On 04/27/2010 09:17 AM, Gleb Natapov wrote:
The fact that 2.6.33.3 does not generate this makes me wonder why it
obviously lacks the above patch. Not required or not yet queued?
Doesn't make much sense to include it in stable-32, but not stable-33. I
think stable-32 just has more
On 04/27/2010 01:36 AM, Anthony Liguori wrote:
A few comments:
1) The problem was not block watermark itself but generating a
notification on the watermark threshold. It's a heuristic and should
be implemented based on polling block stats.
Polling for an event that never happens is bad
On 04/27/2010 11:48 AM, Dor Laor wrote:
Here's another option: an nbd-like protocol that remotes all BlockDriver
operations except read and write over a unix domain socket. The open
operation returns an fd (SCM_RIGHTS strikes again) that is used for read
and write. This can be used to implement
On 04/27/2010 12:08 PM, Dor Laor wrote:
On 04/27/2010 11:56 AM, Avi Kivity wrote:
On 04/27/2010 11:48 AM, Dor Laor wrote:
Here's another option: an nbd-like protocol that remotes all
BlockDriver
operations except read and write over a unix domain socket. The open
operation returns an fd
On 04/27/2010 12:16 PM, Kevin Wolf wrote:
Am 27.04.2010 10:56, schrieb Avi Kivity:
On 04/27/2010 11:48 AM, Dor Laor wrote:
Here's another option: an nbd-like protocol that remotes all BlockDriver
operations except read and write over a unix domain socket. The open
operation returns
On 04/27/2010 12:25 PM, Huang Ying wrote:
On 04/27/2010 10:04 AM, Huang Ying wrote:
+static void kvm_send_hwpoison_signal(struct kvm *kvm, gfn_t gfn)
+{
+ char buf[1];
+ void __user *hva;
+ int r;
+
+ /* Touch the page, so send SIGBUS */
+ hva = (void
On 04/27/2010 01:38 PM, Joerg Roedel wrote:
This patch changes the tdp_enabled flag from its global
meaning to the mmu-context and renames it to direct_map
there. This is necessary for Nested SVM with emulation of
Nested Paging where we need an extra MMU context to shadow
the Nested Nested Page
On 04/27/2010 01:38 PM, Joerg Roedel wrote:
This patch introduces a mmu-callback to translate gpa
addresses in the walk_addr code. This is later used to
translate l2_gpa addresses into l1_gpa addresses.
+static inline gfn_t gpa_to_gfn(gpa_t gpa)
+{
+ return (gfn_t)gpa PAGE_SHIFT;
+}
+
On 04/27/2010 01:38 PM, Joerg Roedel wrote:
This patch adds the functions to do a nested l2_gva to
l1_gpa page table walk.
Signed-off-by: Joerg Roedeljoerg.roe...@amd.com
---
arch/x86/include/asm/kvm_host.h |4
arch/x86/kvm/mmu.c |8
On 04/27/2010 01:38 PM, Joerg Roedel wrote:
This patch adds a function which can read from the guests
physical memory or from the guest's guest physical memory.
This will be used in the two-dimensional page table walker.
Signed-off-by: Joerg Roedeljoerg.roe...@amd.com
---
On 04/27/2010 01:38 PM, Joerg Roedel wrote:
This patch introduces the kvm_read_guest_page_x86 function
which reads from the physical memory of the guest. If the
guest is running in guest-mode itself with nested paging
enabled it will read from the guest's guest physical memory
instead.
The patch
On 04/27/2010 01:38 PM, Joerg Roedel wrote:
This patch introduces two fields in vcpu_arch for x86:
* fault_address
* fault_error_code
This will be used to correctly propagate page faults back
into the guest when we could have either an ordinary page
fault or a nested page
On 04/27/2010 01:38 PM, Joerg Roedel wrote:
This patch adds code to initialize the Nested Nested Paging
MMU context when the L1 guest executes a VMRUN instruction
and has nested paging enabled in its VMCB.
