m_cpu_synchronize_post_init().
Changes in v2:
* Add a pair of cpu options 'save-tsc-freq' and 'load-tsc-freq' to
control the migration of vcpu's TSC rate.
* Move all logic of setting TSC rate to target-i386.
* Remove the duplicated TSC setup in kvm_arch_init_vcpu(
C rate from KVM (returned by
KVM_GET_TSC_KHZ).
3. Otherwise, we will use the migrated TSC rate.
Signed-off-by: Haozhong Zhang
---
include/sysemu/kvm.h | 2 ++
kvm-all.c| 1 +
target-arm/kvm.c | 5 +
target-i386/kvm.c| 33 +
target-mip
A new subsection 'vmstate_tsc_khz' is added to migrate vcpu's TSC
rate. For the backwards compatibility, this subsection is not migrated
on pc-*-2.4 and older machine types.
Signed-off-by: Haozhong Zhang
---
hw/i386/pc.c | 1 +
hw/i386/pc_piix.c | 1 +
hw/i386/pc_
Set vcpu's TSC rate to the migrated value if the user does not specify a
TSC rate by cpu option 'tsc-freq' and a migrated TSC rate does exist. If
KVM supports TSC scaling, guest programs will observe TSC increasing in
the migrated rate other than the host TSC rate.
Signed-off-by:
On Mon, Nov 02, 2015 at 09:40:18AM +, James Hogan wrote:
> On Mon, Nov 02, 2015 at 05:26:42PM +0800, Haozhong Zhang wrote:
> > The value of the migrated vcpu's TSC rate is determined as below.
> > 1. If a TSC rate is specified by the cpu option 'tsc-freq', th
On 11/04/15 19:42, Eduardo Habkost wrote:
> On Mon, Nov 02, 2015 at 05:26:42PM +0800, Haozhong Zhang wrote:
> > The value of the migrated vcpu's TSC rate is determined as below.
> > 1. If a TSC rate is specified by the cpu option 'tsc-freq', then this
> >
On 11/05/15 09:05, Christian Borntraeger wrote:
> Am 02.11.2015 um 10:40 schrieb James Hogan:
> > On Mon, Nov 02, 2015 at 05:26:42PM +0800, Haozhong Zhang wrote:
> >> The value of the migrated vcpu's TSC rate is determined as below.
> >> 1. If a TSC rate is speci
On 11/05/15 14:05, Eduardo Habkost wrote:
> On Thu, Nov 05, 2015 at 09:30:51AM +0800, Haozhong Zhang wrote:
> > On 11/04/15 19:42, Eduardo Habkost wrote:
> > > On Mon, Nov 02, 2015 at 05:26:42PM +0800, Haozhong Zhang wrote:
> > > > The value of the migrated vcpu
On 11/05/15 14:10, Eduardo Habkost wrote:
> On Mon, Nov 02, 2015 at 05:26:43PM +0800, Haozhong Zhang wrote:
> > Set vcpu's TSC rate to the migrated value if the user does not specify a
> > TSC rate by cpu option 'tsc-freq' and a migrated TSC rate does exist. If
>
On 11/06/15 11:49, Paolo Bonzini wrote:
>
>
> On 20/10/2015 09:39, Haozhong Zhang wrote:
> > This patchset adds support for VMX TSC scaling feature which is
> > available on Intel Skylake CPU. The specification of VMX TSC scaling
> > can be found at
> > http:
On 11/06/15 21:40, Paolo Bonzini wrote:
>
>
> On 06/11/2015 13:42, Haozhong Zhang wrote:
> > On 11/06/15 11:49, Paolo Bonzini wrote:
> >>
> >>
> >> On 20/10/2015 09:39, Haozhong Zhang wrote:
> >>> This patchset adds support for VMX TSC sca
On 11/06/15 13:12, Eduardo Habkost wrote:
> On Fri, Nov 06, 2015 at 10:32:24AM +0800, haozhong.zh...@intel.com wrote:
> > On 11/05/15 14:05, Eduardo Habkost wrote:
> > > On Thu, Nov 05, 2015 at 09:30:51AM +0800, Haozhong Zhang wrote:
> > > > On 11/04/1
5 14:05, Eduardo Habkost wrote:
> > > > > On Thu, Nov 05, 2015 at 09:30:51AM +0800, Haozhong Zhang wrote:
> > > > > > On 11/04/15 19:42, Eduardo Habkost wrote:
> > > [...]
> > > > > > > > +env->tsc_khz_saved = r;
> >
5 14:05, Eduardo Habkost wrote:
> > > > > On Thu, Nov 05, 2015 at 09:30:51AM +0800, Haozhong Zhang wrote:
> > > > > > On 11/04/15 19:42, Eduardo Habkost wrote:
> > > [...]
> > > > > > > > +env->tsc_khz_saved = r;
> >
On 11/11/15 12:16, Eduardo Habkost wrote:
> On Mon, Nov 02, 2015 at 05:26:41PM +0800, Haozhong Zhang wrote:
> > A new subsection 'vmstate_tsc_khz' is added to migrate vcpu's TSC
> > rate. For the backwards compatibility, this subsection is not migrated
> >
On 11/11/15 13:23, Eduardo Habkost wrote:
> On Wed, Nov 11, 2015 at 12:57:44AM +0800, Haozhong Zhang wrote:
> > On 11/09/15 14:01, Eduardo Habkost wrote:
> > > On Mon, Nov 09, 2015 at 08:33:55AM +0800, haozhong.zh...@intel.com wrote:
> > > > On 11/06/15 13:12, Eduar
On 11/11/15 12:54, Eduardo Habkost wrote:
> On Tue, Nov 10, 2015 at 09:08:58AM +0800, Haozhong Zhang wrote:
> > On 11/09/15 14:01, Eduardo Habkost wrote:
> > > On Mon, Nov 09, 2015 at 08:33:55AM +0800, haozhong.zh...@intel.com wrote:
> > > > On 11/06/15 13:12, Eduar
On 11/11/15 22:27, Haozhong Zhang wrote:
> On 11/11/15 12:16, Eduardo Habkost wrote:
[...]
> > > diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
> > > index 2f8f396..858ed69 100644
> > > --- a/hw/i386/pc_q35.c
> > > +++ b/hw/i386/pc_q35.
On 11/13/15 13:21, Eduardo Habkost wrote:
> On Fri, Nov 13, 2015 at 10:23:54AM +0800, Haozhong Zhang wrote:
> > On 11/11/15 22:27, Haozhong Zhang wrote:
> > > On 11/11/15 12:16, Eduardo Habkost wrote:
> > [...]
> > > > > diff --git a/hw/i386/pc_q35.c b/h
te is
disabled on pc-*-2.4 and older machine types.
Signed-off-by: Haozhong Zhang
---
hw/i386/pc.c | 1 +
hw/i386/pc_piix.c | 1 +
hw/i386/pc_q35.c | 1 +
include/hw/i386/pc.h | 1 +
target-i386/cpu.c | 2 +-
target-i386/cpu.h | 1 +
target-i386/kvm.c | 26
SC rate as above.
* Move the setup of migrated TSC rate back to
do_kvm_cpu_synchronize_post_init().
Changes in v2:
* Add a pair of cpu options 'save-tsc-freq' and 'load-tsc-freq' to
control the migration of vcpu's TSC rate.
* Move all logic of setting TSC rate to target-i386.
If no user-specified TSC rate is present, we will try to set
env->tsc_khz to the value returned by KVM_GET_TSC_KHZ.
Signed-off-by: Haozhong Zhang
---
target-i386/kvm.c | 25 +
1 file changed, 25 insertions(+)
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
in
On 11/16/15 11:43, Eduardo Habkost wrote:
> On Mon, Nov 16, 2015 at 04:04:08PM +0800, Haozhong Zhang wrote:
> > This patch enables migrating vcpu's TSC rate. If KVM on the destination
> > machine supports TSC scaling, guest programs will observe a consistent
> > TSC
On 11/16/15 11:39, Eduardo Habkost wrote:
> On Mon, Nov 16, 2015 at 04:04:07PM +0800, Haozhong Zhang wrote:
> > If no user-specified TSC rate is present, we will try to set
> > env->tsc_khz to the value returned by KVM_GET_TSC_KHZ.
