linux.git/tools/testing/selftests/kvm/Makefile, branch v5.10

KVM: selftests: Introduce the dirty log perf test

2020-11-08T11:04:08+00:00

The dirty log perf test will time verious dirty logging operations
(enabling dirty logging, dirtying memory, getting the dirty log,
clearing the dirty log, and disabling dirty logging) in order to
quantify dirty logging performance. This test can be used to inform
future performance improvements to KVM's dirty logging infrastructure.

This series was tested by running the following invocations on an Intel
Skylake machine:
dirty_log_perf_test -b 20m -i 100 -v 64
dirty_log_perf_test -b 20g -i 5 -v 4
dirty_log_perf_test -b 4g -i 5 -v 32
demand_paging_test -b 20m -v 64
demand_paging_test -b 20g -v 4
demand_paging_test -b 4g -v 32
All behaved as expected.

Signed-off-by: Ben Gardon 
Message-Id: <20201027233733.1484855-6-bgardon@google.com>
Signed-off-by: Paolo Bonzini

KVM: selftests: Use a single binary for dirty/clear log test

2020-11-08T11:03:31+00:00

Remove the clear_dirty_log test, instead merge it into the existing
dirty_log_test.  It should be cleaner to use this single binary to do
both tests, also it's a preparation for the upcoming dirty ring test.

The default behavior will run all the modes in sequence.

Reviewed-by: Andrew Jones 
Signed-off-by: Peter Xu 
Message-Id: <20201001012233.6013-1-peterx@redhat.com>
Signed-off-by: Paolo Bonzini

KVM: selftests: Add blessed SVE registers to get-reg-list

2020-11-08T11:03:02+00:00

Add support for the SVE registers to get-reg-list and create a
new test, get-reg-list-sve, which tests them when running on a
machine with SVE support.

Signed-off-by: Andrew Jones 
Message-Id: <20201029201703.102716-5-drjones@redhat.com>
Signed-off-by: Paolo Bonzini

KVM: selftests: Add aarch64 get-reg-list test

2020-11-08T11:02:45+00:00

Check for KVM_GET_REG_LIST regressions. The blessed list was
created by running on v4.15 with the --core-reg-fixup option.
The following script was also used in order to annotate system
registers with their names when possible. When new system
registers are added the names can just be added manually using
the same grep.

while read reg; do
	if [[ ! $reg =~ ARM64_SYS_REG ]]; then
		printf "\t$reg\n"
		continue
	fi
	encoding=$(echo "$reg" | sed "s/ARM64_SYS_REG(//;s/),//")
	if ! name=$(grep "$encoding" ../../../../arch/arm64/include/asm/sysreg.h); then
		printf "\t$reg\n"
		continue
	fi
	name=$(echo "$name" | sed "s/.*SYS_//;s/[\t ]*sys_reg($encoding)$//")
	printf "\t$reg\t/* $name */\n"
done < <(aarch64/get-reg-list --core-reg-fixup --list)

Signed-off-by: Andrew Jones 
Message-Id: <20201029201703.102716-3-drjones@redhat.com>
Signed-off-by: Paolo Bonzini

selftests: kvm: test enforcement of paravirtual cpuid features

2020-11-08T11:02:16+00:00

Add a set of tests that ensure the guest cannot access paravirtual msrs
and hypercalls that have been disabled in the KVM_CPUID_FEATURES leaf.
Expect a #GP in the case of msr accesses and -KVM_ENOSYS from
hypercalls.

Cc: Jim Mattson 
Signed-off-by: Oliver Upton 
Reviewed-by: Peter Shier 
Reviewed-by: Aaron Lewis 
Message-Id: <20201027231044.655110-7-oupton@google.com>
Signed-off-by: Paolo Bonzini

selftests: kvm: Add exception handling to selftests

2020-11-08T11:02:15+00:00

Add the infrastructure needed to enable exception handling in selftests.
This allows any of the exception and interrupt vectors to be overridden
in the guest.

Signed-off-by: Aaron Lewis 
Reviewed-by: Alexander Graf 
Message-Id: <20201012194716.3950330-4-aaronlewis@google.com>
Signed-off-by: Paolo Bonzini

KVM: selftests: test behavior of unmapped L2 APIC-access address

2020-10-31T14:04:38+00:00

Add a regression test for commit 671ddc700fd0 ("KVM: nVMX: Don't leak
L1 MMIO regions to L2").

First, check to see that an L2 guest can be launched with a valid
APIC-access address that is backed by a page of L1 physical memory.

Next, set the APIC-access address to a (valid) L1 physical address
that is not backed by memory. KVM can't handle this situation, so
resuming L2 should result in a KVM exit for internal error
(emulation).

Signed-off-by: Jim Mattson 
Reviewed-by: Ricardo Koller 
Reviewed-by: Peter Shier 
Message-Id: <20201026180922.3120555-1-jmattson@google.com>
Signed-off-by: Paolo Bonzini

KVM: x86: do not attempt TSC synchronization on guest writes

2020-09-28T11:59:52+00:00

KVM special-cases writes to MSR_IA32_TSC so that all CPUs have
the same base for the TSC.  This logic is complicated, and we
do not want it to have any effect once the VM is started.

In particular, if any guest started to synchronize its TSCs
with writes to MSR_IA32_TSC rather than MSR_IA32_TSC_ADJUST,
the additional effect of kvm_write_tsc code would be uncharted
territory.

Therefore, this patch makes writes to MSR_IA32_TSC behave
essentially the same as writes to MSR_IA32_TSC_ADJUST when
they come from the guest.  A new selftest (which passes
both before and after the patch) checks the current semantics
of writes to MSR_IA32_TSC and MSR_IA32_TSC_ADJUST originating
from both the host and the guest.

Upcoming work to remove the special side effects
of host-initiated writes to MSR_IA32_TSC and MSR_IA32_TSC_ADJUST
will be able to build onto this test, adjusting the host side
to use the new APIs and achieve the same effect.

Signed-off-by: Paolo Bonzini

KVM: selftests: Add test for user space MSR handling

2020-09-28T11:58:45+00:00

Now that we have the ability to handle MSRs from user space and also to
select which ones we do want to prevent in-kernel KVM code from handling,
let's add a selftest to show case and verify the API.

Signed-off-by: Alexander Graf 

Message-Id: <20200925143422.21718-9-graf@amazon.com>
Signed-off-by: Paolo Bonzini

KVM: selftests: Fix build with "make ARCH=x86_64"

2020-06-05T15:15:55+00:00

Marcelo reports that kvm selftests fail to build with
"make ARCH=x86_64":

gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99
 -fno-stack-protector -fno-PIE -I../../../../tools/include
 -I../../../../tools/arch/x86_64/include  -I../../../../usr/include/
 -Iinclude -Ilib -Iinclude/x86_64 -I.. -c lib/kvm_util.c
 -o /var/tmp/20200604202744-bin/lib/kvm_util.o

In file included from lib/kvm_util.c:11:
include/x86_64/processor.h:14:10: fatal error: asm/msr-index.h: No such
 file or directory

 #include 
          ^~~~~~~~~~~~~~~~~
compilation terminated.

"make ARCH=x86", however, works. The problem is that arch specific headers
for x86_64 live in 'tools/arch/x86/include', not in
'tools/arch/x86_64/include'.

Fixes: 66d69e081b52 ("selftests: fix kvm relocatable native/cross builds and installs")
Reported-by: Marcelo Bandeira Condotta 
Signed-off-by: Vitaly Kuznetsov 
Message-Id: <20200605142028.550068-1-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini