- 28 Jul, 2014 13 commits
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Michael Neuling authored
This adds support for the H_SET_MODE hcall. This hcall is a multiplexer that has several functions, some of which are called rarely, and some which are potentially called very frequently. Here we add support for the functions that set the debug registers CIABR (Completed Instruction Address Breakpoint Register) and DAWR/DAWRX (Data Address Watchpoint Register and eXtension), since they could be updated by the guest as often as every context switch. This also adds a kvmppc_power8_compatible() function to test to see if a guest is compatible with POWER8 or not. The CIABR and DAWR/X only exist on POWER8. Signed-off-by:
Michael Neuling <mikey@neuling.org> Signed-off-by:
Paul Mackerras <paulus@samba.org> Signed-off-by:
Alexander Graf <agraf@suse.de>
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Paul Mackerras authored
This adds code to check that when the KVM_CAP_PPC_ENABLE_HCALL capability is used to enable or disable in-kernel handling of an hcall, that the hcall is actually implemented by the kernel. If not an EINVAL error is returned. This also checks the default-enabled list of hcalls and prints a warning if any hcall there is not actually implemented. Signed-off-by:
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Paul Mackerras authored
This provides a way for userspace controls which sPAPR hcalls get handled in the kernel. Each hcall can be individually enabled or disabled for in-kernel handling, except for H_RTAS. The exception for H_RTAS is because userspace can already control whether individual RTAS functions are handled in-kernel or not via the KVM_PPC_RTAS_DEFINE_TOKEN ioctl, and because the numeric value for H_RTAS is out of the normal sequence of hcall numbers. Hcalls are enabled or disabled using the KVM_ENABLE_CAP ioctl for the KVM_CAP_PPC_ENABLE_HCALL capability on the file descriptor for the VM. The args field of the struct kvm_enable_cap specifies the hcall number in args[0] and the enable/disable flag in args[1]; 0 means disable in-kernel handling (so that the hcall will always cause an exit to userspace) and 1 means enable. Enabling or disabling in-kernel handling of an hcall is effective across the whole VM. The ability for KVM_ENABLE_CAP to be used on a VM file descriptor on PowerPC is new, added by this commit. The KVM_CAP_ENABLE_CAP_VM capability advertises that this ability exists. When a VM is created, an initial set of hcalls are enabled for in-kernel handling. The set that is enabled is the set that have an in-kernel implementation at this point. Any new hcall implementations from this point onwards should not be added to the default set without a good reason. No distinction is made between real-mode and virtual-mode hcall implementations; the one setting controls them both. Signed-off-by:
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Mihai Caraman authored
On vcpu schedule, the condition checked for tlb pollution is too loose. The tlb entries of a vcpu become polluted (vs stale) only when a different vcpu within the same logical partition runs in-between. Optimize the tlb invalidation condition keeping last_vcpu per logical partition id. With the new invalidation condition, a guest shows 4% performance improvement on P5020DS while running a memory stress application with the cpu oversubscribed, the other guest running a cpu intensive workload. Guest - old invalidation condition real 3.89 user 3.87 sys 0.01 Guest - enhanced invalidation condition real 3.75 user 3.73 sys 0.01 Host real 3.70 user 1.85 sys 0.00 The memory stress application accesses 4KB pages backed by 75% of available TLB0 entries: char foo[ENTRIES][4096] __attribute__ ((aligned (4096))); int main() { char bar; int i, j; for (i = 0; i < ITERATIONS; i++) for (j = 0; j < ENTRIES; j++) bar = foo[j][0]; return 0; } Signed-off-by:Mihai Caraman <mihai.caraman@freescale.com> Reviewed-by:
Scott Wood <scottwood@freescale.com> Signed-off-by:
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Alexander Graf authored
While sending sparse with endian checks over the code base, it triggered at some places that were missing casts or had wrong types. Fix them up. Signed-off-by: -
Alexander Graf authored
We switched to ABIv2 on Little Endian systems now which gets rid of the dotted function names. Branch to the actual functions when we see such a system. Signed-off-by: -
Anton Blanchard authored
Both kvmppc_hv_entry_trampoline and kvmppc_entry_trampoline are assembly functions that are exported to modules and also require a valid r2. As such we need to use _GLOBAL_TOC so we provide a global entry point that establishes the TOC (r2). Signed-off-by:
