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Mon, 23 Jun 2025 03:04:31 -0700 (PDT) Received: from localhost ([2a02:8308:a00c:e200:8947:973b:de:93b7]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a6d0f19f9esm9077130f8f.39.2025.06.23.03.04.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 Jun 2025 03:04:31 -0700 (PDT) Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Mon, 23 Jun 2025 12:04:30 +0200 Message-Id: Subject: Re: [External] Re: [PATCH] RISC-V: KVM: Delegate illegal instruction fault Cc: , , , , , , , , , , "linux-riscv" To: "Xu Lu" From: =?utf-8?q?Radim_Kr=C4=8Dm=C3=A1=C5=99?= References: <20250620091720.85633-1-luxu.kernel@bytedance.com> In-Reply-To: 2025-06-22T18:11:49+08:00, Xu Lu : > Hi Radim, > > On Fri, Jun 20, 2025 at 8:04=E2=80=AFPM Radim Kr=C4=8Dm=C3=A1=C5=99 wrote: >> >> 2025-06-20T17:17:20+08:00, Xu Lu : >> > Delegate illegal instruction fault to VS mode in default to avoid such >> > exceptions being trapped to HS and redirected back to VS. >> > >> > Signed-off-by: Xu Lu >> > --- >> > diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/as= m/kvm_host.h >> > @@ -48,6 +48,7 @@ >> > + BIT(EXC_INST_ILLEGAL) | \ >> >> You should also remove the dead code in kvm_riscv_vcpu_exit. > > I only want to delegate it by default. And KVM may still want to > delegate different exceptions for different VMs like what it does for > EXC_BREAKPOINT. (I think we could easily reintroduce the code if KVM wants to do that in the future. I also think that it's bad that this patch is doing an observable change without userspace involvement -- the counting of KVM SBI PMU events, but others will probably disagree with me on this.) > So maybe it is better to reserve these codes? Possibly, the current is acceptable if you have considered the implications on PMU events. >> And why not delegate the others as well? >> (EXC_LOAD_MISALIGNED, EXC_STORE_MISALIGNED, EXC_LOAD_ACCESS, >> EXC_STORE_ACCESS, and EXC_INST_ACCESS.) > > Thanks for the reminder. I will have a test and resend the patch if it wo= rks. The misaligned exceptions are already being worked on, so don't waste your time on them, sorry. 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Mon, 23 Jun 2025 03:04:31 -0700 (PDT) Received: from localhost ([2a02:8308:a00c:e200:8947:973b:de:93b7]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a6d0f19f9esm9077130f8f.39.2025.06.23.03.04.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 Jun 2025 03:04:31 -0700 (PDT) Mime-Version: 1.0 Date: Mon, 23 Jun 2025 12:04:30 +0200 Message-Id: Subject: Re: [External] Re: [PATCH] RISC-V: KVM: Delegate illegal instruction fault Cc: , , , , , , , , , , "linux-riscv" To: "Xu Lu" From: =?utf-8?q?Radim_Kr=C4=8Dm=C3=A1=C5=99?