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tests: kvm: Check for a kernel warning

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When running with /sys/module/kvm_intel/parameters/unrestricted_guest=N,
test that a kernel warning does not occur informing us that
vcpu->mmio_needed=1.  This can happen when KVM_RUN is called after a
triple fault.
This test was made to detect a bug that was reported by Syzkaller
(https://groups.google.com/forum/#!topic/syzkaller/lHfau8E3SOE) and
fixed with commit bbeac2830f ("KVM: X86: Fix residual mmio emulation
request to userspace").

Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Peter Shier <pshier@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Aaron Lewis
2019-05-31 14:14:52 +00:00
committed by Paolo Bonzini
parent 61cfcd545e
commit 9dba988edb
7 changed files with 184 additions and 0 deletions
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36
tools/testing/selftests/kvm/lib/kvm_util.c
View File

@@ -1583,3 +1583,39 @@ void *addr_gva2hva(struct kvm_vm *vm, vm_vaddr_t gva)
{
return addr_gpa2hva(vm, addr_gva2gpa(vm, gva));
}
/*
* Is Unrestricted Guest
*
* Input Args:
* vm - Virtual Machine
*
* Output Args: None
*
* Return: True if the unrestricted guest is set to 'Y', otherwise return false.
*
* Check if the unrestricted guest flag is enabled.
*/
bool vm_is_unrestricted_guest(struct kvm_vm *vm)
{
char val = 'N';
size_t count;
FILE *f;
if (vm == NULL) {
/* Ensure that the KVM vendor-specific module is loaded. */
f = fopen(KVM_DEV_PATH, "r");
TEST_ASSERT(f != NULL, "Error in opening KVM dev file: %d",
errno);
fclose(f);
}
f = fopen("/sys/module/kvm_intel/parameters/unrestricted_guest", "r");
if (f) {
count = fread(&val, sizeof(char), 1, f);
TEST_ASSERT(count == 1, "Unable to read from param file.");
fclose(f);
}
return val == 'Y';
}