> >
> > Signed-off-by: Haozhong Z
If no user-specified TSC rate is present, we will try to set
env->tsc_khz to the value returned by KVM_GET_TSC_KHZ.
Signed-off-by: Haozhong Zhang
---
target-i386/kvm.c | 12
1 file changed, 12 insertions(+)
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 2a9953b..9e4d
es in v2:
* Add a pair of cpu options 'save-tsc-freq' and 'load-tsc-freq' to
control the migration of vcpu's TSC rate.
* Move all logic of setting TSC rate to target-i386.
* Remove the duplicated TSC setup in kvm_arch_init_vcpu().
Haozhong Zhang (3):
target-i386: fal
-by: Haozhong Zhang
---
target-i386/kvm.c | 45 ++---
1 file changed, 38 insertions(+), 7 deletions(-)
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 9e4d27f..6a1acb4 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -524,6 +524,41
te is
disabled on pc-*-2.4 and older machine types.
Signed-off-by: Haozhong Zhang
---
hw/i386/pc.c | 1 +
hw/i386/pc_piix.c | 1 +
hw/i386/pc_q35.c | 1 +
include/hw/i386/pc.h | 1 +
target-i386/cpu.c | 2 +-
target-i386/cpu.h | 1 +
target-i386/kvm.c | 4 ++
On 11/16/15 13:35, Eduardo Habkost wrote:
> On Mon, Nov 16, 2015 at 10:30:08PM +0800, Haozhong Zhang wrote:
> > On 11/16/15 11:43, Eduardo Habkost wrote:
> > > On Mon, Nov 16, 2015 at 04:04:08PM +0800, Haozhong Zhang wrote:
> > > > This patch enables migrating
On 11/17/15 11:14, Eduardo Habkost wrote:
> On Tue, Nov 17, 2015 at 01:20:37PM +0800, Haozhong Zhang wrote:
> > If no user-specified TSC rate is present, we will try to set
> > env->tsc_khz to the value returned by KVM_GET_TSC_KHZ.
> >
> > Signed-off-by: Haozhong Z
On 11/17/15 11:32, Eduardo Habkost wrote:
> On Tue, Nov 17, 2015 at 01:20:38PM +0800, Haozhong Zhang wrote:
> > Following two changes are made to the TSC rate setting code in
> > kvm_arch_init_vcpu():
> > * The code is moved to a new function kvm_arch_set_tsc_khz().
&
On 11/17/15 11:40, Eduardo Habkost wrote:
> Hi,
>
> On Tue, Nov 17, 2015 at 01:20:39PM +0800, Haozhong Zhang wrote:
> > This patch enables migrating vcpu's TSC rate. If KVM on the destination
> > machine supports TSC scaling, guest programs will observe a consiste
te is
disabled on pc-*-2.4 and older machine types.
Signed-off-by: Haozhong Zhang
---
hw/i386/pc.c | 1 +
hw/i386/pc_piix.c | 1 +
hw/i386/pc_q35.c | 1 +
include/hw/i386/pc.h | 1 +
target-i386/cpu.c | 2 +-
target-i386/cpu.h | 1 +
target-i386/kvm.c | 22 +
_vcpu()
unconditionally, even though the TSC rate to be set is identical
to the value currently used by KVM.
Signed-off-by: Haozhong Zhang
---
target-i386/kvm.c | 40 +---
1 file changed, 33 insertions(+), 7 deletions(-)
diff --git a/target-i386/kv
If no user-specified TSC rate is present, we will try to set
env->tsc_khz to the value returned by KVM_GET_TSC_KHZ. This patch does
not change the current functionality of QEMU and just prepares for later
patches to enable migrating vcpu's TSC rate.
Signed-off-by: Haozhong Zhang
---
tar
pu options 'save-tsc-freq' and 'load-tsc-freq' to
control the migration of vcpu's TSC rate.
* Move all logic of setting TSC rate to target-i386.
* Remove the duplicated TSC setup in kvm_arch_init_vcpu().
