linux-kernel - [PATCH 0/1] selftest for SPP feature

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Message-Id: <20190619020300.30392-1-weijiang.yang@intel.com>
Date:   Wed, 19 Jun 2019 10:02:59 +0800
From:   Weijiang Yang <weijiang.yang@...el.com>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        pbonzini@...hat.com, mst@...hat.com, rkrcmar@...hat.com,
        jmattson@...gle.com, yu.c.zhang@...el.com
Cc:     Yang Weijiang <weijiang.yang@...el.com>
Subject: [PATCH 0/1] selftest for SPP feature

From: Yang Weijiang <weijiang.yang@...el.com>

Sub-Page Permission(SPP) is to protect finer granularity subpages
(128Byte each) within a 4KB page. 
There're three specific ioctls for the feature in KVM:
KVM_INIT_SPP - initialize SPP runtime environment 
KVM_SUBPAGES_SET_ACCESS - set SPP protection for guest page
KVM_SUBPAGES_GET_ACCESS - get SPP permission bits for guest page
This selftest uses these ioctls to verify whether SPP is working
on SPP powered platforms.

test results:
--------------------------------------------------------------------------
SPP protected zone: size = 4096, gva = 0x700000, gpa = 0x10001000, hva =
0x0x7f6ff3b92000
SPP initialized successfully.
set spp protection info: gfn = 0x10001, access = 0x0, npages = 1
get spp protection info: gfn = 0x10001, access = 0x0, npages = 1
got matched subpage permission vector.
expect VM exits caused by SPP below.
1 - exit reason: SPP
2 - exit reason: SPP
3 - exit reason: SPP
4 - exit reason: SPP
5 - exit reason: SPP
6 - exit reason: SPP
7 - exit reason: SPP
8 - exit reason: SPP
9 - exit reason: SPP
10 - exit reason: SPP
11 - exit reason: SPP
12 - exit reason: SPP
13 - exit reason: SPP
14 - exit reason: SPP
15 - exit reason: SPP
16 - exit reason: SPP
17 - exit reason: SPP
18 - exit reason: SPP
19 - exit reason: SPP
20 - exit reason: SPP
21 - exit reason: SPP
22 - exit reason: SPP
23 - exit reason: SPP
24 - exit reason: SPP
25 - exit reason: SPP
26 - exit reason: SPP
27 - exit reason: SPP
28 - exit reason: SPP
29 - exit reason: SPP
30 - exit reason: SPP
31 - exit reason: SPP
32 - exit reason: SPP
total EPT violation count: 32
unset SPP protection at gfn: 0x10001
expect NO VM exits caused by SPP below.
completed SPP test successfully!
------------------------------------------------------------------------


Yang Weijiang (1):
  kvm: selftests: add selftest for SPP feature

 tools/testing/selftests/kvm/Makefile          |   1 +
 tools/testing/selftests/kvm/lib/kvm_util.c    |   1 +
 tools/testing/selftests/kvm/x86_64/spp_test.c | 206 ++++++++++++++++++
 3 files changed, 208 insertions(+)
 create mode 100644 tools/testing/selftests/kvm/x86_64/spp_test.c

-- 
2.17.2