linux-toradex.git/drivers/kvm, branch v2.6.20.19

[PATCH] KVM: SVM: Reliably detect if SVM was disabled by BIOS

2007-08-25T15:24:02+00:00

This patch adds an implementation to the svm is_disabled function to
detect reliably if the BIOS disabled the SVM feature in the CPU. This
fixes the issues with kernel panics when loading the kvm-amd module on
machines where SVM is available but disabled.

Signed-off-by: Joerg Roedel 
Signed-off-by: Avi Kivity 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Willy Tarreau

KVM: MMU: Fix host memory corruption on i386 with >= 4GB ram

2007-05-02T00:05:54+00:00

PAGE_MASK is an unsigned long, so using it to mask physical addresses on
i386 (which are 64-bit wide) leads to truncation.  This can result in
page->private of unrelated memory pages being modified, with disasterous
results.

Fix by not using PAGE_MASK for physical addresses; instead calculate
the correct value directly from PAGE_SIZE.  Also fix a similar BUG_ON().

Acked-by: Ingo Molnar 
Signed-off-by: Avi Kivity 
Signed-off-by: Greg Kroah-Hartman

KVM: MMU: Fix guest writes to nonpae pde

2007-05-02T00:05:54+00:00

KVM shadow page tables are always in pae mode, regardless of the guest
setting.  This means that a guest pde (mapping 4MB of memory) is mapped
to two shadow pdes (mapping 2MB each).

When the guest writes to a pte or pde, we intercept the write and emulate it.
We also remove any shadowed mappings corresponding to the write.  Since the
mmu did not account for the doubling in the number of pdes, it removed the
wrong entry, resulting in a mismatch between shadow page tables and guest
page tables, followed shortly by guest memory corruption.

This patch fixes the problem by detecting the special case of writing to
a non-pae pde and adjusting the address and number of shadow pdes zapped
accordingly.

Acked-by: Ingo Molnar 
Signed-off-by: Avi Kivity 
Signed-off-by: Greg Kroah-Hartman

kvm: Fix asm constraint for lldt instruction

2007-03-09T18:50:30+00:00

lldt does not accept immediate operands, which "g" allows.

Signed-off-by: S.Caglar Onur 
Signed-off-by: Avi Kivity 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Greg Kroah-Hartman

[PATCH] KVM: fix lockup on 32-bit intel hosts with nx disabled in the bios

2007-02-02T00:22:41+00:00

Intel hosts, without long mode, and with nx support disabled in the bios
have an efer that is readable but not writable.  This causes a lockup on
switch to guest mode (even though it should exit with reason 34 according
to the documentation).

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

[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: MMU: Report nx faults to the guest

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

With the recent guest page fault change, we perform access checks on our
own instead of relying on the cpu.  This means we have to perform the nx
checks as well.

Software like the google toolbar on windows appears to rely on this
somehow.

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

[PATCH] KVM: MMU: Perform access checks in walk_addr()

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

Check pte permission bits in walk_addr(), instead of scattering the checks all
over the code.  This has the following benefits:

1. We no longer set the accessed bit for accessed which fail permission checks.
2. Setting the accessed bit is simplified.
3. Under some circumstances, we used to pretend a page fault was fixed when
   it would actually fail the access checks.  This caused an unnecessary
   vmexit.
4. The error code for guest page faults is now correct.

The fix helps netbsd further along booting, and allows kvm to pass the new mmu
testsuite.

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

[PATCH] KVM: Emulate IA32_MISC_ENABLE msr

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

This allows netbsd 3.1 i386 to get further along installing.

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