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Commit 1b151ce4 authored by Paul Mackerras's avatar Paul Mackerras
Browse files

KVM: PPC: Book3S HV: Rename hpte_setup_done to mmu_ready 



This renames the kvm->arch.hpte_setup_done field to mmu_ready because
we will want to use it for radix guests too -- both for setting things
up before vcpu execution, and for excluding vcpus from executing while
MMU-related things get changed, such as in future switching the MMU
from radix to HPT mode or vice-versa.

This also moves the call to kvmppc_setup_partition_table() that was
done in kvmppc_hv_setup_htab_rma() for HPT guests, and the setting
of mmu_ready, into the caller in kvmppc_vcpu_run_hv().

Signed-off-by: default avatarPaul Mackerras <paulus@ozlabs.org>
parent 8dc6cca5

arch/powerpc/include/asm/kvm_host.h

+1 −1
Original line number Diff line number Diff line
@@ -276,7 +276,7 @@ struct kvm_arch { 
	int tlbie_lock;

	unsigned long lpcr;

	unsigned long vrma_slb_v;

	int hpte_setup_done;

	int mmu_ready;

	atomic_t vcpus_running;

	u32 online_vcores;

	atomic_t hpte_mod_interest;

arch/powerpc/kvm/book3s_64_mmu_hv.c

+18 −18
Original line number Diff line number Diff line
@@ -140,12 +140,12 @@ long kvmppc_alloc_reset_hpt(struct kvm *kvm, int order) 
		return -EINVAL;



	mutex_lock(&kvm->lock);

	if (kvm->arch.hpte_setup_done) {

		kvm->arch.hpte_setup_done = 0;

		/* order hpte_setup_done vs. vcpus_running */

	if (kvm->arch.mmu_ready) {

		kvm->arch.mmu_ready = 0;

		/* order mmu_ready vs. vcpus_running */

		smp_mb();

		if (atomic_read(&kvm->arch.vcpus_running)) {

			kvm->arch.hpte_setup_done = 1;

			kvm->arch.mmu_ready = 1;

			goto out;

		}

	}
@@ -1533,15 +1533,15 @@ long kvm_vm_ioctl_resize_hpt_commit(struct kvm *kvm, 


	/* This shouldn't be possible */

	ret = -EIO;

	if (WARN_ON(!kvm->arch.hpte_setup_done))

	if (WARN_ON(!kvm->arch.mmu_ready))

		goto out_no_hpt;



	/* Stop VCPUs from running while we mess with the HPT */

	kvm->arch.hpte_setup_done = 0;

	kvm->arch.mmu_ready = 0;

	smp_mb();



	/* Boot all CPUs out of the guest so they re-read

	 * hpte_setup_done */

	 * mmu_ready */

	on_each_cpu(resize_hpt_boot_vcpu, NULL, 1);



	ret = -ENXIO;
@@ -1564,7 +1564,7 @@ long kvm_vm_ioctl_resize_hpt_commit(struct kvm *kvm, 


out:

	/* Let VCPUs run again */

	kvm->arch.hpte_setup_done = 1;

	kvm->arch.mmu_ready = 1;

	smp_mb();

out_no_hpt:

	resize_hpt_release(kvm, resize);
@@ -1802,7 +1802,7 @@ static ssize_t kvm_htab_write(struct file *file, const char __user *buf, 
	unsigned long tmp[2];

	ssize_t nb;

	long int err, ret;

	int hpte_setup;

	int mmu_ready;



	if (!access_ok(VERIFY_READ, buf, count))

		return -EFAULT;
@@ -1811,13 +1811,13 @@ static ssize_t kvm_htab_write(struct file *file, const char __user *buf, 


	/* lock out vcpus from running while we're doing this */

	mutex_lock(&kvm->lock);

	hpte_setup = kvm->arch.hpte_setup_done;

	if (hpte_setup) {

		kvm->arch.hpte_setup_done = 0;	/* temporarily */

		/* order hpte_setup_done vs. vcpus_running */

	mmu_ready = kvm->arch.mmu_ready;

	if (mmu_ready) {

		kvm->arch.mmu_ready = 0;	/* temporarily */

		/* order mmu_ready vs. vcpus_running */

		smp_mb();

		if (atomic_read(&kvm->arch.vcpus_running)) {

			kvm->arch.hpte_setup_done = 1;

			kvm->arch.mmu_ready = 1;

			mutex_unlock(&kvm->lock);

			return -EBUSY;

		}
@@ -1870,7 +1870,7 @@ static ssize_t kvm_htab_write(struct file *file, const char __user *buf, 
				       "r=%lx\n", ret, i, v, r);

				goto out;

