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6:53 PM Yan Zhao wrote: > > > > On Sun, Nov 30, 2025 at 05:35:41PM -0800, Vishal Annapurve wrote: > > > On Mon, Nov 24, 2025 at 7:15 PM Yan Zhao wrote: > > > > > > > @@ -889,7 +872,7 @@ long kvm_gmem_populate(struct kvm *kvm, gfn_t start_gfn, void __user *src, long > > > > > > > p = src ? src + i * PAGE_SIZE : NULL; > > > > > > > ret = post_populate(kvm, gfn, pfn, p, max_order, opaque); > > > > > > > if (!ret) > > > > > > > - kvm_gmem_mark_prepared(folio); > > > > > > > + folio_mark_uptodate(folio); > > > > > > As also asked in [1], why is the entire folio marked as uptodate here? Why does > > > > > > kvm_gmem_get_pfn() clear all pages of a huge folio when the folio isn't marked > > > > > > uptodate? > > > > > > > > > > Quoting your example from[1] for more context: > > > > > > > > > > > I also have a question about this patch: > > > > > > > > > > > > Suppose there's a 2MB huge folio A, where > > > > > > A1 and A2 are 4KB pages belonging to folio A. > > > > > > > > > > > > (1) kvm_gmem_populate() invokes __kvm_gmem_get_pfn() and gets folio A. > > > > > > It adds page A1 and invokes folio_mark_uptodate() on folio A. > > > > > > > > > > In SNP hugepage patchset you responded to, it would only mark A1 as > > > > You mean code in > > > > https://github.com/amdese/linux/commits/snp-inplace-conversion-rfc1 ? > > > > > > > > > prepared/cleared. There was 4K-granularity tracking added to handle this. > > > > I don't find the code that marks only A1 as "prepared/cleared". > > > > Instead, I just found folio_mark_uptodate() is invoked by kvm_gmem_populate() > > > > to mark the entire folio A as uptodate. > > > > > > > > However, according to your statement below that "uptodate flag only tracks > > > > whether a folio has been cleared", I don't follow why and where the entire folio > > > > A would be cleared if kvm_gmem_populate() only adds page A1. > > > > > > I think kvm_gmem_populate() is currently only used by SNP and TDX > > > logic, I don't see an issue with marking the complete folio as > > > uptodate even if its partially updated by kvm_gmem_populate() paths as > > > the private memory will eventually get initialized anyways. > > Still using the above example, > > If only page A1 is passed to sev_gmem_post_populate(), will SNP initialize the > > entire folio A? > > - if yes, could you kindly point me to the code that does this? . > > - if sev_gmem_post_populate() only initializes page A1, after marking the > > complete folio A as uptodate in kvm_gmem_populate(), later faulting in page A2 > > in kvm_gmem_get_pfn() will not clear page A2 by invoking clear_highpage(), > > since the entire folio A is uptodate. I don't understand why this is OK. > > Or what's the purpose of invoking clear_highpage() on other folios? > > I think sev_gmem_post_populate() only initializes the ranges marked > for snp_launch_update(). Since the current code lacks a hugepage > provider, the kvm_gmem_populate() doesn't need to explicitly clear > anything for 4K backings during kvm_gmem_populate(). > > I see your point. Once a hugepage provider lands, kvm_gmem_populate() > can first invoke clear_highpage() or an equivalent API on a complete > huge folio before calling the architecture-specific post-populate hook > to keep the implementation consistent. Maybe clear_highpage() in kvm_gmem_get_folio()? When in-place copy in kvm_gmem_populate() comes, kvm_gmem_get_folio() can be invoked first for shared memory, so clear_highpage() there is before userspace writes to shared memory. No clear_highpage() is required when kvm_gmem_populate() invokes __kvm_gmem_get_pfn() to get the folio again. > Subsequently, we need to figure out a way to avoid this clearing for > SNP/TDX/CCA private faults. > > > > > Thanks > > Yan