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Wed, 26 Mar 2025 18:55:57 -0700 (PDT) Date: Wed, 26 Mar 2025 18:55:55 -0700 In-Reply-To: Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250317-kvm_exit_fix-v1-1-aa5240c5dbd2@rivosinc.com> Message-ID: Subject: Re: [PATCH] RISC-V: KVM: Teardown riscv specific bits after kvm_exit From: Sean Christopherson To: Atish Kumar Patra Cc: Anup Patel , Atish Patra , Paul Walmsley , Palmer Dabbelt , Alexandre Ghiti , Andrew Jones , Anup Patel , kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable On Thu, Mar 20, 2025, Atish Kumar Patra wrote: > On Mon, Mar 17, 2025 at 9:08=E2=80=AFAM Sean Christopherson wrote: > > On Mon, Mar 17, 2025, Atish Patra wrote: > > > arch/riscv/kvm/main.c | 4 ++-- > > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > > > diff --git a/arch/riscv/kvm/main.c b/arch/riscv/kvm/main.c > > > index 1fa8be5ee509..4b24705dc63a 100644 > > > --- a/arch/riscv/kvm/main.c > > > +++ b/arch/riscv/kvm/main.c > > > @@ -172,8 +172,8 @@ module_init(riscv_kvm_init); > > > > > > static void __exit riscv_kvm_exit(void) > > > { > > > - kvm_riscv_teardown(); > > > - > > > kvm_exit(); > > > + > > > + kvm_riscv_teardown(); > > > > I wonder if there's a way we can guard against kvm_init()/kvm_exit() be= ing called > > too early/late. x86 had similar bugs for a very long time, e.g. see co= mmit > > e32b120071ea ("KVM: VMX: Do _all_ initialization before exposing /dev/k= vm to userspace"). > > > > E.g. maybe we do something like create+destroy a VM at the end of kvm_i= nit() and > > the beginning of kvm_exit()? Not sure if that would work for kvm_exit(= ), but it > > should definitely be fine for kvm_init(). > > > Yes. That would be super useful. I am not sure about the exact > mechanism to achieve that though. Me either :-) > Do you just test code guarded within a new config that just > creates/destroys a dummy VM ? That's only idea I could come up with too, but I don't particulary like it. > May be kunit test for KVM fits here in some way ? I don't think a kunit test would be a good fit, there are likely too many dependencies, and I'm pretty sure we'd still need to hack KVM. 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Wed, 26 Mar 2025 18:55:57 -0700 (PDT) Date: Wed, 26 Mar 2025 18:55:55 -0700 In-Reply-To: Mime-Version: 1.0 References: <20250317-kvm_exit_fix-v1-1-aa5240c5dbd2@rivosinc.com> Message-ID: Subject: Re: [PATCH] RISC-V: KVM: Teardown riscv specific bits after kvm_exit From: Sean Christopherson To: Atish Kumar Patra Cc: Anup Patel , Atish Patra , Paul Walmsley , Palmer Dabbelt , Alexandre Ghiti , Andrew Jones , Anup Patel , kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250326_185559_461261_84200FC5 X-CRM114-Status: GOOD ( 23.47 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org T24gVGh1LCBNYXIgMjAsIDIwMjUsIEF0aXNoIEt1bWFyIFBhdHJhIHdyb3RlOgo+IE9uIE1vbiwg TWFyIDE3LCAyMDI1IGF0IDk6MDjigK9BTSBTZWFuIENocmlzdG9waGVyc29uIDxzZWFuamNAZ29v Z2xlLmNvbT4gd3JvdGU6Cj4gPiBPbiBNb24sIE1hciAxNywgMjAyNSwgQXRpc2ggUGF0cmEgd3Jv dGU6Cj4gPiA+ICBhcmNoL3Jpc2N2L2t2bS9tYWluLmMgfCA0ICsrLS0KPiA+ID4gIDEgZmlsZSBj aGFuZ2VkLCAyIGluc2VydGlvbnMoKyksIDIgZGVsZXRpb25zKC0pCj4gPiA+Cj4gPiA+IGRpZmYg LS1naXQgYS9hcmNoL3Jpc2N2L2t2bS9tYWluLmMgYi9hcmNoL3Jpc2N2L2t2bS9tYWluLmMKPiA+ ID4gaW5kZXggMWZhOGJlNWVlNTA5Li40YjI0NzA1ZGM2M2EgMTAwNjQ0Cj4gPiA+IC0tLSBhL2Fy Y2gvcmlzY3Yva3ZtL21haW4uYwo+ID4gPiArKysgYi9hcmNoL3Jpc2N2L2t2bS9tYWluLmMKPiA+ ID4gQEAgLTE3Miw4ICsxNzIsOCBAQCBtb2R1bGVfaW5pdChyaXNjdl9rdm1faW5pdCk7Cj4gPiA+ Cj4gPiA+ICBzdGF0aWMgdm9pZCBfX2V4aXQgcmlzY3Zfa3ZtX2V4aXQodm9pZCkKPiA+ID4gIHsK PiA+ID4gLSAgICAga3ZtX3Jpc2N2X3RlYXJkb3duKCk7Cj4gPiA+IC0KPiA+ID4gICAgICAga3Zt X2V4aXQoKTsKPiA+ID4gKwo+ID4gPiArICAgICBrdm1fcmlzY3ZfdGVhcmRvd24oKTsKPiA+Cj4g PiBJIHdvbmRlciBpZiB0aGVyZSdzIGEgd2F5IHdlIGNhbiBndWFyZCBhZ2FpbnN0IGt2bV9pbml0 KCkva3ZtX2V4aXQoKSBiZWluZyBjYWxsZWQKPiA+IHRvbyBlYXJseS9sYXRlLiAgeDg2IGhhZCBz aW1pbGFyIGJ1Z3MgZm9yIGEgdmVyeSBsb25nIHRpbWUsIGUuZy4gc2VlIGNvbW1pdAo+ID4gZTMy YjEyMDA3MWVhICgiS1ZNOiBWTVg6IERvIF9hbGxfIGluaXRpYWxpemF0aW9uIGJlZm9yZSBleHBv c2luZyAvZGV2L2t2bSB0byB1c2Vyc3BhY2UiKS4KPiA+Cj4gPiBFLmcuIG1heWJlIHdlIGRvIHNv bWV0aGluZyBsaWtlIGNyZWF0ZStkZXN0cm95IGEgVk0gYXQgdGhlIGVuZCBvZiBrdm1faW5pdCgp IGFuZAo+ID4gdGhlIGJlZ2lubmluZyBvZiBrdm1fZXhpdCgpPyAgTm90IHN1cmUgaWYgdGhhdCB3 b3VsZCB3b3JrIGZvciBrdm1fZXhpdCgpLCBidXQgaXQKPiA+IHNob3VsZCBkZWZpbml0ZWx5IGJl IGZpbmUgZm9yIGt2bV9pbml0KCkuCj4gPgo+IFllcy4gVGhhdCB3b3VsZCBiZSBzdXBlciB1c2Vm dWwuIEkgYW0gbm90IHN1cmUgYWJvdXQgdGhlIGV4YWN0Cj4gbWVjaGFuaXNtIHRvIGFjaGlldmUg dGhhdCB0aG91Z2guCgpNZSBlaXRoZXIgOi0pCgo+IERvIHlvdSBqdXN0IHRlc3QgY29kZSBndWFy ZGVkIHdpdGhpbiBhIG5ldyBjb25maWcgdGhhdCBqdXN0Cj4gY3JlYXRlcy9kZXN0cm95cyBhIGR1 bW15IFZNID8KClRoYXQncyBvbmx5IGlkZWEgSSBjb3VsZCBjb21lIHVwIHdpdGggdG9vLCBidXQg SSBkb24ndCBwYXJ0aWN1bGFyeSBsaWtlIGl0LgoKPiBNYXkgYmUga3VuaXQgdGVzdCBmb3IgS1ZN IGZpdHMgaGVyZSBpbiBzb21lIHdheSA/CgpJIGRvbid0IHRoaW5rIGEga3VuaXQgdGVzdCB3b3Vs ZCBiZSBhIGdvb2QgZml0LCB0aGVyZSBhcmUgbGlrZWx5IHRvbyBtYW55CmRlcGVuZGVuY2llcywg YW5kIEknbSBwcmV0dHkgc3VyZSB3ZSdkIHN0aWxsIG5lZWQgdG8gaGFjayBLVk0uCgpfX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1yaXNjdiBtYWls aW5nIGxpc3QKbGludXgtcmlzY3ZAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5m cmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LXJpc2N2Cg==