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From: Andrew Scull <ascull@google.com>
To: kvmarm@lists.cs.columbia.edu
Cc: maz@kernel.org, kernel-team@android.com
Subject: [PATCH 07/37] KVM: arm64: Separate SError detection from VAXorcism
Date: Wed, 15 Jul 2020 19:44:08 +0100
Message-ID: <20200715184438.1390996-8-ascull@google.com> (raw)
In-Reply-To: <20200715184438.1390996-1-ascull@google.com>

When exiting a guest, just check whether there is an SError pending and
set the bit in the exit code. The fixup then initiates the ceremony
should it be required.

The separation allows for easier choices to be made as to whether the
demonic consultation should proceed.

Signed-off-by: Andrew Scull <ascull@google.com>
---
 arch/arm64/include/asm/kvm_hyp.h        |  2 ++
 arch/arm64/kvm/hyp/entry.S              | 27 +++++++++++++++++--------
 arch/arm64/kvm/hyp/hyp-entry.S          |  1 -
 arch/arm64/kvm/hyp/include/hyp/switch.h |  4 ++++
 4 files changed, 25 insertions(+), 9 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h
index 07745d9c49fc..50a774812761 100644
--- a/arch/arm64/include/asm/kvm_hyp.h
+++ b/arch/arm64/include/asm/kvm_hyp.h
@@ -91,6 +91,8 @@ void deactivate_traps_vhe_put(void);
 
 u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt);
 
+void __vaxorcize_serror(void);
+
 void __noreturn hyp_panic(struct kvm_cpu_context *host_ctxt);
 #ifdef __KVM_NVHE_HYPERVISOR__
 void __noreturn __hyp_do_panic(unsigned long, ...);
diff --git a/arch/arm64/kvm/hyp/entry.S b/arch/arm64/kvm/hyp/entry.S
index 6a641fcff4f7..dc4e3e7e7407 100644
--- a/arch/arm64/kvm/hyp/entry.S
+++ b/arch/arm64/kvm/hyp/entry.S
@@ -174,18 +174,31 @@ alternative_if ARM64_HAS_RAS_EXTN
 	mrs_s	x2, SYS_DISR_EL1
 	str	x2, [x1, #(VCPU_FAULT_DISR - VCPU_CONTEXT)]
 	cbz	x2, 1f
-	msr_s	SYS_DISR_EL1, xzr
 	orr	x0, x0, #(1<<ARM_EXIT_WITH_SERROR_BIT)
-1:	ret
+	nop
+1:
 alternative_else
 	dsb	sy		// Synchronize against in-flight ld/st
 	isb			// Prevent an early read of side-effect free ISR
 	mrs	x2, isr_el1
-	tbnz	x2, #8, 2f	// ISR_EL1.A
-	ret
-	nop
+	tbz	x2, #8, 2f	// ISR_EL1.A
+	orr	x0, x0, #(1<<ARM_EXIT_WITH_SERROR_BIT)
 2:
 alternative_endif
+
+	ret
+SYM_FUNC_END(__guest_enter)
+
+/*
+ * void __vaxorcize_serror(void);
+ */
+SYM_FUNC_START(__vaxorcize_serror)
+
+alternative_if ARM64_HAS_RAS_EXTN
+	msr_s	SYS_DISR_EL1, xzr
+	ret
+alternative_else_nop_endif
+
 	// We know we have a pending asynchronous abort, now is the
 	// time to flush it out. From your VAXorcist book, page 666:
 	// "Threaten me not, oh Evil one!  For I speak with
@@ -193,7 +206,6 @@ alternative_endif
 	mrs	x2, elr_el2
 	mrs	x3, esr_el2
 	mrs	x4, spsr_el2
-	mov	x5, x0
 
 	msr	daifclr, #4	// Unmask aborts
 
@@ -217,6 +229,5 @@ abort_guest_exit_end:
 	msr	elr_el2, x2
 	msr	esr_el2, x3
 	msr	spsr_el2, x4
-	orr	x0, x0, x5
 1:	ret
-SYM_FUNC_END(__guest_enter)
+SYM_FUNC_END(__vaxorcize_serror)
diff --git a/arch/arm64/kvm/hyp/hyp-entry.S b/arch/arm64/kvm/hyp/hyp-entry.S
index e727bee8e110..c441aabb8ab0 100644
--- a/arch/arm64/kvm/hyp/hyp-entry.S
+++ b/arch/arm64/kvm/hyp/hyp-entry.S
@@ -177,7 +177,6 @@ el2_error:
 	adr	x1, abort_guest_exit_end
 	ccmp	x0, x1, #4, ne
 	b.ne	__hyp_panic
-	mov	x0, #(1 << ARM_EXIT_WITH_SERROR_BIT)
 	eret
 	sb
 
diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h
index 0511af14dc81..14a774d1a35a 100644
--- a/arch/arm64/kvm/hyp/include/hyp/switch.h
+++ b/arch/arm64/kvm/hyp/include/hyp/switch.h
@@ -405,6 +405,10 @@ static inline bool __hyp_handle_ptrauth(struct kvm_vcpu *vcpu)
  */
 static inline bool fixup_guest_exit(struct kvm_vcpu *vcpu, u64 *exit_code)
 {
+	/* Flush guest SErrors. */
+	if (ARM_SERROR_PENDING(*exit_code))
+		__vaxorcize_serror();
+
 	if (ARM_EXCEPTION_CODE(*exit_code) != ARM_EXCEPTION_IRQ)
 		vcpu->arch.fault.esr_el2 = read_sysreg_el2(SYS_ESR);
 
