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From: Janosch Frank <frankja@linux.ibm.com>
To: kvm@vger.kernel.org
Cc: linux-s390@vger.kernel.org, thuth@redhat.com, david@redhat.com,
	borntraeger@de.ibm.com, imbrenda@linux.ibm.com,
	mihajlov@linux.ibm.com, mimu@linux.ibm.com, cohuck@redhat.com,
	gor@linux.ibm.com, frankja@linux.ibm.com
Subject: [RFC 09/37] KVM: s390: protvirt: Implement on-demand pinning
Date: Thu, 24 Oct 2019 07:40:31 -0400	[thread overview]
Message-ID: <20191024114059.102802-10-frankja@linux.ibm.com> (raw)
In-Reply-To: <20191024114059.102802-1-frankja@linux.ibm.com>

From: Claudio Imbrenda <imbrenda@linux.ibm.com>

Pin the guest pages when they are first accessed, instead of all at
the same time when starting the guest.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
---
 arch/s390/include/asm/gmap.h |  1 +
 arch/s390/include/asm/uv.h   |  6 +++++
 arch/s390/kernel/uv.c        | 20 ++++++++++++++
 arch/s390/kvm/kvm-s390.c     |  2 ++
 arch/s390/kvm/pv.c           | 51 ++++++++++++++++++++++++++++++------
 5 files changed, 72 insertions(+), 8 deletions(-)

diff --git a/arch/s390/include/asm/gmap.h b/arch/s390/include/asm/gmap.h
index 99b3eedda26e..483f64427c0e 100644
--- a/arch/s390/include/asm/gmap.h
+++ b/arch/s390/include/asm/gmap.h
@@ -63,6 +63,7 @@ struct gmap {
 	struct gmap *parent;
 	unsigned long orig_asce;
 	unsigned long se_handle;
+	struct page **pinned_pages;
 	int edat_level;
 	bool removed;
 	bool initialized;
diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h
index 99cdd2034503..9ce9363aee1c 100644
--- a/arch/s390/include/asm/uv.h
+++ b/arch/s390/include/asm/uv.h
@@ -298,6 +298,7 @@ static inline int uv_convert_from_secure(unsigned long paddr)
 	return -EINVAL;
 }
 
+int kvm_s390_pv_pin_page(struct gmap *gmap, unsigned long gpa);
 /*
  * Requests the Ultravisor to make a page accessible to a guest
  * (import). If it's brought in the first time, it will be cleared. If
@@ -317,6 +318,11 @@ static inline int uv_convert_to_secure(struct gmap *gmap, unsigned long gaddr)
 		.gaddr = gaddr
 	};
 
+	down_read(&gmap->mm->mmap_sem);
+	cc = kvm_s390_pv_pin_page(gmap, gaddr);
+	up_read(&gmap->mm->mmap_sem);
+	if (cc)
+		return cc;
 	cc = uv_call(0, (u64)&uvcb);
 
