[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH 00/14] target-i386: Implement MPX extension
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH 00/14] target-i386: Implement MPX extension |
Date: |
Tue, 17 Nov 2015 18:43:55 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
On 09/07/2015 10:17, Richard Henderson wrote:
> I'm still in the process of testing this, as there's no code
> written for it yet and hardware to compare against doesn't
> start shipping until (probably) August.
>
> But in the meantime there are a number of holes that I found
> in XSAVE support that might affect KVM, and one question wrt
> SMM support that affects MPX. So I thought I'd get some
> feedback on this sooner than later.
>
> This patch set depends on the addressing cleanup patchset that
> I just posted. It ought to depend on Pavel Dovgalyuk's exception
> handling cleanup patchset, but I haven't included that in my tree.
>
> Comments?
Hi Richard, it would be nice to have these patches---or at least the
XSAVE support---in 2.6. I also have a PKRU implementation for TCG, but
currently I'm only implementing RDPKRU/WRPKRU because I would like to
build the XSAVE support on top of your patches.
Regarding SMM support, there are three ways to go:
1) pester Intel some more so that they disclose the format of the SMM
state save area;
2) just place BNDCFGS at a random offset that is left as reserved in
AMD's manual;
3) do not save BNDCFGS at all since no one uses it anyway. *shrug*
The holes in the computation of KVM's hflags are probably harmless, but
nice to have anyway. Thanks for fixing them. Are there others that I
missed?
Paolo
- Re: [Qemu-devel] [PATCH 00/14] target-i386: Implement MPX extension,
Paolo Bonzini <=