From: marc.zyngier@arm.com (Marc Zyngier)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 24/30] arm64: KVM: 32bit GP register access
Date: Tue, 26 Mar 2013 17:01:19 +0000 [thread overview]
Message-ID: <1364317285-20937-25-git-send-email-marc.zyngier@arm.com> (raw)
In-Reply-To: <1364317285-20937-1-git-send-email-marc.zyngier@arm.com>
Allow access to the 32bit register file through the usual API.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
arch/arm64/include/asm/kvm_emulate.h | 17 +++-
arch/arm64/kvm/Makefile | 2 +-
arch/arm64/kvm/regmap.c | 168 +++++++++++++++++++++++++++++++++++
3 files changed, 184 insertions(+), 3 deletions(-)
create mode 100644 arch/arm64/kvm/regmap.c
diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index 80128cd..3c42f0c38 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -28,6 +28,9 @@
#include <asm/kvm_mmio.h>
#include <asm/ptrace.h>
+unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num);
+unsigned long *vcpu_spsr32(const struct kvm_vcpu *vcpu);
+
void kvm_inject_undefined(struct kvm_vcpu *vcpu);
void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
@@ -49,7 +52,7 @@ static inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu)
static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu)
{
- return false; /* 32bit? Bahhh... */
+ return !!(*vcpu_cpsr(vcpu) & PSR_MODE32_BIT);
}
static inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu)
@@ -64,28 +67,38 @@ static inline void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr)
static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
{
+ *vcpu_cpsr(vcpu) |= COMPAT_PSR_T_BIT;
}
static inline unsigned long *vcpu_reg(const struct kvm_vcpu *vcpu, u8 reg_num)
{
+ if (vcpu_mode_is_32bit(vcpu))
+ return vcpu_reg32(vcpu, reg_num);
+
return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.regs[reg_num];
}
/* Get vcpu SPSR for current mode */
static inline unsigned long *vcpu_spsr(const struct kvm_vcpu *vcpu)
{
+ if (vcpu_mode_is_32bit(vcpu))
+ return vcpu_spsr32(vcpu);
+
return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1];
}
static inline bool kvm_vcpu_reg_is_pc(const struct kvm_vcpu *vcpu, int reg)
{
- return false;
+ return (vcpu_mode_is_32bit(vcpu)) && reg == 15;
}
static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu)
{
u32 mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK;
+ if (vcpu_mode_is_32bit(vcpu))
+ return mode > COMPAT_PSR_MODE_USR;
+
return mode != PSR_MODE_EL0t;
}
diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile
index b2ce0a7..e9c911f 100644
--- a/arch/arm64/kvm/Makefile
+++ b/arch/arm64/kvm/Makefile
@@ -10,7 +10,7 @@ obj-$(CONFIG_KVM_ARM_HOST) += $(addprefix ../../../virt/kvm/, kvm_main.o coalesc
obj-$(CONFIG_KVM_ARM_HOST) += $(addprefix ../../../arch/arm/kvm/, arm.o mmu.o mmio.o psci.o perf.o)
-obj-$(CONFIG_KVM_ARM_HOST) += inject_fault.o
+obj-$(CONFIG_KVM_ARM_HOST) += inject_fault.o regmap.o
obj-$(CONFIG_KVM_ARM_HOST) += hyp.o hyp-init.o handle_exit.o idmap.o
obj-$(CONFIG_KVM_ARM_HOST) += guest.o reset.o sys_regs.o sys_regs_generic_v8.o
diff --git a/arch/arm64/kvm/regmap.c b/arch/arm64/kvm/regmap.c
new file mode 100644
index 0000000..9a6d2a5
--- /dev/null
+++ b/arch/arm64/kvm/regmap.c
@@ -0,0 +1,168 @@
+/*
+ * Copyright (C) 2012 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * Derived from arch/arm/kvm/emulate.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/mm.h>
+#include <linux/kvm_host.h>
+#include <asm/kvm_emulate.h>
+#include <asm/ptrace.h>
+
+#define VCPU_NR_MODES 6
+#define REG_OFFSET(_reg) \
+ (offsetof(struct user_pt_regs, _reg) / sizeof(unsigned long))
+
+#define USR_REG_OFFSET(R) REG_OFFSET(compat_usr(R))
+
+static const unsigned long vcpu_reg_offsets[VCPU_NR_MODES][16] = {
+ /* USR Registers */
+ {
+ USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
+ USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
+ USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
+ USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
+ USR_REG_OFFSET(12), USR_REG_OFFSET(13), USR_REG_OFFSET(14),
+ REG_OFFSET(pc)
+ },
+
+ /* FIQ Registers */
+ {
+ USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
+ USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
+ USR_REG_OFFSET(6), USR_REG_OFFSET(7),
+ REG_OFFSET(compat_r8_fiq), /* r8 */
+ REG_OFFSET(compat_r9_fiq), /* r9 */
+ REG_OFFSET(compat_r10_fiq), /* r10 */
+ REG_OFFSET(compat_r11_fiq), /* r11 */
+ REG_OFFSET(compat_r12_fiq), /* r12 */
+ REG_OFFSET(compat_sp_fiq), /* r13 */
+ REG_OFFSET(compat_lr_fiq), /* r14 */
+ REG_OFFSET(pc)
+ },
+
+ /* IRQ Registers */
+ {
+ USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
+ USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
+ USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
+ USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
+ USR_REG_OFFSET(12),
+ REG_OFFSET(compat_sp_irq), /* r13 */
+ REG_OFFSET(compat_lr_irq), /* r14 */
+ REG_OFFSET(pc)
+ },
+
+ /* SVC Registers */
+ {
+ USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
+ USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
+ USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
+ USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
+ USR_REG_OFFSET(12),
+ REG_OFFSET(compat_sp_svc), /* r13 */
+ REG_OFFSET(compat_lr_svc), /* r14 */
+ REG_OFFSET(pc)
+ },
+
+ /* ABT Registers */
+ {
+ USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
+ USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
+ USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
+ USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
+ USR_REG_OFFSET(12),
+ REG_OFFSET(compat_sp_abt), /* r13 */
+ REG_OFFSET(compat_lr_abt), /* r14 */
+ REG_OFFSET(pc)
+ },
+
+ /* UND Registers */
+ {
+ USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
+ USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
+ USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
+ USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
+ USR_REG_OFFSET(12),
+ REG_OFFSET(compat_sp_und), /* r13 */
+ REG_OFFSET(compat_lr_und), /* r14 */
+ REG_OFFSET(pc)
+ },
+};
+
+/*
+ * Return a pointer to the register number valid in the current mode of
+ * the virtual CPU.
