- 06 Apr, 2017 1 commit
-
-
git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/kvm-mipsRadim Krčmář authored
From: James Hogan <james.hogan@imgtec.com> KVM: MIPS: VZ support, Octeon III, and TLBR Add basic support for the MIPS Virtualization Module (generally known as MIPS VZ) in KVM. We primarily support the ImgTec P5600, P6600, I6400, and Cavium Octeon III cores so far. Support is included for the following VZ / guest hardware features: - MIPS32 and MIPS64, r5 (VZ requires r5 or later) and r6 - TLBs with GuestID (IMG cores) or Root ASID Dealias (Octeon III) - Shared physical root/guest TLB (IMG cores) - FPU / MSA - Cop0 timer (up to 1GHz for now due to soft timer limit) - Segmentation control (EVA) - Hardware page table walker (HTW) both for root and guest TLB Also included is a proper implementation of the TLBR instruction for the trap & emulate MIPS KVM implementation. Preliminary MIPS architecture changes are applied directly with Ralf's ack.
-
- 29 Mar, 2017 17 commits
-
-
Stefan Raspl authored
Add column '%Total' next to 'Total' for easier comparison of numbers between hosts. Signed-off-by:
Stefan Raspl <raspl@linux.vnet.ibm.com> Marc Hartmayer <mhartmay@linux.vnet.ibm.com> Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com>
-
Stefan Raspl authored
Provide an interactive command to reset the tracepoint statistics. Requires some extra work for debugfs, as the counters cannot be reset. On the up side, this offers us the opportunity to have debugfs values reset on startup and whenever a filter is modified, becoming consistent with the tracepoint provider. As a bonus, 'kvmstat -dt' will now provide useful output, instead of mixing values in totally different orders of magnitude. Furthermore, we avoid unnecessary resets when any of the filters is "changed" interactively to the previous value. Signed-off-by:
Janosch Frank <frankja@linux.vnet.ibm.com> Signed-off-by:
-
Stefan Raspl authored
Provide a real simple way to erase any active filter. Signed-off-by:
Marc Hartmayer <mhartmay@linux.vnet.ibm.com> Signed-off-by:
-
Stefan Raspl authored
Add a new option '-g'/'--guest' to select a particular process by providing the QEMU guest name. Notes: - The logic to figure out the pid corresponding to the guest name might look scary, but works pretty reliably in practice; in the unlikely event that it returns add'l flukes, it will bail out and hint at using '-p' instead, no harm done. - Mixing '-g' and '-p' is possible, and the final instance specified on the command line is the significant one. This is consistent with current behavior for '-p' which, if specified multiple times, also regards the final instance as the significant one. Signed-off-by:
-
Stefan Raspl authored
Behavior on empty/0 input for regex and pid filtering was inconsistent, as the former would keep the current filter, while the latter would (naturally) remove any pid filtering. Make things consistent by falling back to the default filter on empty input for the regex filter dialogue. Signed-off-by:
-
Stefan Raspl authored
If a user defines a regex filter through the interactive command, display the active regex in the header's second line. Signed-off-by:
-
Stefan Raspl authored
Print helpful messages in case users enter invalid input or invalid pids in the interactive pid filter dialogue. Signed-off-by:
-
Stefan Raspl authored
Improve consistency in the interactive dialogue for pid filtering by removing any filters on empty input (in addition to entering 0). Signed-off-by:
-
Stefan Raspl authored
When running kvm_stat with option '-p' to filter per process, display the QEMU guest name next to the pid, if available. Signed-off-by:
-
Stefan Raspl authored
Apart from the source code, there does not seem to be a place that documents the interactive capabilities of kvm_stat yet. Signed-off-by:
-
Stefan Raspl authored
Whenever a user adds a filter, we * redraw the header immediately for a snappy response * print a message indicating to the user that we're busy while the noticeable delay induced by updating all of the stats objects takes place * update the statistics ASAP (i.e. after 0.25s instead of 3s) to be consistent with behavior on startup To do so, we split the Tui's refresh() method to allow for drawing header and stats separately, and trigger a header refresh whenever we are about to do something that takes a while - like updating filters. Signed-off-by:
-
Stefan Raspl authored
Provides all missing empty lines as required for full PEP compliance. Signed-off-by:
-
Stefan Raspl authored
Updating the fields of the TracepointProvider does not propagate changes to the tracepoints. This shows when a pid filter is enabled, whereby subsequent extensions of the fields of the Tracepoint provider (e.g. by toggling drilldown) will not modify the tracepoints as required. To reproduce, select a specific process via interactive command 'p', and enable drilldown via 'x' - none of the fields with the braces will appear although they should. The fix will always leave all available fields in the TracepointProvider enabled. Signed-off-by:
-
Stefan Raspl authored
