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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 V7 14/15] KVM: MIPS: Enable KVM support for Loongson-3
Date: Sat, 23 May 2020 15:56:41 +0800
Message-ID: <1590220602-3547-15-git-send-email-chenhc@lemote.com> (raw)
In-Reply-To: <1590220602-3547-1-git-send-email-chenhc@lemote.com>

This patch enable KVM support for Loongson-3 by selecting HAVE_KVM, but
only enable KVM/VZ on Loongson-3A R4+ (because VZ of early processors
are incomplete). Besides, Loongson-3 support SMP guests, so we clear the
linked load bit of LLAddr in kvm_vz_vcpu_load() if the guest has more
than one VCPUs.

Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
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/Kconfig            | 1 +
 arch/mips/kernel/cpu-probe.c | 1 +
 arch/mips/kvm/vz.c           | 2 +-
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index ce1aacc..3a15f2b 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1405,6 +1405,7 @@ config CPU_LOONGSON64
 	select MIPS_L1_CACHE_SHIFT_6
 	select GPIOLIB
 	select SWIOTLB
+	select HAVE_KVM
 	help
 		The Loongson GSx64(GS264/GS464/GS464E/GS464V) series of processor
 		cores implements the MIPS64R2 instruction set with many extensions,
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 319c250..415fbd2 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -2008,6 +2008,7 @@ static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu)
 		c->writecombine = _CACHE_UNCACHED_ACCELERATED;
 		c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM |
 			MIPS_ASE_LOONGSON_EXT | MIPS_ASE_LOONGSON_EXT2);
+		c->ases &= ~MIPS_ASE_VZ; /* VZ of Loongson-3A2000/3000 is incomplete */
 		break;
 	case PRID_IMP_LOONGSON_64G:
 		c->cputype = CPU_LOONGSON64;
diff --git a/arch/mips/kvm/vz.c b/arch/mips/kvm/vz.c
index 73701c3..dc753d0 100644
--- a/arch/mips/kvm/vz.c
+++ b/arch/mips/kvm/vz.c
@@ -2697,7 +2697,7 @@ static int kvm_vz_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 	 * prevents a SC on the next VCPU from succeeding by matching a LL on
 	 * the previous VCPU.
 	 */
-	if (cpu_guest_has_rw_llb)
+	if (vcpu->kvm->created_vcpus > 1)
 		write_gc0_lladdr(0);
 
 	return 0;
-- 
2.7.0


  parent reply index

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-23  7:56 [PATCH V7 00/15] KVM: MIPS: Add Loongson-3 support (Host Side) Huacai Chen
2020-05-23  7:56 ` [PATCH V7 01/15] KVM: MIPS: Define KVM_ENTRYHI_ASID to cpu_asid_mask(&boot_cpu_data) Huacai Chen
2020-05-23  7:56 ` [PATCH V7 02/15] KVM: MIPS: Fix VPN2_MASK definition for variable cpu_vmbits Huacai Chen
2020-05-23  7:56 ` [PATCH V7 03/15] KVM: MIPS: Increase KVM_MAX_VCPUS and KVM_USER_MEM_SLOTS to 16 Huacai Chen
2020-05-23  7:56 ` [PATCH V7 04/15] KVM: MIPS: Add EVENTFD support which is needed by VHOST Huacai Chen
2020-05-23  7:56 ` [PATCH V7 05/15] KVM: MIPS: Use lddir/ldpte instructions to lookup gpa_mm.pgd Huacai Chen
2020-05-23  7:56 ` [PATCH V7 06/15] KVM: MIPS: Introduce and use cpu_guest_has_ldpte Huacai Chen
2020-05-23  7:56 ` [PATCH V7 07/15] KVM: MIPS: Use root tlb to control guest's CCA for Loongson-3 Huacai Chen
2020-05-23  7:56 ` [PATCH V7 08/15] KVM: MIPS: Let indexed cacheops cause guest exit on Loongson-3 Huacai Chen
2020-05-23  7:56 ` [PATCH V7 09/15] KVM: MIPS: Add more types of virtual interrupts Huacai Chen
2020-05-23  7:56 ` [PATCH V7 10/15] KVM: MIPS: Add Loongson-3 Virtual IPI interrupt support Huacai Chen
2020-05-23  7:56 ` [PATCH V7 11/15] KVM: MIPS: Add CPUCFG emulation for Loongson-3 Huacai Chen
2020-05-23  7:56 ` [PATCH V7 12/15] KVM: MIPS: Add CONFIG6 and DIAG registers emulation Huacai Chen
2020-05-23 13:27   ` WANG Xuerui
     [not found]     ` <CAHiYmc6YDw7=mqXfMdgSfeR-HVd2Ec+sQVquM=Z6jLke2s-VEw@mail.gmail.com>
2020-05-24  2:45       ` Huacai Chen
2020-05-23  7:56 ` [PATCH V7 13/15] KVM: MIPS: Add more MMIO load/store instructions emulation Huacai Chen
2020-05-23  7:56 ` Huacai Chen [this message]
2020-05-23  7:56 ` [PATCH V7 15/15] MAINTAINERS: Update KVM/MIPS maintainers Huacai Chen
2020-05-23  9:01 ` [PATCH V7 00/15] KVM: MIPS: Add Loongson-3 support (Host Side) Aleksandar Markovic

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