struct kvm_mmu_page *sp,
diff --git a/arch/x86/kvm/svm.c
On 04/27/2010 01:38 PM, Joerg Roedel wrote:
Hi,
this is the second and reworked version of my nested paging for nested svm
patchset. Changes to the previous version include:
* Renamed mmu.tdp_enabled to mmu.direct_map
* Introduced two helper functions to read physical memory
On 04/27/2010 04:03 PM, Anthony Liguori wrote:
On 04/27/2010 03:14 AM, Avi Kivity wrote:
On 04/27/2010 01:36 AM, Anthony Liguori wrote:
A few comments:
1) The problem was not block watermark itself but generating a
notification on the watermark threshold. It's a heuristic and
should
On 04/26/2010 12:58 PM, Takuya Yoshikawa wrote:
Although we always allocate a new dirty bitmap in x86's get_dirty_log(),
it is only used as a zero-source of copy_to_user() and freed right after
that when memslot is clean. This patch uses clear_user() instead of doing
this unnecessary zero-source
On 04/27/2010 04:28 PM, Joerg Roedel wrote:
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index d9dfc8c..8426870 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -298,6 +298,9 @@ struct kvm_vcpu_arch {
/* Used for
On 04/27/2010 03:42 PM, Avi Kivity wrote:
+{
+gfn_t real_gfn;
+gpa_t gpa;
+
+*error = 0;
+gpa = gfn PAGE_SHIFT;
This overflows too :)
Use gfn_to_gpa().
+real_gfn = mmu-translate_gpa(vcpu, gpa, error);
Overflow: sizeof(gpa) sizeof(gfn).
--
error compiling
On 04/27/2010 04:57 PM, Joerg Roedel wrote:
But the nested guest can use pae paging and generate a #NPF with
exit_info_2 4GB. So we need to keep the full fault address; if we
truncate, the guest might actually resolve the fault and let the
nested guest continue.
This could only be a
On 04/27/2010 06:40 PM, Joerg Roedel wrote:
Currently its a bit unclear when to use mmu or nested_mmu. With a
pointer it would be unclear to the code reader when to use the pointer
and when to select the mmu_contexts directly.
I think in most cases you'd want full translation, thus the
On 04/27/2010 04:40 PM, Marcelo Tosatti wrote:
On Mon, Apr 26, 2010 at 01:46:28PM -0400, Glauber Costa wrote:
If the HV told us we can fully trust the TSC, skip any
correction
Please drop this. Its not certain what is the best method to reduce
contention on the global variable.
On 04/26/2010 08:46 PM, Glauber Costa wrote:
This patch removes one padding byte and transform it into a flags
field. New versions of guests using pvclock will query these flags
upon each read.
Flags, however, will only be interpreted when the guest decides to.
It uses the pvclock_valid_flags
On 04/26/2010 08:46 PM, Glauber Costa wrote:
Since we're changing the msrs kvmclock uses, we have to communicate
that to the guest, through cpuid. We can add a new KVM_CAP to the
hypervisor, and then patch userspace to recognize it.
And if we ever add a new cpuid bit in the future, we have to
On 04/27/2010 10:09 PM, Glauber Costa wrote:
Hmm. We already have an API to get cpuid bits:
KVM_GET_SUPPORTED_CPUID2. The nice thing about it is that it will
mean -cpu host will work out of the box.
Ok, from what I understand, KVM_GET_CPUID2 gets a set of features, and tells
userspace
On 04/27/2010 03:15 PM, Gleb Natapov wrote:
Make set_cr() callback return error if it fails instead of injecting #GP
behind emulator's back.
-void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
+static int _kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{
standard
On 04/27/2010 03:15 PM, Gleb Natapov wrote:
This initialization is no longer needed.
Signed-off-by: Gleb Natapovg...@redhat.com
---
arch/x86/kvm/x86.c |2 --
1 files changed, 0 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ed15b20..29e2d3b
On 04/27/2010 03:15 PM, Gleb Natapov wrote:
Use callbacks from x86_emulate_ops to access segments instead of calling
into kvm directly.
-static unsigned long seg_base(struct x86_emulate_ctxt *ctxt, int seg)
+static unsigned long seg_base(struct x86_emulate_ctxt *ctxt,
+
On 04/28/2010 07:37 AM, Gerhard Wiesinger wrote:
Hello,
I saw that KVM git repository is not updated from QEMU repository very
often. Is it possible to integrate QEMU git tree into KVM git
regularly as qemu git tree is very dynamic. E.g. last commit was more
than 2 weeks ago. I think it is
On 04/28/2010 05:56 AM, Huang Ying wrote:
Just want to use the side effect of copy_from_user, SIGBUS will be sent
to current process because the page touched is marked as poisoned. That
is, failure is expected, so the return value is not checked.