Addresses - eliminate extra import - missing variable initialization - type redefinition from int to float - passing of int type argument instead of string - a couple of PEP8-reported indentation/formatting glitches - remove unused variable drilldown in class Tui Signed-off-by:
-
Stefan Raspl authored
SIGINT causes ugly unhandled exceptions in log and batch mode, which we prevent by catching the exceptions accordingly. Signed-off-by:
-
Stefan Raspl authored
The previous version was catching all exceptions, including SIGINT. We only want to catch the curses exceptions here. Signed-off-by:
Sascha Silbe <silbe@linux.vnet.ibm.com> Reviewed-by:
-
Stefan Raspl authored
When running kvm_stat in interactive mode, the cursor appears at the lower left corner, which looks a bit distracting. This patch hides the cursor by turning it invisible. Signed-off-by:
-
- 28 Mar, 2017 22 commits
-
-
James Hogan authored
Properly implement emulation of the TLBR instruction for Trap & Emulate. This instruction reads the TLB entry pointed at by the CP0_Index register into the other TLB registers, which may have the side effect of changing the current ASID. Therefore abstract the CP0_EntryHi and ASID changing code into a common function in the process. A comment indicated that Linux doesn't use TLBR, which is true during normal use, however dumping of the TLB does use it (for example with the relatively recent 'x' magic sysrq key), as does a wired TLB entries test case in my KVM tests. Signed-off-by:
James Hogan <james.hogan@imgtec.com> Acked-by:
Ralf Baechle <ralf@linux-mips.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org
-
James Hogan authored
Octeon III has VZ ASE support, so allow KVM to be enabled on Octeon CPUs as it should now be functional. Signed-off-by: -
James Hogan authored
Octeon III implements a read-only guest CP0_PRid register, so add cases to the KVM register access API for Octeon to ensure the correct value is read and writes are ignored. Signed-off-by: -
James Hogan authored
Octeon III doesn't implement the optional GuestCtl0.CG bit to allow guest mode to execute virtual address based CACHE instructions, so implement emulation of a few important ones specifically for Octeon III in response to a GPSI exception. Currently the main reason to perform these operations is for icache synchronisation, so they are implemented as a simple icache flush with local_flush_icache_range(). Signed-off-by: -
James Hogan authored
Set up hardware virtualisation on Octeon III cores, configuring guest interrupt routing and carving out half of the root TLB for guest use, restoring it back again afterwards. We need to be careful to inhibit TLB shutdown machine check exceptions while invalidating guest TLB entries, since TLB invalidation is not available so guest entries must be invalidated by setting them to unique unmapped addresses, which could conflict with mappings set by the guest or root if recently repartitioned. Signed-off-by: -
James Hogan authored
Octeon CPUs don't report the correct dcache line size in CP0_Config1.DL, so encode the correct value for the guest CP0_Config1.DL based on cpu_dcache_line_size(). Signed-off-by: -
James Hogan authored
When TLB entries are invalidated in the presence of a virtually tagged icache, such as that found on Octeon CPUs, flush the icache so that we don't get a reserved instruction exception even though the TLB mapping is removed. Signed-off-by: -
James Hogan authored
Cache management is implemented separately for Cavium Octeon CPUs, so r4k_blast_[id]cache aren't available. Instead for Octeon perform a local icache flush using local_flush_icache_range(), and for other platforms which don't use c-r4k.c use __flush_cache_all() / flush_icache_all(). Signed-off-by: -
James Hogan authored
Add accessors for some VZ related Cavium Octeon III specific COP0 registers, along with field definitions. These will mostly be used by KVM to set up interrupt routing and partition the TLB between root and guest. Signed-off-by:
-
James Hogan authored
Create a trace event for guest mode changes, and enable VZ's GuestCtl0.MC bit after the trace event is enabled to trap all guest mode changes. The MC bit causes Guest Hardware Field Change (GHFC) exceptions whenever a guest mode change occurs (such as an exception entry or return from exception), so we need to handle this exception now. The MC bit is only enabled when restoring register state, so enabling the trace event won't take immediate effect. Tracing guest mode changes can be particularly handy when trying to work out what a guest OS gets up to before something goes wrong, especially if the problem occurs as a result of some previous guest userland exception which would otherwise be invisible in the trace. Signed-off-by: -
James Hogan authored
Transfer timer state to the VZ guest context (CP0_GTOffset & guest CP0_Count) when entering guest mode, enabling direct guest access to it, and transfer back to soft timer when saving guest register state. This usually allows guest code to directly read CP0_Count (via MFC0 and RDHWR) and read/write CP0_Compare, without trapping to the hypervisor for it to emulate the guest timer. Writing to CP0_Count or CP0_Cause.DC is much less common and still triggers a hypervisor GPSI exception, in which case the timer state is transferred back to an hrtimer before emulating the write. We are careful to prevent small amounts of drift from building up due to undeterministic time intervals between reading of the ktime and reading of CP0_Count. Some drift is expected however, since the system clocksource may use a different timer to the local CP0_Count timer used by VZ. This is permitted to prevent guest CP0_Count from appearing to go backwards. Signed-off-by: -
