env->psa is a 64bit value, while we copy 4 bytes into the save area,
resulting always in 0 getting stored.
Let's try to reduce such errors by using a proper structure. While at
it, use correct cpu->be conversion (and get_psw_mask()), as we will be
reusing this code for TCG soon.
Signed-off-by: David Hildenbrand <david@redhat.com>
---
v1 -> v2:
- dropped QEMU_PACKED
- Moved QEMU_BUILD_BUG_ON()
- Retested if it works now
target/s390x/kvm.c | 62 ++++++++++++++++++++++++++++++++++++------------------
1 file changed, 42 insertions(+), 20 deletions(-)
diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c
index ebb75cafaa..b63fcc5f1f 100644
--- a/target/s390x/kvm.c
+++ b/target/s390x/kvm.c
@@ -1553,22 +1553,37 @@ static int do_store_adtl_status(S390CPU *cpu, hwaddr addr, hwaddr len)
return 0;
}
+struct sigp_save_area {
+ uint64_t fprs[16]; /* 0x0000 */
+ uint64_t grs[16]; /* 0x0080 */
+ PSW psw; /* 0x0100 */
+ uint8_t pad_0x0110[0x0118 - 0x0110]; /* 0x0110 */
+ uint32_t prefix; /* 0x0118 */
+ uint32_t fpc; /* 0x011c */
+ uint8_t pad_0x0120[0x0124 - 0x0120]; /* 0x0120 */
+ uint32_t todpr; /* 0x0124 */
+ uint64_t cputm; /* 0x0128 */
+ uint64_t ckc; /* 0x0130 */
+ uint8_t pad_0x0138[0x0140 - 0x0138]; /* 0x0138 */
+ uint32_t ars[16]; /* 0x0140 */
+ uint64_t crs[16]; /* 0x0384 */
+};
+QEMU_BUILD_BUG_ON(sizeof(struct sigp_save_area) != 512);
+
#define KVM_S390_STORE_STATUS_DEF_ADDR offsetof(LowCore, floating_pt_save_area)
-#define SAVE_AREA_SIZE 512
static int kvm_s390_store_status(S390CPU *cpu, hwaddr addr, bool store_arch)
{
static const uint8_t ar_id = 1;
- uint64_t ckc = cpu->env.ckc >> 8;
- void *mem;
+ struct sigp_save_area *sa;
+ hwaddr len = sizeof(*sa);
int i;
- hwaddr len = SAVE_AREA_SIZE;
- mem = cpu_physical_memory_map(addr, &len, 1);
- if (!mem) {
+ sa = cpu_physical_memory_map(addr, &len, 1);
+ if (!sa) {
return -EFAULT;
}
- if (len != SAVE_AREA_SIZE) {
- cpu_physical_memory_unmap(mem, len, 1, 0);
+ if (len != sizeof(*sa)) {
+ cpu_physical_memory_unmap(sa, len, 1, 0);
return -EFAULT;
}
@@ -1576,19 +1591,26 @@ static int kvm_s390_store_status(S390CPU *cpu, hwaddr addr, bool store_arch)
cpu_physical_memory_write(offsetof(LowCore, ar_access_id), &ar_id, 1);
}
for (i = 0; i < 16; ++i) {
- *((uint64_t *)mem + i) = get_freg(&cpu->env, i)->ll;
- }
- memcpy(mem + 128, &cpu->env.regs, 128);
- memcpy(mem + 256, &cpu->env.psw, 16);
- memcpy(mem + 280, &cpu->env.psa, 4);
- memcpy(mem + 284, &cpu->env.fpc, 4);
- memcpy(mem + 292, &cpu->env.todpr, 4);
- memcpy(mem + 296, &cpu->env.cputm, 8);
- memcpy(mem + 304, &ckc, 8);
- memcpy(mem + 320, &cpu->env.aregs, 64);
- memcpy(mem + 384, &cpu->env.cregs, 128);
+ sa->fprs[i] = cpu_to_be64(get_freg(&cpu->env, i)->ll);
+ }
+ for (i = 0; i < 16; ++i) {
+ sa->grs[i] = cpu_to_be64(cpu->env.regs[i]);
+ }
+ sa->psw.addr = cpu_to_be64(cpu->env.psw.addr);
