linux-kernel - [PATCH 128/128] KVM: selftests: Drop DEFAULT_GUEST_PHY

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Date:   Wed,  4 May 2022 22:49:14 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Andrew Jones <drjones@...hat.com>,
        David Matlack <dmatlack@...gle.com>,
        Ben Gardon <bgardon@...gle.com>,
        Oliver Upton <oupton@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: [PATCH 128/128] KVM: selftests: Drop DEFAULT_GUEST_PHY_PAGES, open
 code the magic number

Remove DEFAULT_GUEST_PHY_PAGES and open code the magic number (with a
comment) in vm_nr_pages_required().  Exposing DEFAULT_GUEST_PHY_PAGES to
tests was a symptom of the VM creation APIs not cleanly supporting tests
that create runnable vCPUs, but can't do so immediately.  Now that tests
don't have to manually compute the amount of memory needed for basic
operation, make it harder for tests to do things that should be handled
by the framework, i.e. force developers to improve the framework instead
of hacking around flaws in individual tests.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 tools/testing/selftests/kvm/include/kvm_util_base.h | 1 -
 tools/testing/selftests/kvm/lib/kvm_util.c          | 8 +++++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
index 527f63a30668..d30f8e0612af 100644
--- a/tools/testing/selftests/kvm/include/kvm_util_base.h
+++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
@@ -100,7 +100,6 @@ memslot2region(struct kvm_vm *vm, uint32_t memslot);
 #define KVM_UTIL_MIN_VADDR		0x2000
 #define KVM_GUEST_PAGE_TABLE_MIN_PADDR	0x180000
 
-#define DEFAULT_GUEST_PHY_PAGES		512
 #define DEFAULT_GUEST_STACK_VADDR_MIN	0xab6000
 #define DEFAULT_STACK_PGS		5
 
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index f4bd4d7559b9..a0c8333d1bf6 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -274,7 +274,13 @@ static uint64_t vm_nr_pages_required(uint32_t nr_runnable_vcpus,
 		    "nr_vcpus = %d too large for host, max-vcpus = %d",
 		    nr_runnable_vcpus, kvm_check_cap(KVM_CAP_MAX_VCPUS));
 
-	nr_pages = DEFAULT_GUEST_PHY_PAGES;
+	/*
+	 * Arbitrarily allocate 512 pages (2mb when page size is 4kb) for the
+	 * test code and other per-VM assets that will be loaded into memslot0.
+	 */
+	nr_pages = 512;
+
+	/* Account for the per-vCPU stacks on behalf of the test. */
 	nr_pages += nr_runnable_vcpus * DEFAULT_STACK_PGS;
 
 	/*
-- 
2.36.0.464.gb9c8b46e94-goog