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Diffstat (limited to 'arch/s390/kvm/gaccess.h')
-rw-r--r--arch/s390/kvm/gaccess.h243
1 files changed, 175 insertions, 68 deletions
diff --git a/arch/s390/kvm/gaccess.h b/arch/s390/kvm/gaccess.h
index 03c716a0f01f..c86f6ae43f76 100644
--- a/arch/s390/kvm/gaccess.h
+++ b/arch/s390/kvm/gaccess.h
@@ -1,5 +1,5 @@
/*
- * gaccess.h - access guest memory
+ * access.h - access guest memory
*
* Copyright IBM Corp. 2008,2009
*
@@ -22,20 +22,13 @@ static inline void __user *__guestaddr_to_user(struct kvm_vcpu *vcpu,
unsigned long guestaddr)
{
unsigned long prefix = vcpu->arch.sie_block->prefix;
- unsigned long origin = vcpu->arch.sie_block->gmsor;
- unsigned long memsize = kvm_s390_vcpu_get_memsize(vcpu);
if (guestaddr < 2 * PAGE_SIZE)
guestaddr += prefix;
else if ((guestaddr >= prefix) && (guestaddr < prefix + 2 * PAGE_SIZE))
guestaddr -= prefix;
- if (guestaddr > memsize)
- return (void __user __force *) ERR_PTR(-EFAULT);
-
- guestaddr += origin;
-
- return (void __user *) guestaddr;
+ return (void __user *) gmap_fault(guestaddr, vcpu->arch.gmap);
}
static inline int get_guest_u64(struct kvm_vcpu *vcpu, unsigned long guestaddr,
@@ -141,11 +134,11 @@ static inline int put_guest_u8(struct kvm_vcpu *vcpu, unsigned long guestaddr,
static inline int __copy_to_guest_slow(struct kvm_vcpu *vcpu,
unsigned long guestdest,
- const void *from, unsigned long n)
+ void *from, unsigned long n)
{
int rc;
unsigned long i;
- const u8 *data = from;
+ u8 *data = from;
for (i = 0; i < n; i++) {
rc = put_guest_u8(vcpu, guestdest++, *(data++));
@@ -155,12 +148,95 @@ static inline int __copy_to_guest_slow(struct kvm_vcpu *vcpu,
return 0;
}
+static inline int __copy_to_guest_fast(struct kvm_vcpu *vcpu,
+ unsigned long guestdest,
+ void *from, unsigned long n)
+{
+ int r;
+ void __user *uptr;
+ unsigned long size;
+
+ if (guestdest + n < guestdest)
+ return -EFAULT;
+
+ /* simple case: all within one segment table entry? */
+ if ((guestdest & PMD_MASK) == ((guestdest+n) & PMD_MASK)) {
+ uptr = (void __user *) gmap_fault(guestdest, vcpu->arch.gmap);
+
+ if (IS_ERR((void __force *) uptr))
+ return PTR_ERR((void __force *) uptr);
+
+ r = copy_to_user(uptr, from, n);
+
+ if (r)
+ r = -EFAULT;
+
+ goto out;
+ }
+
+ /* copy first segment */
+ uptr = (void __user *)gmap_fault(guestdest, vcpu->arch.gmap);
+
+ if (IS_ERR((void __force *) uptr))
+ return PTR_ERR((void __force *) uptr);
+
+ size = PMD_SIZE - (guestdest & ~PMD_MASK);
+
+ r = copy_to_user(uptr, from, size);
+
+ if (r) {
+ r = -EFAULT;
+ goto out;
+ }
+ from += size;
+ n -= size;
+ guestdest += size;
+
+ /* copy full segments */
+ while (n >= PMD_SIZE) {
+ uptr = (void __user *)gmap_fault(guestdest, vcpu->arch.gmap);
+
+ if (IS_ERR((void __force *) uptr))
+ return PTR_ERR((void __force *) uptr);
+
+ r = copy_to_user(uptr, from, PMD_SIZE);