+ sa->psw.mask = cpu_to_be64(get_psw_mask(&cpu->env));
+ sa->prefix = cpu_to_be32(cpu->env.psa);
+ sa->fpc = cpu_to_be32(cpu->env.fpc);
+ sa->todpr = cpu_to_be32(cpu->env.todpr);
+ sa->cputm = cpu_to_be64(cpu->env.cputm);
+ sa->ckc = cpu_to_be64(cpu->env.ckc >> 8);
+ for (i = 0; i < 16; ++i) {
+ sa->ars[i] = cpu_to_be32(cpu->env.aregs[i]);
+ }
+ for (i = 0; i < 16; ++i) {
+ sa->ars[i] = cpu_to_be64(cpu->env.cregs[i]);
+ }
- cpu_physical_memory_unmap(mem, len, 1, len);
+ cpu_physical_memory_unmap(sa, len, 1, len);
return 0;
}
--
2.13.5
On 09/22/2017 09:03 AM, David Hildenbrand wrote: > env->psa is a 64bit value, while we copy 4 bytes into the save area, > resulting always in 0 getting stored. > > Let's try to reduce such errors by using a proper structure. While at > it, use correct cpu->be conversion (and get_psw_mask()), as we will be > reusing this code for TCG soon. > > Signed-off-by: David Hildenbrand <david@redhat.com> > --- > > v1 -> v2: > - dropped QEMU_PACKED > - Moved QEMU_BUILD_BUG_ON() > - Retested if it works now > > target/s390x/kvm.c | 62 ++++++++++++++++++++++++++++++++++++------------------ > 1 file changed, 42 insertions(+), 20 deletions(-) Reviewed-by: Richard Henderson <richard.henderson@linaro.org> r~
On 22.09.2017 16:03, David Hildenbrand wrote: > env->psa is a 64bit value, while we copy 4 bytes into the save area, > resulting always in 0 getting stored. > > Let's try to reduce such errors by using a proper structure. While at > it, use correct cpu->be conversion (and get_psw_mask()), as we will be > reusing this code for TCG soon. > > Signed-off-by: David Hildenbrand <david@redhat.com> > --- > > v1 -> v2: > - dropped QEMU_PACKED > - Moved QEMU_BUILD_BUG_ON() > - Retested if it works now > > target/s390x/kvm.c | 62 ++++++++++++++++++++++++++++++++++++------------------ > 1 file changed, 42 insertions(+), 20 deletions(-) > > diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c > index ebb75cafaa..b63fcc5f1f 100644 > --- a/target/s390x/kvm.c > +++ b/target/s390x/kvm.c > @@ -1553,22 +1553,37 @@ static int do_store_adtl_status(S390CPU *cpu, hwaddr addr, hwaddr len) > return 0; > } > > +struct sigp_save_area { > + uint64_t fprs[16]; /* 0x0000 */ > + uint64_t grs[16]; /* 0x0080 */ > + PSW psw; /* 0x0100 */ > + uint8_t pad_0x0110[0x0118 - 0x0110]; /* 0x0110 */ > + uint32_t prefix; /* 0x0118 */ > + uint32_t fpc; /* 0x011c */ > + uint8_t pad_0x0120[0x0124 - 0x0120]; /* 0x0120 */ > + uint32_t todpr; /* 0x0124 */ > + uint64_t cputm; /* 0x0128 */ > + uint64_t ckc; /* 0x0130 */ > + uint8_t pad_0x0138[0x0140 - 0x0138]; /* 0x0138 */ > + uint32_t ars[16]; /* 0x0140 */ > + uint64_t crs[16]; /* 0x0384 */ > +}; > +QEMU_BUILD_BUG_ON(sizeof(struct sigp_save_area) != 512); > + > #define KVM_S390_STORE_STATUS_DEF_ADDR offsetof(LowCore, floating_pt_save_area) > -#define SAVE_AREA_SIZE 512 > static int kvm_s390_store_status(S390CPU *cpu, hwaddr addr, bool store_arch) > { > static const uint8_t ar_id = 1; > - uint64_t ckc = cpu->env.ckc >> 8; > - void *mem; > + struct sigp_save_area *sa; > + hwaddr len = sizeof(*sa); > int i; > - hwaddr len = SAVE_AREA_SIZE; > > - mem = cpu_physical_memory_map(addr, &len, 1); > - if (!mem) { > + sa = cpu_physical_memory_map(addr, &len, 1); > + if (!sa) { > return -EFAULT; > } > - if (len != SAVE_AREA_SIZE) { > - cpu_physical_memory_unmap(mem, len, 1, 0); > + if (len != sizeof(*sa)) { > + cpu_physical_memory_unmap(sa, len, 1, 0); > return -EFAULT; > } > > @@ -1576,19 +1591,26 @@ static int kvm_s390_store_status(S390CPU *cpu, hwaddr addr, bool store_arch) > cpu_physical_memory_write(offsetof(LowCore, ar_access_id), &ar_id, 1); > } > for (i = 0; i < 16; ++i) { > - *((uint64_t *)mem + i) = get_freg(&cpu->env, i)->ll; > - } > - memcpy(mem + 128, &cpu->env.regs, 128); > - memcpy(mem + 256, &cpu->env.psw, 16); > - memcpy(mem + 280, &cpu->env.psa, 4); > - memcpy(mem + 284, &cpu->env.fpc, 4); > - memcpy(mem + 292, &cpu->env.todpr, 4); > - memcpy(mem + 296, &cpu->env.cputm, 8); > - memcpy(mem + 304, &ckc, 8); > - memcpy(mem + 320, &cpu->env.aregs, 64); > - memcpy(mem + 384, &cpu->env.cregs, 128); > + sa->fprs[i] = cpu_to_be64(get_freg(&cpu->env, i)->ll); > + } > + for (i = 0; i < 16; ++i) { > + sa->grs[i] = cpu_to_be64(cpu->env.regs[i]); > + } > + sa->psw.addr = cpu_to_be64(cpu->env.psw.addr); > + sa->psw.mask = cpu_to_be64(get_psw_mask(&cpu->env)); > + sa->prefix = cpu_to_be32(cpu->env.psa); > + sa->fpc = cpu_to_be32(cpu->env.fpc); > + sa->todpr = cpu_to_be32(cpu->env.todpr); > + sa->cputm = cpu_to_be64(cpu->env.cputm); > + sa->ckc = cpu_to_be64(cpu->env.ckc >> 8); > + for (i = 0; i < 16; ++i) { > + sa->ars[i] = cpu_to_be32(cpu->env.aregs[i]); > + } > + for (i = 0; i < 16; ++i) { > + sa->ars[i] = cpu_to_be64(cpu->env.cregs[i]); > + } > > - cpu_physical_memory_unmap(mem, len, 1, len); > + cpu_physical_memory_unmap(sa, len, 1, len); > > return 0; > } Reviewed-by: Thomas Huth <thuth@redhat.com>
On Fri, 22 Sep 2017 16:03:38 +0200 David Hildenbrand <david@redhat.com> wrote: > env->psa is a 64bit value, while we copy 4 bytes into the save area, > resulting always in 0 getting stored. > > Let's try to reduce such errors by using a proper structure. While at > it, use correct cpu->be conversion (and get_psw_mask()), as we will be > reusing this code for TCG soon. > > Signed-off-by: David Hildenbrand <david@redhat.com> > --- > > v1 -> v2: > - dropped QEMU_PACKED > - Moved QEMU_BUILD_BUG_ON() > - Retested if it works now Testing? What's going on here? :) > > target/s390x/kvm.c | 62 ++++++++++++++++++++++++++++++++++++------------------ > 1 file changed, 42 insertions(+), 20 deletions(-) Thanks, applied.
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