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Bug fixes for system management mode emulation. The first two patches

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fix SMM emulation on Nehalem processors.  The others fix some cases
 that became apparent as work progressed on the firmware side.
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull KVM fixes from Paolo Bonzini:
 "Bug fixes for system management mode emulation.

  The first two patches fix SMM emulation on Nehalem processors.  The
  others fix some cases that became apparent as work progressed on the
  firmware side"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: x86: fix RSM into 64-bit protected mode
  KVM: x86: fix previous commit for 32-bit
  KVM: x86: fix SMI to halted VCPU
  KVM: x86: clean up kvm_arch_vcpu_runnable
  KVM: x86: map/unmap private slots in __x86_set_memory_region
  KVM: x86: build kvm_userspace_memory_region in x86_set_memory_region
This commit is contained in:
Linus Torvalds 2015-10-14 10:01:32 -07:00
commit cfed1e3de4
4 changed files with 90 additions and 87 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/x86/include/asm/kvm_host.h
View File

@ -1226,10 +1226,8 @@ void kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err);
int kvm_is_in_guest(void);
int __x86_set_memory_region(struct kvm *kvm,
const struct kvm_userspace_memory_region *mem);
int x86_set_memory_region(struct kvm *kvm,
const struct kvm_userspace_memory_region *mem);
int __x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, u32 size);
int x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, u32 size);
bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu);
bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu);

10
arch/x86/kvm/emulate.c
View File

@ -2418,7 +2418,7 @@ static int rsm_load_state_64(struct x86_emulate_ctxt *ctxt, u64 smbase)
u64 val, cr0, cr4;
u32 base3;
u16 selector;
int i;
int i, r;
for (i = 0; i < 16; i++)
*reg_write(ctxt, i) = GET_SMSTATE(u64, smbase, 0x7ff8 - i * 8);
@ -2460,13 +2460,17 @@ static int rsm_load_state_64(struct x86_emulate_ctxt *ctxt, u64 smbase)
dt.address = GET_SMSTATE(u64, smbase, 0x7e68);
ctxt->ops->set_gdt(ctxt, &dt);
r = rsm_enter_protected_mode(ctxt, cr0, cr4);
if (r != X86EMUL_CONTINUE)
return r;
for (i = 0; i < 6; i++) {
int r = rsm_load_seg_64(ctxt, smbase, i);
r = rsm_load_seg_64(ctxt, smbase, i);
if (r != X86EMUL_CONTINUE)
return r;
}
return rsm_enter_protected_mode(ctxt, cr0, cr4);
return X86EMUL_CONTINUE;
}
static int em_rsm(struct x86_emulate_ctxt *ctxt)

26
arch/x86/kvm/vmx.c
View File

@ -4105,17 +4105,13 @@ static void seg_setup(int seg)
static int alloc_apic_access_page(struct kvm *kvm)
{
struct page *page;
struct kvm_userspace_memory_region kvm_userspace_mem;
int r = 0;
mutex_lock(&kvm->slots_lock);
if (kvm->arch.apic_access_page_done)
goto out;
kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
kvm_userspace_mem.flags = 0;
kvm_userspace_mem.guest_phys_addr = APIC_DEFAULT_PHYS_BASE;
kvm_userspace_mem.memory_size = PAGE_SIZE;
r = __x86_set_memory_region(kvm, &kvm_userspace_mem);
r = __x86_set_memory_region(kvm, APIC_ACCESS_PAGE_PRIVATE_MEMSLOT,
APIC_DEFAULT_PHYS_BASE, PAGE_SIZE);
if (r)
goto out;
@ -4140,17 +4136,12 @@ static int alloc_identity_pagetable(struct kvm *kvm)
{
/* Called with kvm->slots_lock held. */
struct kvm_userspace_memory_region kvm_userspace_mem;
int r = 0;
BUG_ON(kvm->arch.ept_identity_pagetable_done);
kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
kvm_userspace_mem.flags = 0;
kvm_userspace_mem.guest_phys_addr =
kvm->arch.ept_identity_map_addr;
kvm_userspace_mem.memory_size = PAGE_SIZE;
r = __x86_set_memory_region(kvm, &kvm_userspace_mem);
r = __x86_set_memory_region(kvm, IDENTITY_PAGETABLE_PRIVATE_MEMSLOT,
kvm->arch.ept_identity_map_addr, PAGE_SIZE);
return r;
}
@ -4949,14 +4940,9 @@ static int vmx_interrupt_allowed(struct kvm_vcpu *vcpu)
static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
{
int ret;
struct kvm_userspace_memory_region tss_mem = {
.slot = TSS_PRIVATE_MEMSLOT,
.guest_phys_addr = addr,
.memory_size = PAGE_SIZE * 3,
.flags = 0,
};
ret = x86_set_memory_region(kvm, &tss_mem);
ret = x86_set_memory_region(kvm, TSS_PRIVATE_MEMSLOT, addr,
PAGE_SIZE * 3);
if (ret)
return ret;
kvm->arch.tss_addr = addr;