			}

			if (!hpte_setup && is_vrma_hpte(v)) {

			if (!mmu_ready && is_vrma_hpte(v)) {

				unsigned long psize = hpte_base_page_size(v, r);

				unsigned long senc = slb_pgsize_encoding(psize);

				unsigned long lpcr;
@@ -1879,7 +1879,7 @@ static ssize_t kvm_htab_write(struct file *file, const char __user *buf, 
					(VRMA_VSID << SLB_VSID_SHIFT_1T);

				lpcr = senc << (LPCR_VRMASD_SH - 4);

				kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD);

				hpte_setup = 1;

				mmu_ready = 1;

			}

			++i;

			hptp += 2;
@@ -1895,9 +1895,9 @@ static ssize_t kvm_htab_write(struct file *file, const char __user *buf, 
	}



 out:

	/* Order HPTE updates vs. hpte_setup_done */

	/* Order HPTE updates vs. mmu_ready */

	smp_wmb();

	kvm->arch.hpte_setup_done = hpte_setup;

	kvm->arch.mmu_ready = mmu_ready;

	mutex_unlock(&kvm->lock);



	if (err)

arch/powerpc/kvm/book3s_hv.c

+25 −14
Original line number Diff line number Diff line
@@ -115,6 +115,7 @@ MODULE_PARM_DESC(h_ipi_redirect, "Redirect H_IPI wakeup to a free host core"); 


static void kvmppc_end_cede(struct kvm_vcpu *vcpu);

static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu);

static void kvmppc_setup_partition_table(struct kvm *kvm);



static inline struct kvm_vcpu *next_runnable_thread(struct kvmppc_vcore *vc,

		int *ip)
@@ -3198,6 +3199,7 @@ static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu) 
	unsigned long ebb_regs[3] = {};	/* shut up GCC */

	unsigned long user_tar = 0;

	unsigned int user_vrsave;

	struct kvm *kvm;



	if (!vcpu->arch.sane) {

		run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
@@ -3235,13 +3237,25 @@ static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu) 
		return -EINTR;

	}



	atomic_inc(&vcpu->kvm->arch.vcpus_running);

	/* Order vcpus_running vs. hpte_setup_done, see kvmppc_alloc_reset_hpt */

	kvm = vcpu->kvm;

	atomic_inc(&kvm->arch.vcpus_running);

	/* Order vcpus_running vs. mmu_ready, see kvmppc_alloc_reset_hpt */

	smp_mb();



	/* On the first time here, set up HTAB and VRMA */

	if (!kvm_is_radix(vcpu->kvm) && !vcpu->kvm->arch.hpte_setup_done) {

	/* On the first time here, set up MMU if necessary */

	if (!vcpu->kvm->arch.mmu_ready) {

		mutex_lock(&kvm->lock);

		r = 0;

		if (!kvm->arch.mmu_ready) {

			if (!kvm_is_radix(vcpu->kvm))

				r = kvmppc_hv_setup_htab_rma(vcpu);

			if (!r) {

				if (cpu_has_feature(CPU_FTR_ARCH_300))

					kvmppc_setup_partition_table(kvm);

				kvm->arch.mmu_ready = 1;

			}

		}

		mutex_unlock(&kvm->lock);

		if (r)

			goto out;

	}
@@ -3530,6 +3544,10 @@ static void kvmppc_setup_partition_table(struct kvm *kvm) 
	mmu_partition_table_set_entry(kvm->arch.lpid, dw0, dw1);

}



/*

 * Set up HPT (hashed page table) and RMA (real-mode area).

 * Must be called with kvm->lock held.

 */

static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)

{

	int err = 0;
@@ -3541,10 +3559,6 @@ static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu) 
	unsigned long psize, porder;

	int srcu_idx;



	mutex_lock(&kvm->lock);

	if (kvm->arch.hpte_setup_done)

		goto out;	/* another vcpu beat us to it */



	/* Allocate hashed page table (if not done already) and reset it */

	if (!kvm->arch.hpt.virt) {

		int order = KVM_DEFAULT_HPT_ORDER;
@@ -3603,18 +3617,14 @@ static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu) 
		/* the -4 is to account for senc values starting at 0x10 */

		lpcr = senc << (LPCR_VRMASD_SH - 4);

		kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD);

	} else {

		kvmppc_setup_partition_table(kvm);

	}



	/* Order updates to kvm->arch.lpcr etc. vs. hpte_setup_done */

	/* Order updates to kvm->arch.lpcr etc. vs. mmu_ready */

	smp_wmb();

	kvm->arch.hpte_setup_done = 1;

	err = 0;

 out_srcu:

	srcu_read_unlock(&kvm->srcu, srcu_idx);

 out:

	mutex_unlock(&kvm->lock);

	return err;



 up_out:
@@ -3769,6 +3779,7 @@ static int kvmppc_core_init_vm_hv(struct kvm *kvm) 
	 */

	if (radix_enabled()) {

		kvm->arch.radix = 1;

		kvm->arch.mmu_ready = 1;

		lpcr &= ~LPCR_VPM1;

		lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR;

		ret = kvmppc_init_vm_radix(kvm);