- 17 Jun, 2015 4 commits
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Kim Phillips authored
The KVM-VFIO device is used by the QEMU VFIO device. It is used to record the list of in-use VFIO groups so that KVM can manipulate them. Signed-off-by:
Kim Phillips <kim.phillips@linaro.org> Signed-off-by:
Eric Auger <eric.auger@linaro.org> Signed-off-by:
Marc Zyngier <marc.zyngier@arm.com>
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Christoffer Dall authored
Until now we have been calling kvm_guest_exit after re-enabling interrupts when we come back from the guest, but this has the unfortunate effect that CPU time accounting done in the context of timer interrupts occurring while the guest is running doesn't properly notice that the time since the last tick was spent in the guest. Inspired by the comment in the x86 code, move the kvm_guest_exit() call below the local_irq_enable() call and change __kvm_guest_exit() to kvm_guest_exit(), because we are now calling this function with interrupts enabled. We have to now explicitly disable preemption and not enable preemption before we've called kvm_guest_exit(), since otherwise we could be preempted and everything happening before we eventually get scheduled again would be accounted for as guest time. At the same time, move the trace_kvm_exit() call outside of the atomic section, since there is no reason for us to do that with interrupts disabled. Signed-off-by:
Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by:
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Tiejun Chen authored
We already check KVM_CAP_IRQFD in generic once enable CONFIG_HAVE_KVM_IRQFD, kvm_vm_ioctl_check_extension_generic() | + switch (arg) { + ... + #ifdef CONFIG_HAVE_KVM_IRQFD + case KVM_CAP_IRQFD: + #endif + ... + return 1; + ... + } | + kvm_vm_ioctl_check_extension() So its not necessary to check this in arch again, and also fix one typo, s/emlation/emulation. Signed-off-by:Tiejun Chen <tiejun.chen@intel.com> Acked-by:
Paolo Bonzini <pbonzini@redhat.com> Signed-off-by:
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Marc Zyngier authored
On VM entry, we disable access to the VFP registers in order to perform a lazy save/restore of these registers. On VM exit, we restore access, test if we did enable them before, and save/restore the guest/host registers if necessary. In this sequence, the FPEXC register is always accessed, irrespective of the trapping configuration. If the guest didn't touch the VFP registers, then the HCPTR access has now enabled such access, but we're missing a barrier to ensure architectural execution of the new HCPTR configuration. If the HCPTR access has been delayed/reordered, the subsequent access to FPEXC will cause a trap, which we aren't prepared to handle at all. The same condition exists when trapping to enable VFP for the guest. The fix is to introduce a barrier after enabling VFP access. In the vmexit case, it can be relaxed to only takes place if the guest hasn't accessed its view of the VFP registers, making the access to FPEXC safe. The set_hcptr macro is modified to deal with both vmenter/vmexit and vmtrap operations, and now takes an optional label that is branched to when the guest hasn't touched the VFP registers. Reported-by:
Vikram Sethi <vikrams@codeaurora.org> Cc: stable@kernel.org # v3.9+ Signed-off-by:
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- 09 Jun, 2015 2 commits
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Andre Przywara authored
Commit 47a98b15 ("arm/arm64: KVM: support for un-queuing active IRQs") introduced handling of the GICD_I[SC]ACTIVER registers, but only for the GICv2 emulation. For the sake of completeness and as this is a pre-requisite for save/restore of the GICv3 distributor state, we should also emulate their handling in the distributor and redistributor frames of an emulated GICv3. Acked-by:
Andre Przywara <andre.przywara@arm.com> Signed-off-by:
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Firo Yang authored
No need to cast the void pointer returned by kmalloc() in arch/arm/kvm/mmu.c::kvm_alloc_stage2_pgd(). Signed-off-by:
Firo Yang <firogm@gmail.com> Acked-by:
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- 19 May, 2015 16 commits
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Paolo Bonzini authored
gfn_to_pfn_async is used in just one place, and because of x86-specific treatment that place will need to look at the memory slot. Hence inline it into try_async_pf and export __gfn_to_pfn_memslot. The patch also switches the subsequent call to gfn_to_pfn_prot to use __gfn_to_pfn_memslot. This is a small optimization. Finally, remove the now-unused async argument of __gfn_to_pfn. Signed-off-by: -
Paolo Bonzini authored
The argument to KVM_GET_DIRTY_LOG is a memslot id; it may not match the position in the memslots array, which is sorted by gfn. Cc: stable@vger.kernel.org Reviewed-by:
James Hogan <james.hogan@imgtec.com> Signed-off-by:
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Xiao Guangrong authored
CR0.CD and CR0.NW are not used by shadow page table so that need not adjust mmu if these two bit are changed Signed-off-by:
Xiao Guangrong <guangrong.xiao@linux.intel.com> Signed-off-by:
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Xiao Guangrong authored
