From: Paul Durrant <paul@xen.org>
To: David Woodhouse <dwmw2@infradead.org>,
Paul Durrant <paul@xen.org>,
Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v9 08/15] KVM: pfncache: allow a cache to be activated with a fixed (userspace) HVA
Date: Wed, 22 Nov 2023 12:18:15 +0000 [thread overview]
Message-ID: <20231122121822.1042-9-paul@xen.org> (raw)
In-Reply-To: <20231122121822.1042-1-paul@xen.org>
From: Paul Durrant <pdurrant@amazon.com>
Some pfncache pages may actually be overlays on guest memory that have a
fixed HVA within the VMM. It's pointless to invalidate such cached
mappings if the overlay is moved so allow a cache to be activated directly
with the HVA to cater for such cases. A subsequent patch will make use
of this facility.
Signed-off-by: Paul Durrant <pdurrant@amazon.com>
---
Cc: Sean Christopherson <seanjc@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: David Woodhouse <dwmw2@infradead.org>
v9:
- Pass both GPA and HVA into __kvm_gpc_refresh() rather than overloading
the address paraneter and using a bool flag to indicated what it is.
v8:
- Re-worked to avoid messing with struct gfn_to_pfn_cache.
---
include/linux/kvm_host.h | 19 ++++++++++++++++++-
virt/kvm/pfncache.c | 35 +++++++++++++++++++++++++++--------
2 files changed, 45 insertions(+), 9 deletions(-)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index b1dc2e5a64f3..484c587e8290 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1312,6 +1312,22 @@ void kvm_gpc_init(struct gfn_to_pfn_cache *gpc, struct kvm *kvm);
*/
int kvm_gpc_activate(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long len);
+/**
+ * kvm_gpc_activate_hva - prepare a cached kernel mapping and HPA for a given HVA.
+ *
+ * @gpc: struct gfn_to_pfn_cache object.
+ * @hva: userspace virtual address to map.
+ * @len: sanity check; the range being access must fit a single page.
+ *
+ * @return: 0 for success.
+ * -EINVAL for a mapping which would cross a page boundary.
+ * -EFAULT for an untranslatable guest physical address.
+ *
+ * The semantics of this function are the same as those of kvm_gpc_activate(). It
+ * merely bypasses a layer of address translation.
+ */
+int kvm_gpc_activate_hva(struct gfn_to_pfn_cache *gpc, unsigned long hva, unsigned long len);
+
/**
* kvm_gpc_check - check validity of a gfn_to_pfn_cache.
*
@@ -1365,7 +1381,8 @@ void kvm_gpc_deactivate(struct gfn_to_pfn_cache *gpc);
*/
static inline void kvm_gpc_mark_dirty(struct gfn_to_pfn_cache *gpc)
{
- mark_page_dirty_in_slot(gpc->kvm, gpc->memslot, gpc->gpa >> PAGE_SHIFT);
+ if (gpc->gpa != KVM_XEN_INVALID_GPA)
+ mark_page_dirty_in_slot(gpc->kvm, gpc->memslot, gpc->gpa >> PAGE_SHIFT);
}
void kvm_sigset_activate(struct kvm_vcpu *vcpu);
diff --git a/virt/kvm/pfncache.c b/virt/kvm/pfncache.c
index 97eec8ee3449..c2a2d1e145b6 100644
--- a/virt/kvm/pfncache.c
+++ b/virt/kvm/pfncache.c
@@ -209,11 +209,13 @@ static kvm_pfn_t hva_to_pfn_retry(struct gfn_to_pfn_cache *gpc)
return -EFAULT;
}
-static int __kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, gpa_t gpa,
+static int __kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long uhva,
unsigned long len)
{
struct kvm_memslots *slots = kvm_memslots(gpc->kvm);
- unsigned long page_offset = offset_in_page(gpa);
+ unsigned long page_offset = (gpa != KVM_XEN_INVALID_GPA) ?
