linux-toradex.git/include/linux/kvm_host.h, branch v2.6.36-rc5

KVM: Convert mask notifiers to use irqchip/pin instead of gsi

2010-08-02T03:40:39+00:00

Devices register mask notifier using gsi, but irqchip knows about
irqchip/pin, so conversion from irqchip/pin to gsi should be done before
looking for mask notifier to call.

Signed-off-by: Gleb Natapov 
Signed-off-by: Marcelo Tosatti

KVM: Return EFAULT from kvm ioctl when guest accesses bad area

2010-08-02T03:40:33+00:00

Currently if guest access address that belongs to memory slot but is not
backed up by page or page is read only KVM treats it like MMIO access.
Remove that capability. It was never part of the interface and should
not be relied upon.

Signed-off-by: Gleb Natapov 
Signed-off-by: Avi Kivity

KVM: Keep slot ID in memory slot structure

2010-08-01T07:47:07+00:00

May be used for distinguishing between internal and user slots, or for sorting
slots in size order.

Signed-off-by: Avi Kivity

KVM: Reduce atomic operations on vcpu->requests

2010-08-01T07:47:06+00:00

Usually the vcpu->requests bitmap is sparse, so a test_and_clear_bit() for
each request generates a large number of unneeded atomics if a bit is set.

Replace with a separate test/clear sequence.  This is safe since there is
no clear_bit() outside the vcpu thread.

Signed-off-by: Avi Kivity

KVM: Add mini-API for vcpu->requests

2010-08-01T07:47:05+00:00

Makes it a little more readable and hackable.

Signed-off-by: Avi Kivity

KVM: Remove memory alias support

2010-08-01T07:47:00+00:00

As advertised in feature-removal-schedule.txt.  Equivalent support is provided
by overlapping memory regions.

Signed-off-by: Avi Kivity

KVM: VMX: Enable XSAVE/XRSTOR for guest

2010-08-01T07:46:31+00:00

This patch enable guest to use XSAVE/XRSTOR instructions.

We assume that host_xcr0 would use all possible bits that OS supported.

And we loaded xcr0 in the same way we handled fpu - do it as late as we can.

Signed-off-by: Dexuan Cui 
Signed-off-by: Sheng Yang 
Reviewed-by: Marcelo Tosatti 
Signed-off-by: Avi Kivity

KVM: Get rid of KVM_REQ_KICK

2010-08-01T07:35:37+00:00

KVM_REQ_KICK poisons vcpu->requests by having a bit set during normal
operation.  This causes the fast path check for a clear vcpu->requests
to fail all the time, triggering tons of atomic operations.

Fix by replacing KVM_REQ_KICK with a vcpu->guest_mode atomic.

Signed-off-by: Avi Kivity

KVM: Avoid killing userspace through guest SRAO MCE on unmapped pages

2010-08-01T07:35:26+00:00

In common cases, guest SRAO MCE will cause corresponding poisoned page
be un-mapped and SIGBUS be sent to QEMU-KVM, then QEMU-KVM will relay
the MCE to guest OS.

But it is reported that if the poisoned page is accessed in guest
after unmapping and before MCE is relayed to guest OS, userspace will
be killed.

The reason is as follows. Because poisoned page has been un-mapped,
guest access will cause guest exit and kvm_mmu_page_fault will be
called. kvm_mmu_page_fault can not get the poisoned page for fault
address, so kernel and user space MMIO processing is tried in turn. In
user MMIO processing, poisoned page is accessed again, then userspace
is killed by force_sig_info.

To fix the bug, kvm_mmu_page_fault send HWPOISON signal to QEMU-KVM
and do not try kernel and user space MMIO processing for poisoned
page.

[xiao: fix warning introduced by avi]

Reported-by: Max Asbock 
Signed-off-by: Huang Ying 
Signed-off-by: Xiao Guangrong 
Signed-off-by: Marcelo Tosatti 
Signed-off-by: Avi Kivity

KVM: Let vcpu structure alignment be determined at runtime

2010-05-19T08:36:29+00:00

vmx and svm vcpus have different contents and therefore may have different
alignmment requirements.  Let each specify its required alignment.

Signed-off-by: Avi Kivity