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 0/De1kf6 VFf9XQPLz26sO7/fSPpFKyIxghwH94+Da0d1MouoButUVxRALj2yAQVrPbmF06rrLAzlxvdzK+IDYSSrNh2WeeVUZrswQcu2gmvaehhC1aILfTHUpIvnBLL/agQZmEUyGKuetqHQ6/MVL/yKa/MehA3InTE8zJ3TrKSgBbcNDmjrZKfTCPxl+jj+iBSJNGjUaS7CKa76vjY9xei93m8gf+wVuRXBtdSxW4vVJqXlgMYmE5qNFEsXXf9unmbuUco9b9vNeZFdDxJ+Bh7oOcJlBZ96FX5vXA8xgoacV86k3VIkWw4NFgutsBRZSTTZEPl3DKokcirsbzGDdGuS7Htzz983cBNZm5ZBVE2HJx6+IkJG9UWlxl5OqBmpWcbjc3jvDeuKgp9vOI/kSzuQ= 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 1/14/25 09:47, Rik van Riel wrote: > On Tue, 2025-01-14 at 09:23 -0600, Tom Lendacky wrote: >> On 1/14/25 09:05, Dave Hansen wrote: >>> On 1/14/25 06:29, Tom Lendacky wrote: >>>>> Given the choice between "a bug in the calling code >>>>> crashes the kernel" and "a bug in the calling code >>>>> results in a missed TLB flush", I'm guessing the >>>>> crash is probably better. >>>> So instead of the negative number protection, shouldn't this just >>>> use an >>>> unsigned int for extra_count and panic() if the value is greater >>>> than >>>> invlpgb_count_max? The caller has some sort of logic problem and >>>> it >>>> could possibly result in missed TLB flushes. Or if a panic() is >>>> out of >>>> the question, maybe a WARN() and a full TLB flush to be safe? >>> >>> The current implementation will panic in the #GP handler though. It >>> should be pretty easy to figure out that INVLPGB is involved with >>> RIP or >>> the Code: snippet. From there, you'd need to figure out what caused >>> the #GP. >> >> Hmmm, maybe I'm missing something. IIUC, when a negative number is >> supplied, the extra_count field will be set to 0 (via the max() >> function) and allow the INVLPGB to continue. 0 is valid in ECX[15:0] >> and >> so the instruction won't #GP. > > I added that at the request of somebody else :) > > Let me remove it again, now that we seem to have a > consensus that a panic is preferable to a wrong > TLB flush. I believe the instruction will #GP if any of the ECX[30:16] reserved bits are non-zero (although the APM doesn't document that), in addition to ECX[15:0] being greater than allowed. But what if 0x80000000 is passed in. That would set ECX[31] with a zero count field, which is valid for the instruction, but the input is obviously bogus. I think the safest thing to do is make the extra_count parameter an unsigned int and check if it is greater than invlpgb_count_max. Not sure what to actually do at that point, though... panic()? WARN() with full TLB flush? Thanks, Tom >