On Wed, Sep 6, 2023 at 9:45 AM Sean Christopherson wrote:
>
> On Tue, Sep 05, 2023, David Stevens wrote:
> > On Wed, Jul 12, 2023 at 7:00 AM Sean Christopherson
> > wrote:
> > >
> > > On Tue, Jul 11, 2023, Zhi Wang wrote:
> > > > On Thu, 6 Jul
On Wed, Jul 12, 2023 at 7:00 AM Sean Christopherson wrote:
>
> On Tue, Jul 11, 2023, Zhi Wang wrote:
> > On Thu, 6 Jul 2023 15:49:39 +0900
> > David Stevens wrote:
> >
> > > On Wed, Jul 5, 2023 at 10:19___PM Zhi Wang
> > > wrote:
> > > >
&g
On Fri, Aug 25, 2023 at 12:15 AM Sean Christopherson wrote:
>
> On Thu, Aug 24, 2023, David Stevens wrote:
> > On Wed, Jul 5, 2023 at 7:25 PM Yu Zhang wrote:
> > >
> > > On Tue, Jul 04, 2023 at 04:50:50PM +0900, David Stevens wrote:
> > > > @@ -4529,7 +4
From: David Stevens
This patch series adds support for mapping VM_IO and VM_PFNMAP memory
that is backed by struct pages that aren't currently being refcounted
(e.g. tail pages of non-compound higher order allocations) into the
guest.
Our use case is virtio-gpu blob resources [1], which
From: David Stevens
All callers have been migrated to __kvm_follow_pfn.
Signed-off-by: David Stevens
---
virt/kvm/kvm_main.c | 33 -
1 file changed, 33 deletions(-)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index fa1848c6c84f..aebaf4a7340e 100644
From: David Stevens
Migrate from __gfn_to_pfn_memslot to __kvm_follow_pfn. As part of the
refactoring, remove the redundant calls to get_user_page_fast_only,
since the check for !async && !atomic was removed from the KVM generic
code in b9b33da2aa74. Also, remove the kvm_ro parameter
From: David Stevens
Migrate from __gfn_to_pfn_memslot to __kvm_follow_pfn.
Signed-off-by: David Stevens
---
arch/arm64/kvm/mmu.c | 25 ++---
1 file changed, 14 insertions(+), 11 deletions(-)
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index d3b4feed460c
From: David Stevens
Stop passing FOLL_GET to __kvm_follow_pfn. This allows the host to map
memory into the guest that is backed by un-refcounted struct pages - for
example, the tail pages of higher order non-compound pages allocated by
the amdgpu driver via ttm_pool_alloc_page.
The bulk
From: David Stevens
Migrate from __gfn_to_pfn_memslot to __kvm_follow_pfn. Most arguments
directly map to the new API. The largest change is replacing the async
in/out parameter with FOLL_NOWAIT parameter and the KVM_PFN_ERR_NEEDS_IO
return value.
Signed-off-by: David Stevens
---
arch/x86/kvm
From: David Stevens
Make it so that __kvm_follow_pfn does not imply FOLL_GET. This allows
callers to resolve a gfn when the associated pfn has a valid struct page
that isn't being actively refcounted (e.g. tail pages of non-compound
higher order pages). For a caller to safely omit FOLL_GET, all
From: David Stevens
Introduce __kvm_follow_pfn, which will replace __gfn_to_pfn_memslot.
__kvm_follow_pfn refactors the old API's arguments into a struct and,
where possible, combines the boolean arguments into a single flags
argument.
Signed-off-by: David Stevens
---
include/linux/kvm_host.h
From: Sean Christopherson
Assert that a page's refcount is elevated, i.e. that _something_ holds a
reference to the page, when KVM marks a page as accessed and/or dirty.
KVM typically doesn't hold a reference to pages that are mapped into the
guest, e.g. to allow page migration, compaction,
On Wed, Jul 5, 2023 at 7:25 PM Yu Zhang wrote:
>
> On Tue, Jul 04, 2023 at 04:50:50PM +0900, David Stevens wrote:
> > From: David Stevens
> >
> > Stop passing FOLL_GET to __kvm_follow_pfn. This allows the host to map
> > memory into the guest that is backed
On Thu, Jul 6, 2023 at 10:54 AM Isaku Yamahata wrote:
>
> On Tue, Jul 04, 2023 at 04:50:49PM +0900,
> David Stevens wrote:
>
> > From: David Stevens
> >
> > Migrate from __gfn_to_pfn_memslot to __kvm_follow_pfn.
> >
> > Signed-off-by: David Stevens
On Wed, Jul 19, 2023 at 3:35 PM Yan Zhao wrote:
>
> On Tue, Jul 04, 2023 at 04:50:50PM +0900, David Stevens wrote:
> > @@ -4451,7 +4461,8 @@ static int direct_page_fault(struct kvm_vcpu *vcpu,
> > struct kvm_page_fault *fault
> >
> > out_unlock:
> &g
On Tue, Jul 11, 2023 at 1:34 AM Isaku Yamahata wrote:
>
> On Fri, Jul 07, 2023 at 10:35:02AM +0900,
> David Stevens wrote:
>
> > > > > > diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> > > > > > index e44ab512c3a1..b1607e314497
On Fri, Jul 7, 2023 at 12:58 AM Isaku Yamahata wrote:
>
> On Thu, Jul 06, 2023 at 01:52:08PM +0900,
> David Stevens wrote:
>
> > On Wed, Jul 5, 2023 at 7:17 PM Yu Zhang wrote:
> > >
> > > On Tue, Jul 04, 2023 at 04:50:50PM +0900, David Steven
On Wed, Jul 5, 2023 at 10:19 PM Zhi Wang wrote:
>
> On Tue, 4 Jul 2023 16:50:48 +0900
> David Stevens wrote:
>
> > From: David Stevens
> >
> > Make it so that __kvm_follow_pfn does not imply FOLL_GET. This allows
> > callers to resolve a gfn when the as
On Wed, Jul 5, 2023 at 8:56 PM Yu Zhang wrote:
>
> On Tue, Jul 04, 2023 at 04:50:48PM +0900, David Stevens wrote:
> > From: David Stevens
> >
> > Make it so that __kvm_follow_pfn does not imply FOLL_GET. This allows
> > callers to resolve a gfn when the associat
On Thu, Jul 6, 2023 at 10:34 AM Isaku Yamahata wrote:
>
> On Tue, Jul 04, 2023 at 04:50:47PM +0900,
> David Stevens wrote:
>
> > From: David Stevens
> >
> > Introduce __kvm_follow_pfn, which will replace __gfn_to_pfn_memslot.
> > __kvm_follow_pfn refactors t
On Wed, Jul 5, 2023 at 7:53 PM Yu Zhang wrote:
>
> On Wed, Jul 05, 2023 at 06:22:59PM +0900, David Stevens wrote:
> > On Wed, Jul 5, 2023 at 12:10 PM Yu Zhang wrote:
> > >
> > > > @@ -2514,35 +2512,26 @@ static bool hva_to_pfn_fast(unsigned lon
On Thu, Jul 6, 2023 at 11:10 AM Isaku Yamahata wrote:
>
> On Tue, Jul 04, 2023 at 04:50:50PM +0900,
> David Stevens wrote:
>
> > diff --git a/arch/x86/kvm/mmu/spte.c b/arch/x86/kvm/mmu/spte.c
> > index cf2c6426a6fc..46c681dc45e6 100644
> > --- a/arch/x86/kvm/mmu/spt
On Wed, Jul 5, 2023 at 7:17 PM Yu Zhang wrote:
>
> On Tue, Jul 04, 2023 at 04:50:50PM +0900, David Stevens wrote:
> > From: David Stevens
> >
> > Stop passing FOLL_GET to __kvm_follow_pfn. This allows the host to map
> > memory into the guest that is backed
On Wed, Jul 5, 2023 at 12:10 PM Yu Zhang wrote:
>
> > @@ -2514,35 +2512,26 @@ static bool hva_to_pfn_fast(unsigned long addr,
> > bool write_fault,
> > * The slow path to get the pfn of the specified host virtual address,
> > * 1 indicates success, -errno is returned if error is detected.