Haozhong Zhang (3):
target-i386: fallback vcpu's TSC rate to va
erence. In practice, it can crash both KVM itself and L1
hypervisors that use invvpid (e.g. Xen).
Signed-off-by: Haozhong Zhang
---
arch/x86/kvm/vmx.c | 5 -
1 file changed, 5 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 87acc52..af823a3 100644
--- a/arch/x86/kvm/v
On 11/25/15 10:45, Bandan Das wrote:
> Haozhong Zhang writes:
>
> > This patch removes the vpid check when emulating nested invvpid
> > instruction of type all-contexts invalidation. The existing code is
> > incorrect because:
> > (1) According to Intel SDM Vol 3,
On 11/26/15 12:19, Eduardo Habkost wrote:
> On Tue, Nov 24, 2015 at 11:33:57AM +0800, Haozhong Zhang wrote:
> > This patch enables migrating vcpu's TSC rate. If KVM on the destination
> > machine supports TSC scaling, guest programs will observe a consistent
> > TSC
), current KVM will
fail the saving and thus all other MSRs following it will fail in
kvm_get_msrs(). As a result, from KVM commit 9dbe6cf that exposes
MSR_TSC_AUX, VM can not successfully reboot.
This patch fixes this bug by adding the missing rdtscp feature checks.
Signed-off-by: Haozhong Zhang
On 12/14/15 12:51, Paolo Bonzini wrote:
>
>
> On 14/12/2015 12:07, Haozhong Zhang wrote:
> > This patch fix a bug that prevents VM rebooting on recent versions of
> > KVM (from commit 9dbe6cf).
> >
> > kvm_get_msrs() is called to save guest MSR_TSC_AUX and ot
handling instead.
Signed-off-by: Haozhong Zhang
---
arch/x86/kvm/vmx.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 1a8bfaa..50f2b78 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2802,7 +2802,7 @@ static int
#x27;header'
afterwards may be illegal.
This patch fixes this issue by storing an offset within table_data->data[]
(rather than an address) in 'header'.
Signed-off-by: Haozhong Zhang
Reviewed-by: Xiao Guangrong
---
hw/acpi/nvdimm.c | 8 +---
1 file changed, 5 insertions(+
,
the current kvm_set_msr_common() uses it as a value in host TSC
cycles (by using true as the 3rd parameter of adjust_tsc_offset()),
which can result in an incorrect adjustment of TSC offset if SVM TSC
scaling is enabled. This patch fixes this problem.
Signed-off-by: Haozhong Zhang
---
arch/x8
t KVM on the target machine supports TSC scaling, guest
programs running on the migrated vcpu will observe the same TSC rate
before and after the migration.
Signed-off-by: Haozhong Zhang
---
kvm-all.c | 13 +
1 file changed, 13 insertions(+)
diff --git a/kvm-all.c b/kvm-all.c
index 0b
The newly added subsection 'vmstate_tsc_khz' in this patch results in
vcpu's TSC rate being saved on the source machine and loaded on the
target machine during the migration.
Signed-off-by: Haozhong Zhang
---
target-i386/machine.c | 20
1 file changed
When creating a vcpu, we initialize its TSC rate to the value from
KVM (through ioctl KVM_GET_TSC_KHZ).
Signed-off-by: Haozhong Zhang
---
target-i386/kvm.c | 7 +++
1 file changed, 7 insertions(+)
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 7b0ba17..c2b161a 100644
--- a/target
This patch makes kvm-intel to return a scaled host TSC plus the TSC
offset when handling guest readings to MSR_IA32_TSC.
Signed-off-by: Haozhong Zhang
---
arch/x86/kvm/vmx.c | 8
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index
This patch enhances dump_vmcs() to dump the value of TSC multiplier
field in VMCS.
Signed-off-by: Haozhong Zhang
---
arch/x86/kvm/vmx.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index d0a2928..b19cdbe 100644
--- a/arch/x86/kvm/vmx.c
+++ b
Both VMX and SVM scales the host TSC in the same way in call-back
read_l1_tsc(), so this patch moves the scaling logic from call-back
read_l1_tsc() to a common function kvm_read_l1_tsc().
