CVE-2016-1981: infinite loop in e1000 (bz #1299995) Fix Out-of-bounds read in usb-ehci (bz #1300234, bz #1299455) CVE-2016-2197: ahci: null pointer dereference (bz #1302952) Fix gdbstub for VSX registers for ppc64 (bz #1304377) Fix qemu-img vmdk images to work with VMware (bz #1299185)
86 lines
2.4 KiB
Diff
86 lines
2.4 KiB
Diff
From: Greg Kurz <gkurz@linux.vnet.ibm.com>
|
|
Date: Fri, 15 Jan 2016 16:00:12 +0100
|
|
Subject: [PATCH] target-ppc: kvm: fix floating point registers sync on
|
|
little-endian hosts
|
|
|
|
On VSX capable CPUs, the 32 FP registers are mapped to the high-bits
|
|
of the 32 first VSX registers. So if you have:
|
|
|
|
VSR31 = (uint128) 0x0102030405060708090a0b0c0d0e0f00
|
|
|
|
then
|
|
|
|
FPR31 = (uint64) 0x0102030405060708
|
|
|
|
The kernel stores the VSX registers in the fp_state struct following the
|
|
host endian element ordering.
|
|
|
|
On big-endian:
|
|
|
|
fp_state.fpr[31][0] = 0x0102030405060708
|
|
fp_state.fpr[31][1] = 0x090a0b0c0d0e0f00
|
|
|
|
On little-endian:
|
|
|
|
fp_state.fpr[31][0] = 0x090a0b0c0d0e0f00
|
|
fp_state.fpr[31][1] = 0x0102030405060708
|
|
|
|
The KVM_GET_ONE_REG and KVM_SET_ONE_REG ioctls preserve this ordering, but
|
|
QEMU considers it as big-endian and always copies element [0] to the
|
|
fpr[] array and element [1] to the vsr[] array. This does not work with
|
|
little-endian hosts, and you will get:
|
|
|
|
(qemu) p $f31
|
|
0x90a0b0c0d0e0f00
|
|
|
|
instead of:
|
|
|
|
(qemu) p $f31
|
|
0x102030405060708
|
|
|
|
This patch fixes the element ordering for little-endian hosts.
|
|
|
|
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
|
|
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
|
|
(cherry picked from commit 3a4b791b4c13e02537a5cc572fa3de70bc5f68da)
|
|
---
|
|
target-ppc/kvm.c | 12 ++++++++++++
|
|
1 file changed, 12 insertions(+)
|
|
|
|
diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c
|
|
index ac70f08..acd3275 100644
|
|
--- a/target-ppc/kvm.c
|
|
+++ b/target-ppc/kvm.c
|
|
@@ -650,8 +650,13 @@ static int kvm_put_fp(CPUState *cs)
|
|
for (i = 0; i < 32; i++) {
|
|
uint64_t vsr[2];
|
|
|
|
+#ifdef HOST_WORDS_BIGENDIAN
|
|
vsr[0] = float64_val(env->fpr[i]);
|
|
vsr[1] = env->vsr[i];
|
|
+#else
|
|
+ vsr[0] = env->vsr[i];
|
|
+ vsr[1] = float64_val(env->fpr[i]);
|
|
+#endif
|
|
reg.addr = (uintptr_t) &vsr;
|
|
reg.id = vsx ? KVM_REG_PPC_VSR(i) : KVM_REG_PPC_FPR(i);
|
|
|
|
@@ -721,10 +726,17 @@ static int kvm_get_fp(CPUState *cs)
|
|
vsx ? "VSR" : "FPR", i, strerror(errno));
|
|
return ret;
|
|
} else {
|
|
+#ifdef HOST_WORDS_BIGENDIAN
|
|
env->fpr[i] = vsr[0];
|
|
if (vsx) {
|
|
env->vsr[i] = vsr[1];
|
|
}
|
|
+#else
|
|
+ env->fpr[i] = vsr[1];
|
|
+ if (vsx) {
|
|
+ env->vsr[i] = vsr[0];
|
|
+ }
|
|
+#endif
|
|
}
|
|
}
|
|
}
|