linux-kernel - [PATCH 5/7] KVM: VMX: Refactor 32-bit PSE PT creation to avoid using MMU macro

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Date:   Wed, 23 Jun 2021 16:05:50 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Peter Gonda <pgonda@...gle.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: [PATCH 5/7] KVM: VMX: Refactor 32-bit PSE PT creation to avoid using
 MMU macro

Compute the number of PTEs to be filled for the 32-bit PSE page tables
using the page size and the size of each entry.  While using the MMU's
PT32_ENT_PER_PAGE macro is arguably better in isolation, removing VMX's
usage will allow a future namespacing cleanup to move the guest page
table macros into paging_tmpl.h, out of the reach of code that isn't
directly related to shadow paging.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/vmx/vmx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index ab6f682645d7..f6fa922ca6e3 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -3584,7 +3584,7 @@ static int init_rmode_identity_map(struct kvm *kvm)
 	}
 
 	/* Set up identity-mapping pagetable for EPT in real mode */
-	for (i = 0; i < PT32_ENT_PER_PAGE; i++) {
+	for (i = 0; i < (PAGE_SIZE / sizeof(tmp)); i++) {
 		tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |
 			_PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE);
 		if (__copy_to_user(uaddr + i * sizeof(tmp), &tmp, sizeof(tmp))) {
-- 
2.32.0.288.g62a8d224e6-goog