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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 36/37] KVM: arm64: nVHE: Unify GIC PMR restoration paths
Date: Wed, 15 Jul 2020 19:44:37 +0100
Message-ID: <20200715184438.1390996-37-ascull@google.com> (raw)
In-Reply-To: <20200715184438.1390996-1-ascull@google.com>

Different actions are taken depending on whether the vcpu is the host or
not.

Signed-off-by: Andrew Scull <ascull@google.com>
---
 arch/arm64/kvm/hyp/nvhe/switch.c | 50 ++++++++++++++------------------
 1 file changed, 22 insertions(+), 28 deletions(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/switch.c b/arch/arm64/kvm/hyp/nvhe/switch.c
index d37386b8ded8..260c5cbb6717 100644
--- a/arch/arm64/kvm/hyp/nvhe/switch.c
+++ b/arch/arm64/kvm/hyp/nvhe/switch.c
@@ -88,6 +88,26 @@ static void __hyp_vgic_restore_state(struct kvm_vcpu *vcpu)
 	}
 }
 
+void __hyp_gic_pmr_restore(struct kvm_vcpu *vcpu)
+{
+	if (!system_uses_irq_prio_masking())
+		return;
+
+	if (vcpu->arch.ctxt.is_host) {
+		/* Returning to host will clear PSR.I, remask PMR if needed */
+		gic_write_pmr(GIC_PRIO_IRQOFF);
+	} else {
+		/*
+		 * Having IRQs masked via PMR when entering the guest means the
+		 * GIC will not signal the CPU of interrupts of lower priority,
+		 * and the only way to get out will be via guest exceptions.
+		 * Naturally, we want to avoid this.
+		 */
+		gic_write_pmr(GIC_PRIO_IRQON | GIC_PRIO_PSR_I_SET);
+		pmr_sync();
+	}
+}
+
 static void __pmu_restore(struct kvm_vcpu *vcpu)
 {
 	struct kvm_pmu_events *pmu = __hyp_this_cpu_ptr(kvm_pmu_events);
@@ -106,29 +126,6 @@ static void __pmu_restore(struct kvm_vcpu *vcpu)
 	write_sysreg(set, pmcntenset_el0);
 }
 
-static void __kvm_vcpu_switch_to_guest(struct kvm_vcpu *host_vcpu,
-				       struct kvm_vcpu *vcpu)
-{
-	/*
-	 * Having IRQs masked via PMR when entering the guest means the GIC
-	 * will not signal the CPU of interrupts of lower priority, and the
-	 * only way to get out will be via guest exceptions.
-	 * Naturally, we want to avoid this.
-	 */
-	if (system_uses_irq_prio_masking()) {
-		gic_write_pmr(GIC_PRIO_IRQON | GIC_PRIO_PSR_I_SET);
-		pmr_sync();
-	}
-}
-
-static void __kvm_vcpu_switch_to_host(struct kvm_vcpu *host_vcpu,
-				      struct kvm_vcpu *vcpu)
-{
-	/* Returning to host will clear PSR.I, remask PMR if needed */
-	if (system_uses_irq_prio_masking())
-		gic_write_pmr(GIC_PRIO_IRQOFF);
-}
-
 static void __vcpu_save_state(struct kvm_vcpu *vcpu, bool save_debug)
 {
 	__sysreg_save_state_nvhe(&vcpu->arch.ctxt);
@@ -154,11 +151,6 @@ static void __vcpu_restore_state(struct kvm_vcpu *vcpu, bool restore_debug)
 	 */
 	running_vcpu = __hyp_this_cpu_read(kvm_hyp_running_vcpu);
 
-	if (vcpu->arch.ctxt.is_host)
-		__kvm_vcpu_switch_to_host(vcpu, running_vcpu);
-	else
-		__kvm_vcpu_switch_to_guest(running_vcpu, vcpu);
-
 	if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) {
 		u64 val;
 
@@ -207,6 +199,8 @@ static void __vcpu_restore_state(struct kvm_vcpu *vcpu, bool restore_debug)
 
 	__pmu_restore(vcpu);
 
+	__hyp_gic_pmr_restore(vcpu);
+
 	*__hyp_this_cpu_ptr(kvm_hyp_running_vcpu) = vcpu;
 }
 
-- 
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 ` [PATCH 07/37] KVM: arm64: Separate SError detection from VAXorcism Andrew Scull
2020-07-18  9:00   ` 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 ` Andrew Scull [this message]
2020-07-15 18:44 ` [PATCH 37/37] KVM: arm64: Separate save and restore of vcpu trap state Andrew Scull

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