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authorDavid Gibson <david@gibson.dropbear.id.au>2013-02-20 16:41:51 +0000
committerAlexander Graf <agraf@suse.de>2013-03-08 21:04:52 +0100
commit70b79849b84510604e46299672e663a703ad5a4b (patch)
tree1c61cab9c29b7043de7d604cc2238cd38ff7b589 /target-ppc/kvm.c
parentd67d40ea07577b0a952d3bea5a2f92edf0ee26a6 (diff)
target-ppc: Synchronize FPU state with KVM
Currently qemu does not get and put the state of the floating point and vector registers to KVM. This is obviously a problem for savevm, as well as possibly being problematic for debugging of FP-using guests. This patch fixes this by using new extensions to the ONE_REG interface to synchronize the qemu floating point state with KVM. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'target-ppc/kvm.c')
-rw-r--r--target-ppc/kvm.c130
1 files changed, 130 insertions, 0 deletions
diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c
index 02ab559836..44511592b4 100644
--- a/target-ppc/kvm.c
+++ b/target-ppc/kvm.c
@@ -521,6 +521,132 @@ static void kvm_put_one_spr(CPUState *cs, uint64_t id, int spr)
}
}
+static int kvm_put_fp(CPUState *cs)
+{
+ PowerPCCPU *cpu = POWERPC_CPU(cs);
+ CPUPPCState *env = &cpu->env;
+ struct kvm_one_reg reg;
+ int i;
+ int ret;
+
+ if (env->insns_flags & PPC_FLOAT) {
+ uint64_t fpscr = env->fpscr;
+ bool vsx = !!(env->insns_flags2 & PPC2_VSX);
+
+ reg.id = KVM_REG_PPC_FPSCR;
+ reg.addr = (uintptr_t)&fpscr;
+ ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
+ if (ret < 0) {
+ dprintf("Unable to set FPSCR to KVM: %s\n", strerror(errno));
+ return ret;
+ }
+
+ for (i = 0; i < 32; i++) {
+ uint64_t vsr[2];
+
+ vsr[0] = float64_val(env->fpr[i]);
+ vsr[1] = env->vsr[i];
+ reg.addr = (uintptr_t) &vsr;
+ reg.id = vsx ? KVM_REG_PPC_VSR(i) : KVM_REG_PPC_FPR(i);
+
+ ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
+ if (ret < 0) {
+ dprintf("Unable to set %s%d to KVM: %s\n", vsx ? "VSR" : "FPR",
+ i, strerror(errno));
+ return ret;
+ }
+ }
+ }
+
+ if (env->insns_flags & PPC_ALTIVEC) {
+ reg.id = KVM_REG_PPC_VSCR;
+ reg.addr = (uintptr_t)&env->vscr;
+ ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
+ if (ret < 0) {
+ dprintf("Unable to set VSCR to KVM: %s\n", strerror(errno));
+ return ret;
+ }
+
+ for (i = 0; i < 32; i++) {
+ reg.id = KVM_REG_PPC_VR(i);
+ reg.addr = (uintptr_t)&env->avr[i];
+ ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
+ if (ret < 0) {
+ dprintf("Unable to set VR%d to KVM: %s\n", i, strerror(errno));
+ return ret;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int kvm_get_fp(CPUState *cs)
+{
+ PowerPCCPU *cpu = POWERPC_CPU(cs);
+ CPUPPCState *env = &cpu->env;
+ struct kvm_one_reg reg;
+ int i;
+ int ret;
+
+ if (env->insns_flags & PPC_FLOAT) {
+ uint64_t fpscr;
+ bool vsx = !!(env->insns_flags2 & PPC2_VSX);
+
+ reg.id = KVM_REG_PPC_FPSCR;
+ reg.addr = (uintptr_t)&fpscr;
+ ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
+ if (ret < 0) {
+ dprintf("Unable to get FPSCR from KVM: %s\n", strerror(errno));
+ return ret;
+ } else {
+ env->fpscr = fpscr;
+ }
+
+ for (i = 0; i < 32; i++) {
+ uint64_t vsr[2];
+
+ reg.addr = (uintptr_t) &vsr;
+ reg.id = vsx ? KVM_REG_PPC_VSR(i) : KVM_REG_PPC_FPR(i);
+
+ ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
+ if (ret < 0) {
+ dprintf("Unable to get %s%d from KVM: %s\n",
+ vsx ? "VSR" : "FPR", i, strerror(errno));
+ return ret;
+ } else {
+ env->fpr[i] = vsr[0];
+ if (vsx) {
+ env->vsr[i] = vsr[1];
+ }
+ }
+ }
+ }
+
+ if (env->insns_flags & PPC_ALTIVEC) {
+ reg.id = KVM_REG_PPC_VSCR;
+ reg.addr = (uintptr_t)&env->vscr;
+ ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
+ if (ret < 0) {
+ dprintf("Unable to get VSCR from KVM: %s\n", strerror(errno));
+ return ret;
+ }
+
+ for (i = 0; i < 32; i++) {
+ reg.id = KVM_REG_PPC_VR(i);
+ reg.addr = (uintptr_t)&env->avr[i];
+ ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
+ if (ret < 0) {
+ dprintf("Unable to get VR%d from KVM: %s\n",
+ i, strerror(errno));
+ return ret;
+ }
+ }
+ }
+
+ return 0;
+}
+
int kvm_arch_put_registers(CPUState *cs, int level)
{
PowerPCCPU *cpu = POWERPC_CPU(cs);
@@ -561,6 +687,8 @@ int kvm_arch_put_registers(CPUState *cs, int level)
if (ret < 0)
return ret;
+ kvm_put_fp(cs);
+
if (env->tlb_dirty) {
kvm_sw_tlb_put(cpu);
env->tlb_dirty = false;
@@ -666,6 +794,8 @@ int kvm_arch_get_registers(CPUState *cs)
for (i = 0;i < 32; i++)
env->gpr[i] = regs.gpr[i];
+ kvm_get_fp(cs);
+
if (cap_booke_sregs) {
ret = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs);
if (ret < 0) {