linux-kernel - [PATCH v2 23/42] KVM: selftests: Use vm->pa

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Date:   Tue, 14 Jun 2022 20:06:48 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sean Christopherson <seanjc@...gle.com>,
        Jim Mattson <jmattson@...gle.com>
Subject: [PATCH v2 23/42] KVM: selftests: Use vm->pa_bits to generate reserved
 PA bits

Use vm->pa_bits to generate the mask of physical address bits that are
reserved in page table entries.  vm->pa_bits is set when the VM is
created, i.e. it's guaranteed to be valid when populating page tables.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 tools/testing/selftests/kvm/lib/x86_64/processor.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
index 887272a33837..5fd6563f23d1 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -221,16 +221,12 @@ static uint64_t *_vm_get_page_table_entry(struct kvm_vm *vm,
 	uint16_t index[4];
 	uint64_t *pml4e, *pdpe, *pde;
 	uint64_t *pte;
-	struct kvm_cpuid_entry2 *entry;
 	struct kvm_sregs sregs;
-	int max_phy_addr;
 	uint64_t rsvd_mask = 0;
 
-	entry = kvm_get_supported_cpuid_index(0x80000008, 0);
-	max_phy_addr = entry->eax & 0x000000ff;
 	/* Set the high bits in the reserved mask. */
-	if (max_phy_addr < 52)
-		rsvd_mask = GENMASK_ULL(51, max_phy_addr);
+	if (vm->pa_bits < 52)
+		rsvd_mask = GENMASK_ULL(51, vm->pa_bits);
 
 	/*
 	 * SDM vol 3, fig 4-11 "Formats of CR3 and Paging-Structure Entries
-- 
2.36.1.476.g0c4daa206d-goog