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KVM: selftests: Don't require THP to run tests

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Unless we want to test with THP, then we shouldn't require it to be
configured by the host kernel. Unfortunately, even advising with
MADV_NOHUGEPAGE does require it, so check for THP first in order
to avoid madvise failing with EINVAL.

Signed-off-by: Andrew Jones <drjones@redhat.com>
Message-Id: <20201029201703.102716-2-drjones@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Andrew Jones 2020-10-29 21:17:00 +01:00 committed by Paolo Bonzini
parent 064eedf2c5
commit 0f55b67e5a
1 changed files with 16 additions and 7 deletions
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23
tools/testing/selftests/kvm/lib/kvm_util.c
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@ -14,6 +14,7 @@
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <linux/kernel.h>
#define KVM_UTIL_PGS_PER_HUGEPG 512
@ -664,13 +665,21 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm,
/* As needed perform madvise */
if (src_type == VM_MEM_SRC_ANONYMOUS || src_type == VM_MEM_SRC_ANONYMOUS_THP) {
ret = madvise(region->host_mem, npages * vm->page_size,
src_type == VM_MEM_SRC_ANONYMOUS ? MADV_NOHUGEPAGE : MADV_HUGEPAGE);
TEST_ASSERT(ret == 0, "madvise failed,\n"
" addr: %p\n"
" length: 0x%lx\n"
" src_type: %x",
region->host_mem, npages * vm->page_size, src_type);
struct stat statbuf;
ret = stat("/sys/kernel/mm/transparent_hugepage", &statbuf);
TEST_ASSERT(ret == 0 || (ret == -1 && errno == ENOENT),
"stat /sys/kernel/mm/transparent_hugepage");
TEST_ASSERT(ret == 0 || src_type != VM_MEM_SRC_ANONYMOUS_THP,
"VM_MEM_SRC_ANONYMOUS_THP requires THP to be configured in the host kernel");
if (ret == 0) {
ret = madvise(region->host_mem, npages * vm->page_size,
src_type == VM_MEM_SRC_ANONYMOUS ? MADV_NOHUGEPAGE : MADV_HUGEPAGE);
TEST_ASSERT(ret == 0, "madvise failed, addr: %p length: 0x%lx src_type: %x",
region->host_mem, npages * vm->page_size, src_type);
}
}
region->unused_phy_pages = sparsebit_alloc();