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[34.92.144.28]) by smtp.gmail.com with ESMTPSA id u8sm7241341pgl.19.2020.04.13.00.25.43 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 13 Apr 2020 00:25:45 -0700 (PDT) From: Huacai Chen To: Paolo Bonzini , Thomas Bogendoerfer Subject: [PATCH 08/15] KVM: MIPS: Use root tlb to control guest's CCA for Loongson-3 Date: Mon, 13 Apr 2020 15:30:17 +0800 Message-Id: <1586763024-12197-9-git-send-email-chenhc@lemote.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1586763024-12197-1-git-send-email-chenhc@lemote.com> References: <1586763024-12197-1-git-send-email-chenhc@lemote.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::641 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvm@vger.kernel.org, Huacai Chen , qemu-devel@nongnu.org, Jiaxun Yang , linux-mips@vger.kernel.org, Fuxin Zhang , Huacai Chen Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" KVM guest has two levels of address translation: guest tlb translates GVA to GPA, and root tlb translates GPA to HPA. By default guest's CCA is controlled by guest tlb, but Loongson-3 maintains all cache coherency by hardware (including multi-core coherency and I/O DMA coherency) so it prefers all guest mappings be cacheable mappings. Thus, we use root tlb to control guest's CCA for Loongson-3. Signed-off-by: Huacai Chen Co-developed-by: Jiaxun Yang --- arch/mips/kvm/vz.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/mips/kvm/vz.c b/arch/mips/kvm/vz.c index 422cd06..e30ebb2 100644 --- a/arch/mips/kvm/vz.c +++ b/arch/mips/kvm/vz.c @@ -2871,6 +2871,10 @@ static int kvm_vz_hardware_enable(void) if (cpu_has_guestctl2) clear_c0_guestctl2(0x3f << 10); + /* Control guest CCA attribute */ + if (cpu_has_csr()) + csr_writel(csr_readl(0xffffffec) | 0x1, 0xffffffec); + return 0; } -- 2.7.0