From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Sean Christopherson" <sean.j.christopherson@intel.com>,
"Vitaly Kuznetsov" <vkuznets@redhat.com>,
"Wanpeng Li" <wanpengli@tencent.com>,
"Jim Mattson" <jmattson@google.com>,
"Joerg Roedel" <joro@8bytes.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"Borislav Petkov" <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org
Subject: KVM: x86: Pass additional FPU bits to the guest
Date: Wed, 25 Sep 2019 23:37:19 +0200 [thread overview]
Message-ID: <20190925213721.21245-1-bigeasy@linutronix.de> (raw)
While testing my FPU patches on AMD's ZEN platform I noticed that the
XSAVES feature flag was never used in the guest while it was present in
the host. Patch #1 seemed to work but I holded on to it because I could
explain why the guest did report ´fxsave_leak' while the host did not.
It turns out that I need #2 _and_ tell qemu not to mask this information
away.
Sebastian
next reply other threads:[~2019-09-25 21:37 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-25 21:37 Sebastian Andrzej Siewior [this message]
2019-09-25 21:37 ` [PATCH 1/2] KVM: x86: svm: Pass XSAVES to guest if available on host Sebastian Andrzej Siewior
2019-09-25 22:14 ` Jim Mattson
2019-09-25 21:37 ` [PATCH 2/2] KVM: x86: Expose CLZERO and XSAVEERPTR to the guest Sebastian Andrzej Siewior
2019-09-25 22:10 ` Jim Mattson
2019-09-26 11:12 ` Paolo Bonzini
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