What if the failure doesn't
On 04/27/2010 03:15 PM, Gleb Natapov wrote:
Return error to x86 emulator instead of injection exception behind its back.
Signed-off-by: Gleb Natapovg...@redhat.com
---
arch/x86/include/asm/kvm_emulate.h |3 +++
arch/x86/kvm/emulate.c | 12 +++-
arch/x86/kvm/x86.c
On 04/28/2010 07:17 AM, Takuya Yoshikawa wrote:
(2010/04/27 22:46), Takuya Yoshikawa wrote:
(2010/04/27 22:18), Avi Kivity wrote:
Furthermore, the reduced allocations seem to produce good effects for
other cases too. Actually, I observed that the time for the ioctl was
more stable than
On 04/28/2010 06:54 AM, Xiao Guangrong wrote:
Changlog v3:
Reviewed-by: Avi Kivity a...@redhat.com
--
error compiling committee.c: too many arguments to function
--
To unsubscribe from this list: send the line unsubscribe kvm in
the body of a message to majord...@vger.kernel.org
More
On 04/27/2010 04:46 PM, Takuya Yoshikawa wrote:
(2010/04/27 22:18), Avi Kivity wrote:
Furthermore, the reduced allocations seem to produce good effects for
other cases too. Actually, I observed that the time for the ioctl was
more stable than the original one and the average time for dirty
On 04/28/2010 01:52 PM, Joerg Roedel wrote:
On Tue, Apr 27, 2010 at 03:34:10PM +0300, Avi Kivity wrote:
On 04/27/2010 01:38 PM, Joerg Roedel wrote:
This patch introduces a mmu-callback to translate gpa
addresses in the walk_addr code. This is later used to
translate l2_gpa addresses
On 04/28/2010 02:03 PM, Joerg Roedel wrote:
On Tue, Apr 27, 2010 at 03:34:10PM +0300, Avi Kivity wrote:
On 04/27/2010 01:38 PM, Joerg Roedel wrote:
This patch introduces a mmu-callback to translate gpa
addresses in the walk_addr code. This is later used to
translate l2_gpa addresses
On 04/28/2010 02:57 PM, Lai Jiangshan wrote:
I think users will enable tdp when their hardwares support ept or npt.
This patch can reduce about 50% kvm mmu memory usage for they.
Good one!
--
error compiling committee.c: too many arguments to function
--
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Some guest msr values cannot be used on the host (for example. EFER.NX=0),
so we need to switch them atomically during guest entry or exit.
Add a facility to program the vmx msr autoload registers accordingly.
Signed-off-by: Avi Kivity a...@redhat.com
---
arch/x86/kvm/vmx.c | 49
Signed-off-by: Avi Kivity a...@redhat.com
---
arch/x86/include/asm/vmx.h |4
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index 4497318..9e6779f 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm
Signed-off-by: Avi Kivity a...@redhat.com
---
arch/x86/include/asm/vmx.h |8 +++-
1 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index fb9a080..4497318 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include
When EPT is enabled, we cannot emulate EFER.NX=0 through the shadow page
tables. This causes accesses through ptes with bit 63 set to succeed instead
of failing a reserved bit check.
Signed-off-by: Avi Kivity a...@redhat.com
---
arch/x86/kvm/vmx.c | 11 +++
1 files changed, 11
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 a...@redhat.com
---
arch/ia64/kvm/vmm.c |2 +-
arch/powerpc/kvm/44x.c|2 +-
arch/powerpc/kvm/book3s.c |3
the complications described above.
Avi Kivity (5):
KVM: Let vcpu structure alignment be determined at runtime
KVM: VMX: Add definition for msr autoload entry
KVM: VMX: Add definitions for guest and host EFER autoswitch vmcs
entries
KVM: VMX: Add facility to atomically switch MSRs on guest entry/exit
Signed-off-by: Avi Kivity a...@redhat.com
---
kvm/user/test/x86/access.c | 60 +++-
1 files changed, 37 insertions(+), 23 deletions(-)
diff --git a/kvm/user/test/x86/access.c b/kvm/user/test/x86/access.c
index dbc1213..0906691 100644
--- a/kvm/user/test
Signed-off-by: Avi Kivity a...@redhat.com
---
kvm/user/test/x86/access.c | 10 --
1 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/kvm/user/test/x86/access.c b/kvm/user/test/x86/access.c
index 5eadff8..dbc1213 100644
--- a/kvm/user/test/x86/access.c
+++ b/kvm/user/test/x86
Some processors only set accessed bits if the translation is valid; allow
this behaviour. This squelchs errors running with EPT.
Signed-off-by: Avi Kivity a...@redhat.com
---
kvm/user/test/x86/access.c | 25 -
1 files changed, 20 insertions(+), 5 deletions(-)
diff
There are so many tests, no point in reporting successful ones. Leave the
capability optional in case a failure triggers a kvm or testsuite crash before
the report is complete and we need to see which test failed.
Signed-off-by: Avi Kivity a...@redhat.com
---
kvm/user/test/x86/access.c | 15
Bit 4 of the page-fault error code can only be set if efer.nx=1.
Signed-off-by: Avi Kivity a...@redhat.com
---
kvm/user/test/x86/access.c |2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/kvm/user/test/x86/access.c b/kvm/user/test/x86/access.c
index 5addd15..3338fbc
On 04/28/2010 09:08 AM, Huang Ying wrote:
There is some test script and document for this in:
git://git.kernel.org/pub/scm/utils/cpu/mce/mce-test.git
test script is in kvm directory, testing document is kvm/README
This is a good candidate for kvm-autotest. We'll get little user
On 04/30/2010 05:25 AM, Lai Jiangshan wrote:
It's unrelated to TDP, same issue with shadow. I think the calculation
is correct. For example the 4th spte for a level=2 page will yield
gfn=4*512.
Avi, Marcelo
Thank you very much.
The calculation I used is correct.
Yes. btw, can
On 04/30/2010 12:00 PM, Xiao Guangrong wrote:
It has race in invlpg code, like below sequences:
A: hold mmu_lock and get 'sp'
B: release mmu_lock and do other things
C: hold mmu_lock and continue use 'sp'
if other path freed 'sp' in stage B, then kernel will crash
This patch checks 'sp'
On 04/30/2010 12:03 PM, Xiao Guangrong wrote:
Allow new shadow page become unsync when is created, then we no need
write-protect the 'sp-gfn', this idea is from Avi:
|Another interesting case is to create new shadow pages in the unsync
|state. That can help when the guest starts a short lived
On 04/30/2010 11:54 AM, Lai Jiangshan wrote:
Avi Kivity wrote:
On 04/30/2010 05:25 AM, Lai Jiangshan wrote:
It's unrelated to TDP, same issue with shadow. I think the calculation
is correct. For example the 4th spte for a level=2 page will yield
gfn=4*512.
Avi
On 04/28/2010 07:15 PM, Gleb Natapov wrote:
This is the next round of emulator cleanups. Make it even more detached
from kvm. First patch introduces IO read cache which is needed to
correctly emulate instructions that require more then one IO read exit
during emulation.
Reviewed-by: Avi
On 04/28/2010 12:21 PM, Gleb Natapov wrote:
On Wed, Apr 28, 2010 at 12:11:41PM +0300, Avi Kivity wrote:
On 04/27/2010 03:15 PM, Gleb Natapov wrote:
Return error to x86 emulator instead of injection exception behind its back.
Signed-off-by: Gleb Natapovg...@redhat.com
---
arch/x86
On 04/30/2010 08:37 PM, Marcelo Tosatti wrote:
Avi,
This patch breaks WinVista.64 install.
Please back it out then (the entire patchset).
--
Do not meddle in the internals of kernels, for they are subtle and quick to
panic.
--
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On 04/29/2010 09:09 PM, Marcelo Tosatti wrote:
You missed quadrant on 4mb large page emulation with shadow (see updated
patch below).
Good catch.
Also for some reason i can't understand the assumption
does not hold for large sptes with TDP, so reverted for now.
It's unrelated to TDP,
On 04/30/2010 12:05 PM, Xiao Guangrong wrote:
If 'oos_shadow' == 0, intercepting invlpg command is really
unnecessary.
