linux-kernel - [PATCH 4.9 055/310] KVM: arm: Restore banked registers and physical timer access on hyp

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Date:   Wed, 11 Apr 2018 20:33:14 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, James Morse <james.morse@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        Christoffer Dall <cdall@...aro.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 055/310] KVM: arm: Restore banked registers and physical timer access on hyp_panic()

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: James Morse <james.morse@....com>


[ Upstream commit d2e19368848ce6065daa785efca26faed54732b6 ]

When KVM panics, it hurridly restores the host context and parachutes
into the host's panic() code. This looks like it was copied from arm64,
the 32bit KVM panic code needs to restore the host's banked registers
too.

At some point panic() touches the physical timer/counter, this will
trap back to HYP. If we're lucky, we panic again.

Add a __timer_save_state() call to KVMs hyp_panic() path, this saves the
guest registers and disables the traps for the host.

Fixes: c36b6db5f3e4 ("ARM: KVM: Add panic handling code")
Signed-off-by: James Morse <james.morse@....com>
Reviewed-by: Marc Zyngier <marc.zyngier@....com>
Reviewed-by: Christoffer Dall <cdall@...aro.org>
Signed-off-by: Christoffer Dall <cdall@...aro.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arm/kvm/hyp/switch.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/arm/kvm/hyp/switch.c
+++ b/arch/arm/kvm/hyp/switch.c
@@ -237,8 +237,10 @@ void __hyp_text __noreturn __hyp_panic(i
 
 		vcpu = (struct kvm_vcpu *)read_sysreg(HTPIDR);
 		host_ctxt = kern_hyp_va(vcpu->arch.host_cpu_context);
+		__timer_save_state(vcpu);
 		__deactivate_traps(vcpu);
 		__deactivate_vm(vcpu);
+		__banked_restore_state(host_ctxt);
 		__sysreg_restore_state(host_ctxt);
 	}