Il 01/04/2014 11:46, Feng Wu ha scritto:
Feng Wu (4):
KVM: Remove SMAP bit from CR4_RESERVED_BITS.
KVM: Add SMAP support when setting CR4
KVM: Disable SMAP for guests in EPT realmode and EPT unpaging mode
KVM: expose SMAP feature to guest
Hi,
I prepared some testcases. You can find them in branch "smap" of
git://git.kernel.org/pub/scm/virt/kvm/kvm-unit-tests.git
To compile them for 32-bits:
git clean -xdf
./configure --arch=i386
make
./x86-run x86/smap.flat -cpu host
For 64-bits:
git clean -xdf
./configure
make
./x86-run x86/smap.flat -cpu host
I tried them with QEMU and they all pass. The output should be
something like this:
enabling apic
paging enabled
cr0 = 80010011
cr3 = 7fff000
cr4 = 10
testing without INVLPG
PASS: write to supervisor page
PASS: read from user page with AC=1
PASS: read from user page with AC=0
PASS: write to user page with AC=1
PASS: read from user page with AC=0
PASS: write to user stack with AC=1
PASS: write to user stack with AC=0
PASS: executing on user page with AC=0
testing with INVLPG
PASS: write to supervisor page
PASS: read from user page with AC=1
PASS: read from user page with AC=0
PASS: write to user page with AC=1
PASS: read from user page with AC=0
PASS: write to user stack with AC=1
PASS: write to user stack with AC=0
PASS: executing on user page with AC=0
SUMMARY: 16 tests, 0 failures
Please test them (both 32- and 64-bits) with both ept=1 and ept=0. If
the tests pass, the series is okay.
The only part that is not covered is the implicit kernel accesses at
CPL=3, which QEMU doesn't implement that (I fixed it, but didn't have
time to think about tests). Since I'm going on vacation next week, I
wanted to throw this out today. I'll post the test patches when I'm back.
Paolo
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