 	if (!cc)
diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c
index f7778493e829..36554402b5c6 100644
--- a/arch/s390/kernel/uv.c
+++ b/arch/s390/kernel/uv.c
@@ -98,4 +98,24 @@ void adjust_to_uv_max(unsigned long *vmax)
 	if (prot_virt_host && *vmax > uv_info.max_sec_stor_addr)
 		*vmax = uv_info.max_sec_stor_addr;
 }
+
+int kvm_s390_pv_pin_page(struct gmap *gmap, unsigned long gpa)
+{
+	unsigned long hva, gfn = gpa / PAGE_SIZE;
+	int rc;
+
+	if (!gmap->pinned_pages)
+		return -EINVAL;
+	hva = __gmap_translate(gmap, gpa);
+	if (IS_ERR_VALUE(hva))
+		return -EFAULT;
+	if (gmap->pinned_pages[gfn])
+		return -EEXIST;
+	rc = get_user_pages_fast(hva, 1, FOLL_WRITE, gmap->pinned_pages + gfn);
+	if (rc < 0)
+		return rc;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(kvm_s390_pv_pin_page);
+
 #endif
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index d1ba12f857e7..490fde080107 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2196,6 +2196,7 @@ static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd)
 		/* All VCPUs have to be destroyed before this call. */
 		mutex_lock(&kvm->lock);
 		kvm_s390_vcpu_block_all(kvm);
+		kvm_s390_pv_unpin(kvm);
 		r = kvm_s390_pv_destroy_vm(kvm);
 		if (!r)
 			kvm_s390_pv_dealloc_vm(kvm);
@@ -2680,6 +2681,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
 	kvm_s390_gisa_destroy(kvm);
 	if (IS_ENABLED(CONFIG_KVM_S390_PROTECTED_VIRTUALIZATION_HOST) &&
 	    kvm_s390_pv_is_protected(kvm)) {
+		kvm_s390_pv_unpin(kvm);
 		kvm_s390_pv_destroy_vm(kvm);
 		kvm_s390_pv_dealloc_vm(kvm);
 	}
diff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c
index 80aecd5bea9e..383e660e2221 100644
--- a/arch/s390/kvm/pv.c
+++ b/arch/s390/kvm/pv.c
@@ -15,8 +15,35 @@
 #include <asm/mman.h>
 #include "kvm-s390.h"
 
+static void unpin_destroy(struct page **pages, int nr)
+{
+	int i;
+	struct page *page;
+	u8 *val;
+
+	for (i = 0; i < nr; i++) {
+		page = pages[i];
+		if (!page)	/* page was never used */
+			continue;
+		val = (void *)page_to_phys(page);
+		READ_ONCE(*val);
+		put_page(page);
+	}
+}
+
+void kvm_s390_pv_unpin(struct kvm *kvm)
+{
+	unsigned long npages = kvm->arch.pv.guest_len / PAGE_SIZE;
+
+	mutex_lock(&kvm->slots_lock);
+	unpin_destroy(kvm->arch.gmap->pinned_pages, npages);
+	mutex_unlock(&kvm->slots_lock);
+}
+
 void kvm_s390_pv_dealloc_vm(struct kvm *kvm)
 {
+	vfree(kvm->arch.gmap->pinned_pages);
+	kvm->arch.gmap->pinned_pages = NULL;
 	vfree(kvm->arch.pv.stor_var);
 	free_pages(kvm->arch.pv.stor_base,
 		   get_order(uv_info.guest_base_stor_len));
@@ -28,7 +55,6 @@ int kvm_s390_pv_alloc_vm(struct kvm *kvm)
 	unsigned long base = uv_info.guest_base_stor_len;
 	unsigned long virt = uv_info.guest_virt_var_stor_len;
 	unsigned long npages = 0, vlen = 0;
-	struct kvm_memslots *slots;
 	struct kvm_memory_slot *memslot;
 
 	kvm->arch.pv.stor_var = NULL;
@@ -43,22 +69,26 @@ int kvm_s390_pv_alloc_vm(struct kvm *kvm)
 	 * Slots are sorted by GFN
 	 */
 	mutex_lock(&kvm->slots_lock);
-	slots = kvm_memslots(kvm);
-	memslot = slots->memslots;
+	memslot = kvm_memslots(kvm)->memslots;
 	npages = memslot->base_gfn + memslot->npages;
-
 	mutex_unlock(&kvm->slots_lock);
+
+	kvm->arch.gmap->pinned_pages = vzalloc(npages * sizeof(struct page *));
+	if (!kvm->arch.gmap->pinned_pages)
+		goto out_err;
 	kvm->arch.pv.guest_len = npages * PAGE_SIZE;
 