Signed-off-by: Haozhong Zhang
---
arch/x86/kvm/lapic.c | 5 ++---
arch/x86/kvm/svm.c | 3
This patch makes kvm-intel module to load TSC scaling ratio into TSC
multiplier field of VMCS when a vcpu is loaded, so that TSC scaling
ratio can take effect if VMX TSC scaling is enabled.
Signed-off-by: Haozhong Zhang
---
arch/x86/kvm/vmx.c | 6 ++
1 file changed, 6 insertions(+)
diff
This patch exhances kvm-intel module to enable VMX TSC scaling and
collects information of TSC scaling ratio during initialization.
Signed-off-by: Haozhong Zhang
---
arch/x86/include/asm/vmx.h | 4 +++-
arch/x86/kvm/vmx.c | 20 +++-
2 files changed, 22 insertions(+), 2
Both VMX and SVM calculate the tsc-offset in the same way, so this
patch removes the call-back compute_tsc_offset() and replaces it with a
common function kvm_compute_tsc_offset().
Signed-off-by: Haozhong Zhang
---
arch/x86/include/asm/kvm_host.h | 1 -
arch/x86/kvm/svm.c | 10
VMX and SVM calculate the TSC scaling ratio in a similar logic, so this
patch generalizes it to a common TSC scaling function.
Signed-off-by: Haozhong Zhang
---
arch/x86/kvm/svm.c | 48 +++--
arch/x86/kvm/x86.c | 70
Both VMX and SVM propagate virtual_tsc_khz in the same way, so this
patch removes the call-back set_tsc_khz() and replaces it with a common
function.
Signed-off-by: Haozhong Zhang
---
arch/x86/include/asm/kvm_host.h | 1 -
arch/x86/kvm/svm.c | 36
This patchset enables QEMU to save/restore vcpu's TSC rate during the
migration. When cooperating with KVM which supports TSC scaling, guest
programs can observe a consistent guest TSC rate even though they are
migrated among machines with different host TSC rates.
Haozhong Zhang (3):
t
This patch makes KVM use virtual_tsc_khz rather than the host TSC rate
as vcpu's TSC rate to compute the time scale if TSC scaling is enabled.
Signed-off-by: Haozhong Zhang
---
arch/x86/kvm/x86.c | 6 --
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/x86.c b
For both VMX and SVM, if the 2nd argument of call-back
adjust_tsc_offset() is the host TSC, then adjust_tsc_offset() will scale
it first. This patch moves this common TSC scaling logic to its caller
adjust_tsc_offset_host().
Signed-off-by: Haozhong Zhang
---
arch/x86/include/asm/kvm_host.h | 13
The number of bits of the fractional part of the 64-bit TSC scaling
ratio in VMX and SVM is different. This patch makes the architecture
code to collect the number of fractional bits and other related
information into variables that can be accessed in the common code.
Signed-off-by: Haozhong
This patch moves the field of TSC scaling ratio from the architecture
struct vcpu_svm to the common struct kvm_vcpu_arch.
Signed-off-by: Haozhong Zhang
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/svm.c | 23 +--
arch/x86/kvm/x86.c | 3
logics from
SVM code to the common code. Upon them, patch 9 ~ 12 add VMX-specific
support for VMX TSC scaling.
Haozhong Zhang (12):
KVM: x86: Collect information for setting TSC scaling ratio
KVM: x86: Add a common TSC scaling ratio field in kvm_vcpu_arch
KVM: x86: Add a common TSC scalin
On Mon, Sep 28, 2015 at 01:17:44PM -0300, Eduardo Habkost wrote:
> On Mon, Sep 28, 2015 at 01:38:30PM +0800, Haozhong Zhang wrote:
> > When creating a vcpu, we initialize its TSC rate to the value from
> > KVM (through ioctl KVM_GET_TSC_KHZ).
