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Groups > linux.kernel > #1234708
| From | Haozhong Zhang <haozhong.zhang@intel.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 00/12] KVM: x86: add support for VMX TSC scaling |
| Date | 2015-09-29 06:10 +0200 |
| Message-ID | <qdUoO-3IA-3@gated-at.bofh.it> (permalink) |
| References | <qdzkm-4Rn-5@gated-at.bofh.it> <qdUoO-3IA-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Mon, Sep 28, 2015 at 09:00:39PM -0700, Eric Northup wrote: > On Sun, Sep 27, 2015 at 10:37 PM, Haozhong Zhang > <haozhong.zhang@intel.com> 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://www.intel.com/content/www/us/en/processors/timestamp-counter-scaling-virtualization-white-paper.html > > > > VMX TSC scaling allows guest TSC which is read by guest rdtsc(p) > > instructions increases in a rate that is customized by the hypervisor > > and can be different than the host TSC rate. Basically, VMX TSC > > scaling adds a 64-bit field called TSC multiplier in VMCS so that, if > > VMX TSC scaling is enabled, TSC read by guest rdtsc(p) instructions > > will be calculated by the following formula: > > > > guest EDX:EAX = (Host TSC * TSC multiplier) >> 48 + VMX TSC Offset > > > > where, Host TSC = Host MSR_IA32_TSC + Host MSR_IA32_TSC_ADJUST. > > > > This patchset, when cooperating with another QEMU patchset (sent in > > another email "target-i386: save/restore vcpu's TSC rate during > > migration"), allows guest programs observe a consistent TSC rate even > > though they are migrated among machines with different host TSC rates. > > > > VMX TSC scaling shares some common logics with SVM TSC scaling which > > is already supported by KVM. Patch 1 ~ 8 move those common logics from > > SVM code to the common code. Upon them, patch 9 ~ 12 add VMX-specific > > support for VMX TSC scaling. > > reviewed-by: Eric Northup <digitaleric@google.com> > Thank you for the review! > > > > 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 scaling function > > KVM: x86: Replace call-back set_tsc_khz() with a common function > > KVM: x86: Replace call-back compute_tsc_offset() with a common function > > KVM: x86: Move TSC scaling logic out of call-back adjust_tsc_offset() > > KVM: x86: Move TSC scaling logic out of call-back read_l1_tsc() > > KVM: x86: Use the correct vcpu's TSC rate to compute time scale > > KVM: VMX: Enable and initialize VMX TSC scaling > > KVM: VMX: Setup TSC scaling ratio when a vcpu is loaded > > KVM: VMX: Use a scaled host TSC for guest readings of MSR_IA32_TSC > > KVM: VMX: Dump TSC multiplier in dump_vmcs() > > > > arch/x86/include/asm/kvm_host.h | 24 +++---- > > arch/x86/include/asm/vmx.h | 4 +- > > arch/x86/kvm/lapic.c | 5 +- > > arch/x86/kvm/svm.c | 113 +++-------------------------- > > arch/x86/kvm/vmx.c | 60 ++++++++-------- > > arch/x86/kvm/x86.c | 154 +++++++++++++++++++++++++++++++++++++--- > > include/linux/kvm_host.h | 21 +++++- > > 7 files changed, 221 insertions(+), 160 deletions(-) > > > > -- > > 2.4.8 > > > > -- > > To unsubscribe from this list: send the line "unsubscribe kvm" in > > the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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[PATCH 00/12] KVM: x86: add support for VMX TSC scaling Haozhong Zhang <haozhong.zhang@intel.com> - 2015-09-28 07:40 +0200
