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See http://www.infradead.org/rpr.html X-Stat-Signature: oc96f7wk4zyhx1t7cesw9hahmdq7s5wc X-Rspamd-Queue-Id: E975518001F X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1720535808-600202 X-HE-Meta: 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 MfQH1DDq 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 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: --=-5vEUUU1+LXvqzP8i4LoY Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2024-07-09 at 14:20 +0100, Patrick Roy wrote: > KVM uses gfn_to_pfn_caches to cache translations from gfn all the way to > the pfn (for example, kvm-clock caches the page storing the page used > for guest/host communication this way). Unlike the gfn_to_hva_cache, > where no equivalent caching semantics were possible to gmem-backed gfns > (see also 858e8068a750 ("kvm: pfncache: enlighten about gmem")), here it > is possible to simply cache the pfn returned by `kvm_gmem_get_pfn`. >=20 > Additionally, gfn_to_pfn_caches now invalidate whenever a cached gfn's > attributes are flipped from shared to private (or vice-versa). >=20 > Signed-off-by: Patrick Roy I can't see how this is safe from race conditions. When the GPC is invalidated from gfn_to_pfn_cache_invalidate_start() its *write* lock is taken and gpc->valid is set to false. In parallel, any code using the GPC to access guest memory will take the *read* lock, call kvm_gpc_check(), and then go ahead and use the pointer to its heart's content until eventually dropping the read lock. Since invalidation takes the write lock, it has to wait until the GPC is no longer in active use, and the pointer cannot be being dereferenced. How does this work for the kvm_mem_is_private() check. You've added a check in kvm_gpc_check(), but what if the pfn is made private immediately *after* that check? Unless the code path which makes the pfn private also takes the write lock, how is it safe? --=-5vEUUU1+LXvqzP8i4LoY Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf 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