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Message-Id: <20210624035749.4054934-7-stevensd@google.com>
Date: Thu, 24 Jun 2021 12:57:49 +0900
From: David Stevens <stevensd@...omium.org>
To: Marc Zyngier <maz@...nel.org>, Huacai Chen <chenhuacai@...nel.org>,
Aleksandar Markovic <aleksandar.qemu.devel@...il.com>,
Paul Mackerras <paulus@...abs.org>,
Paolo Bonzini <pbonzini@...hat.com>,
Zhenyu Wang <zhenyuw@...ux.intel.com>,
Zhi Wang <zhi.a.wang@...el.com>
Cc: James Morse <james.morse@....com>,
Alexandru Elisei <alexandru.elisei@....com>,
Suzuki K Poulose <suzuki.poulose@....com>,
Will Deacon <will@...nel.org>,
Sean Christopherson <seanjc@...gle.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>,
linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
kvm@...r.kernel.org, kvm-ppc@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org, intel-gvt-dev@...ts.freedesktop.org,
intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
David Stevens <stevensd@...gle.com>
Subject: [PATCH 6/6] drm/i915/gvt: use gfn_to_pfn's page instead of pfn
Return struct page instead of pfn from gfn_to_mfn. This function is only
used to determine if the page is a transparent hugepage, to enable 2MB
huge gtt shadowing. Returning the page directly avoids the risk of
calling pfn_to_page on a VM_IO|VM_PFNMAP pfn.
This change also properly releases the reference on the page returned by
gfn_to_pfn.
Signed-off-by: David Stevens <stevensd@...gle.com>
---
drivers/gpu/drm/i915/gvt/gtt.c | 12 ++++++++----
drivers/gpu/drm/i915/gvt/hypercall.h | 3 ++-
drivers/gpu/drm/i915/gvt/kvmgt.c | 12 ++++--------
drivers/gpu/drm/i915/gvt/mpt.h | 8 ++++----
4 files changed, 18 insertions(+), 17 deletions(-)
diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
index 9478c132d7b6..b2951c560582 100644
--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -1160,16 +1160,20 @@ static int is_2MB_gtt_possible(struct intel_vgpu *vgpu,
struct intel_gvt_gtt_entry *entry)
{
struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
- unsigned long pfn;
+ struct page *page;
+ bool is_trans_huge;
if (!HAS_PAGE_SIZES(vgpu->gvt->gt->i915, I915_GTT_PAGE_SIZE_2M))
return 0;
- pfn = intel_gvt_hypervisor_gfn_to_mfn(vgpu, ops->get_pfn(entry));
- if (pfn == INTEL_GVT_INVALID_ADDR)
+ page = intel_gvt_hypervisor_gfn_to_mfn_page(vgpu, ops->get_pfn(entry));
+ if (!page)
return -EINVAL;
- return PageTransHuge(pfn_to_page(pfn));
+ is_trans_huge = PageTransHuge(page);
+ put_page(page);
+
+ return is_trans_huge;
}
static int split_2MB_gtt_entry(struct intel_vgpu *vgpu,
diff --git a/drivers/gpu/drm/i915/gvt/hypercall.h b/drivers/gpu/drm/i915/gvt/hypercall.h
index b79da5124f83..017190ff52d5 100644
--- a/drivers/gpu/drm/i915/gvt/hypercall.h
+++ b/drivers/gpu/drm/i915/gvt/hypercall.h
@@ -60,7 +60,8 @@ struct intel_gvt_mpt {
unsigned long len);
int (*write_gpa)(unsigned long handle, unsigned long gpa, void *buf,
unsigned long len);
- unsigned long (*gfn_to_mfn)(unsigned long handle, unsigned long gfn);
+ struct page *(*gfn_to_mfn_page)(unsigned long handle,
+ unsigned long gfn);
int (*dma_map_guest_page)(unsigned long handle, unsigned long gfn,
unsigned long size, dma_addr_t *dma_addr);
diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index b829ff67e3d9..1e97ae813ed0 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -1928,21 +1928,17 @@ static int kvmgt_inject_msi(unsigned long handle, u32 addr, u16 data)
return -EFAULT;
}
-static unsigned long kvmgt_gfn_to_pfn(unsigned long handle, unsigned long gfn)
+static struct page *kvmgt_gfn_to_page(unsigned long handle, unsigned long gfn)
{
struct kvmgt_guest_info *info;
kvm_pfn_t pfn;
if (!handle_valid(handle))
- return INTEL_GVT_INVALID_ADDR;
+ return NULL;
info = (struct kvmgt_guest_info *)handle;
- pfn = kvm_pfn_page_unwrap(gfn_to_pfn(info->kvm, gfn));
- if (is_error_noslot_pfn(pfn))
- return INTEL_GVT_INVALID_ADDR;
-
- return pfn;
+ return gfn_to_pfn(info->kvm, gfn).page;
}
static int kvmgt_dma_map_guest_page(unsigned long handle, unsigned long gfn,
@@ -2112,7 +2108,7 @@ static const struct intel_gvt_mpt kvmgt_mpt = {
.disable_page_track = kvmgt_page_track_remove,
.read_gpa = kvmgt_read_gpa,
.write_gpa = kvmgt_write_gpa,
- .gfn_to_mfn = kvmgt_gfn_to_pfn,
+ .gfn_to_mfn_page = kvmgt_gfn_to_page,
.dma_map_guest_page = kvmgt_dma_map_guest_page,
.dma_unmap_guest_page = kvmgt_dma_unmap_guest_page,
.dma_pin_guest_page = kvmgt_dma_pin_guest_page,
diff --git a/drivers/gpu/drm/i915/gvt/mpt.h b/drivers/gpu/drm/i915/gvt/mpt.h
index 550a456e936f..9169b83cf0f6 100644
--- a/drivers/gpu/drm/i915/gvt/mpt.h
+++ b/drivers/gpu/drm/i915/gvt/mpt.h
@@ -214,17 +214,17 @@ static inline int intel_gvt_hypervisor_write_gpa(struct intel_vgpu *vgpu,
}
/**
- * intel_gvt_hypervisor_gfn_to_mfn - translate a GFN to MFN
+ * intel_gvt_hypervisor_gfn_to_mfn_page - translate a GFN to MFN page
* @vgpu: a vGPU
* @gpfn: guest pfn
*
* Returns:
- * MFN on success, INTEL_GVT_INVALID_ADDR if failed.
+ * struct page* on success, NULL if failed.
*/
-static inline unsigned long intel_gvt_hypervisor_gfn_to_mfn(
+static inline unsigned long intel_gvt_hypervisor_gfn_to_mfn_page(
struct intel_vgpu *vgpu, unsigned long gfn)
{
- return intel_gvt_host.mpt->gfn_to_mfn(vgpu->handle, gfn);
+ return intel_gvt_host.mpt->gfn_to_mfn_page(vgpu->handle, gfn);
}
/**
--
2.32.0.93.g670b81a890-goog
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