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IOMMU interrupt remapping support provides a further layer of
isolation for device assignment by preventing arbitrary interrupt
block DMA writes by a malicious guest from reaching the host. By
default, we should require that the platform provides interrupt
remapping support, with an opt-in mechanism for existing behavior.
Both AMD IOMMU and Intel VT-d2 hardware support interrupt
remapping, however we currently only have software support on
the Intel side. Users wishing to re-enable device assignment
when interrupt remapping is not supported on the platform can
use the "allow_unsafe_assigned_interrupts=1" module option.
[avi: break long lines]
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
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For 32bit machines where the physical address width is
larger than the virtual address width the frame number types
in KVM may overflow. Fix this by changing them to u64.
[sfr: fix build on 32-bit ppc]
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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This patch fixes the following warning.
===================================================
[ INFO: suspicious rcu_dereference_check() usage. ]
---------------------------------------------------
include/linux/kvm_host.h:259 invoked rcu_dereference_check() without
protection!
other info that might help us debug this:
rcu_scheduler_active = 1, debug_locks = 0
no locks held by qemu-system-x86/29679.
stack backtrace:
Pid: 29679, comm: qemu-system-x86 Not tainted 2.6.35-rc3+ #200
Call Trace:
[<ffffffff810a224e>] lockdep_rcu_dereference+0xa8/0xb1
[<ffffffffa018a06f>] kvm_iommu_unmap_memslots+0xc9/0xde [kvm]
[<ffffffffa018a0c4>] kvm_iommu_unmap_guest+0x40/0x4e [kvm]
[<ffffffffa018f772>] kvm_arch_destroy_vm+0x1a/0x186 [kvm]
[<ffffffffa01800d0>] kvm_put_kvm+0x110/0x167 [kvm]
[<ffffffffa0180ecc>] kvm_vcpu_release+0x18/0x1c [kvm]
[<ffffffff81156f5d>] fput+0x22a/0x3a0
[<ffffffff81152288>] filp_close+0xb4/0xcd
[<ffffffff8106599f>] put_files_struct+0x1b7/0x36b
[<ffffffff81065830>] ? put_files_struct+0x48/0x36b
[<ffffffff8131ee59>] ? do_raw_spin_unlock+0x118/0x160
[<ffffffff81065bc0>] exit_files+0x6d/0x75
[<ffffffff81068348>] do_exit+0x47d/0xc60
[<ffffffff8177e7b5>] ? _raw_spin_unlock_irq+0x30/0x36
[<ffffffff81068bfa>] do_group_exit+0xcf/0x134
[<ffffffff81080790>] get_signal_to_deliver+0x732/0x81d
[<ffffffff81095996>] ? cpu_clock+0x4e/0x60
[<ffffffff81002082>] do_notify_resume+0x117/0xc43
[<ffffffff810a2fa3>] ? trace_hardirqs_on+0xd/0xf
[<ffffffff81080d79>] ? sys_rt_sigtimedwait+0x2b5/0x3bf
[<ffffffff8177d9f2>] ? trace_hardirqs_off_thunk+0x3a/0x3c
[<ffffffff81003221>] ? sysret_signal+0x5/0x3d
[<ffffffff8100343b>] int_signal+0x12/0x17
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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Signed-off-by: Avi Kivity <avi@redhat.com>
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This is obviously a left-over from the the old interface taking the
size. Apparently a mostly harmless issue with the current iommu_unmap
implementation.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Acked-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
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* 'kvm-updates/2.6.35' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (269 commits)
KVM: x86: Add missing locking to arch specific vcpu ioctls
KVM: PPC: Add missing vcpu_load()/vcpu_put() in vcpu ioctls
KVM: MMU: Segregate shadow pages with different cr0.wp
KVM: x86: Check LMA bit before set_efer
KVM: Don't allow lmsw to clear cr0.pe
KVM: Add cpuid.txt file
KVM: x86: Tell the guest we'll warn it about tsc stability
x86, paravirt: don't compute pvclock adjustments if we trust the tsc
x86: KVM guest: Try using new kvm clock msrs
KVM: x86: export paravirtual cpuid flags in KVM_GET_SUPPORTED_CPUID
KVM: x86: add new KVMCLOCK cpuid feature
KVM: x86: change msr numbers for kvmclock
x86, paravirt: Add a global synchronization point for pvclock
x86, paravirt: Enable pvclock flags in vcpu_time_info structure
KVM: x86: Inject #GP with the right rip on efer writes
KVM: SVM: Don't allow nested guest to VMMCALL into host
KVM: x86: Fix exception reinjection forced to true
KVM: Fix wallclock version writing race
KVM: MMU: Don't read pdptrs with mmu spinlock held in mmu_alloc_roots
KVM: VMX: enable VMXON check with SMX enabled (Intel TXT)
...
