Il 12/12/2013 03:52, Fernando Luis Vázquez Cao ha scritto:
On 12/09/2013 05:50 PM, Fernando Luis Vázquez Cao wrote:
On 12/06/2013 11:22 PM, Marcelo Tosatti wrote:
On Fri, Dec 06, 2013 at 05:24:18PM +0900, Fernando Luis Vázquez Cao
wrote:
I also wanted to make sure that the initialization that
On 12/09/2013 05:50 PM, Fernando Luis Vázquez Cao wrote:
On 12/06/2013 11:22 PM, Marcelo Tosatti wrote:
On Fri, Dec 06, 2013 at 05:24:18PM +0900, Fernando Luis Vázquez Cao
wrote:
I also wanted to make sure that the initialization that we do
in kvm_arch_vcpu_postcreate on power up and the
On 12/06/2013 11:22 PM, Marcelo Tosatti wrote:
On Fri, Dec 06, 2013 at 05:24:18PM +0900, Fernando Luis Vázquez Cao wrote:
I also wanted to make sure that the initialization that we do
in kvm_arch_vcpu_postcreate on power up and the subsequent
TSC writeback work well together, but I didn't have
On 12/06/2013 01:38 AM, Paolo Bonzini wrote:
Il 05/12/2013 17:17, Marcelo Tosatti ha scritto:
I agree it is a bit ugly, but in my testing QEMU seemed to loop over all
the VCPUS fast enough for the kernel side kvm_write_tsc() to do a
reasonable job of matching the offsets (the Linux guest did
Il 06/12/2013 09:24, Fernando Luis Vázquez Cao ha scritto:
Could we start with the patch that I already sent? It's been
tested, it is conservative in the sense that it does the minimum
necessary to fix an existing bug, and should be easy to
backport. I will be replying to this email with an
On 12/06/2013 05:36 PM, Paolo Bonzini wrote:
Il 06/12/2013 09:24, Fernando Luis Vázquez Cao ha scritto:
Could we start with the patch that I already sent? It's been
tested, it is conservative in the sense that it does the minimum
necessary to fix an existing bug, and should be easy to
backport.
Il 06/12/2013 09:56, Fernando Luis Vázquez Cao ha scritto:
I will also be sending a patch that makes the TSC writeback
unconditional, but this one should probably be kept on hold
until it is properly tested.
If you test it, I can drop the if myself from your patch.
Unfortunately I will
On 2013年12月06日 18:08, Paolo Bonzini wrote:
Il 06/12/2013 09:56, Fernando Luis Vázquez Cao ha scritto:
I will also be sending a patch that makes the TSC writeback
unconditional, but this one should probably be kept on hold
until it is properly tested.
If you test it, I can drop the if myself
On Fri, Dec 06, 2013 at 05:24:18PM +0900, Fernando Luis Vázquez Cao wrote:
On 12/06/2013 01:38 AM, Paolo Bonzini wrote:
Il 05/12/2013 17:17, Marcelo Tosatti ha scritto:
I agree it is a bit ugly, but in my testing QEMU seemed to loop over all
the VCPUS fast enough for the kernel side
Il 05/12/2013 07:15, Fernando Luis Vázquez Cao ha scritto:
VCPU TSC is not cleared by a warm reset (*), which leaves many Linux
guests vulnerable to the overflow in cyc2ns_offset fixed by upstream
commit 9993bc635d01a6ee7f6b833b4ee65ce7c06350b1 (sched/x86: Fix overflow
in cyc2ns_offset).
To
(2013/12/05 18:28), Paolo Bonzini wrote:
Il 05/12/2013 07:15, Fernando Luis Vázquez Cao ha scritto:
VCPU TSC is not cleared by a warm reset (*), which leaves many Linux
guests vulnerable to the overflow in cyc2ns_offset fixed by upstream
commit 9993bc635d01a6ee7f6b833b4ee65ce7c06350b1
Il 05/12/2013 14:15, Fernando Luis Vazquez Cao ha scritto:
/*
* KVM is yet unable to synchronize TSC values of multiple VCPUs on
* writeback. Until this is fixed, we only write the offset to SMP
* guests after migration, desynchronizing the VCPUs, but
(2013/12/05 22:53), Paolo Bonzini wrote:
Il 05/12/2013 14:15, Fernando Luis Vazquez Cao ha scritto:
/*
* KVM is yet unable to synchronize TSC values of multiple VCPUs on
* writeback. Until this is fixed, we only write the offset to SMP
* guests after
Il 05/12/2013 16:42, Fernando Luis Vazquez Cao ha scritto:
(2013/12/05 22:53), Paolo Bonzini wrote:
Il 05/12/2013 14:15, Fernando Luis Vazquez Cao ha scritto:
/*
* KVM is yet unable to synchronize TSC values of multiple VCPUs on
* writeback. Until this is fixed,
On Thu, Dec 05, 2013 at 10:28:18AM +0100, Paolo Bonzini wrote:
Il 05/12/2013 07:15, Fernando Luis Vázquez Cao ha scritto:
VCPU TSC is not cleared by a warm reset (*), which leaves many Linux
guests vulnerable to the overflow in cyc2ns_offset fixed by upstream
commit
On Fri, Dec 06, 2013 at 12:42:44AM +0900, Fernando Luis Vazquez Cao wrote:
(2013/12/05 22:53), Paolo Bonzini wrote:
Il 05/12/2013 14:15, Fernando Luis Vazquez Cao ha scritto:
/*
* KVM is yet unable to synchronize TSC values of multiple VCPUs
on
* writeback.
Il 05/12/2013 17:12, Marcelo Tosatti ha scritto:
- call kvm_set_ticks() from cpu_set_ticks() and cpu_enable_ticks()
env-tsc is just a placeholder for the vcpu TSC.
A vcpus TSC from QEMU's point of view is a register initialized to zero,
which requires read/write from KVM, and migration.
Il 05/12/2013 17:17, Marcelo Tosatti ha scritto:
I agree it is a bit ugly, but in my testing QEMU seemed to loop over all
the VCPUS fast enough for the kernel side kvm_write_tsc() to do a
reasonable job of matching the offsets (the Linux guest did not mark
the TSC unstable due to the TSCs
On Thu, Dec 05, 2013 at 05:02:02PM +0100, Paolo Bonzini wrote:
Il 05/12/2013 16:42, Fernando Luis Vazquez Cao ha scritto:
(2013/12/05 22:53), Paolo Bonzini wrote:
Il 05/12/2013 14:15, Fernando Luis Vazquez Cao ha scritto:
/*
* KVM is yet unable to synchronize TSC values
On Thu, Dec 05, 2013 at 02:40:00PM -0200, Marcelo Tosatti wrote:
On Thu, Dec 05, 2013 at 05:02:02PM +0100, Paolo Bonzini wrote:
Il 05/12/2013 16:42, Fernando Luis Vazquez Cao ha scritto:
(2013/12/05 22:53), Paolo Bonzini wrote:
Il 05/12/2013 14:15, Fernando Luis Vazquez Cao ha scritto:
VCPU TSC is not cleared by a warm reset (*), which leaves many Linux
guests vulnerable to the overflow in cyc2ns_offset fixed by upstream
commit 9993bc635d01a6ee7f6b833b4ee65ce7c06350b1 (sched/x86: Fix overflow
in cyc2ns_offset).
To put it in a nutshell, if a Linux guest without the patch above
21 matches
Mail list logo
