Messages in this thread Patch in this message | | | From | Avi Kivity <> | Subject | [PATCH 6/7] KVM: Don't require explicit indication of completion of mmio or pio | Date | Sun, 29 Apr 2007 18:50:21 +0300 |
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It is illegal not to return from a pio or mmio request without completing it, as mmio or pio is an atomic operation. Therefore, we can simplify the userspace interface by avoiding the completion indication.
Signed-off-by: Avi Kivity <avi@qumranet.com> --- drivers/kvm/kvm_main.c | 28 +++++++++++++--------------- include/linux/kvm.h | 5 ++--- 2 files changed, 15 insertions(+), 18 deletions(-)
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index a9ba42f..4c5b8db 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -1237,8 +1237,10 @@ int emulate_instruction(struct kvm_vcpu *vcpu, kvm_arch_ops->decache_regs(vcpu); kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags); - if (vcpu->mmio_is_write) + if (vcpu->mmio_is_write) { + vcpu->mmio_needed = 0; return EMULATE_DO_MMIO; + } return EMULATE_DONE; } @@ -1692,8 +1694,6 @@ static int complete_pio(struct kvm_vcpu *vcpu) vcpu->regs[VCPU_REGS_RSI] += delta; } - vcpu->run->io_completed = 0; - kvm_arch_ops->decache_regs(vcpu); io->count -= io->cur_count; @@ -1800,20 +1800,18 @@ static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) /* re-sync apic's tpr */ vcpu->cr8 = kvm_run->cr8; - if (kvm_run->io_completed) { - if (vcpu->pio.cur_count) { - r = complete_pio(vcpu); - if (r) - goto out; - } else if (!vcpu->mmio_is_write) { - memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8); - vcpu->mmio_read_completed = 1; - emulate_instruction(vcpu, kvm_run, - vcpu->mmio_fault_cr2, 0); - } + if (vcpu->pio.cur_count) { + r = complete_pio(vcpu); + if (r) + goto out; } - vcpu->mmio_needed = 0; + if (vcpu->mmio_needed) { + memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8); + vcpu->mmio_read_completed = 1; + emulate_instruction(vcpu, kvm_run, vcpu->mmio_fault_cr2, 0); + vcpu->mmio_needed = 0; + } if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) { kvm_arch_ops->cache_regs(vcpu); diff --git a/include/linux/kvm.h b/include/linux/kvm.h index 07bf353..738c2f5 100644 --- a/include/linux/kvm.h +++ b/include/linux/kvm.h @@ -11,7 +11,7 @@ #include <asm/types.h> #include <linux/ioctl.h> -#define KVM_API_VERSION 10 +#define KVM_API_VERSION 11 /* * Architectural interrupt line count, and the size of the bitmap needed @@ -58,9 +58,8 @@ enum kvm_exit_reason { /* for KVM_RUN, returned by mmap(vcpu_fd, offset=0) */ struct kvm_run { /* in */ - __u32 io_completed; /* mmio/pio request completed */ __u8 request_interrupt_window; - __u8 padding1[3]; + __u8 padding1[7]; /* out */ __u32 exit_reason; -- 1.5.0.6 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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