diff options
author | Carsten Otte <cotte@de.ibm.com> | 2011-07-24 08:48:22 (GMT) |
---|---|---|
committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2011-07-24 08:48:21 (GMT) |
commit | 092670cd90eb88c33661de21f1b4ee08d2597171 (patch) | |
tree | 2960d3ef459eccd0c2a7d0e2a77fad9bdb2437f2 /arch/s390/kvm | |
parent | 598841ca9919d008b520114d8a4378c4ce4e40a1 (diff) | |
download | linux-fsl-qoriq-092670cd90eb88c33661de21f1b4ee08d2597171.tar.xz |
[S390] Use gmap translation for accessing guest memory
This patch removes kvm-s390 internal assumption of a linear mapping
of guest address space to user space. Previously, guest memory was
translated to user addresses using a fixed offset (gmsor). The new
code uses gmap_fault to resolve guest addresses.
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm')
-rw-r--r-- | arch/s390/kvm/gaccess.h | 243 | ||||
-rw-r--r-- | arch/s390/kvm/intercept.c | 24 | ||||
-rw-r--r-- | arch/s390/kvm/kvm-s390.c | 4 | ||||
-rw-r--r-- | arch/s390/kvm/kvm-s390.h | 23 | ||||
-rw-r--r-- | arch/s390/kvm/sigp.c | 6 |
5 files changed, 193 insertions, 107 deletions
diff --git a/arch/s390/kvm/gaccess.h b/arch/s390/kvm/gaccess.h index 03c716a..c86f6ae 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 diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c index 654fc1f..c7c5189 100644 --- a/arch/s390/kvm/intercept.c +++ b/arch/s390/kvm/intercept.c @@ -165,26 +165,30 @@ static int handle_validity(struct kvm_vcpu *vcpu) int rc; vcpu->stat.exit_validity++; - if ((viwhy == 0x37) && (vcpu->arch.sie_block->prefix - <= kvm_s390_vcpu_get_memsize(vcpu) - 2*PAGE_SIZE)) { - rc = fault_in_pages_writeable((char __user *) - vcpu->arch.sie_block->gmsor + - vcpu->arch.sie_block->prefix, - 2*PAGE_SIZE); + if (viwhy == 0x37) { + vmaddr = gmap_fault(vcpu->arch.sie_block->prefix, + vcpu->arch.gmap); + if (IS_ERR_VALUE(vmaddr)) { + rc = -EOPNOTSUPP; + goto out; + } + rc = fault_in_pages_writeable((char __user *) vmaddr, + PAGE_SIZE); if (rc) { /* user will receive sigsegv, exit to user */ rc = -EOPNOTSUPP; goto out; } - vmaddr = gmap_fault(vcpu->arch.sie_block->prefix, + vmaddr = gmap_fault(vcpu->arch.sie_block->prefix + PAGE_SIZE, vcpu->arch.gmap); if (IS_ERR_VALUE(vmaddr)) { rc = -EOPNOTSUPP; goto out; } - vmaddr = gmap_fault(vcpu->arch.sie_block->prefix + PAGE_SIZE, - vcpu->arch.gmap); - if (IS_ERR_VALUE(vmaddr)) { + rc = fault_in_pages_writeable((char __user *) vmaddr, + PAGE_SIZE); + if (rc) { + /* user will receive sigsegv, exit to user */ rc = -EOPNOTSUPP; goto out; } diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 3ebb4ba..5a99f34 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -549,7 +549,7 @@ rerun_vcpu: return rc; } -static int __guestcopy(struct kvm_vcpu *vcpu, u64 guestdest, const void *from, +static int __guestcopy(struct kvm_vcpu *vcpu, u64 guestdest, void *from, unsigned long n, int prefix) { if (prefix) @@ -566,7 +566,7 @@ static int __guestcopy(struct kvm_vcpu *vcpu, u64 guestdest, const void *from, */ int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr) { - const unsigned char archmode = 1; + unsigned char archmode = 1; int prefix; if (addr == KVM_S390_STORE_STATUS_NOADDR) { diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h index 65e2201..63e5190 100644 --- a/arch/s390/kvm/kvm-s390.h +++ b/arch/s390/kvm/kvm-s390.h @@ -58,31 +58,8 @@ int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code); int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action); -static inline long kvm_s390_vcpu_get_memsize(struct kvm_vcpu *vcpu) -{ - return vcpu->arch.sie_block->gmslm - - vcpu->arch.sie_block->gmsor - - VIRTIODESCSPACE + 1ul; -} - static inline void kvm_s390_vcpu_set_mem(struct kvm_vcpu *vcpu) { - int idx; - struct kvm_memory_slot *mem; - struct kvm_memslots *memslots; - - idx = srcu_read_lock(&vcpu->kvm->srcu); - memslots = kvm_memslots(vcpu->kvm); - - mem = &memslots->memslots[0]; - - vcpu->arch.sie_block->gmsor = mem->userspace_addr; - vcpu->arch.sie_block->gmslm = - mem->userspace_addr + - (mem->npages << PAGE_SHIFT) + - VIRTIODESCSPACE - 1ul; - - srcu_read_unlock(&vcpu->kvm->srcu, idx); } /* implemented in priv.c */ diff --git a/arch/s390/kvm/sigp.c b/arch/s390/kvm/sigp.c index 702276f..d6a50c1 100644 --- a/arch/s390/kvm/sigp.c +++ b/arch/s390/kvm/sigp.c @@ -189,10 +189,8 @@ static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address, /* make sure that the new value is valid memory */ address = address & 0x7fffe000u; - if ((copy_from_user(&tmp, (void __user *) - (address + vcpu->arch.sie_block->gmsor) , 1)) || - (copy_from_user(&tmp, (void __user *)(address + - vcpu->arch.sie_block->gmsor + PAGE_SIZE), 1))) { + if (copy_from_guest_absolute(vcpu, &tmp, address, 1) || + copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) { *reg |= SIGP_STAT_INVALID_PARAMETER; return 1; /* invalid parameter */ } |