+ offset_in_page(gpa) :
+ offset_in_page(uhva);
bool unmap_old = false;
unsigned long old_uhva;
kvm_pfn_t old_pfn;
@@ -246,9 +248,15 @@ static int __kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, gpa_t gpa,
old_khva = (void *)PAGE_ALIGN_DOWN((uintptr_t)gpc->khva);
old_uhva = PAGE_ALIGN_DOWN(gpc->uhva);
- /* Refresh the userspace HVA if necessary */
- if (gpc->gpa != gpa || gpc->generation != slots->generation ||
- kvm_is_error_hva(gpc->uhva)) {
+ if (gpa == KVM_XEN_INVALID_GPA) {
+ gpc->gpa = KVM_XEN_INVALID_GPA;
+ gpc->uhva = PAGE_ALIGN_DOWN(uhva);
+
+ if (gpc->uhva != old_uhva)
+ hva_change = true;
+ } else if (gpc->gpa != gpa ||
+ gpc->generation != slots->generation ||
+ kvm_is_error_hva(gpc->uhva)) {
gfn_t gfn = gpa_to_gfn(gpa);
gpc->gpa = gpa;
@@ -319,7 +327,7 @@ static int __kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, gpa_t gpa,
int kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, unsigned long len)
{
- return __kvm_gpc_refresh(gpc, gpc->gpa, len);
+ return __kvm_gpc_refresh(gpc, gpc->gpa, gpc->uhva, len);
}
void kvm_gpc_init(struct gfn_to_pfn_cache *gpc, struct kvm *kvm)
@@ -332,7 +340,8 @@ void kvm_gpc_init(struct gfn_to_pfn_cache *gpc, struct kvm *kvm)
gpc->uhva = KVM_HVA_ERR_BAD;
}
-int kvm_gpc_activate(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long len)
+static int __kvm_gpc_activate(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long uhva,
+ unsigned long len)
{
struct kvm *kvm = gpc->kvm;
@@ -353,7 +362,17 @@ int kvm_gpc_activate(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long len)
gpc->active = true;
write_unlock_irq(&gpc->lock);
}
- return __kvm_gpc_refresh(gpc, gpa, len);
+ return __kvm_gpc_refresh(gpc, gpa, uhva, len);
+}
+
+int kvm_gpc_activate(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long len)
+{
+ return __kvm_gpc_activate(gpc, gpa, KVM_HVA_ERR_BAD, len);
+}
+
+int kvm_gpc_activate_hva(struct gfn_to_pfn_cache *gpc, unsigned long uhva, unsigned long len)
+{
+ return __kvm_gpc_activate(gpc, KVM_XEN_INVALID_GPA, uhva, len);
}
void kvm_gpc_deactivate(struct gfn_to_pfn_cache *gpc)
--
2.39.2
next prev parent reply other threads:[~2023-11-22 12:19 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-22 12:18 [PATCH v9 00/15] KVM: xen: update shared_info and vcpu_info handling Paul Durrant
2023-11-22 12:18 ` [PATCH v9 01/15] KVM: pfncache: Add a map helper function Paul Durrant
2023-11-22 12:18 ` [PATCH v9 02/15] KVM: pfncache: remove unnecessary exports Paul Durrant
2023-11-22 12:18 ` [PATCH v9 03/15] KVM: xen: mark guest pages dirty with the pfncache lock held Paul Durrant
2023-11-22 12:18 ` [PATCH v9 04/15] KVM: pfncache: add a mark-dirty helper Paul Durrant
2023-11-22 12:24 ` David Woodhouse
2023-11-22 13:04 ` Paul Durrant
2023-11-22 12:18 ` [PATCH v9 05/15] KVM: pfncache: remove KVM_GUEST_USES_PFN usage Paul Durrant
2023-11-22 12:18 ` [PATCH v9 06/15] KVM: pfncache: stop open-coding offset_in_page() Paul Durrant
2023-11-22 12:18 ` [PATCH v9 07/15] KVM: pfncache: include page offset in uhva and use it consistently Paul Durrant
2023-11-22 12:18 ` Paul Durrant [this message]
2023-11-22 12:25 ` [PATCH v9 08/15] KVM: pfncache: allow a cache to be activated with a fixed (userspace) HVA David Woodhouse
2023-11-22 12:18 ` [PATCH v9 09/15] KVM: xen: allow shared_info to be mapped by fixed HVA Paul Durrant
2023-11-22 12:18 ` [PATCH v9 10/15] KVM: xen: allow vcpu_info " Paul Durrant
2023-11-22 12:18 ` [PATCH v9 11/15] KVM: selftests / xen: map shared_info using HVA rather than GFN Paul Durrant
2023-11-22 12:18 ` [PATCH v9 12/15] KVM: selftests / xen: re-map vcpu_info using HVA rather than GPA Paul Durrant
2023-11-22 12:18 ` [PATCH v9 13/15] KVM: xen: advertize the KVM_XEN_HVM_CONFIG_SHARED_INFO_HVA capability Paul Durrant
2023-11-22 12:18 ` [PATCH v9 14/15] KVM: xen: split up kvm_xen_set_evtchn_fast() Paul Durrant
2023-11-22 12:18 ` [PATCH v9 15/15] KVM: xen: allow vcpu_info content to be 'safely' copied Paul Durrant
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