- 31 Dec, 2008 40 commits
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Xiantao Zhang authored
Since vmm runs in an isolated address space and it is just a copy of host's kvm-intel module, so once vmm crashes, we just crash all guests running on it instead of crashing whole kernel. Signed-off-by:
Xiantao Zhang <xiantao.zhang@intel.com> Signed-off-by:
Avi Kivity <avi@redhat.com>
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Xiantao Zhang authored
Use printk infrastructure to print out some debug info once VM crashes. Signed-off-by:
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Xiantao Zhang authored
kvm-intel module is relocated to an isolated address space with kernel, so it can't call host kernel's printk for debug purpose. In the module, we implement the printk to output debug info of vmm. Signed-off-by:
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Eduardo Habkost authored
On emergency_restart, we may need to use an NMI to disable virtualization on all CPUs. We do that using nmi_shootdown_cpus() if VMX is enabled. Note: With this patch, we will run the NMI stuff only when the CPU where emergency_restart() was called has VMX enabled. This should work on most cases because KVM enables VMX on all CPUs, but we may miss the small window where KVM is doing that. Also, I don't know if all code using VMX out there always enable VMX on all CPUs like KVM does. We have two other alternatives for that: a) Have an API that all code that enables VMX on any CPU should use to tell the kernel core that it is going to enable VMX on the CPUs. b) Always call nmi_shootdown_cpus() if the CPU supports VMX. This is a bit intrusive and more risky, as it would run nmi_shootdown_cpus() on emergency_reboot() even on systems where virtualization is never enabled. Finding a proper point to hook the nmi_shootdown_cpus() call isn't trivial, as the non-emergency machine_restart() (that doesn't need the NMI tricks) uses machine_emergency_restart() directly. The solution to make this work without adding a new function or argument to machine_ops was setting a 'reboot_emergency' flag that tells if native_machine_emergency_restart() needs to do the virt cleanup or not. Signed-off-by:
Eduardo Habkost <ehabkost@redhat.com> Signed-off-by:
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Eduardo Habkost authored
We need to disable virtualization extensions on all CPUs before booting the kdump kernel, otherwise the kdump kernel booting will fail, and rebooting after the kdump kernel did its task may also fail. We do it using cpu_emergency_vmxoff() and cpu_emergency_svm_disable(), that should always work, because those functions check if the CPUs support SVM or VMX before doing their tasks. Signed-off-by:
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Eduardo Habkost authored
This function can be used by the reboot or kdump code to forcibly disable SVM on the CPU. Signed-off-by:
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Eduardo Habkost authored
Create cpu_svm_disable() function. Signed-off-by:
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Eduardo Habkost authored
Use a trick to keep the printk()s on has_svm() working as before. gcc will take care of not generating code for the 'msg' stuff when the function is called with a NULL msg argument. Signed-off-by:
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Eduardo Habkost authored
Add cpu_emergency_vmxoff() and its friends: cpu_vmx_enabled() and __cpu_emergency_vmxoff(). Signed-off-by:
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Eduardo Habkost authored
Along with some comments on why it is different from the core cpu_vmxoff() function. Signed-off-by:
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Eduardo Habkost authored
Unfortunately we can't use exactly the same code from vmx hardware_disable(), because the KVM function uses the __kvm_handle_fault_on_reboot() tricks. Signed-off-by:
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Eduardo Habkost authored
It will be used by core code on kdump and reboot, to disable vmx if needed. Signed-off-by:
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Eduardo Habkost authored
Those definitions will be used by code outside KVM, so move it outside of a KVM-specific source file. Those definitions are used only on kvm/vmx.c, that already includes asm/vmx.h, so they can be moved safely. Signed-off-by:
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Eduardo Habkost authored
svm.h will be used by core code that is independent of KVM, so I am moving it outside the arch/x86/kvm directory. Signed-off-by:
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Eduardo Habkost authored
vmx.h will be used by core code that is independent of KVM, so I am moving it outside the arch/x86/kvm directory. Signed-off-by:
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Hollis Blanchard authored
