific, not very
interesting to virtualization workloads, and not performance critical.
Others again are really just windows into package configuration.

Out of these MSRs, only the first category is necessary to implement in
kernel space. Rarely accessed MSRs, MSRs that should be fine tunes against
certain CPU models and MSRs that contain information on the package level
are much better suited for user space to process. However, over time we have
accumulated a lot of MSRs that are not the first category, but still handled
by in-kernel KVM code.

This patch adds a generic interface to handle WRMSR and RDMSR from user
space. With this, any future MSR that is part of the latter categories can
be handled in user space.

Furthermore, it allows us to replace the existing "ignore_msrs" logic with
something that applies per-VM rather than on the full system. That way you
can run productive VMs in parallel to experimental ones where you don't care
about proper MSR handling.

Signed-off-by: Alexander Graf <graf@amazon.com>
Reviewed-by: Jim Mattson <jmattson@google.com>

Message-Id: <20200925143422.21718-3-graf@amazon.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
 		2020-09-28 07:58:04 -04:00
..
9p.h
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afs.h afs: Add a tracepoint to track the lifetime of the afs_volume struct 2020-06-04 15:37:57 +01:00
alarmtimer.h
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asoc.h
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bcache.h bcache: print written and keys in trace_bcache_btree_write 2020-01-23 11:40:02 -07:00
block.h blktrace: Provide event for request merging 2020-06-25 21:06:11 -06:00
bpf_test_run.h selftests: bpf: test writable buffers in raw tps 2019-04-26 19:04:19 -07:00
bridge.h net: bridge: fdb: br_fdb_update can take flags directly 2019-11-01 10:32:43 -07:00
btrfs.h btrfs: tracepoints: convert flush states to using EM macros 2020-07-27 12:55:30 +02:00
cachefiles.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 2019-05-24 17:27:11 +02:00
cgroup.h cgroup: use cgrp->kn->id as the cgroup ID 2019-11-12 08:18:04 -08:00
clk.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
cma.h
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compaction.h mm/page_alloc: integrate classzone_idx and high_zoneidx 2020-06-03 20:09:44 -07:00
context_tracking.h
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cpuhp.h treewide: Switch printk users from %pf and %pF to %ps and %pS, respectively 2019-04-09 14:19:06 +02:00
devfreq.h trace: events: add devfreq trace event file 2019-04-16 09:29:18 +09:00
devlink.h devlink: Add support for direct reporter health state update 2019-03-04 11:00:43 -08:00
dma_fence.h tracing: Fix header include guards in trace event headers 2019-07-30 21:49:06 -04:00
erofs.h erofs: convert uncompressed files from readpages to readahead 2020-06-02 10:59:07 -07:00
ext4.h ext4: limit the length of per-inode prealloc list 2020-08-19 12:04:36 -04:00
f2fs.h f2fs: support to trace f2fs_fiemap() 2020-07-07 21:51:46 -07:00
fib.h net: Replace nhc_has_gw with nhc_gw_family 2019-04-08 15:22:40 -07:00
fib6.h ipv6: Add fib6_type and fib6_flags to fib6_result 2019-04-17 23:11:30 -07:00
filelock.h locks: revise generic_add_lease tracepoint 2019-07-22 06:54:41 -04:00
filemap.h ftrace: Rework event_create_dir() 2019-11-27 07:44:25 +01:00
fs_dax.h
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fscache.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 2019-05-24 17:27:11 +02:00
fsi.h trace: fsi: Print transfer size unsigned 2019-11-08 11:23:37 +01:00
fsi_master_aspeed.h fsi: aspeed: Add trace points 2019-11-08 11:28:20 +01:00
fsi_master_ast_cf.h fsi: master-ast-cf: Add new FSI master using Aspeed ColdFire 2018-07-23 15:22:52 +10:00
fsi_master_gpio.h fsi: master-gpio: Add more tracepoints 2018-07-12 12:02:31 +10:00
gpio.h tracing: stop making gpio tracing configurable 2019-04-08 15:11:48 +02:00
