openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

KVM: VMX: fix DPL during entry to protected mode 

On CPUs without support for unrestricted guests DPL cannot be smaller
than RPL for data segments during guest entry, but this state can occurs
if a data segment selector changes while vcpu is in real mode to a value
with lowest two bits != 00. Fix that by forcing DPL == RPL on transition
to protected mode.

This is a regression introduced by c865c43de6.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Gleb Natapov 2012-12-11 15:14:10 +02:00 committed by Marcelo Tosatti
parent 0ca0d818cb
commit a4d3326c2d
1 changed files with 1 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/kvm/vmx.c
View File

@ -2766,6 +2766,7 @@ static void fix_pmode_dataseg(struct kvm_vcpu *vcpu, int seg, struct kvm_segment
if (!(vmcs_readl(sf->base) == tmp.base && tmp.s)) {
tmp.base = vmcs_readl(sf->base);
tmp.selector = vmcs_read16(sf->selector);
tmp.dpl = tmp.selector & SELECTOR_RPL_MASK;
tmp.s = 1;
}
vmx_set_segment(vcpu, &tmp, seg);