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[RFC,v2,09/38] KVM: arm64: Add the shadow context for virtual EL2 execution

Message ID 1500397144-16232-10-git-send-email-jintack.lim@linaro.org
State New
Headers show
Series Nested Virtualization on KVM/ARM | expand

Commit Message

Jintack Lim July 18, 2017, 4:58 p.m. UTC 
With the nested virtualization support, a hypervisor running inside a VM
(i.e. a guest hypervisor) is now deprivilaged and runs in EL1 instead of
EL2. So, the host hypervisor manages the shadow context for the virtual
EL2 execution.

Signed-off-by: Jintack Lim <jintack.lim@linaro.org>

---
 arch/arm64/include/asm/kvm_host.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

-- 
1.9.1
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Patch

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 57dccde..46880c3 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -229,6 +229,19 @@  struct kvm_cpu_context {
 	};
 
 	u64 el2_special_regs[NR_EL2_SPECIAL_REGS];
+
+	u64 shadow_sys_regs[NR_SYS_REGS];  /* only used for virtual EL2 */
+
+	/*
+	 * hw_* will be written to the hardware when entering to a VM.
+	 * They have either the virtual EL2 or EL1/EL0 context depending
+	 * on the vcpu mode.
+	 */
+	u64 *hw_sys_regs;
+	u64 hw_sp_el1;
+	u64 hw_pstate;
+	u64 hw_elr_el1;
+	u64 hw_spsr_el1;
 };
 
 typedef struct kvm_cpu_context kvm_cpu_context_t;