 	/* Allocate variable storage */
 	vlen = ALIGN(virt * ((npages * PAGE_SIZE) / HPAGE_SIZE), PAGE_SIZE);
 	vlen += uv_info.guest_virt_base_stor_len;
 	kvm->arch.pv.stor_var = vzalloc(vlen);
-	if (!kvm->arch.pv.stor_var) {
-		kvm_s390_pv_dealloc_vm(kvm);
-		return -ENOMEM;
-	}
+	if (!kvm->arch.pv.stor_var)
+		goto out_err;
 	return 0;
+
+out_err:
+	kvm_s390_pv_dealloc_vm(kvm);
+	return -ENOMEM;
 }
 
 int kvm_s390_pv_destroy_vm(struct kvm *kvm)
@@ -216,6 +246,11 @@ int kvm_s390_pv_unpack(struct kvm *kvm, unsigned long addr, unsigned long size,
 	for (i = 0; i < size / PAGE_SIZE; i++) {
 		uvcb.gaddr = addr + i * PAGE_SIZE;
 		uvcb.tweak[1] = i * PAGE_SIZE;
+		down_read(&kvm->mm->mmap_sem);
+		rc = kvm_s390_pv_pin_page(kvm->arch.gmap, uvcb.gaddr);
+		up_read(&kvm->mm->mmap_sem);
+		if (rc && (rc != -EEXIST))
+			break;
 retry:
 		rc = uv_call(0, (u64)&uvcb);
 		if (!rc)
-- 
2.20.1

  parent reply	other threads:[~2019-10-24 11:42 UTC|newest]

