On 18.11.2013 17:11, Paolo Bonzini wrote:
Il 18/11/2013 16:37, Peter Lieven ha scritto:
If I specify: -smp 2,sockets=1,cores=2,threads=1 to a Windows 2012 R2
Server it crashes
at boot time. -smp 2 works.
for Linux /proc/cpuinfo reveals no cpu layout information (sibliings,
cores, threads
Il 19/11/2013 11:25, Peter Lieven ha scritto:
~/git/qemu$ x86_64-softmmu/qemu-system-x86_64 -m 2048 -drive
if=virtio,file=iscsi://172.21.200.45/iqn.2001-05.com.equallogic:0-8a0906-9d95c510a-344001d54795289f-2012-r2-1-7-0/0,format=raw,cache=writeback,aio=native
-smp
Il 18/11/2013 20:53, Peter Lieven ha scritto:
The essential part is -enable-kvm -smp 2,sockets=1,cores=2,threads=1 -cpu
host.
I believe the corect fix could be to disabled the cache leave forwarding as
soon
as the user specifies his own socket/core/thread layout.
Please test this:
diff
On 19.11.2013 11:47, Paolo Bonzini wrote:
Il 19/11/2013 11:25, Peter Lieven ha scritto:
~/git/qemu$ x86_64-softmmu/qemu-system-x86_64 -m 2048 -drive
next question: is cache leaf forwarding a migration blocker?
Il 19/11/2013 12:35, Peter Lieven ha scritto:
next question: is cache leaf forwarding a migration blocker?
-cpu host in general is interesting at migration time, so I would
say no.
Paolo
On 19.11.2013 12:37, Paolo Bonzini wrote:
Il 19/11/2013 12:35, Peter Lieven ha scritto:
next question: is cache leaf forwarding a migration blocker?
-cpu host in general is interesting at migration time, so I would
say no.
It works for for a long time as long as all cpu features that are
On 19.11.2013 11:47, Paolo Bonzini wrote:
Il 19/11/2013 11:25, Peter Lieven ha scritto:
~/git/qemu$ x86_64-softmmu/qemu-system-x86_64 -m 2048 -drive
On 19.11.2013 13:03, Peter Lieven wrote:
On 19.11.2013 11:47, Paolo Bonzini wrote:
Il 19/11/2013 11:25, Peter Lieven ha scritto:
~/git/qemu$ x86_64-softmmu/qemu-system-x86_64 -m 2048 -drive
Il 19/11/2013 13:03, Peter Lieven ha scritto:
Can you test which of these two work? But I agree it's best to disable
cache-leaf forwarding.
The first does make windows boot again and it calculates a
correct combination of cpus, threads, cores and sockets. But
I think the reason it boots is
On 19.11.2013 13:14, Paolo Bonzini wrote:
Il 19/11/2013 13:03, Peter Lieven ha scritto:
Can you test which of these two work? But I agree it's best to disable
cache-leaf forwarding.
The first does make windows boot again and it calculates a
correct combination of cpus, threads, cores and
Il 19/11/2013 13:32, Peter Lieven ha scritto:
+
+/* We give out APIC IDs ourselves, so force bits 31..26 even
for -cpu host. */
+if (cs-nr_cores 1) {
+*eax |= (cs-nr_cores - 1) 26;
}
break;
case 5:
I already tried exactly this
On 19.11.2013 14:21, Paolo Bonzini wrote:
Il 19/11/2013 13:32, Peter Lieven ha scritto:
+
+/* We give out APIC IDs ourselves, so force bits 31..26 even
for -cpu host. */
+if (cs-nr_cores 1) {
+*eax |= (cs-nr_cores - 1) 26;
}
break;
Il 19/11/2013 15:11, Peter Lieven ha scritto:
I already tried exactly this fix. Its reading index 0x004 for
increasing indexes until qemu aborts:
Oops, it should be I guess if ((*eax 31) cs-nr_cores 1).
Maybe, how should we continue. This should be fixed before 1.7 comes out.
If this
On 19.11.2013 15:14, Paolo Bonzini wrote:
if ((*eax 31) cs-nr_cores 1)
at which position exactly do you want to put this condition and take which
action?
Peter
Il 19/11/2013 15:17, Peter Lieven ha scritto:
if ((*eax 31) cs-nr_cores 1)
at which position exactly do you want to put this condition and take
which action?
Just replace if (cs-nr_cores 1) in the patch I posted, i.e. after the
switch.
Paolo
-- 8 -
From
On 19.11.2013 15:19, Paolo Bonzini wrote:
Il 19/11/2013 15:17, Peter Lieven ha scritto:
if ((*eax 31) cs-nr_cores 1)
at which position exactly do you want to put this condition and take
which action?
Just replace if (cs-nr_cores 1) in the patch I posted, i.e. after the
switch.
This
Il 19/11/2013 15:46, Peter Lieven ha scritto:
Just replace if (cs-nr_cores 1) in the patch I posted, i.e. after
the switch.
This seems to work. What is in bits 0..5 of eax?
It's the kind of cache. 0 means that there is no cache and the returned
data is not valid. In theory, Intel says you
On 19.11.2013 15:57, Paolo Bonzini wrote:
Il 19/11/2013 15:46, Peter Lieven ha scritto:
Just replace if (cs-nr_cores 1) in the patch I posted, i.e. after
the switch.
This seems to work. What is in bits 0..5 of eax?
It's the kind of cache. 0 means that there is no cache and the returned
data
Il 19/11/2013 16:05, Peter Lieven ha scritto:
What about the number of threads in count == 2?
That's a property of the L2 cache. It's not related to APIC IDs.
okay, but the contents could be wrong if the physical system
has threads while the emulated vserver has not. does this
matter?
If
I do not know, but this patch might introduce a regression.
If I specify: -smp 2,sockets=1,cores=2,threads=1 to a Windows 2012 R2 Server it
crashes
at boot time. -smp 2 works.
git bisect start
# good: [62ecc3a0e3c77a4944c92a02dd7fae2ab1f2290d] Update VERSION for 1.6.1
release
git bisect good
On 18.11.2013 16:23, Peter Lieven wrote:
I do not know, but this patch might introduce a regression.
If I specify: -smp 2,sockets=1,cores=2,threads=1 to a Windows 2012 R2 Server it
crashes
at boot time. -smp 2 works.
for Linux /proc/cpuinfo reveals no cpu layout information (sibliings, cores,
Il 18/11/2013 16:37, Peter Lieven ha scritto:
If I specify: -smp 2,sockets=1,cores=2,threads=1 to a Windows 2012 R2
Server it crashes
at boot time. -smp 2 works.
for Linux /proc/cpuinfo reveals no cpu layout information (sibliings,
cores, threads etc.) with
this patch applied and a manual
Am 18.11.2013 17:11, schrieb Paolo Bonzini:
Il 18/11/2013 16:37, Peter Lieven ha scritto:
If I specify: -smp 2,sockets=1,cores=2,threads=1 to a Windows 2012 R2
Server it crashes
at boot time. -smp 2 works.
for Linux /proc/cpuinfo reveals no cpu layout information (sibliings,
cores, threads
From: Benoît Canet ben...@irqsave.net
Some users running cpu intensive tasks checking the cache CPUID leaves at
startup and making decisions based on the result reported that the guest was
not reflecting the host CPUID leaves when -cpu host is used.
This patch fix this.
Signed-off-by: Benoît
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