mirror of https://github.com/xemu-project/xemu.git
KVM: x86: Refactor persistent CPU state
This patch aligns the KVM-related layout and encoding of the CPU state to be saved to disk or migrated with qemu-kvm. The major differences are reordering of fields and a compressed interrupt_bitmap into a single number as there can be no more than one pending IRQ at a time. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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@ -28,7 +28,8 @@ void cpu_save(QEMUFile *f, void *opaque)
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uint16_t fptag, fpus, fpuc, fpregs_format;
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uint32_t hflags;
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int32_t a20_mask;
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int i;
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int32_t pending_irq;
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int i, bit;
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cpu_synchronize_state(env, 0);
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@ -141,11 +142,21 @@ void cpu_save(QEMUFile *f, void *opaque)
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qemu_put_be64s(f, &env->mtrr_var[i].mask);
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}
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for (i = 0; i < sizeof(env->interrupt_bitmap)/8; i++) {
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qemu_put_be64s(f, &env->interrupt_bitmap[i]);
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/* KVM-related states */
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/* There can only be one pending IRQ set in the bitmap at a time, so try
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to find it and save its number instead (-1 for none). */
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pending_irq = -1;
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for (i = 0; i < ARRAY_SIZE(env->interrupt_bitmap); i++) {
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bit = ffsll(env->interrupt_bitmap[i]);
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if (bit) {
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pending_irq = i * 64 + bit - 1;
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break;
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}
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}
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qemu_put_be64s(f, &env->tsc);
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qemu_put_sbe32s(f, &pending_irq);
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qemu_put_be32s(f, &env->mp_state);
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qemu_put_be64s(f, &env->tsc);
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}
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#ifdef USE_X86LDOUBLE
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@ -179,6 +190,7 @@ int cpu_load(QEMUFile *f, void *opaque, int version_id)
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uint32_t hflags;
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uint16_t fpus, fpuc, fptag, fpregs_format;
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int32_t a20_mask;
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int32_t pending_irq;
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if (version_id < 3 || version_id > CPU_SAVE_VERSION)
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return -EINVAL;
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@ -324,12 +336,16 @@ int cpu_load(QEMUFile *f, void *opaque, int version_id)
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qemu_get_be64s(f, &env->mtrr_var[i].mask);
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}
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}
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if (version_id >= 9) {
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for (i = 0; i < sizeof(env->interrupt_bitmap)/8; i++) {
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qemu_get_be64s(f, &env->interrupt_bitmap[i]);
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qemu_get_sbe32s(f, &pending_irq);
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memset(&env->interrupt_bitmap, 0, sizeof(env->interrupt_bitmap));
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if (pending_irq >= 0) {
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env->interrupt_bitmap[pending_irq / 64] |=
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(uint64_t)1 << (pending_irq % 64);
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}
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qemu_get_be64s(f, &env->tsc);
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qemu_get_be32s(f, &env->mp_state);
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qemu_get_be64s(f, &env->tsc);
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}
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/* XXX: ensure compatiblity for halted bit ? */
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