+
+ if (r) {
+ r = -EFAULT;
+ goto out;
+ }
+ from += PMD_SIZE;
+ n -= PMD_SIZE;
+ guestdest += PMD_SIZE;
+ }
+
+ /* copy the tail segment */
+ if (n) {
+ uptr = (void __user *)gmap_fault(guestdest, vcpu->arch.gmap);
+
+ if (IS_ERR((void __force *) uptr))
+ return PTR_ERR((void __force *) uptr);
+
+ r = copy_to_user(uptr, from, n);
+
+ if (r)
+ r = -EFAULT;
+ }
+out:
+ return r;
+}
+
+static inline int copy_to_guest_absolute(struct kvm_vcpu *vcpu,
+ unsigned long guestdest,
+ void *from, unsigned long n)
+{
+ return __copy_to_guest_fast(vcpu, guestdest, from, n);
+}
+
static inline int copy_to_guest(struct kvm_vcpu *vcpu, unsigned long guestdest,
- const void *from, unsigned long n)
+ void *from, unsigned long n)
{
unsigned long prefix = vcpu->arch.sie_block->prefix;
- unsigned long origin = vcpu->arch.sie_block->gmsor;
- unsigned long memsize = kvm_s390_vcpu_get_memsize(vcpu);
if ((guestdest < 2 * PAGE_SIZE) && (guestdest + n > 2 * PAGE_SIZE))
goto slowpath;
@@ -177,15 +253,7 @@ static inline int copy_to_guest(struct kvm_vcpu *vcpu, unsigned long guestdest,
else if ((guestdest >= prefix) && (guestdest < prefix + 2 * PAGE_SIZE))
guestdest -= prefix;
- if (guestdest + n > memsize)
- return -EFAULT;
-
- if (guestdest + n < guestdest)
- return -EFAULT;
-
- guestdest += origin;
-
- return copy_to_user((void __user *) guestdest, from, n);
+ return __copy_to_guest_fast(vcpu, guestdest, from, n);
slowpath:
return __copy_to_guest_slow(vcpu, guestdest, from, n);
}
@@ -206,74 +274,113 @@ static inline int __copy_from_guest_slow(struct kvm_vcpu *vcpu, void *to,
return 0;
}
-static inline int copy_from_guest(struct kvm_vcpu *vcpu, void *to,
- unsigned long guestsrc, unsigned long n)
+static inline int __copy_from_guest_fast(struct kvm_vcpu *vcpu, void *to,
+ unsigned long guestsrc,
+ unsigned long n)
{
- unsigned long prefix = vcpu->arch.sie_block->prefix;
- unsigned long origin = vcpu->arch.sie_block->gmsor;
- unsigned long memsize = kvm_s390_vcpu_get_memsize(vcpu);
+ int r;
+ void __user *uptr;
+ unsigned long size;
- if ((guestsrc < 2 * PAGE_SIZE) && (guestsrc + n > 2 * PAGE_SIZE))
- goto slowpath;
+ if (guestsrc + n < guestsrc)
+ return -EFAULT;
- if ((guestsrc < prefix) && (guestsrc + n > prefix))
- goto slowpath;
+ /* simple case: all within one segment table entry? */
+ if ((guestsrc & PMD_MASK) == ((guestsrc+n) & PMD_MASK)) {
+ uptr = (void __user *) gmap_fault(guestsrc, vcpu->arch.gmap);
- if ((guestsrc < prefix + 2 * PAGE_SIZE)
- && (guestsrc + n > prefix + 2 * PAGE_SIZE))
- goto slowpath;
+ if (IS_ERR((void __force *) uptr))
+ return PTR_ERR((void __force *) uptr);
- if (guestsrc < 2 * PAGE_SIZE)
- guestsrc += prefix;
- else if ((guestsrc >= prefix) && (guestsrc < prefix + 2 * PAGE_SIZE))
- guestsrc -= prefix;
+ r = copy_from_user(to, uptr, n);
- if (guestsrc + n > memsize)
- return -EFAULT;
+ if (r)
+ r = -EFAULT;
- if (guestsrc + n < guestsrc)
- return -EFAULT;
+ goto out;
+ }
- guestsrc += origin;
+ /* copy first segment */
+ uptr = (void __user *)gmap_fault(guestsrc, vcpu->arch.gmap);
- return copy_from_user(to, (void __user *) guestsrc, n);
-slowpath:
- return __copy_from_guest_slow(vcpu, to, guestsrc, n);
-}
+ if (IS_ERR((void __force *) uptr))
+ return PTR_ERR((void __force *) uptr);
-static inline int copy_to_guest_absolute(struct kvm_vcpu *vcpu,
- unsigned long guestdest,
- const void *from, unsigned long n)
-{
- unsigned long origin = vcpu->arch.sie_block->gmsor;
- unsigned long memsize = kvm_s390_vcpu_get_memsize(vcpu);
+ size = PMD_SIZE - (guestsrc & ~PMD_MASK);
- if (guestdest + n > memsize)
- return -EFAULT;
+ r = copy_from_user(to, uptr, size);
- if (guestdest + n < guestdest)
- return -EFAULT;
+ if (r) {
+ r = -EFAULT;
+ goto out;
+ }
+ to += size;
+ n -= size;
+ guestsrc += size;
+
+ /* copy full segments */
+ while (n >= PMD_SIZE) {
+ uptr = (void __user *)gmap_fault(guestsrc, vcpu->arch.gmap);
+
+ if (IS_ERR((void __force *) uptr))
+ return PTR_ERR((void __force *) uptr);
+
+ r = copy_from_user(to, uptr, PMD_SIZE);
+
+ if (r) {
+ r = -EFAULT;
+ goto out;
+ }
+ to += PMD_SIZE;
+ n -= PMD_SIZE;
+ guestsrc += PMD_SIZE;
+ }
+
+ /* copy the tail segment */
+ if (n) {
+ uptr = (void __user *)gmap_fault(guestsrc, vcpu->arch.gmap);
- guestdest += origin;
+ if (IS_ERR((void __force *) uptr))
+ return PTR_ERR((void __force *) uptr);
- return copy_to_user((void __user *) guestdest, from, n);
+ r = copy_from_user(to, uptr, n);
+
+ if (r)
+ r = -EFAULT;
+ }
+out:
+ return r;
}
static inline int copy_from_guest_absolute(struct kvm_vcpu *vcpu, void *to,
unsigned long guestsrc,
unsigned long n)
{
- unsigned long origin = vcpu->arch.sie_block->gmsor;
- unsigned long memsize = kvm_s390_vcpu_get_memsize(vcpu);
+ return __copy_from_guest_fast(vcpu, to, guestsrc, n);
+}
- if (guestsrc + n > memsize)
- return -EFAULT;
+static inline int copy_from_guest(struct kvm_vcpu *vcpu, void *to,
+ unsigned long guestsrc, unsigned long n)
+{
+ unsigned long prefix = vcpu->arch.sie_block->prefix;
- if (guestsrc + n < guestsrc)
- return -EFAULT;
+ if ((guestsrc < 2 * PAGE_SIZE) && (guestsrc + n > 2 * PAGE_SIZE))
+ goto slowpath;
- guestsrc += origin;
+ if ((guestsrc < prefix) && (guestsrc + n > prefix))
+ goto slowpath;
+
+ if ((guestsrc < prefix + 2 * PAGE_SIZE)
+ && (guestsrc + n > prefix + 2 * PAGE_SIZE))
+ goto slowpath;
+
+ if (guestsrc < 2 * PAGE_SIZE)
+ guestsrc += prefix;
+ else if ((guestsrc >= prefix) && (guestsrc < prefix + 2 * PAGE_SIZE))
+ guestsrc -= prefix;
- return copy_from_user(to, (void __user *) guestsrc, n);
+ return __copy_from_guest_fast(vcpu, to, guestsrc, n);
+slowpath:
+ return __copy_from_guest_slow(vcpu, to, guestsrc, n);
}
#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-19 19:14:21 +0000