From ba28efb242341c35da30251943c352b6e00bf425 Mon Sep 17 00:00:00 2001 From: Roger Pau Monne Date: Mon, 17 Aug 2020 17:57:53 +0200 Subject: [PATCH] x86/pv: handle reads to the PAT MSR MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The value in the PAT MSR is part of the ABI between Xen and PV guests, and there's no reason to not allow a PV guest to read it. Signed-off-by: Roger Pau Monné Acked-by: Andrew Cooper --- xen/arch/x86/pv/emul-priv-op.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/xen/arch/x86/pv/emul-priv-op.c b/xen/arch/x86/pv/emul-priv-op.c index d1d16b4806..971ba9e58c 100644 --- a/xen/arch/x86/pv/emul-priv-op.c +++ b/xen/arch/x86/pv/emul-priv-op.c @@ -900,6 +900,10 @@ static int read_msr(unsigned int reg, uint64_t *val, *val = guest_efer(currd); return X86EMUL_OKAY; + case MSR_IA32_CR_PAT: + *val = XEN_MSR_PAT; + return X86EMUL_OKAY; + case MSR_K7_FID_VID_CTL: case MSR_K7_FID_VID_STATUS: case MSR_K8_PSTATE_LIMIT: -- 2.39.5