>
On Wed, Jul 5, 2023 at 5:47 PM Zhi Wang wrote:
>
> On Tue, 4 Jul 2023 16:50:47 +0900
> David Stevens wrote:
>
> > From: David Stevens
> >
> > Introduce __kvm_follow_pfn, which will replace __gfn_to_pfn_memslot.
> > __kvm_follow_pfn refactors the old API's ar
From: David Stevens
All callers have been migrated to __kvm_follow_pfn.
Signed-off-by: David Stevens
---
virt/kvm/kvm_main.c | 33 -
1 file changed, 33 deletions(-)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 0f7b41f220b6..5b5afd70f239 100644
From: David Stevens
Migrate from __gfn_to_pfn_memslot to __kvm_follow_pfn. As part of the
refactoring, remove the redundant calls to get_user_page_fast_only,
since the check for !async && !atomic was removed from the KVM generic
code in b9b33da2aa74. Also, remove the kvm_ro parameter
From: David Stevens
Migrate from __gfn_to_pfn_memslot to __kvm_follow_pfn.
Signed-off-by: David Stevens
---
arch/arm64/kvm/mmu.c | 25 ++---
1 file changed, 14 insertions(+), 11 deletions(-)
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 6db9ef288ec3
From: David Stevens
Migrate from __gfn_to_pfn_memslot to __kvm_follow_pfn.
Signed-off-by: David Stevens
---
arch/x86/kvm/mmu/mmu.c | 35 +--
1 file changed, 25 insertions(+), 10 deletions(-)
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index
From: David Stevens
Stop passing FOLL_GET to __kvm_follow_pfn. This allows the host to map
memory into the guest that is backed by un-refcounted struct pages - for
example, higher order non-compound pages allocated by the amdgpu driver
via ttm_pool_alloc_page.
The bulk of this change
From: David Stevens
Make it so that __kvm_follow_pfn does not imply FOLL_GET. This allows
callers to resolve a gfn when the associated pfn has a valid struct page
that isn't being actively refcounted (e.g. tail pages of non-compound
higher order pages). For a caller to safely omit FOLL_GET, all
From: David Stevens
Introduce __kvm_follow_pfn, which will replace __gfn_to_pfn_memslot.
__kvm_follow_pfn refactors the old API's arguments into a struct and,
where possible, combines the boolean arguments into a single flags
argument.
Signed-off-by: David Stevens
---
include/linux/kvm_host.h
From: Sean Christopherson
Assert that a page's refcount is elevated, i.e. that _something_ holds a
reference to the page, when KVM marks a page as accessed and/or dirty.
KVM typically doesn't hold a reference to pages that are mapped into the
guest, e.g. to allow page migration, compaction,
From: David Stevens
This patch series adds support for mapping VM_IO and VM_PFNMAP memory
that is backed by struct pages that aren't currently being refcounted
(e.g. tail pages of non-compound higher order allocations) into the
guest.
Our use case is virtio-gpu blob resources [1], which
From: David Stevens
Remove two warnings that require ref counts for pages to be non-zero, as
mapped pfns from follow_pfn may not have an initialized ref count.
Signed-off-by: David Stevens
---
arch/x86/kvm/mmu/mmu.c | 7 ---
virt/kvm/kvm_main.c| 2 +-
2 files changed, 1 insertion
From: David Stevens
Covert usages of the deprecated gfn_to_pfn functions to the new
gfn_to_pfn_page functions.
