linux.git/drivers/kvm/svm.c, branch v2.6.20

[PATCH] Fix "CONFIG_X86_64_" typo in drivers/kvm/svm.c

2007-01-30T16:26:45+00:00

Fix what looks like an obvious typo in the file drivers/kvm/svm.c.

Signed-off-by: Robert P. J. Day 
Acked-by: Avi Kivity 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] KVM: SVM: Propagate cpu shutdown events to userspace

2007-01-26T21:50:57+00:00

This patch implements forwarding of SHUTDOWN intercepts from the guest on to
userspace on AMD SVM.  A SHUTDOWN event occurs when the guest produces a
triple fault (e.g.  on reboot).  This also fixes the bug that a guest reboot
actually causes a host reboot under some circumstances.

Signed-off-by: Joerg Roedel 
Signed-off-by: Avi Kivity 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] KVM: SVM: Fix SVM idt confusion

2007-01-26T21:50:57+00:00

There's an obvious typo in svm_{get,set}_idt, causing it to access the ldt
instead.

Because these functions are only called for save/load on AMD, the bug does not
impact normal operation.  With the fix, save/load works as expected on AMD
hosts.

Signed-off-by: Uri Lublin 
Signed-off-by: Avi Kivity 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] KVM: fix race between mmio reads and injected interrupts

2007-01-23T15:52:06+00:00

The kvm mmio read path looks like:

 1. guest read faults
 2. kvm emulates read, calls emulator_read_emulated()
 3. fails as a read requires userspace help
 4. exit to userspace
 5. userspace emulates read, kvm sets vcpu->mmio_read_completed
 6. re-enter guest, fault again
 7. kvm emulates read, calls emulator_read_emulated()
 8. succeeds as vcpu->mmio_read_emulated is set
 9. instruction completes and guest is resumed

A problem surfaces if the userspace exit (step 5) also requests an interrupt
injection.  In that case, the guest does not re-execute the original
instruction, but the interrupt handler.  The next time an mmio read is
exectued (likely for a different address), step 3 will find
vcpu->mmio_read_completed set and return the value read for the original
instruction.

The problem manifested itself in a few annoying ways:
- little squares appear randomly on console when switching virtual terminals
- ne2000 fails under nfs read load
- rtl8139 complains about "pci errors" even though the device model is
  incapable of issuing them.

Fix by skipping interrupt injection if an mmio read is pending.

A better fix is to avoid re-entry into the guest, and re-emulating immediately
instead.  However that's a bit more complex.

Signed-off-by: Avi Kivity 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] KVM: add VM-exit profiling

2007-01-12T02:18:21+00:00

This adds the profile=kvm boot option, which enables KVM to profile VM
exits.

Use: "readprofile -m ./System.map | sort -n" to see the resulting
output:

   [...]
   18246 serial_out                               148.3415
   18945 native_flush_tlb                         378.9000
   23618 serial_in                                212.7748
   29279 __spin_unlock_irq                        622.9574
   43447 native_apic_write                        2068.9048
   52702 enable_8259A_irq                         742.2817
   54250 vgacon_scroll                             89.3740
   67394 ide_inb                                  6126.7273
   79514 copy_page_range                           98.1654
   84868 do_wp_page                                86.6000
  140266 pit_read                                 783.6089
  151436 ide_outb                                 25239.3333
  152668 native_io_delay                          21809.7143
  174783 mask_and_ack_8259A                       783.7803
  362404 native_set_pte_at                        36240.4000
 1688747 total                                      0.5009

Signed-off-by: Ingo Molnar 
Acked-by: Avi Kivity 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] KVM: Simplify test for interrupt window

2007-01-06T07:55:28+00:00

No need to test for rflags.if as both VT and SVM specs assure us that on exit
caused from interrupt window opening, 'if' is set.

Signed-off-by: Dor Laor 
Signed-off-by: Avi Kivity 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] KVM: MMU: Detect oom conditions and propagate error to userspace

2007-01-06T07:55:27+00:00

Signed-off-by: Avi Kivity 
Acked-by: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] KVM: MMU: Remove invlpg interception

2007-01-06T07:55:25+00:00

Since we write protect shadowed guest page tables, there is no need to trap
page invalidations (the guest will always change the mapping before issuing
the invlpg instruction).

Signed-off-by: Avi Kivity 
Acked-by: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] KVM: MMU: oom handling

2007-01-06T07:55:25+00:00

When beginning to process a page fault, make sure we have enough shadow pages
available to service the fault.  If not, free some pages.

Signed-off-by: Avi Kivity 
Acked-by: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] KVM: Prevent stale bits in cr0 and cr4

2007-01-06T07:55:23+00:00

Hardware virtualization implementations allow the guests to freely change some
of the bits in cr0 and cr4, but trap when changing the other bits.  This is
useful to avoid excessive exits due to changing, for example, the ts flag.

It also means the kvm's copy of cr0 and cr4 may be stale with respect to these
bits.  most of the time this doesn't matter as these bits are not very
interesting.  Other times, however (for example when returning cr0 to
userspace), they are, so get the fresh contents of these bits from the guest
by means of a new arch operation.

Signed-off-by: Avi Kivity 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds