Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7b53aa56508479507c6e5667bb252ca7c2cd19cf
Commit: 7b53aa56508479507c6e5667bb252ca7c2cd19cf
Parent: 313899477f7578d37e82ead1af10f794a6da3c90
Author: Avi Kivity <[EMAIL PROTECTED]>
AuthorDate: Tue Jun 5 12:17:03 2007 +0300
Committer: Avi Kivity <[EMAIL PROTECTED]>
CommitDate: Mon Jul 16 12:05:45 2007 +0300
KVM: Fix vcpu freeing for guest smp
A vcpu can pin up to four mmu shadow pages, which means the freeing
loop will never terminate. Fix by first unpinning shadow pages on
all vcpus, then freeing shadow pages.
Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>
---
drivers/kvm/kvm_main.c | 15 +++++++++++++++
drivers/kvm/mmu.c | 4 ++--
2 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 3c3231d..3ff8ee5 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -381,6 +381,16 @@ static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
}
}
+static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
+{
+ if (!vcpu->vmcs)
+ return;
+
+ vcpu_load(vcpu);
+ kvm_mmu_unload(vcpu);
+ vcpu_put(vcpu);
+}
+
static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
{
if (!vcpu->vmcs)
@@ -401,6 +411,11 @@ static void kvm_free_vcpus(struct kvm *kvm)
{
unsigned int i;
+ /*
+ * Unpin any mmu pages first.
+ */
+ for (i = 0; i < KVM_MAX_VCPUS; ++i)
+ kvm_unload_vcpu_mmu(&kvm->vcpus[i]);
for (i = 0; i < KVM_MAX_VCPUS; ++i)
kvm_free_vcpu(&kvm->vcpus[i]);
}
diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index 5915d7a..d4de988 100644
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -838,11 +838,12 @@ static void mmu_free_roots(struct kvm_vcpu *vcpu)
int i;
struct kvm_mmu_page *page;
+ if (!VALID_PAGE(vcpu->mmu.root_hpa))
+ return;
#ifdef CONFIG_X86_64
if (vcpu->mmu.shadow_root_level == PT64_ROOT_LEVEL) {
hpa_t root = vcpu->mmu.root_hpa;
- ASSERT(VALID_PAGE(root));
page = page_header(root);
--page->root_count;
vcpu->mmu.root_hpa = INVALID_PAGE;
@@ -853,7 +854,6 @@ static void mmu_free_roots(struct kvm_vcpu *vcpu)
hpa_t root = vcpu->mmu.pae_root[i];
if (root) {
- ASSERT(VALID_PAGE(root));
root &= PT64_BASE_ADDR_MASK;
page = page_header(root);
--page->root_count;
-
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