From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: [PATCH 004/104] KVM: In-kernel string pio write support Date: Mon, 17 Sep 2007 10:30:46 +0200 Message-ID: <1190017946663-git-send-email-avi@qumranet.com> References: <11900179463203-git-send-email-avi@qumranet.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Return-path: In-Reply-To: <11900179463203-git-send-email-avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org From: Eddie Dong Add string pio write support to support some version of Windows. Signed-off-by: Yaozu (Eddie) Dong Signed-off-by: Avi Kivity --- drivers/kvm/kvm_main.c | 48 +++++++++++++++++++++++++++++++++++++----------- 1 files changed, 37 insertions(+), 11 deletions(-) diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index df9c05e..1be510b 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -1760,18 +1760,35 @@ static int complete_pio(struct kvm_vcpu *vcpu) return 0; } -void kernel_pio(struct kvm_io_device *pio_dev, struct kvm_vcpu *vcpu) +static void kernel_pio(struct kvm_io_device *pio_dev, + struct kvm_vcpu *vcpu, + void *pd) { /* TODO: String I/O for in kernel device */ if (vcpu->pio.in) kvm_iodevice_read(pio_dev, vcpu->pio.port, vcpu->pio.size, - vcpu->pio_data); + pd); else kvm_iodevice_write(pio_dev, vcpu->pio.port, vcpu->pio.size, - vcpu->pio_data); + pd); +} + +static void pio_string_write(struct kvm_io_device *pio_dev, + struct kvm_vcpu *vcpu) +{ + struct kvm_pio_request *io = &vcpu->pio; + void *pd = vcpu->pio_data; + int i; + + for (i = 0; i < io->cur_count; i++) { + kvm_iodevice_write(pio_dev, io->port, + io->size, + pd); + pd += io->size; + } } int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in, @@ -1779,7 +1796,7 @@ int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in, gva_t address, int rep, unsigned port) { unsigned now, in_page; - int i; + int i, ret = 0; int nr_pages = 1; struct page *page; struct kvm_io_device *pio_dev; @@ -1806,15 +1823,12 @@ int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in, memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4); kvm_arch_ops->decache_regs(vcpu); if (pio_dev) { - kernel_pio(pio_dev, vcpu); + kernel_pio(pio_dev, vcpu, vcpu->pio_data); complete_pio(vcpu); return 1; } return 0; } - /* TODO: String I/O for in kernel device */ - if (pio_dev) - printk(KERN_ERR "kvm_setup_pio: no string io support\n"); if (!count) { kvm_arch_ops->skip_emulated_instruction(vcpu); @@ -1862,9 +1876,21 @@ int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in, } } - if (!vcpu->pio.in) - return pio_copy_data(vcpu); - return 0; + if (!vcpu->pio.in) { + /* string PIO write */ + ret = pio_copy_data(vcpu); + if (ret >= 0 && pio_dev) { + pio_string_write(pio_dev, vcpu); + complete_pio(vcpu); + if (vcpu->pio.count == 0) + ret = 1; + } + } else if (pio_dev) + printk(KERN_ERR "no string pio read support yet, " + "port %x size %d count %ld\n", + port, size, count); + + return ret; } EXPORT_SYMBOL_GPL(kvm_setup_pio); -- 1.5.3 ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/