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KVM: MIPS/VZ: Emulate MAARs when necessary

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Add emulation of Memory Accessibility Attribute Registers (MAARs) when
necessary. We can't actually do anything with whatever the guest
provides, but it may not be possible to clear Guest.Config5.MRP so we
have to emulate at least a pair of MAARs.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Cc: linux-doc@vger.kernel.org
This commit is contained in:
James Hogan
2017-03-14 10:15:38 +00:00
parent 273819a6a5
commit d42a008f86
5 changed files with 137 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
arch/mips/include/asm/kvm_host.h
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@@ -67,6 +67,7 @@
#define KVM_REG_MIPS_CP0_CONFIG4 MIPS_CP0_32(16, 4)
#define KVM_REG_MIPS_CP0_CONFIG5 MIPS_CP0_32(16, 5)
#define KVM_REG_MIPS_CP0_CONFIG7 MIPS_CP0_32(16, 7)
#define KVM_REG_MIPS_CP0_MAARI MIPS_CP0_64(17, 2)
#define KVM_REG_MIPS_CP0_XCONTEXT MIPS_CP0_64(20, 0)
#define KVM_REG_MIPS_CP0_ERROREPC MIPS_CP0_64(30, 0)
#define KVM_REG_MIPS_CP0_KSCRATCH1 MIPS_CP0_64(31, 2)
@@ -388,6 +389,9 @@ struct kvm_vcpu_arch {
struct kvm_mips_tlb *wired_tlb;
unsigned int wired_tlb_limit;
unsigned int wired_tlb_used;
/* emulated guest MAAR registers */
unsigned long maar[6];
#endif
/* Last CPU the VCPU state was loaded on */
@@ -708,6 +712,7 @@ __BUILD_KVM_RW_HW(config4, 32, MIPS_CP0_CONFIG, 4)
__BUILD_KVM_RW_HW(config5, 32, MIPS_CP0_CONFIG, 5)
__BUILD_KVM_RW_HW(config6, 32, MIPS_CP0_CONFIG, 6)
__BUILD_KVM_RW_HW(config7, 32, MIPS_CP0_CONFIG, 7)
__BUILD_KVM_RW_SW(maari, l, MIPS_CP0_LLADDR, 2)
__BUILD_KVM_RW_HW(xcontext, l, MIPS_CP0_TLB_XCONTEXT, 0)
__BUILD_KVM_RW_HW(errorepc, l, MIPS_CP0_ERROR_PC, 0)
__BUILD_KVM_RW_HW(kscratch1, l, MIPS_CP0_DESAVE, 2)