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Date: Sun, 18 Mar 2007 10:57:26 +0200
From: Avi Kivity <avi@...ranet.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: kvm-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: [GIT PULL][RESEND] KVM updates for Linux 2.6.21-rc4
Linus,
Please pull from the 'linus' branch of the git repository at
git://kvm.qumranet.com/home/avi/kvm.git
containing the following kvm stability and correctness fixes:
Avi Kivity (4):
KVM: Unset kvm_arch_ops if arch module loading failed
KVM: Fix guest sysenter on vmx
KVM: MMU: Fix guest writes to nonpae pde
KVM: MMU: Fix host memory corruption on i386 with >= 4GB ram
drivers/kvm/kvm_main.c | 4 ++-
drivers/kvm/mmu.c | 52 ++++++++++++++++++++++++++++++++++-------------
drivers/kvm/vmx.c | 8 +++---
3 files changed, 44 insertions(+), 20 deletions(-)
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index a163bca..dc7a8c7 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -2464,7 +2464,7 @@ int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
r = kvm_arch_ops->hardware_setup();
if (r < 0)
- return r;
+ goto out;
on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
r = register_cpu_notifier(&kvm_cpu_notifier);
@@ -2500,6 +2500,8 @@ out_free_2:
out_free_1:
on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
kvm_arch_ops->hardware_unsetup();
+out:
+ kvm_arch_ops = NULL;
return r;
}
diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index a1a9336..e85b4c7 100644
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -131,7 +131,7 @@ static int dbg = 1;
(((address) >> PT32_LEVEL_SHIFT(level)) & ((1 << PT32_LEVEL_BITS) - 1))
-#define PT64_BASE_ADDR_MASK (((1ULL << 52) - 1) & PAGE_MASK)
+#define PT64_BASE_ADDR_MASK (((1ULL << 52) - 1) & ~(u64)(PAGE_SIZE-1))
#define PT64_DIR_BASE_ADDR_MASK \
(PT64_BASE_ADDR_MASK & ~((1ULL << (PAGE_SHIFT + PT64_LEVEL_BITS)) - 1))
@@ -406,8 +406,8 @@ static void rmap_write_protect(struct kvm_vcpu *vcpu, u64 gfn)
spte = desc->shadow_ptes[0];
}
BUG_ON(!spte);
- BUG_ON((*spte & PT64_BASE_ADDR_MASK) !=
- page_to_pfn(page) << PAGE_SHIFT);
+ BUG_ON((*spte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT
+ != page_to_pfn(page));
BUG_ON(!(*spte & PT_PRESENT_MASK));
BUG_ON(!(*spte & PT_WRITABLE_MASK));
rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte);
@@ -1093,22 +1093,40 @@ out:
return r;
}
+static void mmu_pre_write_zap_pte(struct kvm_vcpu *vcpu,
+ struct kvm_mmu_page *page,
+ u64 *spte)
+{
+ u64 pte;
+ struct kvm_mmu_page *child;
+
+ pte = *spte;
+ if (is_present_pte(pte)) {
+ if (page->role.level == PT_PAGE_TABLE_LEVEL)
+ rmap_remove(vcpu, spte);
+ else {
+ child = page_header(pte & PT64_BASE_ADDR_MASK);
+ mmu_page_remove_parent_pte(vcpu, child, spte);
+ }
+ }
+ *spte = 0;
+}
+
void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes)
{
gfn_t gfn = gpa >> PAGE_SHIFT;
struct kvm_mmu_page *page;
- struct kvm_mmu_page *child;
struct hlist_node *node, *n;
struct hlist_head *bucket;
unsigned index;
u64 *spte;
- u64 pte;
unsigned offset = offset_in_page(gpa);
unsigned pte_size;
unsigned page_offset;
unsigned misaligned;
int level;
int flooded = 0;
+ int npte;
pgprintk("%s: gpa %llx bytes %d\n", __FUNCTION__, gpa, bytes);
if (gfn == vcpu->last_pt_write_gfn) {
@@ -1144,22 +1162,26 @@ void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes)
}
page_offset = offset;
level = page->role.level;
+ npte = 1;
if (page->role.glevels == PT32_ROOT_LEVEL) {
- page_offset <<= 1; /* 32->64 */
+ page_offset <<= 1; /* 32->64 */
+ /*
+ * A 32-bit pde maps 4MB while the shadow pdes map
+ * only 2MB. So we need to double the offset again
+ * and zap two pdes instead of one.
+ */
+ if (level == PT32_ROOT_LEVEL) {
+ page_offset <<= 1;
+ npte = 2;
+ }
page_offset &= ~PAGE_MASK;
}
spte = __va(page->page_hpa);
spte += page_offset / sizeof(*spte);
- pte = *spte;
- if (is_present_pte(pte)) {
- if (level == PT_PAGE_TABLE_LEVEL)
- rmap_remove(vcpu, spte);
- else {
- child = page_header(pte & PT64_BASE_ADDR_MASK);
- mmu_page_remove_parent_pte(vcpu, child, spte);
- }
+ while (npte--) {
+ mmu_pre_write_zap_pte(vcpu, page, spte);
+ ++spte;
}
- *spte = 0;
}
}
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index c07178e..bfa0ce4 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -371,10 +371,10 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
data = vmcs_read32(GUEST_SYSENTER_CS);
break;
case MSR_IA32_SYSENTER_EIP:
- data = vmcs_read32(GUEST_SYSENTER_EIP);
+ data = vmcs_readl(GUEST_SYSENTER_EIP);
break;
case MSR_IA32_SYSENTER_ESP:
- data = vmcs_read32(GUEST_SYSENTER_ESP);
+ data = vmcs_readl(GUEST_SYSENTER_ESP);
break;
default:
msr = find_msr_entry(vcpu, msr_index);
@@ -412,10 +412,10 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
vmcs_write32(GUEST_SYSENTER_CS, data);
break;
case MSR_IA32_SYSENTER_EIP:
- vmcs_write32(GUEST_SYSENTER_EIP, data);
+ vmcs_writel(GUEST_SYSENTER_EIP, data);
break;
case MSR_IA32_SYSENTER_ESP:
- vmcs_write32(GUEST_SYSENTER_ESP, data);
+ vmcs_writel(GUEST_SYSENTER_ESP, data);
break;
case MSR_IA32_TIME_STAMP_COUNTER:
guest_write_tsc(data);
-
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