James Hogan authored
Add emulation of Memory Accessibility Attribute Registers (MAARs) when necessary. We can't actually do anything with whatever the guest provides, but it may not be possible to clear Guest.Config5.MRP so we have to emulate at least a pair of MAARs. Signed-off-by: -
James Hogan authored
When restoring guest state after another VCPU has run, be sure to clear CP0_LLAddr.LLB in order to break any interrupted atomic critical section. Without this SMP guest atomics don't work when LLB is present as one guest can complete the atomic section started by another guest. MIPS VZ guest read of CP0_LLAddr causes Guest Privileged Sensitive Instruction (GPSI) exception due to the address being root physical. Handle this by reporting only the LLB bit, which contains the bit for whether a ll/sc atomic is in progress without any reason for failure. Similarly on P5600 a guest write to CP0_LLAddr also causes a GPSI exception. Handle this also by clearing the guest LLB bit from root mode. Signed-off-by: -
James Hogan authored
Add support for VZ guest CP0_PWBase, CP0_PWField, CP0_PWSize, and CP0_PWCtl registers for controlling the guest hardware page table walker (HTW) present on P5600 and P6600 cores. These guest registers need initialising on R6, context switching, and exposing via the KVM ioctl API when they are present. Signed-off-by: -
James Hogan authored
Add support for VZ guest CP0_SegCtl0, CP0_SegCtl1, and CP0_SegCtl2 registers, as found on P5600 and P6600 cores. These guest registers need initialising, context switching, and exposing via the KVM ioctl API when they are present. They also require the GVA -> GPA translation code for handling a GVA root exception to be updated to interpret the segmentation registers and decode the faulting instruction enough to detect EVA memory access instructions. Signed-off-by: -
James Hogan authored
Add support for VZ guest CP0_ContextConfig and CP0_XContextConfig (MIPS64 only) registers, as found on P5600 and P6600 cores. These guest registers need initialising, context switching, and exposing via the KVM ioctl API when they are present. Signed-off-by: -
James Hogan authored
Add support for VZ guest CP0_BadInstr and CP0_BadInstrP registers, as found on most VZ capable cores. These guest registers need context switching, and exposing via the KVM ioctl API when they are present. Signed-off-by: -
James Hogan authored
Add support for the MIPS Virtualization (VZ) ASE to the MIPS KVM build system. For now KVM can only be configured for T&E or VZ and not both, but the design of the user facing APIs support the possibility of having both available, so this could change in future. Note that support for various optional guest features (some of which can't be turned off) are implemented in immediately following commits, so although it should now be possible to build VZ support, it may not work yet on your hardware. Signed-off-by: -
James Hogan authored
Add the main support for the MIPS Virtualization ASE (A.K.A. VZ) to MIPS KVM. The bulk of this work is in vz.c, with various new state and definitions elsewhere. Enough is implemented to be able to run on a minimal VZ core. Further patches will fill out support for guest features which are optional or can be disabled. Signed-off-by:
-
James Hogan authored
The general guest exit handler needs a few tweaks for VZ compared to trap & emulate, which for now are made directly depending on CONFIG_KVM_MIPS_VZ: - There is no need to re-enable the hardware page table walker (HTW), as it can be left enabled during guest mode operation with VZ. - There is no need to perform a privilege check, as any guest privilege violations should have already been detected by the hardware and triggered the appropriate guest exception. Signed-off-by: -
James Hogan authored
Ifdef out the trap & emulate CACHE instruction emulation functions for VZ. We will provide separate CACHE instruction emulation in vz.c, and we need to avoid linker errors due to the use of T&E specific MMU helpers. Signed-off-by: -
James Hogan authored
Update emulation of guest writes to CP0_Compare for VZ. There are two main differences compared to trap & emulate: - Writing to CP0_Compare in the VZ hardware guest context acks any pending timer, clearing CP0_Cause.TI. If we don't want an ack to take place we must carefully restore the TI bit if it was previously set. - Even with guest timer access disabled in CP0_GuestCtl0.GT, if the guest CP0_Count reaches the guest CP0_Compare the timer interrupt will assert. To prevent this we must set CP0_GTOffset to move the guest CP0_Count out of the way of the new guest CP0_Compare, either before or after depending on whether it is a forwards or backwards change. Signed-off-by:
-
