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kvm: vmx: Fix entry number check for add_atomic_switch_msr()

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commit 98ae70cc47 upstream.

Commit ca83b4a7f2 ("x86/KVM/VMX: Add find_msr() helper function")
introduces the helper function find_msr(), which returns -ENOENT when
not find the msr in vmx->msr_autoload.guest/host. Correct checking contion
of no more available entry in vmx->msr_autoload.

Fixes: ca83b4a7f2 ("x86/KVM/VMX: Add find_msr() helper function")
Cc: stable@vger.kernel.org
Signed-off-by: Xiaoyao Li <xiaoyao.li@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xiaoyao Li
2019-02-14 12:08:58 +08:00
committed by Greg Kroah-Hartman
parent c58f010beb
commit 0d41c03c41
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kvm/vmx.c
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@@ -2757,7 +2757,8 @@ static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr,
if (!entry_only)
j = find_msr(&m->host, msr);
if (i == NR_AUTOLOAD_MSRS || j == NR_AUTOLOAD_MSRS) {
if ((i < 0 && m->guest.nr == NR_AUTOLOAD_MSRS) ||
(j < 0 && m->host.nr == NR_AUTOLOAD_MSRS)) {
printk_once(KERN_WARNING "Not enough msr switch entries. "
"Can't add msr %x\n", msr);
return;