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The important fixes are for two bugs introduced by the merge window.

Browse source 
On top of this, add a couple of WARN_ONs and stop spamming dmesg on
 pretty much every boot of a virtual machine.
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull KVM fixes from Paolo Bonzini:
 "The important fixes are for two bugs introduced by the merge window.

  On top of this, add a couple of WARN_ONs and stop spamming dmesg on
  pretty much every boot of a virtual machine"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  kvm: warn on more invariant breakage
  kvm: fix sorting of memslots with base_gfn == 0
  kvm: x86: drop severity of "generation wraparound" message
  kvm: x86: vmx: reorder some msr writing
This commit is contained in:
Linus Torvalds 2014-12-28 13:08:08 -08:00
commit 2ea1e35ab1
3 changed files with 65 additions and 51 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/x86/kvm/mmu.c
View file

@ -4448,7 +4448,7 @@ void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm)
* zap all shadow pages.
*/
if (unlikely(kvm_current_mmio_generation(kvm) == 0)) {
printk_ratelimited(KERN_INFO "kvm: zapping shadow pages for mmio generation wraparound\n");
printk_ratelimited(KERN_DEBUG "kvm: zapping shadow pages for mmio generation wraparound\n");
kvm_mmu_invalidate_zap_all_pages(kvm);
}
}

88
arch/x86/kvm/vmx.c
View file

@ -5840,53 +5840,10 @@ static __init int hardware_setup(void)
memset(vmx_msr_bitmap_legacy, 0xff, PAGE_SIZE);
memset(vmx_msr_bitmap_longmode, 0xff, PAGE_SIZE);
vmx_disable_intercept_for_msr(MSR_FS_BASE, false);
vmx_disable_intercept_for_msr(MSR_GS_BASE, false);
vmx_disable_intercept_for_msr(MSR_KERNEL_GS_BASE, true);
vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_CS, false);
vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_ESP, false);
vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false);
vmx_disable_intercept_for_msr(MSR_IA32_BNDCFGS, true);
memcpy(vmx_msr_bitmap_legacy_x2apic,
vmx_msr_bitmap_legacy, PAGE_SIZE);
memcpy(vmx_msr_bitmap_longmode_x2apic,
vmx_msr_bitmap_longmode, PAGE_SIZE);
if (enable_apicv) {
for (msr = 0x800; msr <= 0x8ff; msr++)
vmx_disable_intercept_msr_read_x2apic(msr);
/* According SDM, in x2apic mode, the whole id reg is used.
* But in KVM, it only use the highest eight bits. Need to
* intercept it */
vmx_enable_intercept_msr_read_x2apic(0x802);
/* TMCCT */
vmx_enable_intercept_msr_read_x2apic(0x839);
/* TPR */
vmx_disable_intercept_msr_write_x2apic(0x808);
/* EOI */
vmx_disable_intercept_msr_write_x2apic(0x80b);
/* SELF-IPI */
vmx_disable_intercept_msr_write_x2apic(0x83f);
}
if (enable_ept) {
kvm_mmu_set_mask_ptes(0ull,
(enable_ept_ad_bits) ? VMX_EPT_ACCESS_BIT : 0ull,
(enable_ept_ad_bits) ? VMX_EPT_DIRTY_BIT : 0ull,
0ull, VMX_EPT_EXECUTABLE_MASK);
ept_set_mmio_spte_mask();
kvm_enable_tdp();
} else
kvm_disable_tdp();
update_ple_window_actual_max();
if (setup_vmcs_config(&vmcs_config) < 0) {
r = -EIO;
goto out7;
}
}
if (boot_cpu_has(X86_FEATURE_NX))
kvm_enable_efer_bits(EFER_NX);
@ -5945,6 +5902,49 @@ static __init int hardware_setup(void)
if (nested)
nested_vmx_setup_ctls_msrs();
vmx_disable_intercept_for_msr(MSR_FS_BASE, false);
vmx_disable_intercept_for_msr(MSR_GS_BASE, false);
vmx_disable_intercept_for_msr(MSR_KERNEL_GS_BASE, true);
vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_CS, false);
vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_ESP, false);
vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false);
vmx_disable_intercept_for_msr(MSR_IA32_BNDCFGS, true);
memcpy(vmx_msr_bitmap_legacy_x2apic,
vmx_msr_bitmap_legacy, PAGE_SIZE);
memcpy(vmx_msr_bitmap_longmode_x2apic,
vmx_msr_bitmap_longmode, PAGE_SIZE);
if (enable_apicv) {
for (msr = 0x800; msr <= 0x8ff; msr++)
vmx_disable_intercept_msr_read_x2apic(msr);
/* According SDM, in x2apic mode, the whole id reg is used.
* But in KVM, it only use the highest eight bits. Need to
* intercept it */
vmx_enable_intercept_msr_read_x2apic(0x802);
/* TMCCT */
vmx_enable_intercept_msr_read_x2apic(0x839);
/* TPR */
vmx_disable_intercept_msr_write_x2apic(0x808);
/* EOI */
vmx_disable_intercept_msr_write_x2apic(0x80b);
/* SELF-IPI */
vmx_disable_intercept_msr_write_x2apic(0x83f);
}
if (enable_ept) {
kvm_mmu_set_mask_ptes(0ull,
(enable_ept_ad_bits) ? VMX_EPT_ACCESS_BIT : 0ull,
(enable_ept_ad_bits) ? VMX_EPT_DIRTY_BIT : 0ull,
0ull, VMX_EPT_EXECUTABLE_MASK);
ept_set_mmio_spte_mask();
kvm_enable_tdp();
} else
kvm_disable_tdp();
update_ple_window_actual_max();
return alloc_kvm_area();
out7:

26
virt/kvm/kvm_main.c
View file

@ -671,6 +671,7 @@ static void update_memslots(struct kvm_memslots *slots,
WARN_ON(mslots[i].id != id);
if (!new->npages) {
WARN_ON(!mslots[i].npages);
new->base_gfn = 0;
if (mslots[i].npages)
slots->used_slots--;
@ -687,12 +688,25 @@ static void update_memslots(struct kvm_memslots *slots,
slots->id_to_index[mslots[i].id] = i;
i++;
}
while (i > 0 &&
new->base_gfn > mslots[i - 1].base_gfn) {
mslots[i] = mslots[i - 1];
slots->id_to_index[mslots[i].id] = i;
i--;
}
/*
* The ">=" is needed when creating a slot with base_gfn == 0,
* so that it moves before all those with base_gfn == npages == 0.
*
* On the other hand, if new->npages is zero, the above loop has
* already left i pointing to the beginning of the empty part of
* mslots, and the ">=" would move the hole backwards in this
* case---which is wrong. So skip the loop when deleting a slot.
*/
if (new->npages) {
while (i > 0 &&
new->base_gfn >= mslots[i - 1].base_gfn) {
mslots[i] = mslots[i - 1];
slots->id_to_index[mslots[i].id] = i;
i--;
}
} else
WARN_ON_ONCE(i != slots->used_slots);
mslots[i] = *new;
slots->id_to_index[mslots[i].id] = i;