- 27 Apr, 2008 40 commits
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Christian Borntraeger authored
The address 0x11b8 is used by z/VM for pfault and diag 250 I/O to provide a 64 bit extint parameter. virtio uses the same address, so its time to update the lowcore structure. Acked-by:
Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
Carsten Otte <cotte@de.ibm.com> Signed-off-by:
Avi Kivity <avi@qumranet.com>
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Christian Borntraeger authored
This patch changes the s390 memory management defintions to use the pgste field for dirty and reference bit tracking of host and guest code. Usually on s390, dirty and referenced are tracked in storage keys, which belong to the physical page. This changes with virtualization: The guest and host dirty/reference bits are defined to be the logical OR of the values for the mapping and the physical page. This patch implements the necessary changes in pgtable.h for s390. There is a common code change in mm/rmap.c, the call to page_test_and_clear_young must be moved. This is a no-op for all architecture but s390. page_referenced checks the referenced bits for the physiscal page and for all mappings: o The physical page is checked with page_test_and_clear_young. o The mappings are checked with ptep_test_and_clear_young and friends. Without pgstes (the current implementation on Linux s390) the physical page check is implemented but the mapping callbacks are no-ops because dirty and referenced are not tracked in the s390 page tables. The pgstes introduces guest and host dirty and reference bits for s390 in the host mapping. These mapping must be checked before page_test_and_clear_young resets the reference bit. Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
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Carsten Otte authored
The SIE instruction on s390 uses the 2nd half of the page table page to virtualize the storage keys of a guest. This patch offers the s390_enable_sie function, which reorganizes the page tables of a single-threaded process to reserve space in the page table: s390_enable_sie makes sure that the process is single threaded and then uses dup_mm to create a new mm with reorganized page tables. The old mm is freed and the process has now a page status extended field after every page table. Code that wants to exploit pgstes should SELECT CONFIG_PGSTE. This patch has a small common code hit, namely making dup_mm non-static. Edit (Carsten): I've modified Martin's patch, following Jeremy Fitzhardinge's review feedback. Now we do have the prototype for dup_mm in include/linux/sched.h. Following Martin's suggestion, s390_enable_sie() does now call task_lock() to prevent race against ptrace modification of mm_users. Signed-off-by:
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Izik Eidus authored
This emulates the x86 hardware task switch mechanism in software, as it is unsupported by either vmx or svm. It allows operating systems which use it, like freedos, to run as kvm guests. Signed-off-by:
Izik Eidus <izike@qumranet.com> Signed-off-by:
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Izik Eidus authored
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Avi Kivity authored
Useful for debugging. Signed-off-by: -
Avi Kivity authored
Long overdue. Signed-off-by: -
Avi Kivity authored
Encapsulate the pte mask'n'shift in a function. Signed-off-by: -
Izik Eidus authored
When mmu_set_spte() checks if a page related to spte should be release as dirty or clean, it check if the shadow pte was writeble, but in case rmap_write_protect() is called called it is possible for shadow ptes that were writeble to become readonly and therefor mmu_set_spte will release the pages as clean. This patch fix this issue by marking the page as dirty inside rmap_write_protect(). Signed-off-by:
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Avi Kivity authored
Signed-off-by: -
Avi Kivity authored
If we populate a shadow pte due to a fault (and not speculatively due to a pte write) then we can set the accessed bit on it, as we know it will be set immediately on the next guest instruction. This saves a read-modify-write operation. Signed-off-by: -
Christian Borntraeger authored
include/linux/kvm.h defines struct kvm_dirty_log to [...] union { void __user *dirty_bitmap; /* one bit per page */ __u64 padding; }; __user requires compiler.h to compile. Currently, this works on x86 only coincidentally due to other include files. This patch makes kvm.h compile in all cases. Signed-off-by: -
Glauber Costa authored
This patch writes 0 (actually, what really matters is that the LSB is cleared) to the system time msr before shutting down the machine for kexec. Without it, we can have a random memory location being written when the guest comes back It overrides the functions shutdown, used in the path of kernel_kexec() (sys.c) and crash_shutdown, used in the path of crash_kexec() (kexec.c) Signed-off-by:
Glauber Costa <gcosta@redhat.com> Signed-off-by:
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Glauber Costa authored
it will allow external users to call it. It is mainly useful for routines that will override its machine_ops field for its own special purposes, but want to call the normal shutdown routine after they're done Signed-off-by:
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Glauber Costa authored
This patch a llows machine_crash_shutdown to be replaced, just like any of the other functions in machine_ops Signed-off-by:
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Marcelo Tosatti authored
Batch pte updates and tlb flushes in lazy MMU mode. [avi: - adjust to mmu_op - helper for getting para_state without debug warnings] Signed-off-by:
Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by:
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Marcelo Tosatti authored
