Message ID | 20230207095529.1787260-5-atishp@rivosinc.com |
---|---|
State | Accepted |
Headers | show
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Tue, 07 Feb 2023 01:56:31 -0800 (PST) From: Atish Patra <atishp@rivosinc.com> To: linux-kernel@vger.kernel.org Cc: Atish Patra <atishp@rivosinc.com>, Andrew Jones <ajones@ventanamicro.com>, Anup Patel <anup@brainfault.org>, Atish Patra <atishp@atishpatra.org>, kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-riscv@lists.infradead.org, Palmer Dabbelt <palmer@dabbelt.com>, Paul Walmsley <paul.walmsley@sifive.com> Subject: [PATCH v6 4/8] RISC-V: KVM: Disable all hpmcounter access for VS/VU mode Date: Tue, 7 Feb 2023 01:55:25 -0800 Message-Id: <20230207095529.1787260-5-atishp@rivosinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230207095529.1787260-1-atishp@rivosinc.com> References: <20230207095529.1787260-1-atishp@rivosinc.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230207_015633_129601_16EA4A6F X-CRM114-Status: UNSURE ( 9.85 ) X-CRM114-Notice: Please train this message. X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "bombadil.infradead.org", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Any guest must not get access to any hpmcounter including cycle/instret without any checks. We achieve that by disabling all the bits except TM bit in hcounteren. However, instret and cycle access for guest user space can be enabled upon explicit request (via ONE REG) or on first trap from VU mode to maintain ABI requirement in the future. 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KVM perf support
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diff --git a/arch/riscv/kvm/main.c b/arch/riscv/kvm/main.c index 58c5489..c5d400f 100644 --- a/arch/riscv/kvm/main.c +++ b/arch/riscv/kvm/main.c @@ -49,7 +49,8 @@ int kvm_arch_hardware_enable(void) hideleg |= (1UL << IRQ_VS_EXT); csr_write(CSR_HIDELEG, hideleg); - csr_write(CSR_HCOUNTEREN, -1UL); + /* VS should access only the time counter directly. Everything else should trap */ + csr_write(CSR_HCOUNTEREN, 0x02); csr_write(CSR_HVIP, 0);