And it's good for us to compare the performance between enable 'oos_shadow'
and disable 'oos_shadow'
@@ -74,8 +74,9 @@ static int dbg = 0;
module_param(dbg, bool, 0644);
On 04/28/2010 10:33 PM, Adam Greenblatt wrote:
Hi,
I noticed that certain guests (for example, Ubuntu 9.04, Ubuntu 9.10,
and the Ubuntu 10.04 release candidate) show dramatically (~100x) slower
graphical output when running under qemu-kvm-0.12.1.1 than under
qemu-kvm-0.11.1.
Other guests,
On 04/29/2010 02:22 AM, Marcelo Tosatti wrote:
On Wed, Apr 28, 2010 at 04:47:14PM +0300, Avi Kivity wrote:
Currently we run with EFER.NX=1 on the guest even if the guest value is 0.
This is fine with shadow, since we check bit 63 when instantiating a page
table, and fault if bit 63 is set
Signed-off-by: Avi Kivity a...@redhat.com
---
Documentation/kvm/api.txt | 12
1 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/Documentation/kvm/api.txt b/Documentation/kvm/api.txt
index 0f96e52..159b4ef 100644
--- a/Documentation/kvm/api.txt
+++ b/Documentation/kvm
On 04/28/2010 11:08 PM, Axel Kittenberger wrote:
Hello,
This is a question I was not able to answer with a search. I've been
using kvm now quite successfully as server side solution. Now I want
to use it on a particular desktop to have a Windows 7 Guest on a
native Linux system. Well this
On 05/01/2010 09:47 AM, Kyle Teague wrote:
This error occurs when I try to format the disk during the XP install
as well as when I attempt to boot into XP. When I disable
virtualization with -no-kvm everything works fine, albeit slow.
Linux kernels tried:
gentoo-2.6.31-r10
gentoo-2.6.32.r7
On 05/02/2010 01:40 AM, Yuhong Bao wrote:
It's a known bug in the Nano's vmx implementation.
Any details or workarounds?
There's a bug in the vm86/vmx interaction that happens to hit kvm. No
known workarounds.
--
Do not meddle in the internals of kernels, for they are subtle and
On 04/30/2010 11:06 PM, Michael Tokarev wrote:
I've a bugreport handy, see
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=575439
about the apparent problem booting winNT 4 in kvm 0.12.
At least 2 people were hit by this issue. In short, when
booting winNT 4.0, it BSODs with error code
Some guest msr values cannot be used on the host (for example. EFER.NX=0),
so we need to switch them atomically during guest entry or exit.
Add a facility to program the vmx msr autoload registers accordingly.
Signed-off-by: Avi Kivity a...@redhat.com
---
arch/x86/kvm/vmx.c | 49
Signed-off-by: Avi Kivity a...@redhat.com
---
arch/x86/include/asm/vmx.h |4
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index 4497318..9e6779f 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm
Signed-off-by: Avi Kivity a...@redhat.com
---
arch/x86/include/asm/vmx.h |8 +++-
1 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index fb9a080..4497318 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include
the complications described above.
v2:
Fix transition from long mode to legacy mode
Avi Kivity (5):
KVM: Let vcpu structure alignment be determined at runtime
KVM: VMX: Add definition for msr autoload entry
KVM: VMX: Add definitions for guest and host EFER autoswitch vmcs
entries
KVM: VMX: Add
When EPT is enabled, we cannot emulate EFER.NX=0 through the shadow page
tables. This causes accesses through ptes with bit 63 set to succeed instead
of failing a reserved bit check.
Signed-off-by: Avi Kivity a...@redhat.com
---
v2:
call vmx_set_efer() in exit_lmode() to update
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 a...@redhat.com
---
arch/ia64/kvm/vmm.c |2 +-
arch/powerpc/kvm/44x.c|2 +-
arch/powerpc/kvm/book3s.c |3
On 04/30/2010 08:56 PM, Avi Kivity wrote:
On 04/30/2010 08:37 PM, Marcelo Tosatti wrote:
Avi,
This patch breaks WinVista.64 install.
Please back it out then (the entire patchset).
v2 sent out. Problem was switching from long mode to legacy mode.
