linux-kernel - [RFC PATCH v2 09/38] KVM: arm64: Add the shadow context for virtual EL2 execution

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Date:   Tue, 18 Jul 2017 11:58:35 -0500
From:   Jintack Lim <jintack.lim@...aro.org>
To:     kvmarm@...ts.cs.columbia.edu, christoffer.dall@...aro.org,
        marc.zyngier@....com
Cc:     corbet@....net, pbonzini@...hat.com, rkrcmar@...hat.com,
        linux@...linux.org.uk, catalin.marinas@....com,
        will.deacon@....com, akpm@...ux-foundation.org, mchehab@...nel.org,
        cov@...eaurora.org, daniel.lezcano@...aro.org,
        david.daney@...ium.com, mark.rutland@....com,
        suzuki.poulose@....com, stefan@...lo-penguin.com,
        andy.gross@...aro.org, wcohen@...hat.com,
        ard.biesheuvel@...aro.org, shankerd@...eaurora.org,
        vladimir.murzin@....com, james.morse@....com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Jintack Lim <jintack.lim@...aro.org>
Subject: [RFC PATCH v2 09/38] KVM: arm64: Add the shadow context for virtual EL2 execution

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

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;
-- 
1.9.1