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  1. 03 5月, 2007 16 次提交
    • A
      KVM: VMX: Properly shadow the CR0 register in the vcpu struct · 25c4c276
      由 Anthony Liguori 提交于 
      Set all of the host mask bits for CR0 so that we can maintain a proper
shadow of CR0.  This exposes CR0.TS, paving the way for lazy fpu handling.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      25c4c276
    • A
      KVM: Lazy FPU support for SVM · 7807fa6c
      由 Anthony Liguori 提交于 
      Avoid saving and restoring the guest fpu state on every exit.  This
shaves ~100 cycles off the guest/host switch.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      7807fa6c
    • A
      KVM: Per-vcpu statistics · 1165f5fe
      由 Avi Kivity 提交于 
      Make the exit statistics per-vcpu instead of global.  This gives a 3.5%
boost when running one virtual machine per core on my two socket dual core
(4 cores total) machine.
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      1165f5fe
    • A
      KVM: Use slab caches to allocate mmu data structures · b5a33a75
      由 Avi Kivity 提交于 
      Better leak detection, statistics, memory use, speed -- goodness all
around.
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      b5a33a75
    • A
      KVM: Add physical memory aliasing feature · e8207547
      由 Avi Kivity 提交于 
      With this, we can specify that accesses to one physical memory range will
be remapped to another.  This is useful for the vga window at 0xa0000 which
is used as a movable window into the (much larger) framebuffer.
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      e8207547
    • A
      KVM: Simply gfn_to_page() · 954bbbc2
      由 Avi Kivity 提交于 
      Mapping a guest page to a host page is a common operation.  Currently,
one has first to find the memory slot where the page belongs (gfn_to_memslot),
then locate the page itself (gfn_to_page()).

This is clumsy, and also won't work well with memory aliases.  So simplify
gfn_to_page() not to require memory slot translation first, and instead do it
internally.
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      954bbbc2
    • D
      KVM: Add mmu cache clear function · e0fa826f
      由 Dor Laor 提交于 
      Functions that play around with the physical memory map
need a way to clear mappings to possibly nonexistent or
invalid memory.  Both the mmu cache and the processor tlb
are cleared.
Signed-off-by: NDor Laor <dor.laor@qumranet.com>
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      e0fa826f
    • A
      KVM: SVM: Ensure timestamp counter monotonicity · 0cc5064d
      由 Avi Kivity 提交于 
      When a vcpu is migrated from one cpu to another, its timestamp counter
may lose its monotonic property if the host has unsynced timestamp counters.
This can confuse the guest, sometimes to the point of refusing to boot.

As the rdtsc instruction is rather fast on AMD processors (7-10 cycles),
we can simply record the last host tsc when we drop the cpu, and adjust
the vcpu tsc offset when we detect that we've migrated to a different cpu.
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      0cc5064d
    • A
      KVM: MMU: Fix hugepage pdes mapping same physical address with different access · d28c6cfb
      由 Avi Kivity 提交于 
      The kvm mmu keeps a shadow page for hugepage pdes; if several such pdes map
the same physical address, they share the same shadow page.  This is a fairly
common case (kernel mappings on i386 nonpae Linux, for example).

However, if the two pdes map the same memory but with different permissions, kvm
will happily use the cached shadow page.  If the access through the more
permissive pde will occur after the access to the strict pde, an endless pagefault
loop will be generated and the guest will make no progress.

Fix by making the access permissions part of the cache lookup key.

The fix allows Xen pae to boot on kvm and run guest domains.

Thanks to Jeremy Fitzhardinge for reporting the bug and testing the fix.
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      d28c6cfb
    • A
      KVM: Remove set_cr0_no_modeswitch() arch op · f6528b03
      由 Avi Kivity 提交于 
      set_cr0_no_modeswitch() was a hack to avoid corrupting segment registers.
As we now cache the protected mode values on entry to real mode, this
isn't an issue anymore, and it interferes with reboot (which usually _is_
a modeswitch).
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      f6528b03
    • A
      KVM: MMU: Remove global pte tracking · aac01224
      由 Avi Kivity 提交于 
      The initial, noncaching, version of the kvm mmu flushed the all nonglobal
shadow page table translations (much like a native tlb flush).  The new
implementation flushes translations only when they change, rendering global
pte tracking superfluous.

This removes the unused tracking mechanism and storage space.
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      aac01224
    • A
      KVM: Avoid guest virtual addresses in string pio userspace interface · 039576c0
      由 Avi Kivity 提交于 
      The current string pio interface communicates using guest virtual addresses,
relying on userspace to translate addresses and to check permissions.  This
interface cannot fully support guest smp, as the check needs to take into
account two pages at one in case an unaligned string transfer straddles a
page boundary.

Change the interface not to communicate guest addresses at all; instead use
a buffer page (mmaped by userspace) and do transfers there.  The kernel
manages the virtual to physical translation and can perform the checks
atomically by taking the appropriate locks.
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      039576c0
    • A
      KVM: Add guest mode signal mask · 1961d276
      由 Avi Kivity 提交于 
      Allow a special signal mask to be used while executing in guest mode.  This
allows signals to be used to interrupt a vcpu without requiring signal
delivery to a userspace handler, which is quite expensive.  Userspace still
receives -EINTR and can get the signal via sigwait().
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      1961d276
    • A
      KVM: Handle cpuid in the kernel instead of punting to userspace · 06465c5a
      由 Avi Kivity 提交于 
      KVM used to handle cpuid by letting userspace decide what values to
return to the guest.  We now handle cpuid completely in the kernel.  We
still let userspace decide which values the guest will see by having
userspace set up the value table beforehand (this is necessary to allow
management software to set the cpu features to the least common denominator,
so that live migration can work).

The motivation for the change is that kvm kernel code can be impacted by
cpuid features, for example the x86 emulator.
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      06465c5a
    • A
      KVM: Do not communicate to userspace through cpu registers during PIO · 46fc1477
      由 Avi Kivity 提交于 
      Currently when passing the a PIO emulation request to userspace, we
rely on userspace updating %rax (on 'in' instructions) and %rsi/%rdi/%rcx
(on string instructions).  This (a) requires two extra ioctls for getting
and setting the registers and (b) is unfriendly to non-x86 archs, when
they get kvm ports.

So fix by doing the register fixups in the kernel and passing to userspace
only an abstract description of the PIO to be done.
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      46fc1477
    • A
      KVM: Use a shared page for kernel/user communication when runing a vcpu · 9a2bb7f4
      由 Avi Kivity 提交于 
      Instead of passing a 'struct kvm_run' back and forth between the kernel and
userspace, allocate a page and allow the user to mmap() it.  This reduces
needless copying and makes the interface expandable by providing lots of
free space.
Signed-off-by: NAvi Kivity <avi@qumranet.com>
      9a2bb7f4
  3. 04 3月, 2007 4 次提交
  5. 13 2月, 2007 3 次提交
  7. 27 1月, 2007 1 次提交
  9. 06 1月, 2007 13 次提交
  11. 31 12月, 2006 3 次提交