Currently, whenever guest MTRR registers are changed kvm_mmu_reset_context is called to switch to the new root shadow page table, however, it's useless since: 1) the cache type is not cached into shadow page's attribute so that the original root shadow page will be reused 2) the cache type is set on the last spte, that means we should sync the last sptes when MTRR is changed This patch fixs this issue by drop all the spte in the gfn range which is being updated by MTRR Signed-off-by:
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Xiao Guangrong authored
There are some bugs in current get_mtrr_type(); 1: bit 1 of mtrr_state->enabled is corresponding bit 11 of IA32_MTRR_DEF_TYPE MSR which completely control MTRR's enablement that means other bits are ignored if it is cleared 2: the fixed MTRR ranges are controlled by bit 0 of mtrr_state->enabled (bit 10 of IA32_MTRR_DEF_TYPE) 3: if MTRR is disabled, UC is applied to all of physical memory rather than mtrr_state->def_type Signed-off-by:
Wanpeng Li <wanpeng.li@linux.intel.com> Signed-off-by:
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Xiao Guangrong authored
Split kvm_unmap_rmapp and introduce kvm_zap_rmapp which will be used in the later patch Signed-off-by:
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Xiao Guangrong authored
slot_handle_level and its helper functions are ready now, use them to clean up the code Signed-off-by:
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Xiao Guangrong authored
There are several places walking all rmaps for the memslot so that introduce common functions to cleanup the code Signed-off-by:
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Xiao Guangrong authored
It's used to abstract the code from kvm_handle_hva_range and it will be used by later patch Signed-off-by:
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Xiao Guangrong authored
Suggested-by:
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Xiao Guangrong authored
It's used to walk all the sptes on the rmap to clean up the code Signed-off-by:
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Paolo Bonzini authored
This reverts commit ff7bbb9c. Sasha Levin is seeing odd jump in time values during boot of a KVM guest: [...] [ 0.000000] tsc: Detected 2260.998 MHz processor [3376355.247558] Calibrating delay loop (skipped) preset value.. [...] and bisected them to this commit. Reported-by:
Sasha Levin <sasha.levin@oracle.com> Signed-off-by:
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Xiao Guangrong authored
KVM may turn a user page to a kernel page when kernel writes a readonly user page if CR0.WP = 1. This shadow page entry will be reused after SMAP is enabled so that kernel is allowed to access this user page Fix it by setting SMAP && !CR0.WP into shadow page's role and reset mmu once CR4.SMAP is updated Signed-off-by:
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Nadav Amit authored
When a REP-string is executed in 64-bit mode with an address-size prefix, ECX/EDI/ESI are used as counter and pointers. When ECX is initially zero, Intel CPUs clear the high 32-bits of RCX, and recent Intel CPUs update the high bits of the pointers in MOVS/STOS. This behavior is specific to Intel according to few experiments. As one may guess, this is an undocumented behavior. Yet, it is observable in the guest, since at least VMX traps REP-INS/OUTS even when ECX=0. Note that VMware appears to get it right. The behavior can be observed using the following code: #include <stdio.h> #define LOW_MASK (0xffffffff00000000ull) #define ALL_MASK (0xffffffffffffffffull) #define TEST(opcode) \ do { \ asm volatile(".byte 0xf2 \n\t .byte 0x67 \n\t .byte " opcode "\n\t" \ : "=S"(s), "=c"(c), "=D"(d) \ : "S"(ALL_MASK), "c"(LOW_MASK), "D"(ALL_MASK)); \ printf("opcode %s rcx=%llx rsi=%llx rdi=%llx\n", \ opcode, c, s, d); \ } while(0) void main() { unsigned long long s, d, c; iopl(3); TEST("0x6c"); TEST("0x6d"); TEST("0x6e"); TEST("0x6f"); TEST("0xa4"); TEST("0xa5"); TEST("0xa6"); TEST("0xa7"); TEST("0xaa"); TEST("0xab"); TEST("0xae"); TEST("0xaf"); } Signed-off-by:Nadav Amit <namit@cs.technion.ac.il> Signed-off-by:
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Nadav Amit authored
When REP-string instruction is preceded with an address-size prefix, ECX/EDI/ESI are used as the operation counter and pointers. When they are updated, the high 32-bits of RCX/RDI/RSI are cleared, similarly to the way they are updated on every 32-bit register operation. Fix it. Signed-off-by:
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Nadav Amit authored
If the host sets hardware breakpoints to debug the guest, and a task-switch occurs in the guest, the architectural DR7 will not be updated. The effective DR7 would be updated instead. This fix puts the DR7 update during task-switch emulation, so it now uses the standard DR setting mechanism instead of the one that was previously used. As a bonus, the update of DR7 will now be effective for AMD as well. Signed-off-by:
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- 11 May, 2015 1 commit
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Paolo Bonzini authored
Merge tag 'kvm-s390-next-20150508' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD KVM: s390: Fixes and features for 4.2 (kvm/next) Mostly a bunch of fixes, reworks and optimizations for s390. There is one new feature (EDAT-2 inside the guest), which boils down to 2GB pages.