Signed-off-by: David Stevens
---
arch/arm64/kvm/mmu.c | 26 --
1 file changed, 16 insertions(+), 10 deletions(-)
diff --git a/arch/arm64/kvm/mmu.c b/arch
From: David Stevens
Covert usages of the deprecated gfn_to_pfn functions to the new
gfn_to_pfn_page functions.
Signed-off-by: David Stevens
---
arch/x86/kvm/mmu/mmu.c | 43 -
arch/x86/kvm/mmu/mmu_internal.h | 3 ++-
arch/x86/kvm/mmu/paging_tmpl.h
From: David Stevens
Introduce new gfn_to_pfn_page functions that parallel existing
gfn_to_pfn functions. The new functions are identical except they take
an additional out parameter that is used to return the struct page if
the hva was resolved by gup. This allows callers to differentiate
From: Nicholas Piggin
It's possible to create a region which maps valid but non-refcounted
pages (e.g., tail pages of non-compound higher order allocations). These
host pages can then be returned by gfn_to_page, gfn_to_pfn, etc., family
of APIs, which take a reference to the page, which takes it
ges to mmu_audit.c
- Include Nicholas Piggin's patch to avoid corrupting refcount in the
follow_pte case, and use it in depreciated gfn_to_pfn functions.
- Rebase on kvm/next
David Stevens (4):
KVM: mmu: introduce new gfn_to_pfn_page functions
KVM: x86/mmu: use gfn_to_pfn_page
KVM: arm64/
Please ignore this last patch. It was put together as an afterthought
and wasn't properly tested.
-David
On Thu, Jun 24, 2021 at 12:59 PM David Stevens wrote:
>
> Return struct page instead of pfn from gfn_to_mfn. This function is only
> used to determine if the page is a transparent
the reference on the page returned by
gfn_to_pfn.
Signed-off-by: David Stevens
---
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
From: David Stevens
Remove two warnings that require ref counts for pages to be non-zero, as
mapped pfns from follow_pfn may not have an initialized ref count.
Signed-off-by: David Stevens
---
arch/x86/kvm/mmu/mmu.c | 7 ---
virt/kvm/kvm_main.c| 2 +-
2 files changed, 1 insertion
From: David Stevens
Avoid converting pfns returned by follow_fault_pfn to struct pages to
transiently take a reference. The reference was originally taken to
match the reference taken by gup. However, pfns returned by
follow_fault_pfn may not have a struct page set up for reference
counting
From: David Stevens
Avoid converting pfns returned by follow_fault_pfn to struct pages to
transiently take a reference. The reference was originally taken to
match the reference taken by gup. However, pfns returned by
follow_fault_pfn may not have a struct page set up for reference
counting
From: David Stevens
Return a struct kvm_pfn_page containing both a pfn and an optional
struct page from the gfn_to_pfn family of functions. This differentiates
the gup and follow_fault_pfn cases, which allows callers that only need
a pfn to avoid touching the page struct in the latter case
From: David Stevens
Signed-off-by: David Stevens
---
arch/x86/kvm/mmu/mmu_audit.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/x86/kvm/mmu/mmu_audit.c b/arch/x86/kvm/mmu/mmu_audit.c
index cedc17b2f60e..97ff184084b4 100644
--- a/arch/x86/kvm/mmu/mmu_audit.c
+++ b/arch/x86/kvm/mmu
and arm64.
David Stevens (6):
KVM: x86/mmu: release audited pfns
KVM: mmu: also return page from gfn_to_pfn
KVM: x86/mmu: avoid struct page in MMU
KVM: arm64/mmu: avoid struct page in MMU
KVM: mmu: remove over-aggressive warnings
drm/i915/gvt: use gfn_to_pfn's page instead of pfn
arch
Stephen Hemminger [EMAIL PROTECTED] wrote on 08/24/2007
08:52:03 AM:
You need hardware support for deferred interrupts. Most devices have it
(e1000, sky2, tg3)
and it interacts well with NAPI. It is not a generic thing you want done
by the stack,
you want the hardware to hold off
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