--
error compiling committee.c: too many
On 04/29/2010 07:09 PM, Shane Wang wrote:
Per document, for feature control MSR
Bit 1 enables VMXON in SMX operation. If the bit is clear, execution of VMXON
in SMX operation causes a general-protection exception.
Bit 2 enables VMXON outside SMX operation. If the bit is clear, execution of
On 04/29/2010 08:22 AM, Dexuan Cui wrote:
When the host enables XSAVE/XRSTOR, the patch exposes the XSAVE/XRSTOR
related CPUID leaves to guest by fixing up kvm_emulate_cpuid() and the
patch allows guest to set CR4.OSXSAVE to enable XSAVE.
The patch adds per-vcpu host/guest xstate image/mask and
only things.
Signed-off-by: Avi Kivity a...@redhat.com
---
arch/x86/include/asm/i387.h | 115 --
arch/x86/include/asm/processor.h |6 ++-
arch/x86/include/asm/xsave.h |7 +-
arch/x86/kernel/i387.c | 102
Currently all fpu accessors are wedded to task_struct. However kvm also uses
the fpu in a different context. Introduce an FPU API, and replace the
current uses with the new API.
While this patchset is oriented towards deeper changes, as a first step it
simlifies xsave for kvm.
Avi Kivity (2
threads.
Eliminate this tie-in into the task structure by using an alternative
instruction keyed off the XSAVE cpu feature; this results in shorter and
faster code, without introducing a global memory reference.
Signed-off-by: Avi Kivity a...@redhat.com
---
arch/x86/include/asm/i387.h| 20
On 05/02/2010 07:12 PM, Michael Tokarev wrote:
After installing, winNT does not boot without -cpu host,
with exactly the same diagnostics as before (0x003E).
But: After installing service pack 6, it boots just fine
with any -cpu, including the default qemu64.
With qemu-kvm-0.11.4 it all
On 05/02/2010 08:38 PM, Brian Gerst wrote:
On Sun, May 2, 2010 at 10:53 AM, Avi Kivitya...@redhat.com wrote:
The fpu code currently uses current-thread_info-status TS_XSAVE as
a way to distinguish between XSAVE capable processors and older processors.
The decision is not really task
On 05/03/2010 11:24 AM, Andre Przywara wrote:
can you try -cpu kvm64? This should be somewhat in between -cpu host
and -cpu qemu64.
Also look in dmesg for uncatched rd/wrmsrs. In case you find something
there, please try:
# modprobe kvm ignore_msrs=1
(You have to unload the modules first)
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
-by: Avi Kivity a...@redhat.com
---
arch/x86/kvm/vmx.c |9 +++--
1 files changed, 3 insertions(+), 6 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 875b785..9cfdc0e 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -753,6 +753,8 @@ static void
On 05/04/2010 12:45 AM, H. Peter Anvin wrote:
I was trying to avoid a performance regression relative to the current
code, as it appears that some care was taken to avoid the memory reference.
I agree that it's probably negligible compared to the save/restore
code. If the x86 maintainers
On 05/03/2010 07:32 PM, Joerg Roedel wrote:
On Tue, Apr 27, 2010 at 03:58:36PM +0300, Avi Kivity wrote:
So we probably need to upgrade gva_t to a u64. Please send this as
a separate patch, and test on i386 hosts.
Are there _any_ regular tests of KVM on i386 hosts? For me
On 05/04/2010 07:38 AM, Rusty Russell wrote:
On Fri, 19 Feb 2010 08:52:20 am Michael S. Tsirkin wrote:
I took a stub at documenting CMD and FLUSH request types in virtio
block. Christoph, could you look over this please?
I note that the interface seems full of warts to me,
this might be a
On 05/04/2010 10:03 AM, CaT wrote:
I'm currently running 2.6.33.3 in a KVM instance emulating a core2duo
on 1 cpu with virtio HDs running on top of a core2duo host running 2.6.33.3.
qemu-kvm version 0.12.3.
Doesn't appear to be related to kvm. Copying lkml.
When doing:
echo
On 05/03/2010 08:03 PM, Michael Tokarev wrote:
Michael, can you try to use -cpu host,-vme and see if that makes a
difference?
With -cpu host,-vme winNT boots just fine as with just -cpu host.