> >
> > Si
On Tue, Sep 29, 2015 at 09:23:39AM +0800, Haozhong Zhang wrote:
> On Mon, Sep 28, 2015 at 01:17:44PM -0300, Eduardo Habkost wrote:
> > On Mon, Sep 28, 2015 at 01:38:30PM +0800, Haozhong Zhang wrote:
> > > When creating a vcpu, we initialize its TSC rate to the value from
> &
On Mon, Sep 28, 2015 at 10:14:19PM +0200, Paolo Bonzini wrote:
>
>
> On 28/09/2015 07:38, Haozhong Zhang wrote:
> > +
> > +static inline void adjust_tsc_offset_guest(struct kvm_vcpu *vcpu,
> > + s64 adjustment)
> > +{
>
On Mon, Sep 28, 2015 at 10:12:37PM +0200, Paolo Bonzini wrote:
>
>
> On 28/09/2015 07:38, Haozhong Zhang wrote:
> >
> > -static u64 __scale_tsc(u64 ratio, u64 tsc)
> > -{
> > - u64 mult, frac, _tsc;
> > -
> > - mult = ratio >
On Mon, Sep 28, 2015 at 01:37:34PM -0300, Eduardo Habkost wrote:
> On Mon, Sep 28, 2015 at 01:38:31PM +0800, Haozhong Zhang wrote:
> > When a vcpu is created in KVM, its TSC rate is initially identical to
> > the host TSC rate. If its state is migrated to a vcpu on another
>
On Mon, Sep 28, 2015 at 08:27:02PM -0700, Eric Northup wrote:
> On Sun, Sep 27, 2015 at 10:38 PM, Haozhong Zhang
> wrote:
>
> > Both VMX and SVM propagate virtual_tsc_khz in the same way, so this
> > patch removes the call-back set_tsc_khz() and replaces it with
On Mon, Sep 28, 2015 at 08:28:57PM -0700, Eric Northup wrote:
> On Sun, Sep 27, 2015 at 10:38 PM, Haozhong Zhang
> wrote:
> >
> > The number of bits of the fractional part of the 64-bit TSC scaling
> > ratio in VMX and SVM is different. This patch makes the architecture
On Mon, Sep 28, 2015 at 09:00:39PM -0700, Eric Northup wrote:
> On Sun, Sep 27, 2015 at 10:37 PM, Haozhong Zhang
> wrote:
> > This patchset adds support for VMX TSC scaling feature which is
> > available on Intel Skylake CPU. The specification of VMX TSC scaling
> >
On Tue, Sep 29, 2015 at 03:02:07PM -0300, Eduardo Habkost wrote:
> On Tue, Sep 29, 2015 at 11:43:34AM +0800, Haozhong Zhang wrote:
> > On Mon, Sep 28, 2015 at 01:37:34PM -0300, Eduardo Habkost wrote:
> > > On Mon, Sep 28, 2015 at 01:38:31PM +0800, Haozhong Zhang wrote:
> [...]
On Tue, Sep 29, 2015 at 08:00:13PM +0100, Dr. David Alan Gilbert wrote:
> * Haozhong Zhang (haozhong.zh...@intel.com) wrote:
> > The newly added subsection 'vmstate_tsc_khz' in this patch results in
> > vcpu's TSC rate being saved on the source machine and loaded on
On Wed, Sep 30, 2015 at 05:36:11PM -0300, Eduardo Habkost wrote:
> On Wed, Sep 30, 2015 at 08:32:26AM +0800, Haozhong Zhang wrote:
> > > [...]
> > > > > Or maybe we shouldn't treat this as VM state, but as configuration,
> > > > > and
>
On Wed, Sep 30, 2015 at 09:07:08AM +0100, Dr. David Alan Gilbert wrote:
> * Haozhong Zhang (haozhong.zh...@intel.com) wrote:
> > On Tue, Sep 29, 2015 at 08:00:13PM +0100, Dr. David Alan Gilbert wrote:
> > > * Haozhong Zhang (haozhong.zh...@intel.com) wrote:
> > > &
On Mon, Oct 05, 2015 at 09:26:30PM +0200, Radim Krčmář wrote:
> 2015-09-28 13:38+0800, Haozhong Zhang:
> > This patch moves the field of TSC scaling ratio from the architecture
> > struct vcpu_svm to the common struct kvm_vcpu_arch.
