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KVM: MIPS: Use root tlb to control guest's CCA for Loongson-3

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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>
Message-Id: <1590220602-3547-8-git-send-email-chenhc@lemote.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Huacai Chen 2020-05-23 15:56:34 +08:00 committed by Paolo Bonzini
parent 3210e2c279
commit 52c07e1cbb
1 changed files with 6 additions and 0 deletions
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6
arch/mips/kvm/vz.c
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@ -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;
}