linux-kernel - [PATCH 0/2] VMSCAPE optimization for BHI variant

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Message-ID: <20250924-vmscape-bhb-v1-0-da51f0e1934d@linux.intel.com>
Date: Mon, 29 Sep 2025 07:12:03 +0200
From: Jack Wang <jinpu.wang@...os.com>
To: pawan.kumar.gupta@...ux.intel.com,
	x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	David Kaplan <david.kaplan@....com>,
	Sean Christopherson <seanjc@...gle.com>,
	Paolo Bonzini <pbonzini@...hat.com>
Cc: asit.k.mallick@...el.com,
	kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	tao1.zhang@...el.com
Subject: [PATCH 0/2] VMSCAPE optimization for BHI variant

From: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>

Hi Pawan,

Thx for the patches, I tested them on our Intel SierraForest machine with fio
4k randread/randwrite from guest, qemu virtio-blk, noticed nice performance
improvement comparing to the default IBPB before exit to userspace mitigation.
eg with default IBPB mitigation fio gets 204k IOPS, with this new Clear BHB before exit to userspace 
gets 323k IOPS.

Thx!