Messages in this thread | | | Date | Tue, 23 May 2023 15:43:15 -0700 | Subject | Re: [PATCH v6 2/6] x86/tdx: Support vmalloc() for tdx_enc_status_changed() | From | Dave Hansen <> |
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On 5/23/23 15:37, kirill.shutemov@linux.intel.com wrote: >> How does this work with load_unaligned_zeropad()? Couldn't it be >> running around poking at one of these vmalloc()'d pages via the direct >> map during a shared->private conversion before the page has been accepted? > Alias processing in __change_page_attr_set_clr() will change direct > mapping if you call it on vmalloc()ed memory. I think we are safe wrt > load_unaligned_zeropad() here.
We're *eventually* OK:
> /* Notify hypervisor that we are about to set/clr encryption attribute. */ > x86_platform.guest.enc_status_change_prepare(addr, numpages, enc); > > ret = __change_page_attr_set_clr(&cpa, 1);
But what about in the middle between enc_status_change_prepare() and __change_page_attr_set_clr()? Don't the direct map and the shared/private status of the page diverge in there?
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