gpu_mem.h gpu/trace: Minor comment updates for gpu_mem_total tracepoint 2020-05-07 13:32:57 -04:00
host1x.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 1 2019-05-21 11:28:39 +02:00
hswadsp.h
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huge_memory.h khugepaged: introduce 'max_ptes_shared' tunable 2020-06-03 20:09:46 -07:00
hwmon.h hwmon: (core) Add trace events to _attr_show/store functions 2018-10-11 20:07:35 -07:00
i2c.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 2019-05-24 17:27:11 +02:00
ib_mad.h IB/MAD: Add SMP details to MAD tracing 2019-03-27 15:52:01 -03:00
ib_umad.h IB/UMAD: Add umad trace points 2019-03-27 15:52:01 -03:00
initcall.h
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intel-sst.h
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intel_iommu.h iommu/vt-d: trace: Extend map_sg trace event 2020-01-07 14:05:57 +01:00
intel_ish.h
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io_uring.h io_uring: use poll driven retry for files that support it 2020-03-02 14:06:38 -07:00
iocost.h blk-iocost: Fix error on iocost_ioc_vrate_adj 2020-04-21 09:49:36 -06:00
iommu.h
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ipi.h
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irq.h
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irq_matrix.h
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iscsi.h scsi: iscsi: Capture iscsi debug messages using tracepoints 2018-12-20 20:03:55 -05:00
jbd2.h jbd2: Provide trace event for handle restarts 2019-11-05 16:00:49 -05:00
kmem.h mm, tracing: print symbol name for kmem_alloc_node call_site events 2020-01-31 10:30:38 -08:00
kvm.h KVM: x86: Allow deflecting unknown MSR accesses to user space 2020-09-28 07:58:04 -04:00
kyber.h kyber: fix wrong strlcpy() size in trace_kyber_latency() 2018-11-12 08:28:37 -07:00
libata.h
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lock.h
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mce.h
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mdio.h
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migrate.h mm/vmstat: add events for THP migration without split 2020-08-12 10:57:57 -07:00
mlxsw.h mlxsw: spectrum_acl: Rename rehash_dis trace 2019-03-31 11:01:23 -07:00
mmap.h mm: mmap: add trace point of vm_unmapped_area 2020-04-02 09:35:30 -07:00
mmc.h
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mmflags.h Revert "powerpc/64s: Remove PROT_SAO support" 2020-08-24 14:12:53 +10:00
module.h
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napi.h tracing: Fix header include guards in trace event headers 2019-07-30 21:49:06 -04:00
nbd.h nbd: add tracepoints for send/receive timing 2019-04-26 19:04:19 -07:00
neigh.h neighbor: Add tracepoint to __neigh_create 2019-05-22 17:50:24 -07:00
net.h net: add a generic tracepoint for TX queue timeout 2019-05-04 00:41:41 -04:00
net_probe_common.h
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nilfs2.h
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nmi.h
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objagg.h lib: introduce initial implementation of object aggregation manager 2018-11-15 14:43:43 -08:00
oom.h
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page_isolation.h
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page_pool.h page_pool: Add API to update numa node 2019-11-20 11:47:36 -08:00
page_ref.h
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pagemap.h
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percpu.h
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power.h PM: QoS: Simplify definitions of CPU latency QoS trace events 2020-02-13 11:26:39 +01:00
power_cpu_migrate.h
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preemptirq.h tracing: Change offset type to s32 in preempt/irq tracepoints 2020-01-03 11:34:37 -05:00
printk.h
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pwc.h media: usb: pwc: Introduce TRACE_EVENTs for pwc_isoc_handler() 2019-01-16 11:15:11 -05:00
