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From: "Tian, Kevin" <kevin.tian@intel.com>
To: Jan Beulich <jbeulich@suse.com>,
	"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>,
	Paul Durrant <Paul.Durrant@citrix.com>,
	"Nakajima, Jun" <jun.nakajima@intel.com>, Wei Liu <wl@xen.org>,
	Roger Pau Monne <roger.pau@citrix.com>
Subject: Re: [Xen-devel] [PATCH v5 09/10] x86/HVM: don't needlessly intercept APERF/MPERF/TSC MSR reads
Date: Fri, 27 Mar 2020 02:24:32 +0000
Message-ID: <AADFC41AFE54684AB9EE6CBC0274A5D19D7ECA39@SHSMSX104.ccr.corp.intel.com> (raw)
In-Reply-To: <ca9aa4cc-7164-54bb-fc33-9c049be51352@suse.com>

> From: Jan Beulich <jbeulich@suse.com>
> Sent: Tuesday, March 24, 2020 8:37 PM
> 
> If the hardware can handle accesses, we should allow it to do so. This
> way we can expose EFRO to HVM guests, and "all" that's left for exposing
> APERF/MPERF is to figure out how to handle writes to these MSRs. (Note
> that the leaf 6 guest CPUID checks will evaluate to false for now, as
> recalculate_misc() zaps the entire leaf for now.)
> 
> For TSC the intercepts are made mirror the RDTSC ones.
> 
> Signed-off-by: Jan Beulich <jbeulich@suse.com>

Reviewed-by: Kevin Tian <kevin.tian@intel.com>

  reply index

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-24 12:26 [Xen-devel] [PATCH v5 00/10] x86emul: further work Jan Beulich
2020-03-24 12:29 ` [Xen-devel] [PATCH v5 02/10] x86emul: support AVX512_BF16 insns Jan Beulich
2020-03-24 12:29 ` [Xen-devel] [PATCH v5 02/10] x86emul: support MOVDIRI insn Jan Beulich
2020-03-25 20:58   ` Andrew Cooper
2020-03-26  9:20     ` Jan Beulich
2020-03-24 12:30 ` [Xen-devel] [PATCH v5 01/10] x86emul: support AVX512_BF16 insns Jan Beulich
2020-03-25 20:02   ` Andrew Cooper
2020-03-27 18:20   ` Andrew Cooper
2020-03-30  6:40     ` Jan Beulich
2020-03-24 12:33 ` [Xen-devel] [PATCH v5 03/10] x86: determine HAVE_AS_* just once Jan Beulich
2020-03-25 21:12   ` Andrew Cooper
2020-03-26  9:50     ` Jan Beulich
2020-03-26 13:42       ` Anthony PERARD
2020-03-26 14:20         ` Jan Beulich
2020-03-24 12:33 ` [Xen-devel] [PATCH v5 04/10] x86: move back clang no integrated assembler tests Jan Beulich
2020-03-24 12:34 ` [Xen-devel] [PATCH v5 05/10] x86emul: support MOVDIR64B insn Jan Beulich
2020-03-25 11:19   ` Paul Durrant
2020-03-25 11:46     ` Jan Beulich
2020-04-02 23:12   ` Andrew Cooper
2020-03-24 12:34 ` [Xen-devel] [PATCH v5 06/10] x86emul: support ENQCMD insn Jan Beulich
2020-03-24 12:35 ` [Xen-devel] [PATCH v5 07/10] x86/HVM: scale MPERF values reported to guests (on AMD) Jan Beulich
2020-03-24 12:36 ` [Xen-devel] [PATCH v5 08/10] x86emul: support RDPRU Jan Beulich
2020-03-24 12:37 ` [Xen-devel] [PATCH v5 09/10] x86/HVM: don't needlessly intercept APERF/MPERF/TSC MSR reads Jan Beulich
2020-03-27  2:24   ` Tian, Kevin [this message]
2020-03-24 12:37 ` [Xen-devel] [PATCH v5 10/10] x86emul: support MCOMMIT Jan Beulich
2020-03-24 12:43 ` [Xen-devel] [PATCH v5 00/10] x86emul: further work Jan Beulich
2020-03-25 10:59   ` Paul Durrant
2020-03-25 11:41 ` Andrew Cooper
2020-03-25 11:45   ` Jan Beulich
2020-03-26 11:49 ` Jan Beulich

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