linux-kernel - [PATCH v4 11/12] KVM: selftests: set KVM_GMEM_NO_DIRECT

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Message-ID: <20250221160728.1584559-12-roypat@amazon.co.uk>
Date: Fri, 21 Feb 2025 16:07:24 +0000
From: Patrick Roy <roypat@...zon.co.uk>
To: <rppt@...nel.org>, <david@...hat.com>, <seanjc@...gle.com>
CC: Patrick Roy <roypat@...zon.co.uk>, <pbonzini@...hat.com>,
	<corbet@....net>, <willy@...radead.org>, <akpm@...ux-foundation.org>,
	<song@...nel.org>, <jolsa@...nel.org>, <ast@...nel.org>,
	<daniel@...earbox.net>, <andrii@...nel.org>, <martin.lau@...ux.dev>,
	<eddyz87@...il.com>, <yonghong.song@...ux.dev>, <john.fastabend@...il.com>,
	<kpsingh@...nel.org>, <sdf@...ichev.me>, <haoluo@...gle.com>,
	<Liam.Howlett@...cle.com>, <lorenzo.stoakes@...cle.com>, <vbabka@...e.cz>,
	<jannh@...gle.com>, <shuah@...nel.org>, <kvm@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-fsdevel@...r.kernel.org>, <linux-mm@...ck.org>, <bpf@...r.kernel.org>,
	<linux-kselftest@...r.kernel.org>, <tabba@...gle.com>, <jgowans@...zon.com>,
	<graf@...zon.com>, <kalyazin@...zon.com>, <xmarcalx@...zon.com>,
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Subject: [PATCH v4 11/12] KVM: selftests: set KVM_GMEM_NO_DIRECT_MAP in mem conversion tests

Cover the scenario that the guest can fault in and write gmem-backed
guest memory even if its direct map removed.

Signed-off-by: Patrick Roy <roypat@...zon.co.uk>
---
 .../selftests/kvm/x86/private_mem_conversions_test.c       | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/kvm/x86/private_mem_conversions_test.c b/tools/testing/selftests/kvm/x86/private_mem_conversions_test.c
index 82a8d88b5338..dfc78781e93b 100644
--- a/tools/testing/selftests/kvm/x86/private_mem_conversions_test.c
+++ b/tools/testing/selftests/kvm/x86/private_mem_conversions_test.c
@@ -367,7 +367,7 @@ static void *__test_mem_conversions(void *__vcpu)
 }
 
 static void test_mem_conversions(enum vm_mem_backing_src_type src_type, uint32_t nr_vcpus,
-				 uint32_t nr_memslots)
+				 uint32_t nr_memslots, uint64_t gmem_flags)
 {
 	/*
 	 * Allocate enough memory so that each vCPU's chunk of memory can be
@@ -394,7 +394,7 @@ static void test_mem_conversions(enum vm_mem_backing_src_type src_type, uint32_t
 
 	vm_enable_cap(vm, KVM_CAP_EXIT_HYPERCALL, (1 << KVM_HC_MAP_GPA_RANGE));
 
-	memfd = vm_create_guest_memfd(vm, memfd_size, 0);
+	memfd = vm_create_guest_memfd(vm, memfd_size, gmem_flags);
 
 	for (i = 0; i < nr_memslots; i++)
 		vm_mem_add(vm, src_type, BASE_DATA_GPA + slot_size * i,
@@ -477,7 +477,8 @@ int main(int argc, char *argv[])
 		}
 	}
 
-	test_mem_conversions(src_type, nr_vcpus, nr_memslots);
+	test_mem_conversions(src_type, nr_vcpus, nr_memslots, 0);
+	test_mem_conversions(src_type, nr_vcpus, nr_memslots, KVM_GMEM_NO_DIRECT_MAP);
 
 	return 0;
 }
-- 
2.48.1