pwm.h pwm: Implement tracing for .get_state() and .apply_state() 2020-01-20 12:28:37 +01:00
qdisc.h net_sched: add a tracepoint for qdisc creation 2020-05-27 15:05:49 -07:00
qla.h scsi: qla2xxx: Suppress two recently introduced compiler warnings 2020-05-19 21:43:01 -04:00
qrtr.h net: qrtr: Add tracepoint support 2020-04-22 12:55:54 -07:00
random.h random32: add a tracepoint for prandom_u32() 2020-08-13 15:11:14 -07:00
rcu.h Merge branches 'doc.2020.06.29a', 'fixes.2020.06.29a', 'kfree_rcu.2020.06.29a', 'rcu-tasks.2020.06.29a', 'scale.2020.06.29a', 'srcu.2020.06.29a' and 'torture.2020.06.29a' into HEAD 2020-06-29 12:03:15 -07:00
rdma.h
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rdma_core.h RDMA/core: Add trace points to follow MR allocation 2020-01-07 16:10:53 -04:00
regulator.h regulator: core: Add regulator bypass trace points 2020-05-29 17:17:02 +01:00
rpcgss.h SUNRPC: Augment server-side rpcgss tracepoints 2020-07-13 17:28:24 -04:00
rpcrdma.h svcrdma: Display chunk completion ID when posting a rw_ctxt 2020-07-13 17:28:24 -04:00
rpm.h PM-runtime: add tracepoints for usage_count changes 2020-01-13 12:28:29 +01:00
rseq.h
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rtc.h
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rxrpc.h rxrpc: Fix loss of RTT samples due to interposed ACK 2020-08-20 17:59:27 +01:00
sched.h trace/events/sched.h: fix duplicated word 2020-07-22 10:22:05 +02:00
scmi.h firmware: arm_scmi: Use signed integer to report transfer status 2020-06-30 14:07:08 +01:00
scsi.h
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sctp.h sctp: move trace_sctp_probe_path into sctp_outq_sack 2019-12-26 13:06:45 -08:00
signal.h signal: Distinguish between kernel_siginfo and siginfo 2018-10-03 16:47:43 +02:00
siox.h
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skb.h
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smbus.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 2019-05-24 17:27:11 +02:00
sock.h tcp: Define IPPROTO_MPTCP 2020-01-09 18:41:41 -08:00
spi.h spi/trace: Cap buffer contents at 64 bytes 2019-05-02 10:37:52 +09:00
spmi.h
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sunrpc.h SUNRPC: Refresh the show_rqstp_flags() macro 2020-07-26 16:08:59 -04:00
sunvnet.h
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swiotlb.h
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syscalls.h syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
target.h scsi: target: core: add task tag to trace events 2020-03-26 21:56:04 -04:00
task.h
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tcp.h tcp: remove redundant new line from tcp_event_sk_skb 2019-11-09 19:41:50 -08:00
tegra_apb_dma.h tracing: Fix header include guards in trace event headers 2019-07-30 21:49:06 -04:00
thermal.h
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thermal_power_allocator.h
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thp.h
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timer.h y2038: syscall implementation cleanups 2019-12-01 14:00:59 -08:00
tlb.h
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udp.h
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ufs.h scsi: ufs: Add trace event for UIC commands 2020-06-15 23:35:06 -04:00
v4l2.h media: v4l2: abstract timeval handling in v4l2_buffer 2020-01-03 15:43:35 +01:00
vb2.h
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vmscan.h mm/page_alloc: integrate classzone_idx and high_zoneidx 2020-06-03 20:09:44 -07:00
vsock_virtio_transport_common.h
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wbt.h bdi: use bdi_dev_name() to get device name 2020-05-09 16:07:39 -06:00
workqueue.h workqueue: remove workqueue_work event class 2020-01-15 08:02:59 -08:00
writeback.h writeback: Drop I_DIRTY_TIME_EXPIRE 2020-06-15 09:18:46 +02:00
xdp.h bpf: cpumap: Implement XDP_REDIRECT for eBPF programs attached to map entries 2020-07-16 17:00:32 +02:00
xen.h tracing: xen: Ordered comparison of function pointers 2020-01-14 15:55:57 -05:00