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Date: Fri, 1 Oct 2021 20:33:58 -0400 From: Boris Ostrovsky <boris.ostrovsky@...cle.com> To: Jan Beulich <jbeulich@...e.com>, Juergen Gross <jgross@...e.com> Cc: Stefano Stabellini <sstabellini@...nel.org>, lkml <linux-kernel@...r.kernel.org>, "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org> Subject: Re: [PATCH 0/6] xen/x86: PV boot speedup On 9/30/21 8:33 AM, Jan Beulich wrote: > The observed (by the human eye) performance difference of early boot > between native and PV-on-Xen was just too large to not look into. As > it turns out, gaining performance back wasn't all that difficult. > > While the series (re)introduces a small number of PTWR emulations on > the boot path (from phys_pte_init()), there has been a much larger > number of them post-boot. Hence I think if this was of concern, the > post-boot instances would want eliminating first. > > Some of the later changes aren'r directly related to the main goal of > the series; these address aspects noticed while doing the investigation. > > 1: streamline set_pte_mfn() > 2: restore (fix) xen_set_pte_init() behavior > 3: adjust xen_set_fixmap() > 4: adjust handling of the L3 user vsyscall special page table > 5: there's no highmem anymore in PV mode > 6: restrict PV Dom0 identity mapping For the series: Reviewed-by: Boris Ostrovsky <boris.ostrovksy@...cle.com>
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