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MIPS: KVM: Add KScratch registers

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Allow up to 6 KVM guest KScratch registers to be enabled and accessed
via the KVM guest register API and from the guest itself (the fallback
reading and writing of commpage registers is sufficient for KScratch
registers to work as expected).

User mode can expose the registers by setting the appropriate bits of
the guest Config4.KScrExist field. KScratch registers that aren't usable
won't be writeable via the KVM Ioctl API.

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: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
James Hogan
2016-06-15 19:29:56 +01:00
committed by Paolo Bonzini
parent cf1fb0f29d
commit 0510870952
6 changed files with 110 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
arch/mips/include/asm/kvm_host.h
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@@ -56,6 +56,12 @@
#define KVM_REG_MIPS_CP0_CONFIG7 MIPS_CP0_32(16, 7)
#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)
#define KVM_REG_MIPS_CP0_KSCRATCH2 MIPS_CP0_64(31, 3)
#define KVM_REG_MIPS_CP0_KSCRATCH3 MIPS_CP0_64(31, 4)
#define KVM_REG_MIPS_CP0_KSCRATCH4 MIPS_CP0_64(31, 5)
#define KVM_REG_MIPS_CP0_KSCRATCH5 MIPS_CP0_64(31, 6)
#define KVM_REG_MIPS_CP0_KSCRATCH6 MIPS_CP0_64(31, 7)
#define KVM_MAX_VCPUS 1
@@ -376,6 +382,7 @@ struct kvm_vcpu_arch {
u8 fpu_enabled;
u8 msa_enabled;
u8 kscratch_enabled;
};
@@ -429,6 +436,18 @@ struct kvm_vcpu_arch {
#define kvm_write_c0_guest_config7(cop0, val) (cop0->reg[MIPS_CP0_CONFIG][7] = (val))
#define kvm_read_c0_guest_errorepc(cop0) (cop0->reg[MIPS_CP0_ERROR_PC][0])
#define kvm_write_c0_guest_errorepc(cop0, val) (cop0->reg[MIPS_CP0_ERROR_PC][0] = (val))
#define kvm_read_c0_guest_kscratch1(cop0) (cop0->reg[MIPS_CP0_DESAVE][2])
#define kvm_read_c0_guest_kscratch2(cop0) (cop0->reg[MIPS_CP0_DESAVE][3])
#define kvm_read_c0_guest_kscratch3(cop0) (cop0->reg[MIPS_CP0_DESAVE][4])
#define kvm_read_c0_guest_kscratch4(cop0) (cop0->reg[MIPS_CP0_DESAVE][5])
#define kvm_read_c0_guest_kscratch5(cop0) (cop0->reg[MIPS_CP0_DESAVE][6])
#define kvm_read_c0_guest_kscratch6(cop0) (cop0->reg[MIPS_CP0_DESAVE][7])
#define kvm_write_c0_guest_kscratch1(cop0, val) (cop0->reg[MIPS_CP0_DESAVE][2] = (val))
#define kvm_write_c0_guest_kscratch2(cop0, val) (cop0->reg[MIPS_CP0_DESAVE][3] = (val))
#define kvm_write_c0_guest_kscratch3(cop0, val) (cop0->reg[MIPS_CP0_DESAVE][4] = (val))
#define kvm_write_c0_guest_kscratch4(cop0, val) (cop0->reg[MIPS_CP0_DESAVE][5] = (val))
#define kvm_write_c0_guest_kscratch5(cop0, val) (cop0->reg[MIPS_CP0_DESAVE][6] = (val))
#define kvm_write_c0_guest_kscratch6(cop0, val) (cop0->reg[MIPS_CP0_DESAVE][7] = (val))
/*
* Some of the guest registers may be modified asynchronously (e.g. from a