> >
> > Signed-off-by: Haozhong Zhan
On Mon, Oct 05, 2015 at 09:53:26PM +0200, Radim Krčmář wrote:
> 2015-09-28 13:38+0800, Haozhong Zhang:
> > Both VMX and SVM propagate virtual_tsc_khz in the same way, so this
> > patch removes the call-back set_tsc_khz() and replaces it with a common
> > function.
> >
On Tue, Oct 06, 2015 at 12:40:49PM +0200, Paolo Bonzini wrote:
>
>
> On 06/10/2015 06:06, Haozhong Zhang wrote:
> > Alternatively, it's also possible to follow David's comment to use
> > divq on x86_64 to keep both precision and safety. On i386, it just
>
enabled and the migrated vcpu's TSC
rate will override the value specified by the cpu option
'tsc-freq'. Otherwise, the loading will be disabled.
The setting of vcpu's TSC rate in this patch duplicates the code in
kvm_arch_init_vcpu(), so we remove the latter one.
Signed-off-b
If vcpu's TSC rate is not specified by the cpu option 'tsc-freq', we
will use the value returned by KVM_GET_TSC_KHZ; otherwise, we use the
user-specified value.
Signed-off-by: Haozhong Zhang
---
target-i386/kvm.c | 33 +
1 file changed, 33 inse
types, they can enable it by giving a new cpu option
'save-tsc-freq'.
Signed-off-by: Haozhong Zhang
---
include/hw/i386/pc.h | 5 +
target-i386/cpu.c | 1 +
target-i386/cpu.h | 2 ++
target-i386/machine.c | 19 +++
4 files changed, 27 insertions(+)
dif
SC rate and override the TSC rate given by the cpu
option 'tsc-freq'.
Changes in v2:
* Add a pair of cpu options 'save-tsc-freq' and 'load-tsc-freq' to
control the migration of vcpu's TSC rate.
* Move all logic of setting TSC rate to target-i386.
This patch enhances dump_vmcs() to dump the value of TSC multiplier
field in VMCS.
Signed-off-by: Haozhong Zhang
---
arch/x86/kvm/vmx.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index a02b59c..66d25be 100644
--- a/arch/x86/kvm/vmx.c
+++ b
This patch makes kvm-intel module to load TSC scaling ratio into TSC
multiplier field of VMCS when a vcpu is loaded, so that TSC scaling
ratio can take effect if VMX TSC scaling is enabled.
Signed-off-by: Haozhong Zhang
---
arch/x86/kvm/vmx.c | 6 ++
1 file changed, 6 insertions(+)
diff
Both VMX and SVM scales the host TSC in the same way in call-back
read_l1_tsc(), so this patch moves the scaling logic from call-back
read_l1_tsc() to a common function kvm_read_l1_tsc().
Signed-off-by: Haozhong Zhang
---
arch/x86/kvm/lapic.c | 4 ++--
arch/x86/kvm/svm.c | 3
Both VMX and SVM calculate the tsc-offset in the same way, so this
patch removes the call-back compute_tsc_offset() and replaces it with a
common function kvm_compute_tsc_offset().
Signed-off-by: Haozhong Zhang
---
arch/x86/include/asm/kvm_host.h | 1 -
arch/x86/kvm/svm.c | 10
This patch makes KVM use virtual_tsc_khz rather than the host TSC rate
as vcpu's TSC rate to compute the time scale if TSC scaling is enabled.
Signed-off-by: Haozhong Zhang
---
arch/x86/kvm/x86.c | 6 --
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/x86.c b
s recommended by Paolo.
* Make kvm_set_tsc_khz() returns an error number so that ioctl
KVM_SET_TSC_KHZ does not return 0 if errors happen.
Reviewed-by: Eric Northup
Haozhong Zhang (12):
KVM: x86: Collect information for setting TSC scaling ratio
KVM: x86: Add a common TSC scaling ratio field in
The number of bits of the fractional part of the 64-bit TSC scaling
ratio in VMX and SVM is different. This patch makes the architecture
code to collect the number of fractional bits and other related
information into variables that can be accessed in the common code.
Signed-off-by: Haozhong
VMX and SVM calculate the TSC scaling ratio in a similar logic, so this
patch generalizes it to a common TSC scaling function.
