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FAILED: patch "[PATCH] KVM: arm64: Fix nVHE hyp panic host context restore" failed to apply to 5.11-stable tree

PATCH [email protected] 1 participant 1 message Mar 15, 2021

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The patch below does not apply to the 5.11-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From c4b000c3928d4f20acef79dccf3a65ae3795e0b0 Mon Sep 17 00:00:00 2001
From: Andrew Scull <[email protected]>
Date: Fri, 5 Mar 2021 18:52:49 +0000
Subject: [PATCH] KVM: arm64: Fix nVHE hyp panic host context restore

When panicking from the nVHE hyp and restoring the host context, x29 is expected to hold a pointer to the host context. This wasn't being done so fix it to make sure there's a valid pointer the host context being used.

Rather than passing a boolean indicating whether or not the host context should be restored, instead pass the pointer to the host context. NULL is passed to indicate that no context should be restored.

Fixes a2e102e20fd6 ("KVM: arm64: nVHE: Handle hyp panics")
Cc [email protected]
Signed-off-by Andrew Scull <[email protected]>
[maz: partial rewrite to fit 5.12-rc1]
Signed-off-by Marc Zyngier <[email protected]>
Link https://lore.kernel.org/r/[email protected] open here

Message-Id: <[email protected]>

Signed-off-by Paolo Bonzini <[email protected]>
arch/arm64/include/asm/kvm_hyp.h +2 -1
index 385bd7dd3d39..32ae676236b6 100644
@@ -102,7 +102,8 @@ bool kvm_host_psci_handler(struct kvm_cpu_context *host_ctxt);
 
 void __noreturn hyp_panic(void);
 #ifdef __KVM_NVHE_HYPERVISOR__
-void __noreturn __hyp_do_panic(bool restore_host, u64 spsr, u64 elr, u64 par);
+void __noreturn __hyp_do_panic(struct kvm_cpu_context *host_ctxt, u64 spsr,
+			       u64 elr, u64 par);
 #endif
 
 #endif /* __ARM64_KVM_HYP_H__ */
arch/arm64/kvm/hyp/nvhe/host.S +8 -7
index 6585a7cbbc56..5d94584840cc 100644
@@ -71,7 +71,8 @@ SYM_FUNC_START(__host_enter)
 SYM_FUNC_END(__host_enter)
 
 /*
- * void __noreturn __hyp_do_panic(bool restore_host, u64 spsr, u64 elr, u64 par);
+ * void __noreturn __hyp_do_panic(struct kvm_cpu_context *host_ctxt, u64 spsr,
+ * 				  u64 elr, u64 par);
  */
 SYM_FUNC_START(__hyp_do_panic)
 	/* Prepare and exit to the host's panic funciton. */

@@ -82,9 +83,11 @@ SYM_FUNC_START(__hyp_do_panic)
 	hyp_kimg_va lr, x6
 	msr	elr_el2, lr
 
-	/* Set the panic format string. Use the, now free, LR as scratch. */
-	ldr	lr, =__hyp_panic_string
-	hyp_kimg_va lr, x6
+	mov	x29, x0
+
+	/* Load the format string into x0 and arguments into x1-7 */
+	ldr	x0, =__hyp_panic_string
+	hyp_kimg_va x0, x6
 
 	/* Load the format arguments into x1-7. */
 	mov	x6, x3

@@ -94,9 +97,7 @@ SYM_FUNC_START(__hyp_do_panic)
 	mrs	x5, hpfar_el2
 
 	/* Enter the host, conditionally restoring the host context. */
-	cmp	x0, xzr
-	mov	x0, lr
-	b.eq	__host_enter_without_restoring
+	cbz	x29, __host_enter_without_restoring
 	b	__host_enter_for_panic
 SYM_FUNC_END(__hyp_do_panic)
arch/arm64/kvm/hyp/nvhe/switch.c +1 -2
index 59aa1045fdaf..68ab6b4d5141 100644
@@ -266,7 +266,6 @@ void __noreturn hyp_panic(void)
 	u64 spsr = read_sysreg_el2(SYS_SPSR);
 	u64 elr = read_sysreg_el2(SYS_ELR);
 	u64 par = read_sysreg_par();
-	bool restore_host = true;
 	struct kvm_cpu_context *host_ctxt;
 	struct kvm_vcpu *vcpu;
 

@@ -280,7 +279,7 @@ void __noreturn hyp_panic(void)
 		__sysreg_restore_state_nvhe(host_ctxt);
 	}
 
-	__hyp_do_panic(restore_host, spsr, elr, par);
+	__hyp_do_panic(host_ctxt, spsr, elr, par);
 	unreachable();
 }