Hypercall based pte updates are faster than faults, and also allow use of the lazy MMU mode to batch operations. Don't report the feature if two dimensional paging is enabled. [avi: - guest/host split - fix 32-bit truncation issues - adjust to mmu_op - adjust to ->release_*() renamed - add ->release_pud()] Signed-off-by:
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Marcelo Tosatti authored
Hypercall based pte updates are faster than faults, and also allow use of the lazy MMU mode to batch operations. Don't report the feature if two dimensional paging is enabled. [avi: - one mmu_op hypercall instead of one per op - allow 64-bit gpa on hypercall - don't pass host errors (-ENOMEM) to guest] [akpm: warning fix on i386] Signed-off-by:
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Avi Kivity authored
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Marcelo Tosatti authored
Add basic KVM paravirt support. Avoid vm-exits on IO delays. Signed-off-by:
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Marcelo Tosatti authored
Add basic KVM paravirt support. Avoid vm-exits on IO delays. Signed-off-by:
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Sheng Yang authored
Separate the reset part and prepare for reset support. Signed-off-by:
Sheng Yang <sheng.yang@intel.com> Signed-off-by:
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Sheng Yang authored
Signed-off-by:
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Sheng Yang authored
The patch moves the PIT model from userspace to kernel, and increases the timer accuracy greatly. [marcelo: make last_injected_time per-guest] Signed-off-by:
Alex Davis <alex14641@yahoo.com> Signed-off-by:
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Avi Kivity authored
The desc_struct changes left an unnecessary #ifdef; remove it. Signed-off-by: -
Avi Kivity authored
Most Intel hosts have a stable tsc, and playing with the offset only reduces accuracy. By limiting tsc offset adjustment only to forward updates, we effectively disable tsc offset adjustment on these hosts. Signed-off-by: -
Harvey Harrison authored
__FUNCTION__ is gcc-specific, use __func__ Signed-off-by:
Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by:
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Joerg Roedel authored
In the current inject_page_fault path KVM only checks if there is another PF pending and injects a DF then. But it has to check for a pending DF too to detect a shutdown condition in the VCPU. If this is not detected the VCPU goes to a PF -> DF -> PF loop when it should triple fault. This patch detects this condition and handles it with an KVM_SHUTDOWN exit to userspace. Signed-off-by:
Joerg Roedel <joerg.roedel@amd.com> Signed-off-by:
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Xiantao Zhang authored
Since the size of kvm_regs is too big to allocate from kernel stack on ia64, use kzalloc to allocate it. Signed-off-by:
Xiantao Zhang <xiantao.zhang@intel.com> Signed-off-by:
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Avi Kivity authored
Names like 'set_cr3()' look dangerously close to affecting the host. Signed-off-by: -
Marcelo Tosatti authored
Create large pages mappings if the guest PTE's are marked as such and the underlying memory is hugetlbfs backed. If the largepage contains write-protected pages, a large pte is not used. Gives a consistent 2% improvement for data copies on ram mounted filesystem, without NPT/EPT. Anthony measures a 4% improvement on 4-way kernbench, with NPT. Signed-off-by:
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Marcelo Tosatti authored
Mark zapped root pagetables as invalid and ignore such pages during lookup. This is a problem with the cr3-target feature, where a zapped root table fools the faulting code into creating a read-only mapping. The result is a lockup if the instruction can't be emulated. Signed-off-by:
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Alexander Graf authored
Darwin relies on this and ceases to work without. Signed-off-by:
Alexander Graf <alex@csgraf.de> Signed-off-by:
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Harvey Harrison authored
In two case statements, use the ever popular 'i' instead of index: arch/x86/kvm/x86.c:1063:7: warning: symbol 'index' shadows an earlier one arch/x86/kvm/x86.c:1000:9: originally declared here arch/x86/kvm/x86.c:1079:7: warning: symbol 'index' shadows an earlier one arch/x86/kvm/x86.c:1000:9: originally declared here Make it static. arch/x86/kvm/x86.c:1945:24: warning: symbol 'emulate_ops' was not declared. Should it be static? Drop the return statements. arch/x86/kvm/x86.c:2878:2: warning: returning void-valued expression arch/x86/kvm/x86.c:2944:2: warning: returning void-valued expression Signed-off-by:
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Harvey Harrison authored
Fixes sparse warning as well. arch/x86/kvm/svm.c:69:15: warning: symbol 'iopm_base' was not declared. Should it be static? Signed-off-by:
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Harvey Harrison authored
Nesting __emulate_2op_nobyte inside__emulate_2op produces many shadowed variable warnings on the internal variable _tmp used by both macros. Change the outer macro to use __tmp. Avoids a sparse warning like the following at every call site of __emulate_2op arch/x86/kvm/x86_emulate.c:1091:3: warning: symbol '_tmp' shadows an earlier one arch/x86/kvm/x86_emulate.c:1091:3: originally declared here [18 more warnings suppressed] Signed-off-by:
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Amit Shah authored
Signed-off-by:
Amit Shah <amit.shah@qumranet.com> Signed-off-by:
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Avi Kivity authored
The x86 desc_struct unification allows us to remove segment_descriptor.h. Signed-off-by: -
Avi Kivity authored
Signed-off-by: -
Avi Kivity authored
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