linux-kernel - Re: [PATCH RFC 00/10] Intel EPT-Based Sub-page Write Protection Support.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 18 Oct 2017 00:09:36 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Zhang Yi <yi.z.zhang@...ux.intel.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        pbonzini@...hat.com, rkrcmar@...hat.com
Subject: Re: [PATCH RFC 00/10] Intel EPT-Based Sub-page Write Protection
 Support.

> We introduced 2 ioctls to let user application to set/get subpage write protection bitmap per gfn, each gfn corresponds to a bitmap.
> The user application, qemu, or some other security control daemon. will set the protection bitmap via this ioctl.
> the API defined as:
> 	struct kvm_subpage {
> 		__u64 base_gfn;
> 		__u64 npages;
> 		/* sub-page write-access bitmap array */
> 		__u32 access_map[SUBPAGE_MAX_BITMAP];
> 		}sp;
> 	kvm_vm_ioctl(s, KVM_SUBPAGES_SET_ACCESS, &sp)
> 	kvm_vm_ioctl(s, KVM_SUBPAGES_GET_ACCESS, &sp)

What is the use case for this feature?