From 64ebc9e24074403c4127b06c0203f3e7b3367e69 Mon Sep 17 00:00:00 2001 From: James Hogan Date: Tue, 13 Dec 2016 13:02:36 +0000 Subject: KVM: MIPS/T&E: Handle read only GPA in TLB mod MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Rewrite TLB modified exception handling to handle read only GPA memory regions, instead of unconditionally passing the exception to the guest. If the guest TLB is not the cause of the exception we call into the normal TLB fault handling depending on the memory segment, which will soon attempt to remap the physical page to be writable (handling dirty page tracking or copy on write in the process). Failing that we fall back to treating it as MMIO, due to a read only memory region. Once the capability is enabled, this will allow read only memory regions (such as the Malta boot flash as emulated by QEMU) to have writes treated as MMIO, while still allowing reads to run untrapped. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Ralf Baechle Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org --- arch/mips/include/asm/kvm_host.h | 5 ----- 1 file changed, 5 deletions(-) (limited to 'arch/mips/include') diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h index 17db9d6c7c93..13c9e128bb86 100644 --- a/arch/mips/include/asm/kvm_host.h +++ b/arch/mips/include/asm/kvm_host.h @@ -614,11 +614,6 @@ extern enum emulation_result kvm_mips_handle_tlbmiss(u32 cause, struct kvm_vcpu *vcpu, bool write_fault); -extern enum emulation_result kvm_mips_handle_tlbmod(u32 cause, - u32 *opc, - struct kvm_run *run, - struct kvm_vcpu *vcpu); - extern void kvm_mips_dump_host_tlbs(void); extern void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu); extern int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long entryhi, -- cgit v1.2.3