From: Lai Jiangshan <jiangshanlai@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Lai Jiangshan <jiangshan.ljs@antgroup.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
kvm@vger.kernel.org
Subject: [PATCH V3 03/14] kvm: x86/mmu: Check mmu->sync_page pointer in kvm_sync_page_check()
Date: Thu, 16 Feb 2023 23:41:09 +0800 [thread overview]
Message-ID: <20230216154115.710033-4-jiangshanlai@gmail.com> (raw)
In-Reply-To: <20230216154115.710033-1-jiangshanlai@gmail.com>
From: Lai Jiangshan <jiangshan.ljs@antgroup.com>
Check the pointer before calling it to catch any possible mistake.
Signed-off-by: Lai Jiangshan <jiangshan.ljs@antgroup.com>
---
arch/x86/kvm/mmu/mmu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index ee2837ea18d4..69ab0d1bb0ec 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -1940,7 +1940,7 @@ static bool kvm_sync_page_check(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
* differs then the memslot lookup (SMM vs. non-SMM) will be bogus, the
* reserved bits checks will be wrong, etc...
*/
- if (WARN_ON_ONCE(sp->role.direct ||
+ if (WARN_ON_ONCE(sp->role.direct || !vcpu->arch.mmu->sync_page ||
(sp->role.word ^ root_role.word) & ~sync_role_ign.word))
return false;
--
2.19.1.6.gb485710b
next prev parent reply other threads:[~2023-02-16 15:40 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-16 15:41 [PATCH V3 00/14] kvm: x86/mmu: Share the same code to invalidate each vTLB entry Lai Jiangshan
2023-02-16 15:41 ` [PATCH V3 01/14] KVM: x86/mmu: Use 64-bit address to invalidate to fix a subtle bug Lai Jiangshan
2023-02-16 15:41 ` [PATCH V3 02/14] kvm: x86/mmu: Move the check in FNAME(sync_page) as kvm_sync_page_check() Lai Jiangshan
2023-02-16 15:41 ` Lai Jiangshan [this message]
2023-02-16 15:41 ` [PATCH V3 04/14] kvm: x86/mmu: Set mmu->sync_page as NULL for direct paging Lai Jiangshan
2023-02-16 15:41 ` [PATCH V3 05/14] kvm: x86/mmu: Move the code out of FNAME(sync_page)'s loop body into mmu.c Lai Jiangshan
2023-02-16 15:41 ` [PATCH V3 06/14] kvm: x86/mmu: Reduce the update to the spte in FNAME(sync_spte) Lai Jiangshan
2023-02-16 15:41 ` [PATCH V3 07/14] KVM: x86/mmu: Sanity check input to kvm_mmu_free_roots() Lai Jiangshan
2023-02-16 15:41 ` [PATCH V3 08/14] kvm: x86/mmu: Use KVM_MMU_ROOT_XXX for kvm_mmu_invalidate_addr() Lai Jiangshan
2023-02-16 15:41 ` [PATCH V3 09/14] kvm: x86/mmu: Use kvm_mmu_invalidate_addr() in kvm_mmu_invpcid_gva() Lai Jiangshan
2023-02-16 23:53 ` [PATCH V3 10/14] kvm: x86/mmu: Use kvm_mmu_invalidate_addr() in nested_ept_invalidate_addr() Lai Jiangshan
2023-02-16 23:53 ` [PATCH V3 11/14] kvm: x86/mmu: Allow the roots to be invalid in FNAME(invlpg) Lai Jiangshan
2023-02-16 23:53 ` [PATCH V3 12/14] kvm: x86/mmu: Remove FNAME(invlpg) and use FNAME(sync_spte) to update vTLB instead Lai Jiangshan
2023-02-16 23:53 ` [PATCH V3 13/14] kvm: x86/mmu: Remove @no_dirty_log from FNAME(prefetch_gpte) Lai Jiangshan
2023-02-16 23:53 ` [PATCH V3 14/14] kvm: x86/mmu: Skip calling mmu->sync_spte() when the spte is 0 Lai Jiangshan
2023-03-23 22:50 ` [PATCH V3 00/14] kvm: x86/mmu: Share the same code to invalidate each vTLB entry Sean Christopherson
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