We used to defer invalidating userspace TLB entries until jumping out of the kernel. This was causing MMU weirdness most easily triggered by using a pipe in the guest, e.g. "dmesg | tail". I believe the problem was that after the guest kernel changed the PID (part of context switch), the old process's mappings were still present, and so copy_to_user() on the "return to new process" path ended up using stale mappings. Testing with large pages (64K) exposed the problem, probably because with 4K pages, pressure on the TLB faulted all process A's mappings out before the guest kernel could insert any for process B. Signed-off-by:
Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by:
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Hollis Blanchard authored
Bare metal Linux on 440 can "overmap" RAM in the kernel linear map, so that it can use large (256MB) mappings even if memory isn't a multiple of 256MB. To prevent the hardware prefetcher from loading from an invalid physical address through that mapping, it's marked Guarded. However, KVM must ensure that all guest mappings are backed by real physical RAM (since a deliberate access through a guarded mapping could still cause a machine check). Accordingly, we don't need to make our mappings guarded, so let's allow prefetching as the designers intended. Curiously this patch didn't affect performance at all on the quick test I tried, but it's clearly the right thing to do anyways and may improve other workloads. Signed-off-by:
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Hollis Blanchard authored
We have an accessor; might as well use it. Signed-off-by:
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Sheng Yang authored
Commit 7fd49de9773fdcb7b75e823b21c1c5dc1e218c14 "KVM: ensure that memslot userspace addresses are page-aligned" broke kernel space allocated memory slot, for the userspace_addr is invalid. Signed-off-by:
Sheng Yang <sheng@linux.intel.com> Signed-off-by:
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Xiantao Zhang authored
Use kernel's corresponding macro instead. Signed-off-by:
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Hollis Blanchard authored
Make sure that CONFIG_KVM cannot be selected without processor support (currently, 440 is the only processor implementation available). Signed-off-by:
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Hollis Blanchard authored
Bad page translation and silent guest failure ensue if the userspace address is not page-aligned. I hit this problem using large (host) pages with qemu, because qemu currently has a hardcoded 4096-byte alignment for guest memory allocations. Signed-off-by:
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Nitin A Kamble authored
The code to traverse the cpuid data array list for counting type of leaves is currently broken. This patches fixes the 2 things in it. 1. Set the 1st counting entry's flag KVM_CPUID_FLAG_STATE_READ_NEXT. Without it the code will never find a valid entry. 2. Also the stop condition in the for loop while looking for the next unflaged entry is broken. It needs to stop when it find one matching entry; and in the case of count of 1, it will be the same entry found in this iteration. Signed-Off-By:Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by:
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Nitin A Kamble authored
For cpuid leaf 0xb the bits 8-15 in ECX register define the end of counting leaf. The previous code was using bits 0-7 for this purpose, which is a bug. Signed-off-by:
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Hollis Blanchard authored
set ESR[PTR] when emulating a guest trap. This allows Linux guests to properly handle WARN_ON() (i.e. detect that it's a non-fatal trap). Also remove debugging printk in trap emulation. Signed-off-by:
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Hollis Blanchard authored
In kvmppc_deliver_interrupt is just one case left in the switch and it is a rare one (less than 8%) when looking at the exit numbers. Therefore we can at least drop the switch/case and if an if. I inserted an unlikely too, but that's open for discussion. In kvmppc_can_deliver_interrupt all frequent cases are in the default case. I know compilers are smart but we can make it easier for them. By writing down all options and removing the default case combined with the fact that ithe values are constants 0..15 should allow the compiler to write an easy jump table. Modifying kvmppc_can_deliver_interrupt pointed me to the fact that gcc seems to be unable to reduce priority_exception[x] to a build time constant. Therefore I changed the usage of the translation arrays in the interrupt delivery path completely. It is now using priority without translation to irq on the full irq delivery path. To be able to do that ivpr regs are stored by their priority now. Additionally the decision made in kvmppc_can_deliver_interrupt is already sufficient to get the value of interrupt_msr_mask[x]. Therefore we can replace the 16x4byte array used here with a single 4byte variable (might still be one miss, but the chance to find this in cache should be better than the right entry of the whole array). Signed-off-by:
Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> Signed-off-by:
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Hollis Blanchard authored
Since we use a unsigned long here anyway we can use the optimized __ffs. Signed-off-by:
