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From: Yang Weijiang <weijiang.yang@intel.com>
To: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Yang Weijiang <weijiang.yang@intel.com>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	pbonzini@redhat.com, jmattson@google.com,
	yu.c.zhang@linux.intel.com, alazar@bitdefender.com,
	edwin.zhai@intel.com
Subject: Re: [RESEND PATCH v10 05/10] x86: spp: Introduce user-space SPP IOCTLs
Date: Mon, 13 Jan 2020 16:21:32 +0800
Message-ID: <20200113082132.GG12253@local-michael-cet-test.sh.intel.com> (raw)
In-Reply-To: <20200110181053.GH21485@linux.intel.com>

On Fri, Jan 10, 2020 at 10:10:53AM -0800, Sean Christopherson wrote:
> On Thu, Jan 02, 2020 at 02:13:14PM +0800, Yang Weijiang wrote:
> > User application, e.g., QEMU or VMI, must initialize SPP
> > before gets/sets SPP subpages, the dynamic initialization is to
> > reduce the extra storage cost if the SPP feature is not not used.
> > 
> > Co-developed-by: He Chen <he.chen@linux.intel.com>
> > Signed-off-by: He Chen <he.chen@linux.intel.com>
> > Co-developed-by: Zhang Yi <yi.z.zhang@linux.intel.com>
> > Signed-off-by: Zhang Yi <yi.z.zhang@linux.intel.com>
> > Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
> > ---
> >  arch/x86/include/asm/kvm_host.h |  4 ++
> >  arch/x86/kvm/mmu/spp.c          | 44 +++++++++++++++
> >  arch/x86/kvm/mmu/spp.h          |  9 ++++
> >  arch/x86/kvm/vmx/vmx.c          | 15 ++++++
> >  arch/x86/kvm/x86.c              | 95 ++++++++++++++++++++++++++++++++-
> >  include/uapi/linux/kvm.h        |  3 ++
> >  6 files changed, 169 insertions(+), 1 deletion(-)
> > 
> > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> > index f5145b86d620..c7a9f03f39a7 100644
> > --- a/arch/x86/include/asm/kvm_host.h
> > +++ b/arch/x86/include/asm/kvm_host.h
> > @@ -1238,6 +1238,10 @@ struct kvm_x86_ops {
> >  
> >  	bool (*apic_init_signal_blocked)(struct kvm_vcpu *vcpu);
> >  	int (*enable_direct_tlbflush)(struct kvm_vcpu *vcpu);
> > +
> > +	int (*init_spp)(struct kvm *kvm);
> > +	int (*flush_subpages)(struct kvm *kvm, u64 gfn, u32 npages);
> > +	int (*get_inst_len)(struct kvm_vcpu *vcpu);
> 
> If this is necessary, which hopefully it isn't, then get_insn_len() to be
> consistent with other KVM nomenclature.
>
Yep, will change it.

> A comment for the series overall, it needs a lot of work to properly order
> code between patches.  E.g. this patch introduces get_inst_len() without
> any justification in the changelog and without a user.  At best it's
> confusing, at worst this series will be impossible to bisect.

I'll double check the patch and add more comments on some confusing
points. Meanwhile, will re-order some code to make the serial testable,
thanks a lot for your careful review!


  reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-02  6:13 [RESEND PATCH v10 00/10] Enable Sub-Page Write Protection Support Yang Weijiang
2020-01-02  6:13 ` [RESEND PATCH v10 01/10] Documentation: Add EPT based Subpage Protection and related APIs Yang Weijiang
2020-01-02  6:13 ` [RESEND PATCH v10 02/10] vmx: spp: Add control flags for Sub-Page Protection(SPP) Yang Weijiang
2020-01-10 16:58   ` Sean Christopherson
2020-01-13  5:44     ` Yang Weijiang
2020-01-02  6:13 ` [RESEND PATCH v10 03/10] mmu: spp: Add SPP Table setup functions Yang Weijiang
2020-01-10 17:26   ` Sean Christopherson
2020-01-13  6:00     ` Yang Weijiang
2020-01-10 17:40   ` Sean Christopherson
2020-01-13  6:04     ` Yang Weijiang
2020-01-02  6:13 ` [RESEND PATCH v10 04/10] mmu: spp: Add functions to operate SPP access bitmap Yang Weijiang
2020-01-10 17:38   ` Sean Christopherson
2020-01-13  6:15     ` Yang Weijiang
2020-01-02  6:13 ` [RESEND PATCH v10 05/10] x86: spp: Introduce user-space SPP IOCTLs Yang Weijiang
2020-01-10 18:10   ` Sean Christopherson
2020-01-13  8:21     ` Yang Weijiang [this message]
2020-01-02  6:13 ` [RESEND PATCH v10 06/10] vmx: spp: Set up SPP paging table at vmentry/vmexit Yang Weijiang
2020-01-10 17:55   ` Sean Christopherson
2020-01-13  6:50     ` Yang Weijiang
2020-01-21 14:01     ` Paolo Bonzini
2020-01-10 18:04   ` Sean Christopherson
2020-01-13  8:10     ` Yang Weijiang
2020-01-13 17:33       ` Sean Christopherson
2020-01-13 18:55         ` Adalbert Lazăr
2020-01-13 21:47           ` Sean Christopherson
2020-01-14  3:08         ` Yang Weijiang
2020-01-14 18:58           ` Sean Christopherson
2020-01-15  1:36             ` Yang Weijiang
2020-01-21 14:14             ` Paolo Bonzini
2020-01-02  6:13 ` [RESEND PATCH v10 07/10] mmu: spp: Enable Lazy mode SPP protection Yang Weijiang
2020-01-02  6:13 ` [RESEND PATCH v10 08/10] mmu: spp: Handle SPP protected pages when VM memory changes Yang Weijiang
2020-01-02  6:13 ` [RESEND PATCH v10 09/10] x86: spp: Add SPP protection check in emulation Yang Weijiang
2020-01-02  6:13 ` [RESEND PATCH v10 10/10] kvm: selftests: selftest for Sub-Page protection Yang Weijiang
  -- strict thread matches above, loose matches on Subject: below --
2020-01-02  5:18 [RESEND PATCH v10 00/10] Enable Sub-Page Write Protection Support Yang Weijiang
2020-01-02  5:18 ` [RESEND PATCH v10 05/10] x86: spp: Introduce user-space SPP IOCTLs Yang Weijiang

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