We need to hide SMRAM from guests not running in SMM. Therefore, all uses
of kvm_read_guest* and kvm_write_guest* must be changed to use different
address spaces depending on whether the VCPU is in system management mode.
We need to introduce a new family of functions for this.
For now, the functions are the same as the existing per-VM ones, except
for the type of the first argument, but later they will be changed to
use one of many "struct kvm_memslots" stored in struct kvm.
Whenever possible, slot-based functions are introduced, with two wrappers
for generic and vcpu-based actions. kvm_read_guest and kvm_write_guest
are copied into kvm_vcpu_read_guest and kvm_vcpu_write_guest.
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
include/linux/kvm_host.h | 19 +++++++
virt/kvm/kvm_main.c | 129 ++++++++++++++++++++++++++++++++++++++++++-----
2 files changed, 135 insertions(+), 13 deletions(-)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index f35fd89c7919..427a1034a70e 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -471,6 +471,11 @@ static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)
|| lockdep_is_held(&kvm->slots_lock));
}
+static inline struct kvm_memslots *kvm_vcpu_memslots(struct kvm_vcpu *vcpu)
+{
+ return kvm_memslots(vcpu->kvm);
+}
+
static inline struct kvm_memory_slot *
id_to_memslot(struct kvm_memslots *slots, int id)
{
@@ -577,6 +582,20 @@ unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn);
void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn);
+struct kvm_memslots *kvm_vcpu_memslots(struct kvm_vcpu *vcpu);
+struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn);
+unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn);
+int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, int offset,
+ int len);
+int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, void *data,
+ unsigned long len);
+int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data,
+ unsigned long len);
+int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, const void *data,
+ int offset, int len);
+int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
+ unsigned long len);
+
void kvm_vcpu_block(struct kvm_vcpu *vcpu);
void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
int kvm_vcpu_yield_to(struct kvm_vcpu *target);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 2818fca43732..2cbda443880b 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1100,6 +1100,11 @@ struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
}
EXPORT_SYMBOL_GPL(gfn_to_memslot);
+struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn)
+{
+ return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn);
+}
+
int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
{
struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
@@ -1175,6 +1180,12 @@ unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
}
EXPORT_SYMBOL_GPL(gfn_to_hva);
+unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn)
+{
+ return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL);
+}
+EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva);
+
/*
* If writable is set to false, the hva returned by this function is only
* allowed to be read.
@@ -1529,13 +1540,13 @@ static int next_segment(unsigned long len, int offset)
return len;
}
-int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
- int len)
+static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn,
+ void *data, int offset, int len)
{
int r;
unsigned long addr;
- addr = gfn_to_hva_prot(kvm, gfn, NULL);
+ addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
if (kvm_is_error_hva(addr))
return -EFAULT;
r = __copy_from_user(data, (void __user *)addr + offset, len);
@@ -1543,8 +1554,25 @@ int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
return -EFAULT;
return 0;
}
+
+int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
+ int len)
+{
+ struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
+
+ return __kvm_read_guest_page(slot, gfn, data, offset, len);
+}
EXPORT_SYMBOL_GPL(kvm_read_guest_page);
+int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data,
+ int offset, int len)
+{
+ struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
+
+ return __kvm_read_guest_page(slot, gfn, data, offset, len);
+}
+EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page);
+
int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
{
gfn_t gfn = gpa >> PAGE_SHIFT;
@@ -1565,15 +1593,33 @@ int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
}
EXPORT_SYMBOL_GPL(kvm_read_guest);
-int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
- unsigned long len)
+int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len)
{
- int r;
- unsigned long addr;
gfn_t gfn = gpa >> PAGE_SHIFT;
+ int seg;
int offset = offset_in_page(gpa);
+ int ret;
- addr = gfn_to_hva_prot(kvm, gfn, NULL);
+ while ((seg = next_segment(len, offset)) != 0) {
+ ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg);
+ if (ret < 0)
+ return ret;
+ offset = 0;
+ len -= seg;
+ data += seg;
+ ++gfn;
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest);
+
+static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
+ void *data, int offset, unsigned long len)
+{
+ int r;
+ unsigned long addr;
+
+ addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
if (kvm_is_error_hva(addr))
return -EFAULT;
pagefault_disable();
@@ -1583,16 +1629,35 @@ int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
return -EFAULT;
return 0;
}
-EXPORT_SYMBOL(kvm_read_guest_atomic);
-int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
- int offset, int len)
+int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
+ unsigned long len)
+{
+ gfn_t gfn = gpa >> PAGE_SHIFT;
+ struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
+ int offset = offset_in_page(gpa);
+
+ return __kvm_read_guest_atomic(slot, gpa, data, offset, len);
+}
+EXPORT_SYMBOL_GPL(kvm_read_guest_atomic);
+
+int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa,
+ void *data, unsigned long len)
+{
+ gfn_t gfn = gpa >> PAGE_SHIFT;
+ struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
+ int offset = offset_in_page(gpa);
+
+ return __kvm_read_guest_atomic(slot, gpa, data, offset, len);
+}
+EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic);
+
+static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn,
+ const void *data, int offset, int len)
{
int r;
- struct kvm_memory_slot *memslot;
unsigned long addr;
- memslot = gfn_to_memslot(kvm, gfn);
addr = gfn_to_hva_memslot(memslot, gfn);
if (kvm_is_error_hva(addr))
return -EFAULT;
@@ -1602,8 +1667,25 @@ int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
mark_page_dirty_in_slot(memslot, gfn);
return 0;
}
+
+int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn,
+ const void *data, int offset, int len)
+{
+ struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
+
+ return __kvm_write_guest_page(slot, gfn, data, offset, len);
+}
EXPORT_SYMBOL_GPL(kvm_write_guest_page);
+int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
+ const void *data, int offset, int len)
+{
+ struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
+
+ return __kvm_write_guest_page(slot, gfn, data, offset, len);
+}
+EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page);
+
int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
unsigned long len)
{
@@ -1625,6 +1707,27 @@ int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
}
EXPORT_SYMBOL_GPL(kvm_write_guest);
+int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
+ unsigned long len)
+{
+ gfn_t gfn = gpa >> PAGE_SHIFT;
+ int seg;
+ int offset = offset_in_page(gpa);
+ int ret;
+
+ while ((seg = next_segment(len, offset)) != 0) {
+ ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg);
+ if (ret < 0)
+ return ret;
+ offset = 0;
+ len -= seg;
+ data += seg;
+ ++gfn;
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest);
+
int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
gpa_t gpa, unsigned long len)
{
--
1.8.3.1
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