Anton Blanchard <anton@samba.org> Signed-off-by:
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Anton Blanchard authored
To establish addressability quickly, ABIv2 requires the target address of the function being called to be in r12. Signed-off-by:
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Alexander Graf authored
If we're running PR KVM in HV mode, we may get hypervisor doorbell interrupts. Handle those the same way we treat normal doorbells. Signed-off-by: -
Alexander Graf authored
Some compilers complain about uninitialized variables in the compute_tlbie_rb function. When you follow the code path you'll realize that we'll never get to that point, but the compiler isn't all that smart. So just default to 4k page sizes for everything, making the compiler happy and the code slightly easier to read. Signed-off-by:
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Alexander Graf authored
When we're using PR KVM we must not allow the CPU to take interrupts in virtual mode, as the SLB does not contain host kernel mappings when running inside the guest context. To make sure we get good performance for non-KVM tasks but still properly functioning PR KVM, let's just disable AIL whenever a vcpu is scheduled in. This is fundamentally different from how we deal with AIL on pSeries type machines where we disable AIL for the whole machine as soon as a single KVM VM is up. The reason for that is easy - on pSeries we do not have control over per-cpu configuration of AIL. We also don't want to mess with CPU hotplug races and AIL configuration, so setting it per CPU is easier and more flexible. This patch fixes running PR KVM on POWER8 bare metal for me. Signed-off-by:
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Aneesh Kumar K.V authored
Writing to IC is not allowed in the privileged mode. Signed-off-by:
Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by:
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Aneesh Kumar K.V authored
virtual time base register is a per VM, per cpu register that needs to be saved and restored on vm exit and entry. Writing to VTB is not allowed in the privileged mode. Signed-off-by:
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- 06 Jul, 2014 1 commit
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Aneesh Kumar K.V authored
We use time base for PURR and SPURR emulation with PR KVM since we are emulating a single threaded core. When using time base we need to make sure that we don't accumulate time spent in the host in PURR and SPURR value. Also we don't need to emulate mtspr because both the registers are hypervisor resource. Signed-off-by:
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- 30 Jun, 2014 11 commits
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Rickard Strandqvist authored
A struct member variable is set to the same value more than once This was found using a static code analysis program called cppcheck. Signed-off-by:
Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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Deng-Cheng Zhu authored
It's impossible to fall into the error handling of the TLB index after being masked by (KVM_MIPS_GUEST_TLB_SIZE - 1). Remove the dead code. Reported-by:
James Hogan <james.hogan@imgtec.com> Signed-off-by:
Deng-Cheng Zhu <dengcheng.zhu@imgtec.com> Reviewed-by:
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Deng-Cheng Zhu authored
The commpage is allocated using kzalloc(), so there's no need of cleaning the memory of the kvm_mips_commpage struct and its internal mips_coproc. Reviewed-by:
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Deng-Cheng Zhu authored
Since all the files are in arch/mips/kvm/, there's no need of the prefixes "kvm_" and "kvm_mips_". Reviewed-by:
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Deng-Cheng Zhu authored
The keyword volatile for idx in the TLB functions is unnecessary. Reviewed-by:
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Deng-Cheng Zhu authored
No logic changes inside. Reviewed-by:
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Deng-Cheng Zhu authored
Replace printks with kvm_[err|info|debug]. Signed-off-by:
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Deng-Cheng Zhu authored
No logic changes inside. Signed-off-by:
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Paolo Bonzini authored
Merge tag 'kvms390-20140626' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD Fix sie.h header related problems introduced during the 3.16 development cycle.
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Paolo Bonzini authored
Fix bad x86 regression introduced during merge window.