= References: <20250620091720.85633-1-luxu.kernel@bytedance.com> In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250623_030433_186872_56DB5A82 X-CRM114-Status: GOOD ( 18.63 ) 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 MjAyNS0wNi0yMlQxODoxMTo0OSswODowMCwgWHUgTHUgPGx1eHUua2VybmVsQGJ5dGVkYW5jZS5j b20+Ogo+IEhpIFJhZGltLAo+Cj4gT24gRnJpLCBKdW4gMjAsIDIwMjUgYXQgODowNOKAr1BNIFJh ZGltIEtyxI1tw6HFmSA8cmtyY21hckB2ZW50YW5hbWljcm8uY29tPiB3cm90ZToKPj4KPj4gMjAy NS0wNi0yMFQxNzoxNzoyMCswODowMCwgWHUgTHUgPGx1eHUua2VybmVsQGJ5dGVkYW5jZS5jb20+ Ogo+PiA+IERlbGVnYXRlIGlsbGVnYWwgaW5zdHJ1Y3Rpb24gZmF1bHQgdG8gVlMgbW9kZSBpbiBk ZWZhdWx0IHRvIGF2b2lkIHN1Y2gKPj4gPiBleGNlcHRpb25zIGJlaW5nIHRyYXBwZWQgdG8gSFMg YW5kIHJlZGlyZWN0ZWQgYmFjayB0byBWUy4KPj4gPgo+PiA+IFNpZ25lZC1vZmYtYnk6IFh1IEx1 IDxsdXh1Lmtlcm5lbEBieXRlZGFuY2UuY29tPgo+PiA+IC0tLQo+PiA+IGRpZmYgLS1naXQgYS9h cmNoL3Jpc2N2L2luY2x1ZGUvYXNtL2t2bV9ob3N0LmggYi9hcmNoL3Jpc2N2L2luY2x1ZGUvYXNt L2t2bV9ob3N0LmgKPj4gPiBAQCAtNDgsNiArNDgsNyBAQAo+PiA+ICsgICAgICAgICAgICAgICAg ICAgICAgICAgICAgICAgICAgICAgIEJJVChFWENfSU5TVF9JTExFR0FMKSAgICB8IFwKPj4KPj4g WW91IHNob3VsZCBhbHNvIHJlbW92ZSB0aGUgZGVhZCBjb2RlIGluIGt2bV9yaXNjdl92Y3B1X2V4 aXQuCj4KPiBJIG9ubHkgd2FudCB0byBkZWxlZ2F0ZSBpdCBieSBkZWZhdWx0LiBBbmQgS1ZNIG1h eSBzdGlsbCB3YW50IHRvCj4gZGVsZWdhdGUgZGlmZmVyZW50IGV4Y2VwdGlvbnMgZm9yIGRpZmZl cmVudCBWTXMgbGlrZSB3aGF0IGl0IGRvZXMgZm9yCj4gRVhDX0JSRUFLUE9JTlQuCgooSSB0aGlu ayB3ZSBjb3VsZCBlYXNpbHkgcmVpbnRyb2R1Y2UgdGhlIGNvZGUgaWYgS1ZNIHdhbnRzIHRvIGRv IHRoYXQgaW4KIHRoZSBmdXR1cmUuICBJIGFsc28gdGhpbmsgdGhhdCBpdCdzIGJhZCB0aGF0IHRo aXMgcGF0Y2ggaXMgZG9pbmcgYW4KIG9ic2VydmFibGUgY2hhbmdlIHdpdGhvdXQgdXNlcnNwYWNl IGludm9sdmVtZW50IC0tIHRoZSBjb3VudGluZyBvZiBLVk0KIFNCSSBQTVUgZXZlbnRzLCBidXQg b3RoZXJzIHdpbGwgcHJvYmFibHkgZGlzYWdyZWUgd2l0aCBtZSBvbiB0aGlzLikKCj4gICAgICAg ICAgICAgICAgIFNvIG1heWJlIGl0IGlzIGJldHRlciB0byByZXNlcnZlIHRoZXNlIGNvZGVzPwoK UG9zc2libHksIHRoZSBjdXJyZW50IGlzIGFjY2VwdGFibGUgaWYgeW91IGhhdmUgY29uc2lkZXJl ZCB0aGUKaW1wbGljYXRpb25zIG9uIFBNVSBldmVudHMuCgo+PiBBbmQgd2h5IG5vdCBkZWxlZ2F0 ZSB0aGUgb3RoZXJzIGFzIHdlbGw/Cj4+IChFWENfTE9BRF9NSVNBTElHTkVELCBFWENfU1RPUkVf TUlTQUxJR05FRCwgRVhDX0xPQURfQUNDRVNTLAo+PiAgRVhDX1NUT1JFX0FDQ0VTUywgYW5kIEVY Q19JTlNUX0FDQ0VTUy4pCj4KPiBUaGFua3MgZm9yIHRoZSByZW1pbmRlci4gSSB3aWxsIGhhdmUg YSB0ZXN0IGFuZCByZXNlbmQgdGhlIHBhdGNoIGlmIGl0IHdvcmtzLgoKVGhlIG1pc2FsaWduZWQg ZXhjZXB0aW9ucyBhcmUgYWxyZWFkeSBiZWluZyB3b3JrZWQgb24sIHNvIGRvbid0IHdhc3RlCnlv dXIgdGltZSBvbiB0aGVtLCBzb3JyeS4KCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fCmxpbnV4LXJpc2N2IG1haWxpbmcgbGlzdApsaW51eC1yaXNjdkBsaXN0 cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGlu Zm8vbGludXgtcmlzY3YK