I also tried with -cpu qemu64 and kvm64, with +vme and -vme (4
combinations in total) - in all cases
On 05/04/2010 12:11 PM, Roedel, Joerg wrote:
On Tue, May 04, 2010 at 03:53:57AM -0400, Avi Kivity wrote:
On 05/03/2010 07:32 PM, Joerg Roedel wrote:
On Tue, Apr 27, 2010 at 03:58:36PM +0300, Avi Kivity wrote:
So we probably need to upgrade gva_t to a u64. Please send
On 05/04/2010 05:04 AM, Marcelo Tosatti wrote:
The recent changes to emulate string instructions without entering guest
mode exposed a bug where pending interrupts are not properly reflected
in ready_for_interrupt_injection.
The result is that userspace overwrites a previously queued interrupt,
On 04/28/2010 12:50 PM, Takuya Yoshikawa wrote:
Hi Marcelo, Avi,
I updated the patch as follows.
Changelog:
1. Inserted one r = -ENOMEM; line following Avi's advice.
2. Little change of explanation about performance improvements.
I'm now testing and cleaning up my next patch series based
On 04/27/2010 12:46 PM, Michael Tokarev wrote:
I've a debian bugreport that claims to have a fix
for apparently wrong keymap for usb keyboard. I
noticed this before with ps/2 keyboard too, the
sympthoms were that e.g windows keys were not
working in guests, but later on that has been
fixed.
On 05/04/2010 12:37 PM, Roedel, Joerg wrote:
This is the lockdep warning I get when I start booting a Linux kernel.
It is with the nested-npt patchset but the warning occurs without it too
(slightly different backtraces then).
[60390.953424]
On 05/04/2010 12:45 PM, Avi Kivity wrote:
Just a silly bug. kvm_pdptr_read() can cause a guest memory read on
svm, in this case with the mmu lock taken. I'll post something to fix
it.
I guess this was not reported because most svm machines have npt, and
this requires npt=0 to trigger
On svm, kvm_read_pdptr() may require reading guest memory, which can sleep.
Push the spinlock into mmu_alloc_roots(), and only take it after we've read
the pdptr.
Signed-off-by: Avi Kivity a...@redhat.com
---
Marcelo, dropping and re-acquiring the lock before mmu_sync_roots(), is fine,
yes
Annotate it thusly.
Signed-off-by: Avi Kivity a...@redhat.com
---
arch/x86/kvm/kvm_cache_regs.h |2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/kvm_cache_regs.h b/arch/x86/kvm/kvm_cache_regs.h
index cff851c..d2a98f8 100644
--- a/arch/x86/kvm
Wallclock writing uses an unprotected global variable to hold the version;
this can cause one guest to interfere with another if both write their
wallclock at the same time.
Signed-off-by: Avi Kivity a...@redhat.com
---
arch/x86/kvm/x86.c | 12 ++--
1 files changed, 10 insertions(+), 2
On 05/04/2010 03:00 PM, Roedel, Joerg wrote:
On Tue, May 04, 2010 at 05:50:50AM -0400, Avi Kivity wrote:
On 05/04/2010 12:45 PM, Avi Kivity wrote:
Just a silly bug. kvm_pdptr_read() can cause a guest memory read on
svm, in this case with the mmu lock taken. I'll post something
On 05/04/2010 06:03 PM, Arnd Bergmann wrote:
On Tuesday 04 May 2010, Takuya Yoshikawa wrote:
Although we can use *_le_bit() helpers to treat bitmaps le arranged,
having le bit offset calculation as a seperate macro gives us more freedom.
For example, KVM has le arranged dirty bitmaps for
On 05/04/2010 03:02 PM, Avi Kivity wrote:
Wallclock writing uses an unprotected global variable to hold the version;
this can cause one guest to interfere with another if both write their
wallclock at the same time.
Signed-off-by: Avi Kivitya...@redhat.com
This was pointed out by Naphtali
On 05/04/2010 06:27 PM, Andre Przywara wrote:
3. In all other cases so far it BSoDs with STOP 0x3E error
right before displaying that kernel message.
MSDN talks about a mulitprocessor configuration error:
http://msdn.microsoft.com/en-us/library/ms819006.aspx
I suspected the offline CPUs in
On 05/04/2010 07:31 PM, Marcelo Tosatti wrote:
On Mon, May 03, 2010 at 05:19:08PM +0300, Avi Kivity wrote:
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
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