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Jan Kiszka authored
We import the CPL via SS.DPL since ae9fedc7. However, we fail to export it this way so far. This caused spurious guest crashes, e.g. of Linux when accessing the vmport from guest user space which triggered register saving/restoring to/from host user space. Signed-off-by:
Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by:
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- 26 Jun, 2014 1 commit
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Heiko Carstens authored
sie.h was missing in arch/s390/include/uapi/asm/Kbuild and therefore missed the "make headers_check" target. If added it reveals that also arch/s390/include/asm/sigp.h would become uapi. This is something we certainly do not want. So remove that dependency as well. The header file was merged with ceae283b "KVM: s390: add sie exit reasons tables", therefore we never had a kernel release with this commit and can still change anything. Acked-by:
Alexander Yarygin <yarygin@linux.vnet.ibm.com> Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Cornelia Huck <cornelia.huck@de.ibm.com>
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- 19 Jun, 2014 14 commits
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Nadav Amit authored
VMX instructions use 32-bit operands in 32-bit mode, and 64-bit operands in 64-bit mode. The current implementation is broken since it does not use the register operands correctly, and always uses 64-bit for reads and writes. Moreover, write to memory in vmwrite only considers long-mode, so it ignores cs.l. This patch fixes this behavior. Signed-off-by:
Nadav Amit <namit@cs.technion.ac.il> Signed-off-by:
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Nadav Amit authored
On 32-bit mode only bits [31:0] of the CR should be used for setting the CR value. Otherwise, the host may incorrectly assume the value is invalid if bits [63:32] are not zero. Moreover, the CR is currently being read twice when CR8 is used. Last, nested mov-cr exiting is modified to handle the CR value correctly as well. Signed-off-by:
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Nadav Amit authored
Currently, the hypercall handling routine only considers LME as an indication to whether the guest uses 32/64-bit mode. This is incosistent with hyperv hypercalls handling and against the common sense of considering cs.l as well. This patch uses is_64_bit_mode instead of is_long_mode for that matter. In addition, the result is masked in respect to the guest execution mode. Last, it changes kvm_hv_hypercall to use is_64_bit_mode as well to simplify the code. Signed-off-by:
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Nadav Amit authored
When the guest sets DR6 and DR7, KVM asserts the high 32-bits are clear, and otherwise injects a #GP exception. This exception should only be injected only if running in long-mode. Signed-off-by:
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Jan Kiszka authored
Many real CPUs get this wrong as well, but ours is totally off: bits 9:1 define the highest index value. Signed-off-by:
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Jan Kiszka authored
Allow L1 to "leak" its debug controls into L2, i.e. permit cleared VM_{ENTRY_LOAD,EXIT_SAVE}_DEBUG_CONTROLS. This requires to manually transfer the state of DR7 and IA32_DEBUGCTLMSR from L1 into L2 as both run on different VMCS. Signed-off-by: -
Jan Kiszka authored
SDM says bits 1, 4-6, 8, 13-16, and 26 have to be set. Signed-off-by:
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Jan Kiszka authored
We already have this control enabled by exposing a broken MSR_IA32_VMX_PROCBASED_CTLS value. This will properly advertise our capability once the value is fixed by clearing the right bits in MSR_IA32_VMX_TRUE_PROCBASED_CTLS. We also have to ensure to test the right value on L2 entry. Signed-off-by:
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Jan Kiszka authored
We already implemented them but failed to advertise them. Currently they all return the identical values to the capability MSRs they are augmenting. So there is no change in exposed features yet. Drop related comments at this chance that are partially incorrect and redundant anyway. Signed-off-by:
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Jan Kiszka authored
The spec says those controls are at bit position 2 - makes 4 as value. The impact of this mistake is effectively zero as we only use them to ensure that these features are set at position 2 (or, previously, 1) in MSR_IA32_VMX_{EXIT,ENTRY}_CTLS - which is and will be always true according to the spec. Signed-off-by: -
Nadav Amit authored
On long-mode the current NOP (0x90) emulation still writes back to RAX. As a result, EAX is zero-extended and the high 32-bits of RAX are cleared. Signed-off-by:
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Nadav Amit authored
Even if the condition of cmov is not satisfied, bits[63:32] should be cleared. This is clearly stated in Intel's CMOVcc documentation. The solution is to reassign the destination onto itself if the condition is unsatisfied. For that matter the original destination value needs to be read. Signed-off-by:
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Nadav Amit authored
Return unhandlable error on inter-privilege level ret instruction. This is since the current emulation does not check the privilege level correctly when loading the CS, and does not pop RSP/SS as needed. Cc: stable@vger.kernel.org Signed-off-by:
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Nadav Amit authored
The emulator does not emulate the xadd instruction correctly if the two operands are the same. In this (unlikely) situation the result should be the sum of X and X (2X) when it is currently X. The solution is to first perform writeback to the source, before writing to the destination. The only instruction which should be affected is xadd, as the other instructions that perform writeback to the source use the extended accumlator (e.g., RAX:RDX). Signed-off-by:
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