linux-kernel - [PATCH 1/3] Revert "selftests: kvm: make allocation of extra memory take effect"

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Date:   Wed,  9 Jun 2021 07:38:14 +0800
From:   Zhenzhong Duan <zhenzhong.duan@...el.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-kselftest@...r.kernel.org, kvm@...r.kernel.org,
        maciej.szmigiero@...cle.com, drjones@...hat.com,
        pbonzini@...hat.com, shuah@...nel.org,
        Zhenzhong Duan <zhenzhong.duan@...el.com>
Subject: [PATCH 1/3] Revert "selftests: kvm: make allocation of extra memory take effect"

This reverts commit 39fe2fc96694164723846fccf6caa42c3aee6ec4.

Parameter extra_mem_pages in vm_create_default() is used to calculate
the page table size for all the memory chunks.
Real memory allocation for non-slot0 memory happens by extra call of
vm_userspace_mem_region_add() outside of vm_create_default().

The reverted commit changed above meaning of extra_mem_pages as extra
slot0 memory size. This way made the page table size calculations
open coded in separate test.

Link: https://lkml.org/lkml/2021/6/3/551
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@...el.com>
---
 tools/testing/selftests/kvm/lib/kvm_util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 28e528c19d28..63418df921f0 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -320,7 +320,7 @@ struct kvm_vm *vm_create_with_vcpus(enum vm_guest_mode mode, uint32_t nr_vcpus,
 	 */
 	uint64_t vcpu_pages = (DEFAULT_STACK_PGS + num_percpu_pages) * nr_vcpus;
 	uint64_t extra_pg_pages = (extra_mem_pages + vcpu_pages) / PTES_PER_MIN_PAGE * 2;
-	uint64_t pages = DEFAULT_GUEST_PHY_PAGES + extra_mem_pages + vcpu_pages + extra_pg_pages;
+	uint64_t pages = DEFAULT_GUEST_PHY_PAGES + vcpu_pages + extra_pg_pages;
 	struct kvm_vm *vm;
 	int i;
 
-- 
2.25.1