-- 
2.27.0.389.gc38d7665816-goog

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  parent reply index

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-15 18:44 [PATCH 00/37] Transform the host into a vCPU Andrew Scull
2020-07-15 18:44 ` [PATCH 01/37] smccc: Make constants available to assembly Andrew Scull
2020-07-15 18:44 ` [PATCH 02/37] KVM: arm64: Move clearing of vcpu debug dirty bit Andrew Scull
2020-07-15 18:44 ` [PATCH 03/37] KVM: arm64: Track running vCPU outside of the CPU context Andrew Scull
2020-07-15 18:44 ` [PATCH 04/37] KVM: arm64: nVHE: Pass pointers consistently to hyp-init Andrew Scull
2020-07-15 18:44 ` [PATCH 05/37] KVM: arm64: nVHE: Break out of the hyp-init idmap Andrew Scull
2020-07-15 18:44 ` [PATCH 06/37] KVM: arm64: Only check pending interrupts if it would trap Andrew Scull
2020-07-17 16:21   ` Marc Zyngier
2020-07-15 18:44 ` Andrew Scull [this message]
2020-07-18  9:00   ` [PATCH 07/37] KVM: arm64: Separate SError detection from VAXorcism Marc Zyngier
2020-07-20 14:13     ` Andrew Scull
2020-07-20 14:56       ` Marc Zyngier
2020-07-23  0:59         ` FW: " Renters Cancellation Requests
2020-07-20 15:40   ` Andrew Scull
2020-07-20 15:57     ` Marc Zyngier
2020-07-15 18:44 ` [PATCH 08/37] KVM: arm64: nVHE: Introduce a hyp run loop for the host Andrew Scull
2020-07-15 18:44 ` [PATCH 09/37] smccc: Cast arguments to unsigned long Andrew Scull
2020-07-15 18:44 ` [PATCH 10/37] KVM: arm64: nVHE: Migrate hyp interface to SMCCC Andrew Scull
2020-07-15 18:44 ` [PATCH 11/37] KVM: arm64: nVHE: Migrate hyp-init " Andrew Scull
2020-07-15 18:44 ` [PATCH 12/37] KVM: arm64: nVHE: Fix pointers during SMCCC convertion Andrew Scull
2020-07-15 18:44 ` [PATCH 13/37] KVM: arm64: Rename workaround 2 helpers Andrew Scull
2020-07-15 18:44 ` [PATCH 14/37] KVM: arm64: nVHE: Use __kvm_vcpu_run for the host vcpu Andrew Scull
2020-07-15 18:44 ` [PATCH 15/37] KVM: arm64: Share some context save and restore macros Andrew Scull
2020-07-15 18:44 ` [PATCH 16/37] KVM: arm64: nVHE: Handle stub HVCs in the host loop Andrew Scull
2020-07-15 18:44 ` [PATCH 17/37] KVM: arm64: nVHE: Store host sysregs in host vcpu Andrew Scull
2020-07-15 18:44 ` [PATCH 18/37] KVM: arm64: nVHE: Access pmu_events directly in kvm_host_data Andrew Scull
2020-07-15 18:44 ` [PATCH 19/37] KVM: arm64: nVHE: Drop host_ctxt argument for context switching Andrew Scull
2020-07-15 18:44 ` [PATCH 20/37] KVM: arm64: nVHE: Use host vcpu context for host debug state Andrew Scull
2020-07-15 18:44 ` [PATCH 21/37] KVM: arm64: Move host debug state from vcpu to percpu Andrew Scull
2020-07-15 18:44 ` [PATCH 22/37] KVM: arm64: nVHE: Store host's mdcr_el2 and hcr_el2 in its vcpu Andrew Scull
2020-07-15 18:44 ` [PATCH 23/37] KVM: arm64: Skip __hyp_panic and go direct to hyp_panic Andrew Scull
2020-07-15 18:44 ` [PATCH 24/37] KVM: arm64: Break apart kvm_host_data Andrew Scull
2020-07-15 18:44 ` [PATCH 25/37] KVM: arm64: nVHE: Unify sysreg state saving paths Andrew Scull
2020-07-15 18:44 ` [PATCH 26/37] KVM: arm64: nVHE: Unify 32-bit sysreg " Andrew Scull
2020-07-15 18:44 ` [PATCH 27/37] KVM: arm64: nVHE: Unify vgic save and restore Andrew Scull
2020-07-15 18:44 ` [PATCH 28/37] KVM: arm64: nVHE: Unify fpexc32 saving paths Andrew Scull
2020-07-15 18:44 ` [PATCH 29/37] KVM: arm64: nVHE: Separate the save and restore of debug state Andrew Scull
2020-07-15 18:44 ` [PATCH 30/37] KVM: arm64: nVHE: Remove MMU assumption in speculative AT workaround Andrew Scull
2020-07-15 18:44 ` [PATCH 31/37] KVM: arm64: Move speculative AT ISBs into context Andrew Scull
2020-07-15 18:44 ` [PATCH 32/37] KVM: arm64: nVHE: Unify sysreg state restoration paths Andrew Scull
2020-07-15 18:44 ` [PATCH 33/37] KVM: arm64: Remove __activate_vm wrapper Andrew Scull
2020-07-15 18:44 ` [PATCH 34/37] KVM: arm64: nVHE: Unify timer restore paths Andrew Scull
2020-07-15 18:44 ` [PATCH 35/37] KVM: arm64: nVHE: Unify PMU event restoration paths Andrew Scull
2020-07-15 18:44 ` [PATCH 36/37] KVM: arm64: nVHE: Unify GIC PMR " Andrew Scull
2020-07-15 18:44 ` [PATCH 37/37] KVM: arm64: Separate save and restore of vcpu trap state Andrew Scull

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