[PATCH 07/12] KVM: x86: Move TSC scaling logic out of call-back read_l1_tsc() Haozhong Zhang <haozhong.zhang@intel.com> - 2015-09-28 07:40 +0200
[PATCH 11/12] KVM: VMX: Use a scaled host TSC for guest readings of MSR_IA32_TSC Haozhong Zhang <haozhong.zhang@intel.com> - 2015-09-28 07:40 +0200
[PATCH 06/12] KVM: x86: Move TSC scaling logic out of call-back adjust_tsc_offset() Haozhong Zhang <haozhong.zhang@intel.com> - 2015-09-28 07:40 +0200
Re: [PATCH 06/12] KVM: x86: Move TSC scaling logic out of call-back adjust_tsc_offset() Paolo Bonzini <pbonzini@redhat.com> - 2015-09-28 22:20 +0200
Re: [PATCH 06/12] KVM: x86: Move TSC scaling logic out of call-back adjust_tsc_offset() Haozhong Zhang <haozhong.zhang@intel.com> - 2015-09-29 03:50 +0200
[PATCH 01/12] KVM: x86: Collect information for setting TSC scaling ratio Haozhong Zhang <haozhong.zhang@intel.com> - 2015-09-28 07:40 +0200
Re: [PATCH 01/12] KVM: x86: Collect information for setting TSC scaling ratio Eric Northup <digitaleric@google.com> - 2015-09-29 05:30 +0200
Re: [PATCH 01/12] KVM: x86: Collect information for setting TSC scaling ratio Haozhong Zhang <haozhong.zhang@intel.com> - 2015-09-29 06:10 +0200
[PATCH 02/12] KVM: x86: Add a common TSC scaling ratio field in kvm_vcpu_arch Haozhong Zhang <haozhong.zhang@intel.com> - 2015-09-28 07:50 +0200
Re: [PATCH 02/12] KVM: x86: Add a common TSC scaling ratio field in kvm_vcpu_arch Radim Krčmář <rkrcmar@redhat.com> - 2015-10-05 21:30 +0200
[PATCH 08/12] KVM: x86: Use the correct vcpu's TSC rate to compute time scale Haozhong Zhang <haozhong.zhang@intel.com> - 2015-09-28 07:50 +0200
Re: [PATCH 08/12] KVM: x86: Use the correct vcpu's TSC rate to compute time scale Radim Krčmář <rkrcmar@redhat.com> - 2015-10-05 22:20 +0200
[PATCH 05/12] KVM: x86: Replace call-back compute_tsc_offset() with a common function Haozhong Zhang <haozhong.zhang@intel.com> - 2015-09-28 07:50 +0200
[PATCH 03/12] KVM: x86: Add a common TSC scaling function Haozhong Zhang <haozhong.zhang@intel.com> - 2015-09-28 07:50 +0200
Re: [PATCH 03/12] KVM: x86: Add a common TSC scaling function Paolo Bonzini <pbonzini@redhat.com> - 2015-09-28 22:20 +0200
Re: [PATCH 03/12] KVM: x86: Add a common TSC scaling function Haozhong Zhang <haozhong.zhang@intel.com> - 2015-09-29 04:00 +0200
[PATCH 10/12] KVM: VMX: Setup TSC scaling ratio when a vcpu is loaded Haozhong Zhang <haozhong.zhang@intel.com> - 2015-09-28 07:50 +0200
[PATCH 04/12] KVM: x86: Replace call-back set_tsc_khz() with a common function Haozhong Zhang <haozhong.zhang@intel.com> - 2015-09-28 07:50 +0200
Re: [PATCH 04/12] KVM: x86: Replace call-back set_tsc_khz() with a common function Haozhong Zhang <haozhong.zhang@intel.com> - 2015-09-29 05:50 +0200
Re: [PATCH 04/12] KVM: x86: Replace call-back set_tsc_khz() with a common function Radim Krčmář <rkrcmar@redhat.com> - 2015-10-05 22:00 +0200
Re: [PATCH 04/12] KVM: x86: Replace call-back set_tsc_khz() with a common function David Matlack <dmatlack@google.com> - 2015-10-05 22:50 +0200
Re: [PATCH 00/12] KVM: x86: add support for VMX TSC scaling Haozhong Zhang <haozhong.zhang@intel.com> - 2015-09-29 06:10 +0200
Re: [PATCH 00/12] KVM: x86: add support for VMX TSC scaling Eric Northup <digitaleric@google.com> - 2015-09-29 06:10 +0200
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