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Merge git://kvm.qumranet.com/home/avi/kvm

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* git://kvm.qumranet.com/home/avi/kvm:
  KVM: always reload segment selectors
  KVM: Prevent system selectors leaking into guest on real->protected mode transition on vmx
This commit is contained in:
Linus Torvalds 2007-03-27 09:22:05 -07:00
commit 5158074971
1 changed files with 22 additions and 17 deletions
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39
drivers/kvm/vmx.c
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@ -618,7 +618,7 @@ static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save)
{
struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
if (vmcs_readl(sf->base) == save->base) {
if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
vmcs_write16(sf->selector, save->selector);
vmcs_writel(sf->base, save->base);
vmcs_write32(sf->limit, save->limit);
@ -1888,6 +1888,27 @@ again:
[cr2]"i"(offsetof(struct kvm_vcpu, cr2))
: "cc", "memory" );
/*
* Reload segment selectors ASAP. (it's needed for a functional
* kernel: x86 relies on having __KERNEL_PDA in %fs and x86_64
* relies on having 0 in %gs for the CPU PDA to work.)
*/
if (fs_gs_ldt_reload_needed) {
load_ldt(ldt_sel);
load_fs(fs_sel);
/*
* If we have to reload gs, we must take care to
* preserve our gs base.
*/
local_irq_disable();
load_gs(gs_sel);
#ifdef CONFIG_X86_64
wrmsrl(MSR_GS_BASE, vmcs_readl(HOST_GS_BASE));
#endif
local_irq_enable();
reload_tss();
}
++kvm_stat.exits;
save_msrs(vcpu->guest_msrs, NR_BAD_MSRS);
@ -1905,22 +1926,6 @@ again:
kvm_run->exit_reason = vmcs_read32(VM_INSTRUCTION_ERROR);
r = 0;
} else {
if (fs_gs_ldt_reload_needed) {
load_ldt(ldt_sel);
load_fs(fs_sel);
/*
* If we have to reload gs, we must take care to
* preserve our gs base.
*/
local_irq_disable();
load_gs(gs_sel);
#ifdef CONFIG_X86_64
wrmsrl(MSR_GS_BASE, vmcs_readl(HOST_GS_BASE));
#endif
local_irq_enable();
reload_tss();
}
/*
* Profile KVM exit RIPs:
*/