135
arch/x86/kvm/x86.c
View File

@ -6453,6 +6453,12 @@ static inline int vcpu_block(struct kvm *kvm, struct kvm_vcpu *vcpu)
return 1;
}
static inline bool kvm_vcpu_running(struct kvm_vcpu *vcpu)
{
return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
!vcpu->arch.apf.halted);
}
static int vcpu_run(struct kvm_vcpu *vcpu)
{
int r;
@ -6461,8 +6467,7 @@ static int vcpu_run(struct kvm_vcpu *vcpu)
vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
for (;;) {
if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
!vcpu->arch.apf.halted)
if (kvm_vcpu_running(vcpu))
r = vcpu_enter_guest(vcpu);
else
r = vcpu_block(kvm, vcpu);
@ -7474,34 +7479,66 @@ void kvm_arch_sync_events(struct kvm *kvm)
kvm_free_pit(kvm);
}
int __x86_set_memory_region(struct kvm *kvm,
const struct kvm_userspace_memory_region *mem)
int __x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, u32 size)
{
int i, r;
unsigned long hva;
struct kvm_memslots *slots = kvm_memslots(kvm);
struct kvm_memory_slot *slot, old;
/* Called with kvm->slots_lock held. */
BUG_ON(mem->slot >= KVM_MEM_SLOTS_NUM);
if (WARN_ON(id >= KVM_MEM_SLOTS_NUM))
return -EINVAL;
slot = id_to_memslot(slots, id);
if (size) {
if (WARN_ON(slot->npages))
return -EEXIST;
/*
* MAP_SHARED to prevent internal slot pages from being moved
* by fork()/COW.
*/
hva = vm_mmap(NULL, 0, size, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, 0);
if (IS_ERR((void *)hva))
return PTR_ERR((void *)hva);
} else {
if (!slot->npages)
return 0;
hva = 0;
}
old = *slot;
for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
struct kvm_userspace_memory_region m = *mem;
struct kvm_userspace_memory_region m;
m.slot |= i << 16;
m.slot = id | (i << 16);
m.flags = 0;
m.guest_phys_addr = gpa;
m.userspace_addr = hva;
m.memory_size = size;
r = __kvm_set_memory_region(kvm, &m);
if (r < 0)
return r;
}
if (!size) {
r = vm_munmap(old.userspace_addr, old.npages * PAGE_SIZE);
WARN_ON(r < 0);
}
return 0;
}
EXPORT_SYMBOL_GPL(__x86_set_memory_region);
int x86_set_memory_region(struct kvm *kvm,
const struct kvm_userspace_memory_region *mem)
int x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, u32 size)
{
int r;
mutex_lock(&kvm->slots_lock);
r = __x86_set_memory_region(kvm, mem);
r = __x86_set_memory_region(kvm, id, gpa, size);
mutex_unlock(&kvm->slots_lock);
return r;
@ -7516,16 +7553,9 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
* unless the the memory map has changed due to process exit
* or fd copying.
*/
struct kvm_userspace_memory_region mem;
memset(&mem, 0, sizeof(mem));
mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
x86_set_memory_region(kvm, &mem);
mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
x86_set_memory_region(kvm, &mem);
mem.slot = TSS_PRIVATE_MEMSLOT;
x86_set_memory_region(kvm, &mem);
x86_set_memory_region(kvm, APIC_ACCESS_PAGE_PRIVATE_MEMSLOT, 0, 0);
x86_set_memory_region(kvm, IDENTITY_PAGETABLE_PRIVATE_MEMSLOT, 0, 0);
x86_set_memory_region(kvm, TSS_PRIVATE_MEMSLOT, 0, 0);
}
kvm_iommu_unmap_guest(kvm);
kfree(kvm->arch.vpic);
@ -7628,27 +7658,6 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
const struct kvm_userspace_memory_region *mem,
enum kvm_mr_change change)
{
/*
* Only private memory slots need to be mapped here since
* KVM_SET_MEMORY_REGION ioctl is no longer supported.
*/
if ((memslot->id >= KVM_USER_MEM_SLOTS) && (change == KVM_MR_CREATE)) {
unsigned long userspace_addr;
/*
* MAP_SHARED to prevent internal slot pages from being moved
* by fork()/COW.
*/
userspace_addr = vm_mmap(NULL, 0, memslot->npages * PAGE_SIZE,
PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, 0);
if (IS_ERR((void *)userspace_addr))
return PTR_ERR((void *)userspace_addr);
memslot->userspace_addr = userspace_addr;
}
return 0;
}
@ -7710,17 +7719,6 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
{
int nr_mmu_pages = 0;
if (change == KVM_MR_DELETE && old->id >= KVM_USER_MEM_SLOTS) {
int ret;
ret = vm_munmap(old->userspace_addr,
old->npages * PAGE_SIZE);
if (ret < 0)
printk(KERN_WARNING
"kvm_vm_ioctl_set_memory_region: "
"failed to munmap memory\n");
}
if (!kvm->arch.n_requested_mmu_pages)
nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
@ -7769,19 +7767,36 @@ void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
kvm_mmu_invalidate_zap_all_pages(kvm);
}
static inline bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu)
{
if (!list_empty_careful(&vcpu->async_pf.done))
return true;
if (kvm_apic_has_events(vcpu))
return true;
if (vcpu->arch.pv.pv_unhalted)
return true;
if (atomic_read(&vcpu->arch.nmi_queued))
return true;
if (test_bit(KVM_REQ_SMI, &vcpu->requests))
return true;
if (kvm_arch_interrupt_allowed(vcpu) &&
kvm_cpu_has_interrupt(vcpu))
return true;
return false;
}
int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events)
kvm_x86_ops->check_nested_events(vcpu, false);
return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
!vcpu->arch.apf.halted)
|| !list_empty_careful(&vcpu->async_pf.done)
|| kvm_apic_has_events(vcpu)
|| vcpu->arch.pv.pv_unhalted
|| atomic_read(&vcpu->arch.nmi_queued) ||
(kvm_arch_interrupt_allowed(vcpu) &&
kvm_cpu_has_interrupt(vcpu));
return kvm_vcpu_running(vcpu) || kvm_vcpu_has_events(vcpu);
}
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)