Thread overview: 213+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-24 11:40 [RFC 00/37] KVM: s390: Add support for protected VMs Janosch Frank
2019-10-24 11:40 ` [RFC 01/37] DOCUMENTATION: protvirt: Protected virtual machine introduction Janosch Frank
2019-11-01  8:18   ` Christian Borntraeger
2019-11-04 14:18   ` Cornelia Huck
2019-11-12 14:38     ` Janosch Frank
2019-10-24 11:40 ` [RFC 02/37] s390/protvirt: introduce host side setup Janosch Frank
2019-10-24 13:25   ` David Hildenbrand
2019-10-24 13:27     ` David Hildenbrand
2019-10-24 13:40       ` Christian Borntraeger
2019-10-24 15:52         ` David Hildenbrand
2019-10-24 16:30           ` Claudio Imbrenda
2019-10-24 16:54             ` David Hildenbrand
2019-10-28 14:54   ` Cornelia Huck
2019-10-28 20:20     ` Christian Borntraeger
2019-11-01  8:53   ` Christian Borntraeger
2019-11-04 14:26     ` Cornelia Huck
2019-11-12 14:47       ` Janosch Frank
2019-11-04 15:54   ` Cornelia Huck
2019-11-04 17:50     ` Christian Borntraeger
2019-11-05  9:26       ` Cornelia Huck
2019-11-08 12:14         ` Thomas Huth
2019-10-24 11:40 ` [RFC 03/37] s390/protvirt: add ultravisor initialization Janosch Frank
2019-10-25  9:21   ` David Hildenbrand
2019-10-28 15:48     ` Vasily Gorbik
2019-10-28 15:54       ` David Hildenbrand
2019-11-01 10:07   ` Christian Borntraeger
2019-11-07 15:28   ` Cornelia Huck
2019-11-07 15:32     ` Janosch Frank
2019-10-24 11:40 ` [RFC 04/37] KVM: s390: protvirt: Add initial lifecycle handling Janosch Frank
2019-10-25  8:58   ` David Hildenbrand
2019-10-25  9:02     ` David Hildenbrand
2019-11-04  8:18   ` Christian Borntraeger
2019-11-04  8:41     ` Janosch Frank
2019-11-07 16:29   ` Cornelia Huck
2019-11-08  7:36     ` Janosch Frank
2019-11-11 16:25       ` Cornelia Huck
2019-11-11 16:39         ` Janosch Frank
2019-11-11 16:54           ` Cornelia Huck
2019-11-13 10:05         ` Thomas Huth
2019-11-08 13:44   ` Thomas Huth
2019-11-13 10:28   ` Thomas Huth
2019-11-13 11:34     ` Janosch Frank
2019-11-13 14:03     ` [PATCH] Fix unpack Janosch Frank
2019-11-13 14:19       ` Thomas Huth
2019-11-13 14:36       ` Cornelia Huck
2019-11-13 11:48   ` [RFC 04/37] KVM: s390: protvirt: Add initial lifecycle handling Cornelia Huck
2019-10-24 11:40 ` [RFC 05/37] s390: KVM: Export PV handle to gmap Janosch Frank
2019-10-25  9:04   ` David Hildenbrand
2019-10-24 11:40 ` [RFC 06/37] s390: UV: Add import and export to UV library Janosch Frank
2019-10-25  8:31   ` David Hildenbrand
2019-10-25  8:39     ` Janosch Frank
2019-10-25  8:40       ` David Hildenbrand
2019-10-25  8:42         ` Janosch Frank
2019-11-01 11:26   ` Christian Borntraeger
2019-11-01 12:25     ` Janosch Frank
2019-11-01 12:39       ` Christian Borntraeger
2019-11-01 12:42   ` Christian Borntraeger
2019-11-11 16:40   ` Cornelia Huck
2019-11-11 16:56     ` Janosch Frank
2019-10-24 11:40 ` [RFC 07/37] KVM: s390: protvirt: Secure memory is not mergeable Janosch Frank
2019-10-24 16:07   ` David Hildenbrand
2019-10-24 16:33     ` Claudio Imbrenda
2019-10-24 16:49       ` David Hildenbrand
2019-10-25  7:18     ` Janosch Frank
2019-10-25  8:04       ` David Hildenbrand
2019-10-25  8:20         ` Janosch Frank
2019-10-25  7:46   ` David Hildenbrand
2019-10-25  8:24   ` [RFC v2] " Janosch Frank
2019-11-01 13:02     ` Christian Borntraeger
2019-11-04 14:32     ` David Hildenbrand
2019-11-04 14:36       ` Janosch Frank
2019-11-04 14:38         ` David Hildenbrand
2019-11-13 12:23     ` Thomas Huth
2019-11-13 15:54       ` Janosch Frank
2019-10-24 11:40 ` [RFC 08/37] KVM: s390: add missing include in gmap.h Janosch Frank
