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Commit 455716fa authored by Joerg Roedel's avatar Joerg Roedel Committed by Avi Kivity
Browse files

KVM: SVM: Move msrpm offset calculation to seperate function 



The algorithm to find the offset in the msrpm for a given
msr is needed at other places too. Move that logic to its
own function.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent d2477826

arch/x86/kvm/svm.c

+37 −16
Original line number Diff line number Diff line
@@ -117,6 +117,8 @@ struct vcpu_svm { 
	unsigned long int3_rip;

};



#define MSR_INVALID			0xffffffffU



/* enable NPT for AMD64 and X86 with PAE */

#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)

static bool npt_enabled = true;
@@ -200,6 +202,27 @@ static u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000}; 
#define MSRS_RANGE_SIZE 2048

#define MSRS_IN_RANGE (MSRS_RANGE_SIZE * 8 / 2)



static u32 svm_msrpm_offset(u32 msr)

{

	u32 offset;

	int i;



	for (i = 0; i < NUM_MSR_MAPS; i++) {

		if (msr < msrpm_ranges[i] ||

		    msr >= msrpm_ranges[i] + MSRS_IN_RANGE)

			continue;



		offset  = (msr - msrpm_ranges[i]) / 4; /* 4 msrs per u8 */

		offset += (i * MSRS_RANGE_SIZE);       /* add range offset */



		/* Now we have the u8 offset - but need the u32 offset */

		return offset / 4;

	}



	/* MSR not in any range */

	return MSR_INVALID;

}



#define MAX_INST_SIZE 15



static inline u32 svm_has(u32 feat)
@@ -418,23 +441,21 @@ static int svm_cpu_init(int cpu) 
static void set_msr_interception(u32 *msrpm, unsigned msr,

				 int read, int write)

{

	int i;

	u8 bit_read, bit_write;

	unsigned long tmp;

	u32 offset;



	for (i = 0; i < NUM_MSR_MAPS; i++) {

		if (msr >= msrpm_ranges[i] &&

		    msr < msrpm_ranges[i] + MSRS_IN_RANGE) {

			u32 msr_offset = (i * MSRS_IN_RANGE + msr -

					  msrpm_ranges[i]) * 2;



			u32 *base = msrpm + (msr_offset / 32);

			u32 msr_shift = msr_offset % 32;

			u32 mask = ((write) ? 0 : 2) | ((read) ? 0 : 1);

			*base = (*base & ~(0x3 << msr_shift)) |

				(mask << msr_shift);

			return;

		}

	}

	BUG();

	offset    = svm_msrpm_offset(msr);

	bit_read  = 2 * (msr & 0x0f);

	bit_write = 2 * (msr & 0x0f) + 1;

	tmp       = msrpm[offset];



	BUG_ON(offset == MSR_INVALID);



	read  ? clear_bit(bit_read,  &tmp) : set_bit(bit_read,  &tmp);

	write ? clear_bit(bit_write, &tmp) : set_bit(bit_write, &tmp);



	msrpm[offset] = tmp;

}



static void svm_vcpu_init_msrpm(u32 *msrpm)