Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=da4a00f002239f72b0d7d0eeaa3b60100e2b1438
Commit: da4a00f002239f72b0d7d0eeaa3b60100e2b1438
Parent: 815af8d42ee3f844c0ceaf2104bd9c6a0bb1e26c
Author: Avi Kivity <[EMAIL PROTECTED]>
AuthorDate: Fri Jan 5 16:36:44 2007 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Fri Jan 5 23:55:25 2007 -0800
[PATCH] KVM: MMU: Support emulated writes into RAM
As the mmu write protects guest page table, we emulate those writes. Since
they are not mmio, there is no need to go to userspace to perform them.
So, perform the writes in the kernel if possible, and notify the mmu about
them so it can take the approriate action.
Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>
Acked-by: Ingo Molnar <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
drivers/kvm/kvm.h | 3 +++
drivers/kvm/kvm_main.c | 24 ++++++++++++++++++++++++
drivers/kvm/mmu.c | 9 +++++++++
3 files changed, 36 insertions(+), 0 deletions(-)
diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 58b9deb..b7068ec 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -448,6 +448,9 @@ int kvm_write_guest(struct kvm_vcpu *vcpu,
unsigned long segment_base(u16 selector);
+void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
+void kvm_mmu_post_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
+
static inline struct page *_gfn_to_page(struct kvm *kvm, gfn_t gfn)
{
struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 68e121e..047f6f6 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -877,6 +877,27 @@ static int emulator_read_emulated(unsigned long addr,
}
}
+static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
+ unsigned long val, int bytes)
+{
+ struct kvm_memory_slot *m;
+ struct page *page;
+ void *virt;
+
+ if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
+ return 0;
+ m = gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT);
+ if (!m)
+ return 0;
+ page = gfn_to_page(m, gpa >> PAGE_SHIFT);
+ kvm_mmu_pre_write(vcpu, gpa, bytes);
+ virt = kmap_atomic(page, KM_USER0);
+ memcpy(virt + offset_in_page(gpa), &val, bytes);
+ kunmap_atomic(virt, KM_USER0);
+ kvm_mmu_post_write(vcpu, gpa, bytes);
+ return 1;
+}
+
static int emulator_write_emulated(unsigned long addr,
unsigned long val,
unsigned int bytes,
@@ -888,6 +909,9 @@ static int emulator_write_emulated(unsigned long addr,
if (gpa == UNMAPPED_GVA)
return X86EMUL_PROPAGATE_FAULT;
+ if (emulator_write_phys(vcpu, gpa, val, bytes))
+ return X86EMUL_CONTINUE;
+
vcpu->mmio_needed = 1;
vcpu->mmio_phys_addr = gpa;
vcpu->mmio_size = bytes;
diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index ceae25b..bce7eb2 100644
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -956,6 +956,15 @@ int kvm_mmu_reset_context(struct kvm_vcpu *vcpu)
return init_kvm_mmu(vcpu);
}
+void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes)
+{
+ pgprintk("%s: gpa %llx bytes %d\n", __FUNCTION__, gpa, bytes);
+}
+
+void kvm_mmu_post_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes)
+{
+}
+
static void free_mmu_pages(struct kvm_vcpu *vcpu)
{
while (!list_empty(&vcpu->free_pages)) {
-
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