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Commit b0a94d4e authored by Paul Mackerras's avatar Paul Mackerras Committed by Alexander Graf
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KVM: PPC: Book3S PR: Emulate PURR, SPURR and DSCR registers 



This adds basic emulation of the PURR and SPURR registers.  We assume
we are emulating a single-threaded core, so these advance at the same
rate as the timebase.  A Linux kernel running on a POWER7 expects to
be able to access these registers and is not prepared to handle a
program interrupt on accessing them.

This also adds a very minimal emulation of the DSCR (data stream
control register).  Writes are ignored and reads return zero.

Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
parent 1cc8ed0b

arch/powerpc/include/asm/kvm_book3s.h

+2 −0
Original line number Diff line number Diff line
@@ -81,6 +81,8 @@ struct kvmppc_vcpu_book3s { 
	u64 sdr1;

	u64 hior;

	u64 msr_mask;

	u64 purr_offset;

	u64 spurr_offset;

#ifdef CONFIG_PPC_BOOK3S_32

	u32 vsid_pool[VSID_POOL_SIZE];

	u32 vsid_next;

arch/powerpc/kvm/book3s_emulate.c

+15 −1
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
#include <asm/kvm_book3s.h>

#include <asm/reg.h>

#include <asm/switch_to.h>

#include <asm/time.h>



#define OP_19_XOP_RFID		18

#define OP_19_XOP_RFI		50
@@ -395,6 +396,12 @@ int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val) 
		    (mfmsr() & MSR_HV))

			vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;

		break;

	case SPRN_PURR:

		to_book3s(vcpu)->purr_offset = spr_val - get_tb();

		break;

	case SPRN_SPURR:

		to_book3s(vcpu)->spurr_offset = spr_val - get_tb();

		break;

	case SPRN_GQR0:

	case SPRN_GQR1:

	case SPRN_GQR2:
@@ -412,6 +419,7 @@ int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val) 
	case SPRN_CTRLF:

	case SPRN_CTRLT:

	case SPRN_L2CR:

	case SPRN_DSCR:

	case SPRN_MMCR0_GEKKO:

	case SPRN_MMCR1_GEKKO:

	case SPRN_PMC1_GEKKO:
@@ -483,9 +491,15 @@ int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val) 
		*spr_val = to_book3s(vcpu)->hid[5];

		break;

	case SPRN_CFAR:

	case SPRN_PURR:

	case SPRN_DSCR:

		*spr_val = 0;

		break;

	case SPRN_PURR:

		*spr_val = get_tb() + to_book3s(vcpu)->purr_offset;

		break;

	case SPRN_SPURR:

		*spr_val = get_tb() + to_book3s(vcpu)->purr_offset;

		break;

	case SPRN_GQR0:

	case SPRN_GQR1:

	case SPRN_GQR2: