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f077238941
Make sure vpid02 is always flushed on first use by setting last_vpid=0 when allocating vpid02. nested_vmx_transition_tlb_flush() will always detect a VPID change on first VM-Enter after VMXON, because VPID=0 in vmcs12 is not allowed if L1 enables VPID. This avoids using stale TLB entries from a previous lifetime of the VPID, that might have been associated with a different vCPU (or a completely different VM). Note that last_vpid is already being initialized as 0 when the vCPU is created, but it is not reset when vpid02 is freed on VMXOFF. Hence, the problem can only occur if L1 does VMXOFF -> VMXON, runs an L2, and KVM happens to reuse a VPID that has TLB entries on the physical CPU. Cc: stable@vger.kernel.org Signed-off-by: Yosry Ahmed <yosry@kernel.org> Reviewed-by: Kai Huang <kai.huang@intel.com> Reviewed-by: Jim Mattson <jmattson@google.com> Link: https://patch.msgid.link/20260616214652.2157032-2-yosry@kernel.org Signed-off-by: Sean Christopherson <seanjc@google.com> |
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