From: Paolo Bonzini <pbonzini@redhat.com>
To: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Cc: gleb@kernel.org, mtosatti@redhat.com, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, dmatlack@google.com
Subject: Re: [PATCH v2 10/15] KVM: MTRR: introduce var_mtrr_range
Date: Wed, 17 Jun 2015 17:38:34 +0200 [thread overview]
Message-ID: <5581947A.8080002@redhat.com> (raw)
In-Reply-To: <1434358535-19923-11-git-send-email-guangrong.xiao@linux.intel.com>
On 15/06/2015 10:55, Xiao Guangrong wrote:
> It gets the range for the specified variable MTRR
>
> Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
> ---
> arch/x86/kvm/mtrr.c | 19 +++++++++++++------
> 1 file changed, 13 insertions(+), 6 deletions(-)
>
> diff --git a/arch/x86/kvm/mtrr.c b/arch/x86/kvm/mtrr.c
> index df73149..cb9702d 100644
> --- a/arch/x86/kvm/mtrr.c
> +++ b/arch/x86/kvm/mtrr.c
> @@ -241,10 +241,21 @@ static int fixed_msr_to_range_index(u32 msr)
> return fixed_mtrr_seg_unit_range_index(seg, unit);
> }
>
> +static void var_mtrr_range(struct kvm_mtrr_range *range, u64 *start, u64 *end)
> +{
> + u64 mask;
> +
> + *start = range->base & PAGE_MASK;
> +
> + mask = range->mask & PAGE_MASK;
> + mask |= ~0ULL << boot_cpu_data.x86_phys_bits;
> + *end = ((*start & mask) | ~mask) + 1;
This is just (*start | ~mask) + 1. I will adjust this.
Paolo
> +}
> +
> static void update_mtrr(struct kvm_vcpu *vcpu, u32 msr)
> {
> struct kvm_mtrr *mtrr_state = &vcpu->arch.mtrr_state;
> - gfn_t start, end, mask;
> + gfn_t start, end;
> int index;
>
> if (msr == MSR_IA32_CR_PAT || !tdp_enabled ||
> @@ -264,11 +275,7 @@ static void update_mtrr(struct kvm_vcpu *vcpu, u32 msr)
> } else {
> /* variable range MTRRs. */
> index = (msr - 0x200) / 2;
> - start = mtrr_state->var_ranges[index].base & PAGE_MASK;
> - mask = mtrr_state->var_ranges[index].mask & PAGE_MASK;
> - mask |= ~0ULL << cpuid_maxphyaddr(vcpu);
> -
> - end = ((start & mask) | ~mask) + 1;
> + var_mtrr_range(&mtrr_state->var_ranges[index], &start, &end);
> }
>
> kvm_zap_gfn_range(vcpu->kvm, gpa_to_gfn(start), gpa_to_gfn(end));
>
next prev parent reply other threads:[~2015-06-17 15:38 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-15 8:55 [PATCH v2 00/15] vMTRR bugfix and optimization Xiao Guangrong
2015-06-15 8:55 ` [PATCH v2 01/15] KVM: x86: fix CR0.CD virtualization Xiao Guangrong
2015-06-15 8:55 ` [PATCH v2 02/15] KVM: x86: move MTRR related code to a separate file Xiao Guangrong
2015-06-15 8:55 ` [PATCH v2 03/15] KVM: MTRR: handle MSR_MTRRcap in kvm_mtrr_get_msr Xiao Guangrong
2015-06-15 8:55 ` [PATCH v2 04/15] KVM: MTRR: remove mtrr_state.have_fixed Xiao Guangrong
2015-06-15 8:55 ` [PATCH v2 05/15] KVM: MTRR: exactly define the size of variable MTRRs Xiao Guangrong
2015-06-15 8:55 ` [PATCH v2 06/15] KVM: MTRR: clean up mtrr default type Xiao Guangrong
2015-06-15 8:55 ` [PATCH v2 07/15] KVM: MTRR: do not split 64 bits MSR content Xiao Guangrong
2015-06-15 8:55 ` [PATCH v2 08/15] KVM: MTRR: improve kvm_mtrr_get_guest_memory_type Xiao Guangrong
2015-06-15 8:55 ` [PATCH v2 09/15] KVM: MTRR: introduce fixed_mtrr_segment table Xiao Guangrong
2015-06-15 8:55 ` [PATCH v2 10/15] KVM: MTRR: introduce var_mtrr_range Xiao Guangrong
2015-06-17 15:38 ` Paolo Bonzini [this message]
2015-06-15 8:55 ` [PATCH v2 11/15] KVM: MTRR: sort variable MTRRs Xiao Guangrong
2015-06-17 15:40 ` Paolo Bonzini
2015-06-17 16:11 ` Paolo Bonzini
2015-06-22 11:24 ` Paolo Bonzini
2015-06-22 11:24 ` Paolo Bonzini
2015-06-23 2:29 ` Xiao Guangrong
2015-06-23 2:29 ` Xiao Guangrong
2015-06-23 8:00 ` Paolo Bonzini
2015-06-23 8:27 ` Xiao Guangrong
2015-06-15 8:55 ` [PATCH v2 12/15] KVM: MTRR: introduce fixed_mtrr_addr_* functions Xiao Guangrong
2015-06-15 8:55 ` [PATCH v2 13/15] KVM: MTRR: introduce mtrr_for_each_mem_type Xiao Guangrong
2015-06-15 8:55 ` [PATCH v2 14/15] KVM: MTRR: simplify kvm_mtrr_get_guest_memory_type Xiao Guangrong
2015-06-15 8:55 ` [PATCH v2 15/15] KVM: MTRR: do not map huage page for non-consistent range Xiao Guangrong
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