2019-10-25  8:24   ` David Hildenbrand
2019-11-13 12:27   ` Thomas Huth
2019-10-24 11:40 ` Janosch Frank [this message]
2019-10-25  8:49   ` [RFC 09/37] KVM: s390: protvirt: Implement on-demand pinning David Hildenbrand
2019-10-31 15:41     ` Christian Borntraeger
2019-10-31 17:30       ` David Hildenbrand
2019-10-31 20:57         ` Janosch Frank
2019-11-04 10:19           ` David Hildenbrand
2019-11-04 10:25             ` Janosch Frank
2019-11-04 10:27               ` David Hildenbrand
2019-11-04 13:58             ` Christian Borntraeger
2019-11-04 14:08               ` David Hildenbrand
2019-11-04 14:42                 ` David Hildenbrand
2019-11-04 17:17                   ` Cornelia Huck
2019-11-04 17:44                     ` David Hildenbrand
2019-11-04 18:38                     ` David Hildenbrand
2019-11-05  9:15                       ` Cornelia Huck
2019-11-01  8:50         ` Claudio Imbrenda
2019-11-04 10:22           ` David Hildenbrand
2019-11-02  8:53   ` Christian Borntraeger
2019-11-04 14:17   ` David Hildenbrand
2019-10-24 11:40 ` [RFC 10/37] s390: add (non)secure page access exceptions handlers Janosch Frank
2019-10-24 11:40 ` [RFC 11/37] DOCUMENTATION: protvirt: Interrupt injection Janosch Frank
2019-11-14 13:09   ` Cornelia Huck
2019-11-14 13:25     ` Claudio Imbrenda
2019-11-14 13:47       ` Cornelia Huck
2019-11-14 16:33         ` Janosch Frank
2019-10-24 11:40 ` [RFC 12/37] KVM: s390: protvirt: Handle SE notification interceptions Janosch Frank
2019-10-30 15:50   ` David Hildenbrand
2019-10-30 17:58     ` Janosch Frank
2019-11-05 18:04   ` Cornelia Huck
2019-11-05 18:15     ` Christian Borntraeger
2019-11-05 18:37       ` Cornelia Huck
2019-10-24 11:40 ` [RFC 13/37] KVM: s390: protvirt: Add interruption injection controls Janosch Frank
2019-10-30 15:53   ` David Hildenbrand
2019-10-31  8:48     ` Michael Mueller
2019-10-31  9:15       ` David Hildenbrand
2019-10-31 12:10         ` Michael Mueller
2019-11-05 17:51   ` Cornelia Huck
2019-11-07 12:42     ` Michael Mueller
2019-11-14 11:48   ` Thomas Huth
2019-10-24 11:40 ` [RFC 14/37] KVM: s390: protvirt: Implement interruption injection Janosch Frank
2019-11-04 10:29   ` David Hildenbrand
2019-11-04 14:05     ` Christian Borntraeger
2019-11-04 14:23       ` David Hildenbrand
2019-11-14 12:07   ` Thomas Huth
2019-10-24 11:40 ` [RFC 15/37] KVM: s390: protvirt: Add machine-check interruption injection controls Janosch Frank
2019-11-13 14:49   ` Thomas Huth
2019-11-13 15:57     ` Michael Mueller
2019-10-24 11:40 ` [RFC 16/37] KVM: s390: protvirt: Implement machine-check interruption injection Janosch Frank
2019-11-05 18:11   ` Cornelia Huck
2019-10-24 11:40 ` [RFC 17/37] DOCUMENTATION: protvirt: Instruction emulation Janosch Frank
2019-11-14 15:15   ` Cornelia Huck
2019-11-14 15:20     ` Claudio Imbrenda
2019-11-14 15:41       ` Cornelia Huck
2019-11-14 15:55         ` Janosch Frank
2019-11-14 16:03           ` Cornelia Huck
2019-11-14 16:18             ` Janosch Frank
2019-10-24 11:40 ` [RFC 18/37] KVM: s390: protvirt: Handle spec exception loops Janosch Frank
2019-11-14 14:22   ` Thomas Huth
2019-10-24 11:40 ` [RFC 19/37] KVM: s390: protvirt: Add new gprs location handling Janosch Frank
2019-11-04 11:25   ` David Hildenbrand
2019-11-05 12:01     ` Christian Borntraeger
2019-11-05 12:39       ` Janosch Frank
2019-11-05 13:55         ` David Hildenbrand
2019-11-05 14:11           ` Janosch Frank
2019-11-05 14:18             ` David Hildenbrand
2019-11-14 14:46               ` Thomas Huth
2019-11-14 14:44   ` Thomas Huth
2019-11-14 15:56     ` Janosch Frank
