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Mon, 18 May 2026 07:40:46 -0700 (PDT) X-Received: by 2002:a05:600c:8906:b0:48f:e3e7:3d39 with SMTP id 5b1f17b1804b1-48fe5fdd63fmr183175705e9.11.1779115245758; Mon, 18 May 2026 07:40:45 -0700 (PDT) Received: from imammedo ([213.175.46.86]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48fe4c8344asm444206845e9.1.2026.05.18.07.40.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 May 2026 07:40:45 -0700 (PDT) Date: Mon, 18 May 2026 16:40:44 +0200 From: Igor Mammedov To: Sean Christopherson Cc: kvm@vger.kernel.org, pbonzini@redhat.com, babu.moger@amd.com Subject: Re: [kvm-unit-tests PATCH] x86/svm: work around Virtual VMLOAD/VMSAVE bug on Naples and Rome Message-ID: <20260518164044.5f06f840@imammedo> In-Reply-To: References: <20260515111957.4188366-1-imammedo@redhat.com> <20260518143255.3795625a@imammedo> X-Mailer: Claws Mail 4.4.0 (GTK 3.24.52; x86_64-redhat-linux-gnu) Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Mon, 18 May 2026 07:30:14 -0700 Sean Christopherson wrote: > On Mon, May 18, 2026, Igor Mammedov wrote: > > On Fri, 15 May 2026 05:44:37 -0700 > > Sean Christopherson wrote: > > > > +static bool has_vls_bug(void) > > > > > > Probably need to be more specific, because there appear to be multiple flavors > > > of vls bugs. :-/ > > > > > > would something like this work: > > > > -static bool has_vls_bug(void) > > +/* > > + * Naples (Fam17h/00-0f) and Rome (Fam17h/30-3f) cause spurious VMEXITs > > + * on VMLOAD/VMSAVE when the VMCB address falls in [0x78000000, 0x80000000). > > + */ > > +static bool has_vls_spurious_vmexit_bug(void) > > Works for me. Any chance you have a specific erratum number that we could reference? I'll try to find it. That's also was a reason to cc AMD side, for they probably know better where/what to look for. >