From: Thomas Gleixner <tglx@linutronix.de>
To: "Thomas Hellström (VMware)" <thomas_os@shipmail.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
linux-kernel@vger.kernel.org, pv-drivers@vmware.com,
Thomas Hellstrom <thellstrom@vmware.com>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, Doug Covelli <dcovelli@vmware.com>
Subject: Re: [PATCH 2/4] x86/vmware: Add a header file for hypercall definitions
Date: Tue, 20 Aug 2019 15:42:57 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.21.1908201540400.2223@nanos.tec.linutronix.de> (raw)
In-Reply-To: <597132a4-2514-2f13-5786-b423d82b7fd4@shipmail.org>
[-- Attachment #1: Type: text/plain, Size: 1013 bytes --]
On Tue, 20 Aug 2019, Thomas Hellström (VMware) wrote:
> On 8/20/19 1:32 PM, Peter Zijlstra wrote:
> > On Sun, Aug 18, 2019 at 04:33:14PM +0200, Thomas Hellström (VMware) wrote:
> >
> > > +#define VMWARE_HYPERCALL \
> > > + ALTERNATIVE_2(".byte 0xed", \
> > > + ".byte 0x0f, 0x01, 0xc1", X86_FEATURE_VMW_VMCALL, \
> > > + ".byte 0x0f, 0x01, 0xd9", X86_FEATURE_VMW_VMMCALL)
> > For sanity, could we either add comments, or macros for those
> > instrucions?
>
> Hmm. Here I followed and slightly extended what was done in asm/kvm_para.h.
>
> What confuses me a bit is, if it's clarity we're after, why don't people use
>
> #define VMWARE_HYPERCALL \
> ALTERNATIVE_2("inl (%%dx)", \
> "vmcall", X86_FEATURE_VMW_VMCALL, \
> "vmmcall", X86_FEATURE_VMW_VMMCALL)
>
> Seems to build fine here. Is it fear of old assemblers not supporting, for
> example vmmcall
The requirement for binutils is version >= 2.21. If 2.21 supports vmcall and
vmmcall all good.
Thanks,
tglx
next prev parent reply other threads:[~2019-08-20 13:43 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-18 14:33 [PATCH 0/4] Add support for updated vmware hypercall instruction Thomas Hellström (VMware)
2019-08-18 14:33 ` [PATCH 1/4] x86/vmware: Update platform detection code for VMCALL/VMMCALL hypercalls Thomas Hellström (VMware)
2019-08-18 19:20 ` Thomas Gleixner
2019-08-18 19:46 ` Thomas Hellström (VMware)
2019-08-20 17:18 ` [Pv-drivers] " Darren Hart
2019-08-18 14:33 ` [PATCH 2/4] x86/vmware: Add a header file for hypercall definitions Thomas Hellström (VMware)
2019-08-18 20:19 ` Borislav Petkov
2019-08-18 20:39 ` Borislav Petkov
2019-08-18 22:28 ` Thomas Hellström (VMware)
2019-08-19 6:25 ` Borislav Petkov
2019-08-19 7:49 ` Thomas Hellström (VMware)
2019-08-20 11:32 ` Peter Zijlstra
2019-08-20 13:34 ` Thomas Hellström (VMware)
2019-08-20 13:42 ` Thomas Gleixner [this message]
2019-08-20 19:19 ` Thomas Hellström (VMware)
2019-08-20 19:23 ` Thomas Gleixner
2019-08-18 14:33 ` [PATCH 3/4] drm/vmwgfx: Update the backdoor call with support for new instructions Thomas Hellström (VMware)
2019-08-18 14:33 ` [PATCH 4/4] input/vmmouse: " Thomas Hellström (VMware)
2019-08-21 5:09 ` Dmitry Torokhov
2019-08-21 15:48 ` Thomas Hellström (VMware)
2019-08-21 16:03 ` Dmitry Torokhov
2019-08-18 18:09 ` [PATCH 0/4] Add support for updated vmware hypercall instruction Borislav Petkov
2019-08-18 19:02 ` Thomas Hellström (VMware)
2019-08-18 19:37 ` Borislav Petkov
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