2019-10-24 11:40 ` [RFC 20/37] KVM: S390: protvirt: Introduce instruction data area bounce buffer Janosch Frank
2019-11-14 15:36   ` Thomas Huth
2019-11-14 16:04     ` Janosch Frank
2019-11-14 16:21     ` [PATCH] Fixup sida bouncing Janosch Frank
2019-11-15  8:19       ` Thomas Huth
2019-11-15  8:50         ` Janosch Frank
2019-11-15  9:21           ` Thomas Huth
2019-10-24 11:40 ` [RFC 21/37] KVM: S390: protvirt: Instruction emulation Janosch Frank
2019-11-14 15:38   ` Cornelia Huck
2019-11-14 16:00     ` Janosch Frank
2019-11-14 16:05       ` Cornelia Huck
2019-10-24 11:40 ` [RFC 22/37] KVM: s390: protvirt: Add SCLP handling Janosch Frank
2019-10-24 11:40 ` [RFC 23/37] KVM: s390: protvirt: Make sure prefix is always protected Janosch Frank
2019-11-18 16:39   ` Cornelia Huck
2019-11-19  8:11     ` Janosch Frank
2019-11-19  9:45       ` Cornelia Huck
2019-11-19 10:08         ` Janosch Frank
2019-11-19 10:18   ` David Hildenbrand
2019-11-19 11:36     ` Janosch Frank
2019-10-24 11:40 ` [RFC 24/37] KVM: s390: protvirt: Write sthyi data to instruction data area Janosch Frank
2019-11-15  8:04   ` Thomas Huth
2019-11-15 10:16     ` Janosch Frank
2019-11-15 10:21       ` Thomas Huth
2019-11-15 12:17         ` [PATCH] SIDAD macro fixup Janosch Frank
2019-10-24 11:40 ` [RFC 25/37] KVM: s390: protvirt: STSI handling Janosch Frank
2019-11-15  8:27   ` Thomas Huth
2019-10-24 11:40 ` [RFC 26/37] KVM: s390: protvirt: Only sync fmt4 registers Janosch Frank
2019-11-15  9:02   ` Thomas Huth
2019-11-15 10:01     ` Janosch Frank
2019-10-24 11:40 ` [RFC 27/37] KVM: s390: protvirt: SIGP handling Janosch Frank
2019-10-30 18:29   ` David Hildenbrand
2019-11-15 11:15   ` Thomas Huth
2019-10-24 11:40 ` [RFC 28/37] KVM: s390: protvirt: Add program exception injection Janosch Frank
2019-10-24 11:40 ` [RFC 29/37] KVM: s390: protvirt: Sync pv state Janosch Frank
2019-11-15  9:36   ` Thomas Huth
2019-11-15  9:59     ` Janosch Frank
2019-10-24 11:40 ` [RFC 30/37] DOCUMENTATION: protvirt: Diag 308 IPL Janosch Frank
2019-11-06 16:48   ` Cornelia Huck
2019-11-06 17:05     ` Janosch Frank
2019-11-06 17:37       ` Cornelia Huck
2019-11-06 21:02         ` Janosch Frank
2019-11-07  8:53           ` Cornelia Huck
2019-11-07  8:59             ` Janosch Frank
2019-10-24 11:40 ` [RFC 31/37] KVM: s390: protvirt: Add diag 308 subcode 8 - 10 handling Janosch Frank
2019-11-15 10:04   ` Thomas Huth
2019-11-15 10:20     ` Janosch Frank
2019-11-15 10:27       ` Thomas Huth
2019-11-15 11:29         ` Janosch Frank
2019-10-24 11:40 ` [RFC 32/37] KVM: s390: protvirt: UV calls diag308 0, 1 Janosch Frank
2019-11-15 10:07   ` Thomas Huth
2019-11-15 11:39     ` Janosch Frank
2019-11-15 13:30       ` Thomas Huth
2019-11-15 14:08         ` Janosch Frank
2019-10-24 11:40 ` [RFC 33/37] KVM: s390: Introduce VCPU reset IOCTL Janosch Frank
2019-11-15 10:47   ` Thomas Huth
2019-11-15 13:06     ` Janosch Frank
2019-11-15 13:18       ` Thomas Huth
2019-10-24 11:40 ` [RFC 34/37] KVM: s390: protvirt: Report CPU state to Ultravisor Janosch Frank
2019-10-24 11:40 ` [RFC 35/37] KVM: s390: Fix cpu reset local IRQ clearing Janosch Frank
2019-11-15 11:23   ` Thomas Huth
2019-11-15 11:37     ` Janosch Frank
2019-10-24 11:40 ` [RFC 36/37] KVM: s390: protvirt: Support cmd 5 operation state Janosch Frank
2019-11-15 11:25   ` Thomas Huth
2019-11-18 17:38   ` Cornelia Huck
2019-11-19  8:13     ` Janosch Frank
2019-11-19 10:23       ` Cornelia Huck
2019-11-19 11:40         ` Janosch Frank
2019-10-24 11:40 ` [RFC 37/37] KVM: s390: protvirt: Add UV debug trace Janosch Frank

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