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 JrGprkPc BFVLf8iacoowbhkrIRDzTI6nyQVGNna4vR9kSF2y/wlDqd+D/lET7kSmgcuXxI/IygKVdwMwn4LY8a2i+jCZQoUH4b+PRbX7cdRgEkD1E2Ug1GrT/DJGYMeZNin5/o+BV5i+FInb+5d7uDvvsD/6FzYPWLqEnGvGZZxrB3Iak9ie8akoSmmkq3GqZpoE3XfhqSPBjw8ztCdRbxuroq9LA198TVovzfk3wTQ4JMcrkfsawgRbYotLLwPAwdUn+S1wUarJoMjduMHbjP1PIaIUVxuFbVJmo7pj7yt8G5nlN9JRK4Brlbvta02r1IDfjiVm+hn61+haYG7BjBvfXX+EdWQ5hgp+UDiDA7ezbwS2uruUn/F5TdrVjpbqhoGzrQ+9OiU3gmk2QXaVBv3Ntlp8+R3i4JEhW2/lOlqH+31ecvK3TiO6aaPUB27WTWg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2/28/25 09:02, Tom Lendacky wrote: > On 2/27/25 19:13, Rik van Riel wrote: >> On Wed, 2025-02-26 at 12:12 -0600, Tom Lendacky wrote: >>> >>> As long as you keep the ASID value in EDX[15:0] as 0, then you won't >>> #GP. ASID 0 is the host/hypervisor. An ASID > 0 belongs to a guest. >>> >> I've been spending some time reading the KVM code, >> and I don't think invlpgb would be currently useful >> with KVM. >> >> From reading pre_svm_run(), new_asid(), and svm_vcpu_run(), >> it looks like the ASID number used might be different for >> each VCPU, assigned on a per (physical host) CPU basis. >> >> It would take some surgery to change that around. >> >> Some googling around also suggests that the ASID address >> space is even more limited than the PCID address space :( > > Right, to support using INVLPGB in guests you need a global ASID, which is > an ASID that doesn't change over the VMs lifetime and is used on all > vCPUs. Global ASIDs are only available and used today with SEV guests. At > that point you would not intercept the instruction and, based on APM vol > 3, the ASID value is replaced with the guest ASID value. > > "A guest that executes a legal INVLPGB that is not intercepted will have > the requested ASID field replaced by the current ASID and the valid ASID > bit set before doing the broadcast invalidation." > > So I'm in the process of verifying that issuing INVLPLG in a guest with > the ASID valid bit set and an ASID value of 0 (EDX[15:0]) won't #GP, but > will just replace the specified ASID value with the guest ASID value in > hardware. I verified that when (a non-intercepted) INVLPGB is issued in a guest, hardware will set the ASID valid bit and use the guest ASID value (regardless of the value specified in EDX[15:0]) before doing the broadcast invalidation. So the implementation of setting the ASID-valid bit and specifying ASID 0 is not incompatible in the guest. Thanks, Tom > > For non-SEV guests, INVLPGB would need to be intercepted and somehow > emulated or just not advertised to the guest so that the IPI path is used. > > Thanks, > Tom > >>