Messages in this thread Patch in this message | | | From | Wanpeng Li <> | Subject | [PATCH] KVM: vmx: fix VPID is 0000H in non-root operation | Date | Wed, 16 Sep 2015 19:31:11 +0800 |
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Reference SDM 28.1:
The current VPID is 0000H in the following situations: — Outside VMX operation. (This includes operation in system-management mode under the default treatment of SMIs and SMM with VMX operation; see Section 34.14.) — In VMX root operation. — In VMX non-root operation when the “enable VPID” VM-execution control is 0.
The VPID should never be 0000H in non-root operation when "enable VPID" VM-execution control is 1. However, commit (34a1cd60: 'kvm: x86: vmx: move some vmx setting from vmx_init() to hardware_setup()') remove the codes which reserve 0000H for VMX root operation.
This patch fix it by reintroducing reserve 0000H for VMX root operation.
Reported-by: Wincy Van <fanwenyi0529@gmail.com> Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com> --- arch/x86/kvm/vmx.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 9ff6a3f..a63b9ca 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -6056,6 +6056,8 @@ static __init int hardware_setup(void) memcpy(vmx_msr_bitmap_longmode_x2apic, vmx_msr_bitmap_longmode, PAGE_SIZE); + set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */ + if (enable_apicv) { for (msr = 0x800; msr <= 0x8ff; msr++) vmx_disable_intercept_msr_read_x2apic(msr); -- 1.9.1
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