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The RCU/SRCU API have already changed for proving RCU usage.
I got the following dmesg when PROVE_RCU=y because we used incorrect API.
This patch coverts rcu_deference() to srcu_dereference() or family API.
===================================================
[ INFO: suspicious rcu_dereference_check() usage. ]
---------------------------------------------------
arch/x86/kvm/mmu.c:3020 invoked rcu_dereference_check() without protection!
other info that might help us debug this:
rcu_scheduler_active = 1, debug_locks = 0
2 locks held by qemu-system-x86/8550:
#0: (&kvm->slots_lock){+.+.+.}, at: [<ffffffffa011a6ac>] kvm_set_memory_region+0x29/0x50 [kvm]
#1: (&(&kvm->mmu_lock)->rlock){+.+...}, at: [<ffffffffa012262d>] kvm_arch_commit_memory_region+0xa6/0xe2 [kvm]
stack backtrace:
Pid: 8550, comm: qemu-system-x86 Not tainted 2.6.34-rc4-tip-01028-g939eab1 #27
Call Trace:
[<ffffffff8106c59e>] lockdep_rcu_dereference+0xaa/0xb3
[<ffffffffa012f6c1>] kvm_mmu_calculate_mmu_pages+0x44/0x7d [kvm]
[<ffffffffa012263e>] kvm_arch_commit_memory_region+0xb7/0xe2 [kvm]
[<ffffffffa011a5d7>] __kvm_set_memory_region+0x636/0x6e2 [kvm]
[<ffffffffa011a6ba>] kvm_set_memory_region+0x37/0x50 [kvm]
[<ffffffffa015e956>] vmx_set_tss_addr+0x46/0x5a [kvm_intel]
[<ffffffffa0126592>] kvm_arch_vm_ioctl+0x17a/0xcf8 [kvm]
[<ffffffff810a8692>] ? unlock_page+0x27/0x2c
[<ffffffff810bf879>] ? __do_fault+0x3a9/0x3e1
[<ffffffffa011b12f>] kvm_vm_ioctl+0x364/0x38d [kvm]
[<ffffffff81060cfa>] ? up_read+0x23/0x3d
[<ffffffff810f3587>] vfs_ioctl+0x32/0xa6
[<ffffffff810f3b19>] do_vfs_ioctl+0x495/0x4db
[<ffffffff810e6b2f>] ? fget_light+0xc2/0x241
[<ffffffff810e416c>] ? do_sys_open+0x104/0x116
[<ffffffff81382d6d>] ? retint_swapgs+0xe/0x13
[<ffffffff810f3ba6>] sys_ioctl+0x47/0x6a
[<ffffffff810021db>] system_call_fastpath+0x16/0x1b
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
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This patch changes the implementation of of
kvm_iommu_map_pages to map the pages with the host page size
into the io virtual address space.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Acked-By: Avi Kivity <avi@redhat.com>
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Enable optional parameter (default 0) - PCI segment (or domain) besides
BDF, when assigning PCI device to guest.
Signed-off-by: Zhai Edwin <edwin.zhai@intel.com>
Acked-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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Use two steps for memslot deletion: mark the slot invalid (which stops
instantiation of new shadow pages for that slot, but allows destruction),
then instantiate the new empty slot.
Also simplifies kvm_handle_hva locking.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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So its possible to iommu map a memslot before making it visible to
kvm.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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Have a pointer to an allocated region inside struct kvm.
[alex: fix ppc book 3s]
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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Memory aliases with different memory type is a problem for guest. For the guest
without assigned device, the memory type of guest memory would always been the
same as host(WB); but for the assigned device, some part of memory may be used
as DMA and then set to uncacheable memory type(UC/WC), which would be a conflict of
host memory type then be a potential issue.
Snooping control can guarantee the cache correctness of memory go through the
DMA engine of VT-d.
[avi: fix build on ia64]
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
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kvm->slots_lock is outer to kvm->lock, so take slots_lock
in kvm_vm_ioctl_assign_device() before taking kvm->lock,
rather than taking it in kvm_iommu_map_memslots().
Cc: stable@kernel.org
Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Acked-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
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This fixes a compile warning about a variable thats maybe used
uninitialized in the function.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
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Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
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Impact: file renamed
The code in the vtd.c file can be reused for other IOMMUs as well. So
rename it to make it clear that it handle more than VT-d.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
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