Commit 04bb92e4 authored Sep 16, 2015 by Wanpeng Li Committed by Paolo Bonzini Sep 16, 2015

KVM: vmx: fix VPID is 0000H in non-root operation



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 again reserving 0000H for VMX root operation.

Cc: stable@vger.kernel.org # 3.19+
Fixes: 34a1cd60
Reported-by: Wincy Van <fanwenyi0529@gmail.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent 62bea5bf

arch/x86/kvm/vmx.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -6064,6 +6064,8 @@ 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);

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