+ */
+unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num)
+{
+ unsigned long *reg_array = (unsigned long *)&vcpu->arch.ctxt.gp_regs.regs;
+ unsigned long mode = *vcpu_cpsr(vcpu) & COMPAT_PSR_MODE_MASK;
+
+ switch (mode) {
+ case COMPAT_PSR_MODE_USR ... COMPAT_PSR_MODE_SVC:
+ mode &= ~PSR_MODE32_BIT; /* 0 ... 3 */
+ break;
+
+ case COMPAT_PSR_MODE_ABT:
+ mode = 4;
+ break;
+
+ case COMPAT_PSR_MODE_UND:
+ mode = 5;
+ break;
+
+ case COMPAT_PSR_MODE_SYS:
+ mode = 0; /* SYS maps to USR */
+ break;
+
+ default:
+ BUG();
+ }
+
+ return reg_array + vcpu_reg_offsets[mode][reg_num];
+}
+
+/*
+ * Return the SPSR for the current mode of the virtual CPU.
+ */
+unsigned long *vcpu_spsr32(const struct kvm_vcpu *vcpu)
+{
+ unsigned long mode = *vcpu_cpsr(vcpu) & COMPAT_PSR_MODE_MASK;
+ switch (mode) {
+ case COMPAT_PSR_MODE_SVC:
+ mode = KVM_SPSR_SVC;
+ break;
+ case COMPAT_PSR_MODE_ABT:
+ mode = KVM_SPSR_ABT;
+ break;
+ case COMPAT_PSR_MODE_UND:
+ mode = KVM_SPSR_UND;
+ break;
+ case COMPAT_PSR_MODE_IRQ:
+ mode = KVM_SPSR_IRQ;
+ break;
+ case COMPAT_PSR_MODE_FIQ:
+ mode = KVM_SPSR_FIQ;
+ break;
+ default:
+ BUG();
+ }
+
+ return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[mode];
+}
--
1.8.1.4
next prev parent reply other threads:[~2013-03-26 17:01 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-26 17:00 [PATCH v2 00/30] Port of KVM to arm64 Marc Zyngier
2013-03-26 17:00 ` [PATCH v2 01/30] arm64: add explicit symbols to ESR_EL1 decoding Marc Zyngier
2013-03-27 13:51 ` Catalin Marinas
2013-03-27 14:05 ` Marc Zyngier
2013-03-26 17:00 ` [PATCH v2 02/30] arm64: KVM: define HYP and Stage-2 translation page flags Marc Zyngier
2013-03-27 14:11 ` Catalin Marinas
2013-03-27 14:20 ` Marc Zyngier
2013-03-26 17:00 ` [PATCH v2 03/30] arm64: KVM: HYP mode idmap support Marc Zyngier
2013-03-26 17:00 ` [PATCH v2 04/30] arm64: KVM: EL2 register definitions Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 05/30] arm64: KVM: system register definitions for 64bit guests Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 06/30] arm64: KVM: Basic ESR_EL2 helpers and vcpu register access Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 07/30] arm64: KVM: fault injection into a guest Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 08/30] arm64: KVM: architecture specific MMU backend Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 09/30] arm64: KVM: user space interface Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 10/30] arm64: KVM: system register handling Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 11/30] arm64: KVM: CPU specific system registers handling Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 12/30] arm64: KVM: virtual CPU reset Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 13/30] arm64: KVM: kvm_arch and kvm_vcpu_arch definitions Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 14/30] arm64: KVM: MMIO access backend Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 15/30] arm64: KVM: guest one-reg interface Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 16/30] arm64: KVM: hypervisor initialization code Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 17/30] arm64: KVM: HYP mode world switch implementation Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 18/30] arm64: KVM: Exit handling Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 19/30] arm64: KVM: Plug the VGIC Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 20/30] arm64: KVM: Plug the arch timer Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 21/30] arm64: KVM: PSCI implementation Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 22/30] arm64: KVM: Build system integration Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 23/30] arm64: KVM: define 32bit specific registers Marc Zyngier
2013-03-26 17:01 ` Marc Zyngier [this message]
2013-03-26 17:01 ` [PATCH v2 25/30] arm64: KVM: 32bit conditional execution emulation Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 26/30] arm64: KVM: 32bit handling of coprocessor traps Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 27/30] arm64: KVM: CPU specific 32bit coprocessor access Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 28/30] arm64: KVM: 32bit specific register world switch Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 29/30] arm64: KVM: 32bit guest fault injection Marc Zyngier
2013-03-26 17:01 ` [PATCH v2 30/30] arm64: KVM: enable initialization of a 32bit vcpu Marc Zyngier
2013-03-29 14:57 ` [PATCH v2 00/30] Port of KVM to arm64 Christopher Covington
2013-03-29 18:37 ` Marc Zyngier
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