linux-kernel - [PATCH RFC v7 01/64] KVM: Fix memslot boundary condition for large page

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Date:   Wed, 14 Dec 2022 13:39:53 -0600
From:   Michael Roth <michael.roth@....com>
To:     <kvm@...r.kernel.org>
CC:     <linux-coco@...ts.linux.dev>, <linux-mm@...ck.org>,
        <linux-crypto@...r.kernel.org>, <x86@...nel.org>,
        <linux-kernel@...r.kernel.org>, <tglx@...utronix.de>,
        <mingo@...hat.com>, <jroedel@...e.de>, <thomas.lendacky@....com>,
        <hpa@...or.com>, <ardb@...nel.org>, <pbonzini@...hat.com>,
        <seanjc@...gle.com>, <vkuznets@...hat.com>,
        <wanpengli@...cent.com>, <jmattson@...gle.com>, <luto@...nel.org>,
        <dave.hansen@...ux.intel.com>, <slp@...hat.com>,
        <pgonda@...gle.com>, <peterz@...radead.org>,
        <srinivas.pandruvada@...ux.intel.com>, <rientjes@...gle.com>,
        <dovmurik@...ux.ibm.com>, <tobin@....com>, <bp@...en8.de>,
        <vbabka@...e.cz>, <kirill@...temov.name>, <ak@...ux.intel.com>,
        <tony.luck@...el.com>, <marcorr@...gle.com>,
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        <alpergun@...gle.com>, <dgilbert@...hat.com>, <jarkko@...nel.org>,
        <ashish.kalra@....com>, <harald@...fian.com>,
        Nikunj A Dadhania <nikunj@....com>
Subject: [PATCH RFC v7 01/64] KVM: Fix memslot boundary condition for large page

From: Nikunj A Dadhania <nikunj@....com>

Aligned end boundary causes a kvm crash, handle the case.

Signed-off-by: Nikunj A Dadhania <nikunj@....com>
Signed-off-by: Michael Roth <michael.roth@....com>
---
 arch/x86/kvm/mmu/mmu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index b1953ebc012e..b3ffc61c668c 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -7159,6 +7159,9 @@ static void kvm_update_lpage_private_shared_mixed(struct kvm *kvm,
 		for (gfn = first + pages; gfn < last; gfn += pages)
 			linfo_set_mixed(gfn, slot, level, false);
 
+		if (gfn == last)
+			goto out;
+
 		gfn = last;
 		gfn_end = min(last + pages, slot->base_gfn + slot->npages);
 		mixed = mem_attrs_mixed(kvm, slot, level, attrs, gfn, gfn_end);
-- 
2.25.1