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From: Huacai Chen <chenhc@lemote.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
Cc: kvm@vger.kernel.org, linux-mips@vger.kernel.org,
	Fuxin Zhang <zhangfx@lemote.com>,
	Huacai Chen <chenhuacai@gmail.com>,
	Jiaxun Yang <jiaxun.yang@flygoat.com>,
	Huacai Chen <chenhc@lemote.com>
Subject: [PATCH V6 07/15] KVM: MIPS: Use root tlb to control guest's CCA for Loongson-3
Date: Sun, 17 May 2020 12:06:04 +0800	[thread overview]
Message-ID: <1589688372-3098-8-git-send-email-chenhc@lemote.com> (raw)
In-Reply-To: <1589688372-3098-1-git-send-email-chenhc@lemote.com>

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.

Reviewed-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Co-developed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
---
 arch/mips/kvm/vz.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/mips/kvm/vz.c b/arch/mips/kvm/vz.c
index 422cd06..f9fbbc16 100644
--- a/arch/mips/kvm/vz.c
+++ b/arch/mips/kvm/vz.c
@@ -2871,6 +2871,12 @@ static int kvm_vz_hardware_enable(void)
 	if (cpu_has_guestctl2)
 		clear_c0_guestctl2(0x3f << 10);
 
+#ifdef CONFIG_CPU_LOONGSON64
+	/* Control guest CCA attribute */
+	if (cpu_has_csr())
+		csr_writel(csr_readl(0xffffffec) | 0x1, 0xffffffec);
+#endif
+
 	return 0;
 }
 
-- 
2.7.0


  parent reply	other threads:[~2020-05-17  4:08 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-17  4:05 [PATCH V6 00/15] KVM: MIPS: Add Loongson-3 support (Host Side) Huacai Chen
2020-05-17  4:05 ` [PATCH V6 01/15] KVM: MIPS: Define KVM_ENTRYHI_ASID to cpu_asid_mask(&boot_cpu_data) Huacai Chen
2020-05-19 11:49   ` Sasha Levin
2020-05-17  4:05 ` [PATCH V6 02/15] KVM: MIPS: Fix VPN2_MASK definition for variable cpu_vmbits Huacai Chen
2020-05-17  4:06 ` [PATCH V6 03/15] KVM: MIPS: Increase KVM_MAX_VCPUS and KVM_USER_MEM_SLOTS to 16 Huacai Chen
2020-05-17  4:06 ` [PATCH V6 04/15] KVM: MIPS: Add EVENTFD support which is needed by VHOST Huacai Chen
2020-05-17  4:06 ` [PATCH V6 05/15] KVM: MIPS: Use lddir/ldpte instructions to lookup gpa_mm.pgd Huacai Chen
2020-05-17  4:06 ` [PATCH V6 06/15] KVM: MIPS: Introduce and use cpu_guest_has_ldpte Huacai Chen
2020-05-17  4:06 ` Huacai Chen [this message]
2020-05-17  4:06 ` [PATCH V6 08/15] KVM: MIPS: Let indexed cacheops cause guest exit on Loongson-3 Huacai Chen
2020-05-17  4:06 ` [PATCH V6 09/15] KVM: MIPS: Add more types of virtual interrupts Huacai Chen
2020-05-17  4:06 ` [PATCH V6 10/15] KVM: MIPS: Add Loongson-3 Virtual IPI interrupt support Huacai Chen
2020-05-17  4:06 ` [PATCH V6 11/15] KVM: MIPS: Add CPUCFG emulation for Loongson-3 Huacai Chen
2020-05-17  4:06 ` [PATCH V6 12/15] KVM: MIPS: Add CONFIG6 and DIAG registers emulation Huacai Chen
2020-05-17  4:06 ` [PATCH V6 13/15] KVM: MIPS: Add more MMIO load/store instructions emulation Huacai Chen
2020-05-17  4:06 ` [PATCH V6 14/15] KVM: MIPS: Enable KVM support for Loongson-3 Huacai Chen
2020-05-17  4:06 ` [PATCH V6 15/15] MAINTAINERS: Update KVM/MIPS maintainers Huacai Chen
2020-05-17  8:22   ` Thomas Bogendoerfer
2020-05-18  8:23     ` Aleksandar Markovic
2020-05-21  9:22       ` Aleksandar Markovic
2020-05-21  9:45         ` Huacai Chen
2020-05-21 11:04           ` Aleksandar Markovic
2020-05-21 14:04             ` Paolo Bonzini
2020-05-22  5:34               ` Huacai Chen
2020-05-22  7:24                 ` Paolo Bonzini
2020-05-22 12:16                   ` 毛碧波
2020-05-23  2:35                     ` Huacai Chen

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