diff options
author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-27 09:22:05 -0700 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-27 09:22:05 -0700 |
commit | 5158074971220eeaa0677942a4bad3b3439a9638 (patch) | |
tree | 63db9902e78162dca99c3530b3a022fec713089b /drivers | |
parent | 436ce71638eceb0f9dd7608157807c37b29c3db7 (diff) | |
parent | 6d9658df07789a124e5c1f8677afcd7773439f3e (diff) |
Merge git://kvm.qumranet.com/home/avi/kvm
* 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
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/kvm/vmx.c | 39 |
1 files changed, 22 insertions, 17 deletions
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c index bfa0ce42ea9..fbbf9d6b299 100644 --- a/drivers/kvm/vmx.c +++ b/drivers/kvm/vmx.c @@ -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: */ |