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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/arm64/kvm/reset.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/arm64/kvm/reset.c')
-rw-r--r--kernel/arch/arm64/kvm/reset.c111
1 files changed, 111 insertions, 0 deletions
diff --git a/kernel/arch/arm64/kvm/reset.c b/kernel/arch/arm64/kvm/reset.c
new file mode 100644
index 000000000..0b4326578
--- /dev/null
+++ b/kernel/arch/arm64/kvm/reset.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * Derived from arch/arm/kvm/reset.c
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@virtualopensystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/errno.h>
+#include <linux/kvm_host.h>
+#include <linux/kvm.h>
+
+#include <kvm/arm_arch_timer.h>
+
+#include <asm/cputype.h>
+#include <asm/ptrace.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_coproc.h>
+
+/*
+ * ARMv8 Reset Values
+ */
+static const struct kvm_regs default_regs_reset = {
+ .regs.pstate = (PSR_MODE_EL1h | PSR_A_BIT | PSR_I_BIT |
+ PSR_F_BIT | PSR_D_BIT),
+};
+
+static const struct kvm_regs default_regs_reset32 = {
+ .regs.pstate = (COMPAT_PSR_MODE_SVC | COMPAT_PSR_A_BIT |
+ COMPAT_PSR_I_BIT | COMPAT_PSR_F_BIT),
+};
+
+static const struct kvm_irq_level default_vtimer_irq = {
+ .irq = 27,
+ .level = 1,
+};
+
+static bool cpu_has_32bit_el1(void)
+{
+ u64 pfr0;
+
+ pfr0 = read_cpuid(ID_AA64PFR0_EL1);
+ return !!(pfr0 & 0x20);
+}
+
+int kvm_arch_dev_ioctl_check_extension(long ext)
+{
+ int r;
+
+ switch (ext) {
+ case KVM_CAP_ARM_EL1_32BIT:
+ r = cpu_has_32bit_el1();
+ break;
+ default:
+ r = 0;
+ }
+
+ return r;
+}
+
+/**
+ * kvm_reset_vcpu - sets core registers and sys_regs to reset value
+ * @vcpu: The VCPU pointer
+ *
+ * This function finds the right table above and sets the registers on
+ * the virtual CPU struct to their architectually defined reset
+ * values.
+ */
+int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
+{
+ const struct kvm_irq_level *cpu_vtimer_irq;
+ const struct kvm_regs *cpu_reset;
+
+ switch (vcpu->arch.target) {
+ default:
+ if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features)) {
+ if (!cpu_has_32bit_el1())
+ return -EINVAL;
+ cpu_reset = &default_regs_reset32;
+ } else {
+ cpu_reset = &default_regs_reset;
+ }
+
+ cpu_vtimer_irq = &default_vtimer_irq;
+ break;
+ }
+
+ /* Reset core registers */
+ memcpy(vcpu_gp_regs(vcpu), cpu_reset, sizeof(*cpu_reset));
+
+ /* Reset system registers */
+ kvm_reset_sys_regs(vcpu);
+
+ /* Reset timer */
+ kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq);
+
+ return 0;
+}