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- 08 May, 2015 15 commits
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David Hildenbrand authored
Our implementation will never trigger interception code 12 as the responsible setting is never enabled - and never will be. The handler is dead code. Let's get rid of it. Reviewed-by:
Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by:
David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com>
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David Hildenbrand authored
This patch factors out the search for a floating irq destination VCPU as well as the kicking of the found VCPU. The search is optimized in the following ways: 1. stopped VCPUs can't take any floating interrupts, so try to find an operating one. We have to take care of the special case where all VCPUs are stopped and we don't have any valid destination. 2. use online_vcpus, not KVM_MAX_VCPU. This speeds up the search especially if KVM_MAX_VCPU is increased one day. As these VCPU objects are initialized prior to increasing online_vcpus, we can be sure that they exist. Reviewed-by:
Dominik Dingel <dingel@linux.vnet.ibm.com> Reviewed-by:
Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by:
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Jens Freimann authored
We can avoid checking guest control registers and guest PSW as well as all the masking and calculations on the interrupt masks when no interrupts are pending. Also, the check for IRQ_PEND_COUNT can be removed, because we won't enter the while loop if no interrupts are pending and invalid interrupt types can't be injected. Signed-off-by:
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Christian Borntraeger authored
Some updates to the control blocks need to be done in a way that ensures that no CPU is within SIE. Provide wrappers around the s390_vcpu_block functions and adopt the TOD migration code to update in a guaranteed fashion. Also rename these functions to have the kvm_s390_ prefix as everything else. Signed-off-by:
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Christian Borntraeger authored
exit_sie_sync is used to kick CPUs out of SIE and prevent reentering at any point in time. This is used to reload the prefix pages and to set the IBS stuff in a way that guarantees that after this function returns we are no longer in SIE. All current users trigger KVM requests. The request must be set before we block the CPUs to avoid races. Let's make this implicit by adding the request into a new function kvm_s390_sync_requests that replaces exit_sie_sync and split out s390_vcpu_block and s390_vcpu_unblock, that can be used to keep CPUs out of SIE independent of requests. Signed-off-by:
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Guenther Hutzl authored
1. Enable EDAT2 in the list of KVM facilities 2. Handle 2G frames in pfmf instruction If we support EDAT2, we may enable handling of 2G frames if not in 24 bit mode. 3. Enable EDAT2 in sie_block If the EDAT2 facility is available we enable GED2 mode control in the sie_block. Reviewed-by:
Guenther Hutzl <hutzl@linux.vnet.ibm.com> Signed-off-by:
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Guenther Hutzl authored
We should only enable EDAT1 for the guest if the host actually supports it and the cpu model for the guest has EDAT-1 enabled. Reviewed-by:
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Christian Borntraeger authored
The fast path for a sie exit is that no kvm reqest is pending. Make an early check to skip all single bit checks. Reviewed-by:
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David Hildenbrand authored
Commit ea5f4969 ("KVM: s390: only one external call may be pending at a time") introduced a bug on machines that don't have SIGP interpretation facility installed. The injection of an external call will now always fail with -EBUSY (if none is already pending). This leads to the following symptoms: - An external call will be injected but with the wrong "src cpu id", as this id will not be remembered. - The target vcpu will not be woken up, therefore the guest will hang if it cannot deal with unexpected failures of the SIGP EXTERNAL CALL instruction. - If an external call is already pending, -EBUSY will not be reported. Reviewed-by:
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Paolo Bonzini authored
smep_andnot_wp is initialized in kvm_init_shadow_mmu and shadow pages should not be reused for different values of it. Thus, it has to be added to the mask in kvm_mmu_pte_write. Reviewed-by:
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Xiao Guangrong authored
Current permission check assumes that RSVD bit in PFEC is always zero, however, it is not true since MMIO #PF will use it to quickly identify MMIO access Fix it by clearing the bit if walking guest page table is needed Signed-off-by:
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Heiko Carstens authored
On cpu hotplug only KVM emits an unconditional message that its notifier has been called. It certainly can be assumed that calling cpu hotplug notifiers work, therefore there is no added value if KVM prints a message. If an error happens on cpu online KVM will still emit a warning. So let's remove this superfluous message. Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
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Jan Kiszka authored
vcpu->arch.apic is NULL when a userspace irqchip is active. But instead of letting the test incorrectly depend on in-kernel irqchip mode, open-code it to catch also userspace x2APICs. Signed-off-by:
Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by:
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Nadav Amit authored
Far call in 64-bit has a 32-bit operand size. Remove the marking of this operation as Stack so it can be emulated correctly in 64-bit. Signed-off-by:
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Radim Krčmář authored
Caching memslot value and using mark_page_dirty_in_slot() avoids another O(log N) search when dirtying the page. Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com> Message-Id: <1428695247-27603-1-git-send-email-rkrcmar@redhat.com> Signed-off-by:
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- 07 May, 2015 2 commits
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Paolo Bonzini authored
Code and format roughly based on Xen's vmcs_dump_vcpu. Signed-off-by: -
Marcelo Tosatti authored
Drop unnecessary rdtsc_barrier(), as has been determined empirically, see 057e6a8c for details. Noticed by Andy Lutomirski. Improves clock_gettime() by approximately 15% on Intel i7-3520M @ 2.90GHz. Signed-off-by:
Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by:
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