linux-kernel - [PATCH 004/104] KVM: In-kernel string pio write support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1190017946663-git-send-email-avi@qumranet.com>
Date:	Mon, 17 Sep 2007 10:30:46 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	kvm-devel@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org, Eddie Dong <eddie.dong@...el.com>
Subject: [PATCH 004/104] KVM: In-kernel string pio write support

From: Eddie Dong <eddie.dong@...el.com>

Add string pio write support to support some version of Windows.

Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@...el.com>
Signed-off-by: Avi Kivity <avi@...ranet.com>
---
 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

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/