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authorMarc Zyngier <marc.zyngier@arm.com>2012-12-10 16:23:59 +0000
committerMarc Zyngier <marc.zyngier@arm.com>2013-06-07 14:03:37 +0100
commitf4672752c321ea36ce099cebdd7a082a8f327505 (patch)
tree459221740c16bf47bf83b55c0c1c91356aeb78a8 /arch/arm64/kvm
parentb990a9d3152bddca62cc1f8bf80518430b98737b (diff)
downloadlinux-f4672752c321ea36ce099cebdd7a082a8f327505.tar.gz
arm64: KVM: virtual CPU reset
Provide the reset code for a virtual CPU booted in 64bit mode. Reviewed-by: Christopher Covington <cov@codeaurora.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm64/kvm')
-rw-r--r--arch/arm64/kvm/reset.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
new file mode 100644
index 000000000000..f6536a06231a
--- /dev/null
+++ b/arch/arm64/kvm/reset.c
@@ -0,0 +1,76 @@
+/*
+ * 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 <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),
+};
+
+int kvm_arch_dev_ioctl_check_extension(long ext)
+{
+ int r;
+
+ switch (ext) {
+ 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_regs *cpu_reset;
+
+ switch (vcpu->arch.target) {
+ default:
+ cpu_reset = &default_regs_reset;
+ break;
+ }
+
+ /* Reset core registers */
+ memcpy(vcpu_gp_regs(vcpu), cpu_reset, sizeof(*cpu_reset));
+
+ /* Reset system registers */
+ kvm_reset_sys_regs(vcpu);
+
+ return 0;
+}