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Hollis Blanchard authored
Currently we use an unnecessary if&switch to detect some cases. To be honest we don't need the ligh_exits counter anyway, because we can calculate it out of others. Sum_exits can also be calculated, so we can remove that too. MMIO, DCR and INTR can be counted on other places without these additional control structures (The INTR case was never hit anyway). The handling of BOOKE_INTERRUPT_EXTERNAL/BOOKE_INTERRUPT_DECREMENTER is similar, but we can avoid the additional if when copying 3 lines of code. I thought about a goto there to prevent duplicate lines, but rewriting three lines should be better style than a goto cross switch/case statements (its also not enough code to justify a new inline function). Signed-off-by:
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Hollis Blanchard authored
When changing some msr bits e.g. problem state we need to take special care of that. We call the function in our mtmsr emulation (not needed for wrtee[i]), but we don't call kvmppc_set_msr if we change msr via set_regs ioctl. It's a corner case we never hit so far, but I assume it should be kvmppc_set_msr in our arch set regs function (I found it because it is also a corner case when using pv support which would miss the update otherwise). Signed-off-by:
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Hollis Blanchard authored
However, some of these fields could be split into separate per-core structures in the future. Signed-off-by:
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Hollis Blanchard authored
This patch doesn't yet move all 44x-specific data into the new structure, but is the first step down that path. In the future we may also want to create a struct kvm_vcpu_booke. Based on patch from Liu Yu <yu.liu@freescale.com>. Signed-off-by:
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Hollis Blanchard authored
Needed to port to other Book E processors. Signed-off-by:
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Hollis Blanchard authored
Cores provide 3 emulation hooks, implemented for example in the new 4xx_emulate.c: kvmppc_core_emulate_op kvmppc_core_emulate_mtspr kvmppc_core_emulate_mfspr Strictly speaking the last two aren't necessary, but provide for more informative error reporting ("unknown SPR"). Long term I'd like to have instruction decoding autogenerated from tables of opcodes, and that way we could aggregate universal, Book E, and core-specific instructions more easily and without redundant switch statements. Signed-off-by: -
Hollis Blanchard authored
This is used in a couple places in KVM, but isn't KVM-specific. However, this patch doesn't modify other in-kernel emulation code: - xmon uses a direct copy of ppc_opc.c from binutils - emulate_instruction() doesn't need it because it can use a series of mask tests. Signed-off-by:
Paul Mackerras <paulus@samba.org> Signed-off-by:
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Hollis Blanchard authored
This introduces a set of core-provided hooks. For 440, some of these are implemented by booke.c, with the rest in (the new) 44x.c. Note that these hooks are link-time, not run-time. Since it is not possible to build a single kernel for both e500 and 440 (for example), using function pointers would only add overhead. Signed-off-by:
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Hollis Blanchard authored
The division was somewhat artificial and cumbersome, and had no functional benefit anyways: we can only guests built for the real host processor. Signed-off-by:
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Hollis Blanchard authored
This will ease ports to other cores. Also remove unused "struct kvm_tlb" while we're at it. Signed-off-by:
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Hollis Blanchard authored
This will make it easier to provide implementations for other cores. Signed-off-by:
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Izik Eidus authored
Some areas of kvm x86 mmu are using gfn offset inside a slot without unaliasing the gfn first. This patch makes sure that the gfn will be unaliased and add gfn_to_memslot_unaliased() to save the calculating of the gfn unaliasing in case we have it unaliased already. Signed-off-by:
Izik Eidus <ieidus@redhat.com> Acked-by:
Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by:
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Sheng Yang authored
Ideally, every assigned device should in a clear condition before and after assignment, so that the former state of device won't affect later work. Some devices provide a mechanism named Function Level Reset, which is defined in PCI/PCI-e document. We should execute it before and after device assignment. (But sadly, the feature is new, and most device on the market now don't support it. We are considering using D0/D3hot transmit to emulate it later, but not that elegant and reliable as FLR itself.) [Update: Reminded by Xiantao, execute FLR after we ensure that the device can be assigned to the guest.] Signed-off-by:
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