Signed-off-by: Haozhong Zhang
---
arch/x86/kvm/svm.c | 48 +++--
arch/x86/kvm/x86.c | 45
Both VMX and SVM propagate virtual_tsc_khz in the same way, so this
patch removes the call-back set_tsc_khz() and replaces it with a common
function.
Signed-off-by: Haozhong Zhang
---
arch/x86/include/asm/kvm_host.h | 1 -
arch/x86/kvm/svm.c | 36
().
Signed-off-by: Haozhong Zhang
---
arch/x86/include/asm/kvm_host.h | 15 +--
arch/x86/kvm/svm.c | 10 ++
arch/x86/kvm/vmx.c | 4 ++--
include/linux/kvm_host.h| 16
4 files changed, 21 insertions(+), 24 deletions(-)
diff
This patch exhances kvm-intel module to enable VMX TSC scaling and
collects information of TSC scaling ratio during initialization.
Signed-off-by: Haozhong Zhang
---
arch/x86/include/asm/vmx.h | 3 +++
arch/x86/kvm/vmx.c | 19 ++-
2 files changed, 21 insertions(+), 1
This patch makes kvm-intel to return a scaled host TSC plus the TSC
offset when handling guest readings to MSR_IA32_TSC.
Signed-off-by: Haozhong Zhang
---
arch/x86/kvm/vmx.c | 9 +
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
This patch moves the field of TSC scaling ratio from the architecture
struct vcpu_svm to the common struct kvm_vcpu_arch.
Signed-off-by: Haozhong Zhang
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/svm.c | 23 +--
arch/x86/kvm/x86.c | 5
On Thu, Oct 22, 2015 at 04:45:21PM -0200, Eduardo Habkost wrote:
> On Tue, Oct 20, 2015 at 03:22:51PM +0800, Haozhong Zhang wrote:
> > This patchset enables QEMU to save/restore vcpu's TSC rate during the
> > migration. When cooperating with KVM which supports TSC scaling, gu
On Thu, Oct 22, 2015 at 04:11:37PM -0200, Eduardo Habkost wrote:
> On Tue, Oct 20, 2015 at 03:22:54PM +0800, Haozhong Zhang wrote:
> > Set vcpu's TSC rate to the migrated value (if any). If KVM supports TSC
> > scaling, guest programs will observe TSC increasing in the migrated
On Thu, Oct 22, 2015 at 04:11:37PM -0200, Eduardo Habkost wrote:
> On Tue, Oct 20, 2015 at 03:22:54PM +0800, Haozhong Zhang wrote:
> > Set vcpu's TSC rate to the migrated value (if any). If KVM supports TSC
> > scaling, guest programs will observe TSC increasing in the migrated
On Fri, Oct 23, 2015 at 12:06:50PM +0200, Joerg Roedel wrote:
> On Tue, Oct 20, 2015 at 03:39:00PM +0800, Haozhong Zhang wrote:
> > VMX TSC scaling shares some common logics with SVM TSC ratio which
> > is already supported by KVM. Patch 1 ~ 8 move those common logics from
>
On Fri, Oct 23, 2015 at 08:35:20AM -0200, Marcelo Tosatti wrote:
> On Thu, Oct 22, 2015 at 04:45:21PM -0200, Eduardo Habkost wrote:
> > On Tue, Oct 20, 2015 at 03:22:51PM +0800, Haozhong Zhang wrote:
> > > This patchset enables QEMU to save/restore vcpu's TSC rate during th
On Fri, Oct 23, 2015 at 02:46:19PM +0200, Joerg Roedel wrote:
> On Fri, Oct 23, 2015 at 08:32:28PM +0800, Haozhong Zhang wrote:
> > No, since I don't have AMD machines at hand. The modifications to SVM
> > code are mostly lifting common code with VMX TSC scaling code, so it
&
Following is how I test this patchset. It should also apply to AMD
machines by replacing Intel with AMD and VMX TSC scaling with SVM TSC
ratio.
* Hardware Requirements
1) Two machines with Intel CPUs, called M_A and M_B below.
2) TSC frequency of CPUs on M_A is different from CPUs on M_B.
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