Messages in this thread Patch in this message | | | From | Lai Jiangshan <> | Subject | [PATCH 01/15] KVM: X86: Ensure the dirty PDPTEs to be loaded | Date | Mon, 8 Nov 2021 20:43:53 +0800 |
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From: Lai Jiangshan <laijs@linux.alibaba.com>
For VMX, the dirty PDPTEs needs to be loaded before the coming VMENTER via vmx_load_mmu_pgd() if EPT is enabled.
But not all paths that call load_pdptrs() will cause vmx_load_mmu_pgd() to be invoked. Normally, kvm_mmu_reset_context() and KVM_REQ_LOAD_MMU_PGD are used to launch later vmx_load_mmu_pgd().
The commit d81135a57aa6("KVM: x86: do not reset mmu if CR0.CD and CR0.NW are changed") skips kvm_mmu_reset_context() after load_pdptrs() when changing CR0.CD and CR0.NW.
The commit 21823fbda552("KVM: x86: Invalidate all PGDs for the current PCID on MOV CR3 w/ flush") skips KVM_REQ_LOAD_MMU_PGD after load_pdptrs() when rewriting the CR3 with the same value.
The commit a91a7c709600("KVM: X86: Don't reset mmu context when toggling X86_CR4_PGE") skips kvm_mmu_reset_context() after load_pdptrs() when changing CR4.PGE.
Fixes: d81135a57aa6("KVM: x86: do not reset mmu if CR0.CD and CR0.NW are changed") Fixes: 21823fbda552("KVM: x86: Invalidate all PGDs for the current PCID on MOV CR3 w/ flush") Fixes: a91a7c709600("KVM: X86: Don't reset mmu context when toggling X86_CR4_PGE") Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com> --- arch/x86/kvm/x86.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index ac83d873d65b..034c233ea5a1 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -830,6 +830,8 @@ int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3) memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs)); kvm_register_mark_dirty(vcpu, VCPU_EXREG_PDPTR); + /* Ensure the dirty PDPTEs to be loaded. */ + kvm_make_request(KVM_REQ_LOAD_MMU_PGD, vcpu); vcpu->arch.pdptrs_from_userspace = false; return 1; -- 2.19.1.6.gb485710b
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