[pve-devel] applied: [PATCH kernel] fix #2008: kvm: x86: Add AMD's EX_CFG to the list of ignored MSRs

[Thomas Lamprecht]

Am 4/16/19 um 6:05 PM schrieb Thomas Lamprecht:
> clean backport from kernel mainline commit
> 0e1b869fff60c81b510c2d00602d778f8f59dd9a  [0]
> 
> Without this a Windows ISO doesn't even comes to the first dialog,
> and BSODs quite quickly (boot loops then), with this I get to the
> installer dialog, and everything seems to be fine..
> 
> [0]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0e1b869fff60c81b510c2d00602d778f8f59dd9a
> 
> Signed-off-by: Thomas Lamprecht <t.lamprecht at proxmox.com>
> ---
> 
>  ...s-EX_CFG-to-the-list-of-ignored-MSRs.patch | 55 +++++++++++++++++++
>  1 file changed, 55 insertions(+)
>  create mode 100644 patches/kernel/0008-kvm-x86-Add-AMD-s-EX_CFG-to-the-list-of-ignored-MSRs.patch
> 
> diff --git a/patches/kernel/0008-kvm-x86-Add-AMD-s-EX_CFG-to-the-list-of-ignored-MSRs.patch b/patches/kernel/0008-kvm-x86-Add-AMD-s-EX_CFG-to-the-list-of-ignored-MSRs.patch
> new file mode 100644
> index 0000000..2d04fea
> --- /dev/null
> +++ b/patches/kernel/0008-kvm-x86-Add-AMD-s-EX_CFG-to-the-list-of-ignored-MSRs.patch
> @@ -0,0 +1,55 @@
> +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
> +From: Eduardo Habkost <ehabkost at redhat.com>
> +Date: Mon, 17 Dec 2018 22:34:18 -0200
> +Subject: [PATCH] kvm: x86: Add AMD's EX_CFG to the list of ignored MSRs
> +
> +Some guests OSes (including Windows 10) write to MSR 0xc001102c
> +on some cases (possibly while trying to apply a CPU errata).
> +Make KVM ignore reads and writes to that MSR, so the guest won't
> +crash.
> +
> +The MSR is documented as "Execution Unit Configuration (EX_CFG)",
> +at AMD's "BIOS and Kernel Developer's Guide (BKDG) for AMD Family
> +15h Models 00h-0Fh Processors".
> +
> +Cc: stable at vger.kernel.org
> +Signed-off-by: Eduardo Habkost <ehabkost at redhat.com>
> +Signed-off-by: Paolo Bonzini <pbonzini at redhat.com>
> +Signed-off-by: Thomas Lamprecht <t.lamprecht at proxmox.com>
> +---
> + arch/x86/include/asm/msr-index.h | 1 +
> + arch/x86/kvm/x86.c               | 2 ++
> + 2 files changed, 3 insertions(+)
> +
> +diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
> +index c8f73efb4ece..9e39cc8bd989 100644
> +--- a/arch/x86/include/asm/msr-index.h
> ++++ b/arch/x86/include/asm/msr-index.h
> +@@ -390,6 +390,7 @@
> + #define MSR_F15H_NB_PERF_CTR		0xc0010241
> + #define MSR_F15H_PTSC			0xc0010280
> + #define MSR_F15H_IC_CFG			0xc0011021
> ++#define MSR_F15H_EX_CFG			0xc001102c
> + 
> + /* Fam 10h MSRs */
> + #define MSR_FAM10H_MMIO_CONF_BASE	0xc0010058
> +diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> +index 477563e7ccbd..f049ecfac7bb 100644
> +--- a/arch/x86/kvm/x86.c
> ++++ b/arch/x86/kvm/x86.c
> +@@ -2426,6 +2426,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
> + 	case MSR_AMD64_PATCH_LOADER:
> + 	case MSR_AMD64_BU_CFG2:
> + 	case MSR_AMD64_DC_CFG:
> ++	case MSR_F15H_EX_CFG:
> + 		break;
> + 
> + 	case MSR_IA32_UCODE_REV:
> +@@ -2721,6 +2722,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
> + 	case MSR_AMD64_BU_CFG2:
> + 	case MSR_IA32_PERF_CTL:
> + 	case MSR_AMD64_DC_CFG:
> ++	case MSR_F15H_EX_CFG:
> + 		msr_info->data = 0;
> + 		break;
> + 	case MSR_F15H_PERF_CTL0 ... MSR_F15H_PERF_CTR5:
>