Re: [PATCH 08/15] KVM: selftests: Use perf util's per-vCPU GPA/pages in demand paging test
From: Ben Gardon <hidden>
Date: 2021-02-11 01:24:42
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On Wed, Feb 10, 2021 at 3:06 PM Sean Christopherson [off-list ref] wrote:
Grab the per-vCPU GPA and number of pages from perf_util in the demand paging test instead of duplicating perf_util's calculations. Note, this may or may not result in a functional change. It's not clear that the test's calculations are guaranteed to yield the same value as perf_util, e.g. if guest_percpu_mem_size != vcpu_args->pages. Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Ben Gardon <redacted>
quoted hunk ↗ jump to hunk
--- .../selftests/kvm/demand_paging_test.c | 20 +++++-------------- 1 file changed, 5 insertions(+), 15 deletions(-)diff --git a/tools/testing/selftests/kvm/demand_paging_test.c b/tools/testing/selftests/kvm/demand_paging_test.c index 5f7a229c3af1..0cbf111e6c21 100644 --- a/tools/testing/selftests/kvm/demand_paging_test.c +++ b/tools/testing/selftests/kvm/demand_paging_test.c@@ -294,24 +294,13 @@ static void run_test(enum vm_guest_mode mode, void *arg) TEST_ASSERT(pipefds, "Unable to allocate memory for pipefd"); for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++) { - vm_paddr_t vcpu_gpa; + struct perf_test_vcpu_args *vcpu_args; void *vcpu_hva; - uint64_t vcpu_mem_size; - - if (p->partition_vcpu_memory_access) { - vcpu_gpa = guest_test_phys_mem + - (vcpu_id * guest_percpu_mem_size); - vcpu_mem_size = guest_percpu_mem_size; - } else { - vcpu_gpa = guest_test_phys_mem; - vcpu_mem_size = guest_percpu_mem_size * nr_vcpus; - } - PER_VCPU_DEBUG("Added VCPU %d with test mem gpa [%lx, %lx)\n", - vcpu_id, vcpu_gpa, vcpu_gpa + vcpu_mem_size); + vcpu_args = &perf_test_args.vcpu_args[vcpu_id]; /* Cache the HVA pointer of the region */ - vcpu_hva = addr_gpa2hva(vm, vcpu_gpa); + vcpu_hva = addr_gpa2hva(vm, vcpu_args->gpa); /* * Set up user fault fd to handle demand paging@@ -325,7 +314,8 @@ static void run_test(enum vm_guest_mode mode, void *arg) &uffd_handler_threads[vcpu_id], pipefds[vcpu_id * 2], p->uffd_delay, &uffd_args[vcpu_id], - vcpu_hva, vcpu_mem_size); + vcpu_hva, + vcpu_args->pages * perf_test_args.guest_page_size); if (r < 0) exit(-r); } --2.30.0.478.g8a0d178c01-goog